2011–2014
First generation
Early turbo and fuel-system configuration.
Technical libraryField manual
2011–current · generation overview
Ford 6.7 Power Stroke
Diagnostic manual
Clean fuel, strong cranking, verified supply and rail-pressure tracking.
Common reference specifications: These are common reference specifications. Always look up the current OEM procedure and specifications for your exact vehicle, VIN/engine serial number and installed hardware before performing repairs. Model year, engine revisions and replacement parts can change the requirements. For aftermarket fasteners, follow the current instructions for the exact kit and lubricant. Never loosen a common-rail line while cranking or running, reach for a suspected pressure leak, bypass safety controls, or work under an unsupported vehicle.
Pick the hardware first
Which version is in the truck?
Save a full vehicle scan and inspect fuel first. Contamination, supply loss, rail leakage and air-path faults overlap—and carry very different repair bills.
2015–2019
Second generation
Revised turbo and supply sensing.
2020–2022
Third generation
Updated controls and procedures.
2023+
Current / High Output
Select output and VIN-specific service data.
Find your test
Numerical coverage is limited to the applications shown in the selector. The generation overview is not a claim of complete model-year coverage. Mechanical procedures have a separate search below.
Measured pass / fail data
Numbers before parts
Read the application and test condition on each value; mixed-year chapters still require selecting the correct labeled step. These are field-diagnostic references, not permission to reuse a specification on a different pump, injector, calibration or model year.
System / testTargetTest conditionApplies to
Crank / no-start
Rail pressure to start
Target
About 5,000 psi (34.5 MPa)
Test condition
Watch actual rail pressure through cranking
Applies to
2011–2016 reference
Low-pressure supply
Delivery switch threshold
Target
365 kPa / 53 psi
Test condition
Switch opens at or above threshold
Applies to
2011–2014
Low-pressure supply
Injector return backpressure
Target
≥3 bar / approximately 44–45 psi
Test condition
During crank and normal operation with calibrated return restriction intact
Applies to
2011–2016
Pressure control
Actual-to-desired deviation
Target
Within ±300 psi
Test condition
Warm stable idle
Applies to
2011–2016 reference
Injector return
Comparative leakage screen
Target
3 mL / 15 s — not an OEM rejection limit
Test condition
Cranking or idle with regulated adapter; use Ford procedure for diagnosis
Applies to
2011–2016 field comparison borrowed from GM LML
Temperature plausibility
ECT vs ambient
Target
Within 5°F
Test condition
Cold-soaked engine before start
Applies to
2011–2016 reference
MAF plausibility
MAF frequency
Target
3.5–3.8 kHz idle; 5.9–6.2 kHz at 2,000 RPM
Test condition
EGR and turbo disconnected/closed as specified by the diagnostic
Applies to
2011–2016 reference
Sensor circuit
5 V reference
Target
Approximately 5 V
Test condition
KOEO at the disconnected sensor harness
Applies to
All; verify exact circuit diagram
Unit check: 1 MPa ≈ 145 psi; 100 kPa ≈ 14.5 psi. Keep the scan tool’s displayed unit visible when recording data.
Service-data rule: confirm assembly torque and any test that opens or blocks a high-pressure circuit against current VIN/ESN-specific OEM information.
Manual contents
Choose the complaint or system
Each chapter is a test path. Open it, perform the checks in order, and let the result—not the most expensive part—decide the next move.
01Preliminary checksStart here before clearing codes or opening the fuel system.
1
Test
Verify the complaint
Record cold/hot, ambient temperature, fuel level, recent repairs and exactly when the fault occurs. Duplicate it without clearing anything.
If it passes
The failure is repeatable and its operating conditions are documented.
If it fails
Intermittent complaint: inspect history, connectors and freeze-frame before a road test with recording enabled.
2
Test
Save the evidence
Run a complete module scan. Save active, pending and history codes, freeze-frame, monitor status and a short cranking or drive log.
If it passes
Codes and data agree with the complaint.
If it fails
Conflicting or communication codes: stabilize system voltage and diagnose network/power faults first.
3
Test
Inspect fluids and air path
Sample fuel in a clean clear container. Check oil level and odor, coolant, air filter, intake plumbing and visible harness damage.
If it passes
Fuel is clean, oil is not diluted, coolant is stable and the intake is open.
If it fails
Stop for wrong fuel, water, DEF, metal, fuel-diluted oil or coolant loss. Correct the root condition before repeated cranking.
4
Test
Identify the exact system
Confirm model year, engine code and whether this truck uses Bosch common rail with generation-specific pump and injectors.
If it passes
The correct wiring diagram, scan PIDs and service procedure are selected.
If it fails
Do not borrow thresholds or torque values from another generation—the fender badge is not a service manual.
02Cranks but will not startThe starter turns the engine normally, but combustion never takes over.
1
Test
Prove cranking voltage and speed
Load-test the battery bank, voltage-drop positive and ground paths, then compare measured speed with RPM, sync, security authorization and voltage.
If it passes
Voltage, RPM, cam/crank sync and fuel authorization must remain present through the complete crank event; use the exact-year Ford cranking-speed threshold.
If it fails
Repair the weak battery, cable, ground or starter before interpreting pressure data.
2
Test
Confirm position and authorization
Watch RPM, security status and cam/crank sync and fuel-enable status while cranking.
If it passes
RPM is believable, synchronization is achieved and injection is authorized.
If it fails
Follow the sensor, tone-wheel, wiring, security or module-power path indicated by the missing input.
3
Test
Prove low-side fuel
Measure both filters, fuel-conditioning-module delivery and supply-pressure data. Test during cranking, not only key-on. Check restriction, aeration and filter sealing.
If it passes
2011–2014 switch opens at 365 kPa/53 psi. Treat sustained pressure below 53 psi as a supply fault; 2015+ uses an integrated sensor and exact-year data.
If it fails
Work tank-to-pump in sections. A high-pressure pump cannot make up for an empty, restricted or aerated inlet.
4
Test
Compare commanded and actual pressure
Graph desired versus actual rail pressure through the complete crank event.
If it passes
2011–2016 field reference: reach about 5,000 psi to start. At idle, actual should remain within ±300 psi of desired.
If it fails
Separate inlet supply, pressure control, excessive return/leakage and pump output. One low number does not condemn a pump.
5
Test
Check injection and mechanical condition
Use power balance, relative compression and approved return/leakage testing. If injection conditions are met, verify air shutoff, compression, valve motion and mechanical timing.
If it passes
2011–2016: 3 mL/15 s is a comparative field screen borrowed from GM LML, not a Ford OEM rejection limit. Use the Ford leakage procedure and preserve the required return backpressure (at least 3 bar).
If it fails
Isolate the failed cylinder/system and prove wiring, injector or mechanical cause before replacement.
03No-start · supply and return backpressure2011–2016 fuel-system references; the 53-psi switch applies specifically to 2011–2014.
1
Test
1 · Check fuel before energizing repeatedly
Sample the primary filter housing into a clean container. Document water, wrong fuel, DEF residue or metallic debris. Verify both filters and correct seating before interpreting pump data.
If it passes
Correct clean fuel and sealed filters: continue to measured supply.
If it fails
Contamination or metal: stop circulating fuel and inspect the extent of the contamination using the vehicle procedure.
2
Test
2 · Separate switch status from actual pressure
For 2011–2014, the supply switch opens at approximately 365 kPa (53 psi). Use an approved low-pressure gauge during the failed crank or loaded event, and compare switch status with the measured pressure.
If it passes
Measured supply reaches the switch threshold and stays stable: continue to rail and return checks. The switch does not provide a continuous numerical pressure reading.
If it fails
Pressure below threshold: inspect conditioning-module delivery, filter restriction, air entry and pump feed voltage. Pressure correct but status wrong: test the switch circuit.
3
Test
3 · Compare rail command and actual
Record RPM, sync, injection authorization and rail pressure during crank. For the 2011–2016 reference, look for approximately 5,000 psi (34.5 MPa). On a running engine compare desired and actual at warm stable idle.
If it passes
Starting pressure is achieved; warm idle tracks within about ±300 psi: continue to contribution and mechanical checks if needed.
If it fails
Low rail with good supply: investigate pressure-control and return leakage. Idle error exceeding about ±300 psi calls for air/sensor/control tests, not automatic pump replacement.
4
Test
4 · Preserve injector return backpressure
The piezo-injector return system requires at least 3 bar, approximately 44–45 psi. Measure with the regulated test arrangement. Keep the calibrated return restriction in circuit.
If it passes
Backpressure remains at least 3 bar: conduct the individual leakage test.
If it fails
Low return backpressure: investigate the return restriction, connectors and supply arrangement. An unrestricted hose into a bottle invalidates the test and can prevent normal injector operation.
5
Test
5 · Measure individual injector leakage
Using the approved regulated return adapter, collect each injector's return for 15 seconds during the specified crank or idle procedure. Record pressure and operating condition with each sample.
If it passes
The 3 mL/15 s figure is a comparative field screen borrowed from GM LML, not a Ford OEM rejection limit. Use the Ford application-specific leakage procedure to decide the result.
If it fails
More than 3 mL/15 s warrants further leakage testing, not automatic injector replacement. Verify backpressure, tooling and the Ford procedure before judging the injector.
04Cold sensor checks & airflow response2011–2016 reference values. Perform correlation tests before changing sensors.
1
Test
1 · Cold-soaked coolant temperature
Before the first start after a full cold soak, compare ECT with measured ambient temperature. Avoid a sun-heated sensor or a recently running engine.
If it passes
ECT within 5°F (2.8°C) of ambient: proceed with the complaint's hot/cold tests.
If it fails
Outside 5°F after a valid soak: investigate sensor bias and circuit/reference issues; do not use a hot restart for this comparison.
2
Test
2 · Check airflow in the specified configuration
For the applicable early-system airflow diagnostic, the reference test uses EGR closed and EGR/turbo disconnected as directed. Record MAF frequency at idle and 2,000 RPM. Restore connections and handle test-induced codes afterward.
If it passes
3.5–3.8 kHz at idle and 5.9–6.2 kHz at 2,000 RPM meet this reference under that setup.
If it fails
Outside those bands: verify EGR really closes, inspect intake leaks/restriction and validate the signal before condemning MAF. Connected, normally controlled airflow is not comparable to this test.
05Low-side warning · switch versus gauge2011–2014 pressure-switch system; 2015–2016 uses a pressure/temperature sensor.
1
Test
Measure delivery under the fault
Connect a fuel-rated gauge at the high-pressure-pump supply test point. Record cranking and loaded pressure alongside the low-fuel-pressure status.
If it passes
Common normal band: 53–73 psi. If pressure stays in range, check the electrical status.
If it fails
Below approximately 53 psi: check both filters, pump feed/ground, restriction and aeration before testing high-pressure components. Above the stated normal band: confirm gauge accuracy, installed pump/regulator and return restriction against the exact-year procedure; do not classify excessive pressure as a pass.
2
Test
Check the switch transition
On 2011–2014, compare gauge pressure with switch state. The switch opens around 365 kPa (53 psi); sustained closure beyond 60 seconds can produce a warning/derate.
If it passes
Gauge and switch agree: continue rail-pressure diagnosis.
If it fails
Gauge is normal but status stays low: test switch and wiring. Do not replace the supply pump based on status alone.
3
Test
Select the later sensor procedure
For 2015–2016, compare the integrated pressure sensor with the gauge throughout the complaint.
If it passes
Agreement and stable delivery: proceed to rail control/leakage.
If it fails
Disagreement: test reference, ground and signal. Do not use the earlier switch continuity test on this sensor.
06Starts, then diesThe engine lights off, runs briefly and shuts down or loses pressure.
1
Test
Record the shutdown
Graph RPM, commanded/actual pressure, supply status, key voltage, run permission and air-shutoff position through the stall.
If it passes
One signal changes first and points to a system.
If it fails
If every PID drops together, inspect ignition feed, module power, grounds and network communication.
2
Test
Watch the supply side
Repeat the event while measuring both filters, fuel-conditioning-module delivery and supply-pressure data.
If it passes
Supply stays stable after the engine catches.
If it fails
Check a blocked tank vent or pickup, collapsing hose, filter seal, weak lift pump or air entry.
3
Test
Watch pressure control
Compare desired versus actual rail pressure and pump metering, rail control and return backpressure where applicable as it dies.
If it passes
If actual differs from desired by more than ±300 psi at idle, eliminate air/contamination and an intermittent FRP signal before condemning a regulator.
If it fails
If pressure falls first, isolate leakage, regulator/control and supply. If command disappears first, follow the control reason.
4
Test
Rule out commanded shutdown
Check security, crash/fuel cutoff, PTO/idle shutdown, temperature protection and throttle/air-shutoff commands.
If it passes
No module is requesting shutdown.
If it fails
Resolve the requesting system instead of bypassing a safety strategy.
07Hard start—hot or coldLong crank time, temperature-sensitive starting or restart trouble.
1
Test
Split hot from cold
Log the first cold start and a fully heat-soaked restart using the same PID list.
If it passes
The same system fails in both tests.
If it fails
Temperature-only failure: focus on rail leakage/control, supply pressure, cranking speed and temperature inputs, starting aids, viscosity and temperature-dependent leakage.
2
Test
Compare temperature sensors cold
Before starting, compare coolant, oil, intake-air and ambient readings.
If it passes
Sensors agree closely with actual ambient temperature.
If it fails
Test the biased sensor, reference voltage, ground and connector before replacing fuel parts.
3
Test
Measure time to pressure
Overlay cranking speed with desired versus actual rail pressure; note how quickly actual responds.
If it passes
2011–2016 field reference: reach about 5,000 psi to start. At idle, actual should remain within ±300 psi of desired.
If it fails
A slow rise points toward drain-back, air entry, inlet restriction, leakage or worn pressure-producing parts.
4
Test
Verify starting aids
Command glow plugs, intake heater or grid heater where equipped; voltage-drop the feed and confirm current draw by bank or circuit.
If it passes
Command, voltage and current are present and balanced.
If it fails
Diagnose the relay/module, feed, ground or elements. Do not judge the system by dash-lamp time.
08Rough run, miss or knockUneven idle, cylinder contribution complaint, sharp knock or intermittent cutout.
1
Test
Define the operating condition
Note cold/hot, idle/in gear, speed, load and whether the noise follows fuel quantity or mechanical speed.
If it passes
The complaint can be reproduced in a controlled window.
If it fails
Use temperature survey and recorded scan data to catch the intermittent event.
2
Test
Find the weak cylinder
Run contribution, balance or cutout testing, then confirm with power balance, relative compression and approved return/leakage testing.
If it passes
The same cylinder is identified by more than one test.
If it fails
A system-wide pattern points toward fuel quality, pressure control, airflow, timing or voltage—not one injector.
3
Test
Separate injector from cylinder
Pair injector evidence with relative compression, crankcase pressure, valve-train inspection and cylinder temperature.
If it passes
Injector evidence is consistent and mechanical checks pass.
If it fails
Low compression or abnormal valve motion requires mechanical diagnosis before fuel-system spending.
4
Test
Check shared systems
Graph desired versus actual rail pressure, charging voltage and airflow while the miss occurs.
If it passes
Pressure, voltage and airflow stay stable.
If it fails
Multiple bad cylinders usually mean a shared supply, control, ground or air-path problem.
09Black, white or blue smokeUse color, odor, temperature and operating condition as clues—not a verdict.
1
Test
Classify the smoke
Record when it occurs, odor, oil/coolant consumption and whether it changes with cutout, boost or temperature.
If it passes
Fuel, oil and coolant possibilities are separated.
If it fails
Do not assume white means coolant or blue means oil. Verify fluid loss and cylinder response.
2
Test
Black smoke: test air first
Inspect filter/ducts, pressure-test charge air, check pre-turbo exhaust leaks and validate MAF, MAP, EBP and turbo command/position.
If it passes
Measured airflow and boost match command without leaks or restriction.
If it fails
Repair air, EGR, turbo or sensor faults before judging injector quantity.
3
Test
White smoke: test combustion
Verify starting aids, temperature inputs, compression, injection timing/pressure and contribution.
If it passes
Smoke clears warm and no fluid is disappearing.
If it fails
Eye-burning smoke suggests unburned fuel; sweet vapor plus coolant loss requires cooling-system isolation.
4
Test
Blue smoke: test the oil path
Inspect turbo inlet/outlet and drain, crankcase ventilation, oil level and cylinder sealing.
If it passes
No abnormal oil enters intake/exhaust and crankcase pressure is controlled.
If it fails
Correct turbo, drain, ventilation, guide/seal or ring fault before aftertreatment damage follows.
10Low power, no boost or derateTest under the load that creates the complaint. Idle checks rarely prove a power problem.
1
Test
Check for an intentional derate
Save codes and inspect torque-limit reason, aftertreatment status, fuel-pressure protection and transmission requests.
If it passes
No controller is intentionally limiting torque.
If it fails
Repair the initiating condition and complete the required service routine. Do not tune around protection.
2
Test
Prove fuel delivery under load
Log both filters, fuel-conditioning-module delivery and supply-pressure data, desired versus actual rail pressure and fuel command during a controlled loaded pull.
If it passes
Supply and actual pressure remain on target as demand rises.
If it fails
A value that collapses under load identifies restriction, aeration, control, leakage or capacity direction.
3
Test
Pressure-test the air path
Test compressor outlet to intake, inspect exhaust before the turbine, and compare MAF, MAP, EBP and turbo command/position.
If it passes
System holds pressure and command/position agree.
If it fails
Repair leaks, restriction, actuator/geometry or biased sensors before replacing a turbo.
4
Test
Check exhaust restriction
Review differential pressure, soot load, regeneration history and DPF pressure, EGT correlation, SCR/DEF pressure and NOx data.
If it passes
Restriction is reasonable for operating condition.
If it fails
Find the engine-side reason for repeat loading before cleaning or replacing the filter.
11Fuel supply, pressure control & injectorsTreat low pressure, high pressure and injector return as separate systems.
1
Test
Sample before disturbing
Draw fuel from the housing/tank low point into a clean clear container. Inspect for water, gasoline, DEF, growth and metal.
If it passes
Fuel is clean and correct.
If it fails
Stop and document contamination. Follow the OEM extent-of-repair procedure without circulating more debris.
2
Test
Measure inlet health
Install the correct gauge/restriction tool and verify both filters, fuel-conditioning-module delivery and supply-pressure data at idle and under demand.
If it passes
Pressure, volume and restriction stay in range without bubbles.
If it fails
Isolate pickup, lines, heater/housing, filter and pump. Fix the inlet before high pressure.
3
Test
Test pressure control
Command or graph pump metering, rail control and return backpressure where applicable against desired versus actual rail pressure. Inspect the harness before removing a regulator.
If it passes
Actual responds smoothly and follows command.
If it fails
Perform the model-year regulator, relief and leakage tests; inspect approved locations for debris.
4
Test
Prove injector performance
Follow the exact service procedure for power balance, relative compression and approved return/leakage testing. Use approved caps, adapters and return tools only.
If it passes
2011–2016: 3 mL/15 s is a comparative field screen borrowed from GM LML, not a Ford OEM rejection limit. Use the Ford leakage procedure and preserve the required return backpressure (at least 3 bar).
If it fails
Confirm the suspect with a second test and correct contamination or compression causes before parts.
12Electrical, sensors & no communicationA scan PID is a clue. A meter and wiring diagram prove the circuit.
1
Test
Stabilize system voltage
Load-test each battery separately; voltage-drop main positive and ground paths during crank and electrical load.
If it passes
Voltage remains stable and drops are low on every path.
If it fails
Repair the exact high-drop connection. Replace batteries as a matched set when required.
2
Test
Check module powers and grounds
Use the diagram. Back-probe powers and ground voltage-drop with the circuit loaded—an ohmmeter alone is not enough.
If it passes
Every feed and ground carries load without excessive drop.
If it fails
Repair fuse, relay, feed or ground before condemning a controller.
3
Test
Validate a suspicious sensor
Compare to a related sensor KOEO, then verify 5 V reference, low reference and signal while graphing a wiggle test.
If it passes
Signal changes smoothly and agrees with a mechanical reference.
If it fails
Isolate sensor from harness; unplug shared-reference sensors one at a time if the reference is pulled down.
4
Test
Diagnose no communication
Verify DLC power/ground, measure network bias key-on, resistance power-off, then isolate branches with the diagram.
If it passes
Network values and module list are normal.
If it fails
Locate the shorted/open branch or module by sectional isolation—do not shotgun computers.
13EGR, turbo & aftertreatmentRepair combustion and airflow faults before blaming the DPF or SCR system.
1
Test
Check sensor plausibility cold
With exhaust cold, compare temperature sensors, pressure sensors and ambient inputs before startup.
If it passes
Related sensors agree near ambient and zero differential as designed.
If it fails
Circuit-test the outlier; swap-test only where service information allows.
2
Test
Verify EGR and turbo response
Command devices while watching position feedback, MAF/MAP response and MAF, MAP, EBP and turbo command/position.
If it passes
Feedback follows command and airflow changes logically.
If it fails
Inspect sticking, deposits, leaks, actuator calibration and wiring before replacing assemblies.
3
Test
Find why it is loading
Review DPF pressure, EGT correlation, SCR/DEF pressure and NOx data, regeneration history, idle time and engine-side codes.
If it passes
Loading matches use and regeneration completes normally.
If it fails
Fix injector, boost, EGR, temperature, thermostat or oil-consumption causes before servicing the filter.
4
Test
Perform service routines correctly
Use the proper scan tool for resets, learns, dosing tests and stationary regeneration. Confirm prerequisites first.
If it passes
Routine completes and monitored values respond as expected.
If it fails
Never reset ash or soot counters unless the specified physical service was completed.
14DTC strategy & proof after repairA code names a failed test—not automatically the failed part.
1
Test
Sort the codes
Group voltage/network first, then synchronization, fuel pressure, airflow and aftertreatment. Use freeze-frame to find the first event.
If it passes
One primary fault explains downstream codes.
If it fails
If unrelated modules set low-voltage codes together, return to battery, charging and grounds.
2
Test
Read set conditions
Use exact-year service information for enable criteria, threshold and monitor behavior.
If it passes
The fault can be tested under its actual set conditions.
If it fails
A monitor that cannot run yet cannot be called fixed. Satisfy prerequisites first.
3
Test
Prove the repair
Repeat the original failure window, rerun self-tests and compare before/after recordings.
If it passes
Complaint is gone, monitors run and data stays in range.
If it fails
A cleared light is not a repair. Continue the branch that still fails.
Mechanical reference library
Common specifications & procedures
Application disclaimer: These are common reference specifications. Always look up the current OEM procedure and specifications for your exact vehicle, VIN/engine serial number and installed hardware before performing repairs. Model year, engine revisions and replacement parts can change the requirements. For aftermarket fasteners, follow the current instructions for the exact kit and lubricant.
Choose the exact assembly below. Each entry identifies its hardware, preparation, torque stages and exclusions. This is a reference for the listed operation, not a complete engine rebuild manual.
1 matching procedures. Confirm the full application and installed hardware before using a value.
Damper / crank attachment · Fluidampr2011–2016 6.7L Power Stroke with Fluidampr 800221
Hardware: Listed Fluidampr damper with new OEM bolts: 800221; new torque-to-yield bolts
- 22 ft-lb / ≈30 N·m, then 90°
Before you start
Verify the exact damper and bolt set. Clean pilot and mating surfaces; confirm correct bolt engagement and installation tooling.
Procedure
- Seat the damper fully. Torque using the matching OEM sequence and the value above; measure any angle stage with an angle gauge.
Final check
Check pulley alignment, belt clearance and fastener completion before running.
Do not cross-apply
Not for aftermarket high-strength bolt kits or another damper assembly. Never add a torque-to-yield angle a second time as a recheck.
Known failure directions
Common is a place to test, not permission to replace.
- DEF/water/wrong fuel
- Filter restriction
- High-pressure metal
- Rail-control/return leakage
- Turbo/charge-air faults
- EGT/DEF/NOx chains
What to send the shop
Year, engine or RPO, cold or hot, all codes, freeze-frame, cranking log, fuel sample findings, recent work and which tests passed or failed.
Call (915) 247-2782