Engine Controls - Pinpoint Tests - 6.0L Diesel: Diagnosis

Inspection

The basic diagnostic procedure recommended for most sensor and actuator circuits is to disconnect the harness at the connector and inspect for corrosion, bent pins, spread pins or any condition that could cause a loose or intermittent connection.

Test Procedure

A1 DIAGNOSTIC TROUBLE CODES (DTCS) P0560, P0562, OR P0563 NOTE: DTC P0563 may set during a 24 volt jump start. DTC P0562 may set during crank with a low battery condition. Check the battery and charging system voltages. Refer to the appropriate GENERATORS & REGULATORS article. ARE THE BATTERY AND CHARGING SYSTEM VOLTAGES WITHIN SPECIFICATIONS? Yes No Go to A2 . REPAIR as necessary. refer to the appropriate GENERATORS & REGULATORS article.
A2 CHECK THE PCM RELAY VOLTAGE CIRCUITS NOTE: For E-Series, the PCM diode is internal to the battery junction box (BJB). REFER to the appropriate SYSTEM WIRING DIAGRAMS article for PCM relay coil pin locations. Key off. Disconnect the PCM relay. Key on, engine off. Measure the voltage between the PCM relay battery voltage circuit pin 30, harness side and ground; and measure the voltage between the PCM relay coil power circuit, harness side and ground. ARE THE VOLTAGES GREATER THAN 10.5 VOLTS? Yes No Go to A3 . REPAIR the circuit in question.
A3 CHECK THE PCM RELAY COIL GROUND CIRCUIT NOTE: For F-SuperDuty/Excursion, the PCM diode is internal to the central junction box (CJB). REFER to the appropriate SYSTEM WIRING DIAGRAMS article for PCM relay coil pin locations. Connect a test lamp between the PCM relay pin 30, harness side and the PCM relay coil ground circuit, harness side. IS THE TEST LAMP ILLUMINATED? Yes No Go to A4 . REPAIR the open ground circuit.
A4 CHECK THE PCM RELAY Perform the PCM relay component test. REFER to the appropriate COMPONENT TESTING article. DOES THE PCM RELAY PASS THE COMPONENT TEST? Yes No Go to A5 . INSTALL a new PCM relay.
A5 CHECK THE PCM POWER CIRCUITS FOR AN OPEN Key off. Disconnect the PCM body harness connector. Measure the resistance between the PCM relay pin 87, harness side and the PCM body harness connector pins 34 and 46, harness side. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to A6 . REPAIR the circuit in question.
A6 CHECK THE PCM GROUND CIRCUITS FOR AN OPEN Measure the resistance between the PCM body harness connector pins 10, 11 and 23, harness side and ground. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No CLEAR the DTCs. REPEAT the self-test. If DTC P0560, P0562, or P0563 is present again, INSTALL a new PCM. REPAIR the circuit in question.

B1 CHECK VREF CIRCUIT NOTE: More than one VREF circuit may be present, all VREF circuits must be checked. Key off. Disconnect any 3-wire sensor. Key on. Measure the voltage between VREF signal circuit and ground. IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No Go to B4 . Go to B2 .
B2 CHECK VREF FOR A SHORT TO GROUND AND SIG RTN Key off. Disconnect the PCM harness connector. Measure the resistance between suspect sensor VREF circuit and ground. Measure the resistance between suspect sensor VREF circuit and SIG RTN circuit, harness side. ARE BOTH RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to B3 . REPAIR short in circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
B3 CHECK VREF CIRCUIT FOR AN OPEN Measure the resistance between PCM harness connector and faulty sensor VREF circuit. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in VREF circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
B4 CHECK VREF AND SIG RTN CIRCUITS OF FAULTED SENSOR Disconnect suspect sensor. Key on. Measure the voltage between VREF circuit and SIG RTN circuit at the harness connector of the failed sensor. IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No WIGGLE the harness. CHECK for damaged or corroded pins. CHECK for loose connection. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to B5 .
B5 CHECK SIG RTN CIRCUIT FOR AN OPEN Key off. Measure the resistance between SIG RTN circuit and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to B6 . REPAIR open in SIG RTN circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
B6 CHECK VREF CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM harness connector of faulty sensor. Measure the resistance between VREF circuit and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to B7 . REPAIR VREF circuit short to ground. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
B7 CHECK VREF CIRCUIT FOR AN OPEN Key off. Measure the resistance between the PCM harness connector VREF signal circuit and fault sensor VREF circuit. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in VREF circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

C1 DIAGNOSTIC TROUBLE CODE (DTC) P0704 NOTE: Refer to the PCM and component connector pin numbers see scheme 6 at the beginning of this pinpoint test. NOTE: No PID transition indicates a CPP circuit failure. Connect the scan tool. Key on. Access CPP/PNP PID. Apply and release the clutch pedal. DOES THE PID READ ON ONLY? Yes No Go to C2. Go to C4.
C2 CHECK CPP SWITCH Disconnect the CPP switch. DOES THE PID Go to OFF? Yes No INSTALL a new CPP switch. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to C3.
C3 CHECK CPP CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness connector. Key on. Measure the voltage between the PCM body harness connector pin 36 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to voltage. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
C4 CHECK CPP SWITCH Key off. Remove CPP switch. Measure the resistance across CPP switch terminals. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to C5. INSTALL a new CPP switch. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
C5 CHECK CPP CIRCUIT FOR AN OPEN Reinstall CPP switch. Measure the resistance between the PCM body harness connector pin 36 and the non-powered side of the fuse block. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in wiring. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

D1 PRELIMINARY DIAGNOSIS FOR DTCS P0335, P0336, P2617 NOTE: Some DTCs require that the engine go through more than one key cycle to set. NOTE: DTCs P0336 and P2617 are calibrated to an increment counter. To set a DTC requires greater than 5 consecutive fault events in the crank mode or 10 fault events in the run mode. Perform the required number of key cycles from RUN to START to RUN (cycling to OFF will reset timer) and then perform the KOEO or KOER self-test. Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform the KOEO on-demand self-test. Perform the KOER on-demand self-test. IS DTC P0335, P0336 OR P2617 PRESENT? Yes No For DTCs P0335 or P0336: Go to D2. For DTC P2617, Go to D8. Unable to duplicate condition. CHECK for loose connection, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540), to diagnose a no-start condition.
D2 DIAGNOSTIC TROUBLE CODE (DTC) P0335, P0336 NOTE: Refer to the PCM and component connector pin numbers, see scheme 7, see scheme 8 and see scheme 9, at the beginning of this pinpoint test. Possible causes: one or both sensor outputs open one of both sensor outputs shorted to ground sensor outputs shorted together one output open and the other output shorted to ground sensor output shorted to voltage CKP sensor PCM DOES THE ENGINE START? Yes No Go to D3. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540), to diagnose no-start condition.
D3 CHECK THE RESISTANCE OF THE CKP SENSOR Key off. Disconnect the PCM engine harness connector. Measure the resistance between PCM engine harness connector pin 30 and pin 41. IS THE RESISTANCE BETWEEN 300 AND 400 OHMS? Yes No Go to D5. Go to D6.
D5 CONFIRM PCM FAULT NOTE: Some DTCs require that the engine go through more than one key cycle to set. Key on. Reconnect all electrical connectors. Key on. Clear all DTCs. Perform the KOEO on-demand self-test. Perform the KOER on-demand self-test. IS DTC P0335, P0336 OR P2617 PRESENT? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Unable to duplicate the condition. CHECK for loose connection, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
D6 CHECK CKP CIRCUITS FOR A SHORT TO GROUND Disconnect the CKP sensor. Inspect the CKP sensor for damaged or corroded pins. Measure the resistance between PCM engine harness connector as follows: pin 30 and ground pin 41 and ground pin 30 and pin 42 pin 41 and pin 42 ARE THE RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to D7. REPAIR short in CKP sensor circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
D7 CHECK CKP SENSOR CIRCUITS FOR AN OPEN Measure the resistance between the PCM engine harness connector pin 30 and CKP sensor harness connector pin 1; and PCM engine harness pin 41 and CKP sensor harness connector pin 2. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No INSTALL a new CKP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
D8 DIAGNOSTIC TROUBLE CODE (DTC) P2617 NOTE: Refer to the PCM, FICM and component connector pin numbers, see scheme 7, see scheme 8 and see scheme 9, at the beginning of this pinpoint test. NOTE: Some DTCs require that the engine go through more that one key cycle to set. NOTE: DTCs P2617 and P2614 may set simultaneously after an engine stalling event. Note: DTCs P0336 and P2617 are calibrated to an increment counter. To set a DTC requires greater than 5 consecutive fault events in the crank mode or 10 fault events in the run mode. Perform the required number of key cycles from RUN to START to RUN (cycling to OFF will reset timer) and then perform the KOEO or KOER self-test. Possible causes: signal shorted to voltage signal shorted to ground signal circuit open PCM Perform the KOEO on-demand self-test. Perform the KOER on-demand self-test. IS DTC P2617 PRESENT? Yes No Go to D9. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
D9 CHECK CRANKSHAFT POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Disconnect the FICM harness connector C. Key on. Measure the voltage between FICM harness connector C pin 5 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to D10. REPAIR short to voltage. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
D10 CHECK CRANKSHAFT POSITION SIGNAL FOR A SHORT TO GROUND Key off. Measure the resistance between FICM harness connector C pin 5 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to D11. REPAIR short to ground in signal output circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
D11 CHECK CRANKSHAFT POSITION SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between FICM harness connector C pin 5 and PCM engine harness connector pin 19. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in output signal circuit.

E1 PRELIMINARY DIAGNOSIS FOR DTCS P0236, P0237, P0238 Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the KOEO On-Demand Self Test. Perform the KOER On-Demand Self Test. IS DTC P0236, P0237 OR P0238 PRESENT? Yes No For DTC P0236, Go to E2. For DTC P0237, Go to E6. For DTC P0238, Go to E10. Unable to duplicate condition. CHECK for loose connection, damaged or corroded pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
E2 DIAGNOSTIC TROUBLE CODE (DTC) P0236 Possible causes: restricted MAP hose low turbo boost intake manifold restricted MAP sensor PCM Perform visual inspection. Inspect MAP sensor hose and manifolds for damage, leaks, restrictions and misrouting. ARE MANIFOLDS AND MAP HOSE OK AND FREE FROM DAMAGE? Yes No Go to E3. REPAIR leaks as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E3 CHECK MAP SENSOR NOTE: Refer to the «MAP VOLTAGE TABLE»(ref-225542-S16207991562006031800000) at beginning of the pinpoint test. Access MAP VOLT PID. Key on. IS THE VOLTAGE +/- 0.5 VOLTS FOR GIVEN ALTITUDE? Yes No Go to E4. INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E4 MAP SENSOR VOLTAGE CHECK Disconnect pressure hose from MAP sensor. Key on, engine off. Using Pressure Adapter Kit 014-00761 or equivalent (gauge bar), apply 69 kPa (10 psi) of pressure to the MAP sensor. Measure voltage between MAP sensor harness connector signal pin 2 and ground. IS THE VOLTAGE READING 2.8 VOLTS +/- 0.3 VOLTS? Yes No Go to E5. INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E5 MAP PERFORMANCE TEST Connect pressure hose to MAP sensor. Disconnect MAP sensor pressure hose from intake manifold and install a pressure (boost) gauge. Record the gauge pressure. Road test the vehicle and accelerate vehicle to achieve full boost. DOES THE BOOST PRESSURE EXCEED 82 KPA (12 PSI) AT FULL ACCELERATION/BOOST AND RETURN TO THE RECORDED GAUGE PRESSURE AT IDLE? Yes No RESTORE the vehicle. CLEAR DTCs and RETEST the system. If DTC returns, INSTALL a new PCM. INSPECT intake manifolds for leaks. CHECK turbo condition, refer to the appropriate FUEL CHARGING AND CONTROLS article.
E6 DIAGNOSTIC TROUBLE CODE (DTC) P0237 NOTE: Refer to the PCM and component connector pin numbers, see scheme 10 and see scheme 11, at the beginning of this pinpoint test. Possible causes: MAP signal circuit open or shorted to ground open VREF circuit MAP sensor PCM Key off. Disconnect the MAP sensor. Key on. Measure the voltage between the VREF circuit pin 1 and signal return circuit pin 3. IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No Go to E7. REPAIR open in VREF or signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E7 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM body harness electrical connector. Measure the resistance between the MAP sensor harness connector pin 2 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to E8. REPAIR short to ground in the signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E8 CHECK SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between MAP sensor electrical connector signal circuit pin 2 and PCM body harness electrical connector pin 41. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to E9. REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E9 CHECK MAP SENSOR CIRCUIT NOTE: This step may cause DTC P0238 to set. Reconnect the PCM body harness connector. Key on, engine off. Access MAP VOLT PID. Record the MAP VOLT PID reading. Install a jumper wire between MAP sensor VREF circuit and signal circuit. IS THE MAP PID VOLTAGE READING APPROXIMATELY 4.0 TO 5.5 VOLTS? Yes No INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E10 DIAGNOSTIC TROUBLE CODE (DTC) P0238 NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip, etc.). Refer to Diesel Electronic Control (EC) System, «MODIFICATIONS TO OBD VEHICLES»(ref-225536-S36718124042006031800000). NOTE: Refer to the PCM and component connector pin numbers, see scheme 10 and see scheme 11, at the beginning of this pinpoint test. Possible causes: signal circuit shorted to power open ground circuit MAP sensor PCM Induce opposite DTC. Install the scan tool. Clear all DTCs. Disconnect the MAP sensor electrical connector. Perform the On-Demand Self Test. IS DTC P0237 SET? Yes No INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to E11.
E11 CHECK MAP SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness connector. Key on. Measure the voltage between the MAP sensor harness connector pin 2 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to E12. REPAIR short to voltage in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
E12 CHECK MAP SENSOR SIGNAL RETURN FOR AN OPEN Key off. Measure the resistance between MAP sensor harness connector pin 3 signal return and PCM body harness electrical connector pin 33. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

F1 PRELIMINARY DIAGNOSIS FOR DTCs P0112, P0113 Perform a visual inspection. Connect scan tool. Retrieve and record any continuous and on-demand DTCs. Record freeze frame data. Clear all DTCs. Perform On-Demand Self-Test. ARE DTCS P0112 OR P0113 PRESENT? Yes No For P0112, Go to F2. For P0113, Go to F4. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
F2 DIAGNOSTIC TROUBLE CODE (DTC) P0112 NOTE: Refer to the PCM and component connector, see scheme 12 and see scheme 13, at the beginning of this pinpoint test. Possible causes: circuit shorted to ground IAT sensor PCM Check for opposite failure. Key off. Disconnect the IAT sensor. Perform On-Demand Self-Test. IS DTC P0113 PRESENT? Yes No INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to F3.
F3 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM body harness connector. Measure the resistance between IAT sensor electrical connector pin 6, and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to ground in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
F4 DIAGNOSTIC TROUBLE CODE P0113 NOTE: Refer to the PCM and component connector, see scheme 12 and see scheme 13, at the beginning of this pinpoint test. Possible Causes: circuit shorted to voltage open in signal return circuit IAT sensor PCM Key off. Disconnect the IAT sensor. Install a jumper between pins 1 and 6, of the IAT sensor electrical connector. Key on. Perform On-Demand Self-Test. IS DTC P0112 PRESENT? Yes No INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to F5.
F5 CHECK SIGNAL RETURN CIRCUIT FOR AN OPEN Key off. Disconnect the PCM body harness electrical connector. Measure the resistance between IAT sensor connector pin 1, and the PCM body harness electrical connector pin 33. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to F6. REPAIR open in the IAT sensor return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
F6 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key on. Measure the voltage between IAT sensor connector pin 6 and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR short in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to F7.
F7 CHECK SIGNAL CIRCUIT FOR AN OPEN Key off. Measure the resistance between the PCM body harness pin 43, and IAT sensor connector pin 6. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in the IAT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

G1 PRELIMINARY DIAGNOSIS FOR DTCs P0096, P0097, P0098 Perform the visual inspection. Connect the scan tool. Retrieve and record any continuous and on-demand DTCs. Clear all DTCs. Perform the On-Demand Self Test. ARE DTCS P0096, P0097 OR P0098 PRESENT? Yes No For P0096, Go to G2. For P0097, Go to G6. For P0098, Go to G8. Unable to duplicate condition. CHECK for loose connection, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
G2 DIAGNOSTIC TROUBLE CODE P0096 NOTE: Refer to the PCM and component connector, see scheme 14 and see scheme 15, at the beginning of this pinpoint test. Possible causes: IAT2 sensor circuitry IAT2 sensor PCM Inspect IAT 2 sensor circuitry at sensor and PCM. ARE ALL CONNECTORS AND TERMINALS OK? Yes No Go to G3. REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
G3 CHECK IAT2 SENSOR FAULT CODES Perform On-Demand Self Test. ARE OTHER DTCS PRESENT? Yes No REPAIR other faults before proceeding. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Only P0096 present, Go to G4.
G4 CHECK IAT2 SENSOR OPERATION Clear continuous DTCs. Key on. Using scan tool, monitor IAT2 and engine oil temperature PIDS. Record IAT2 sensor temperature reading. Drive vehicle while monitoring IAT2 sensor reading. Operate vehicle until it reaches normal operating temperature, EOT above 176°F. Idle engine for ten minutes. DID IAT2 READINGS CHANGE FROM VALUE RECORDED AT ANY TIME? Yes No Unable to duplicate the condition. CHECK for loose connections, damaged or corroded terminals. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if driveability concern exists. INSTALL a new IAT2 sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
G6 DIAGNOSTIC TROUBLE CODE P0097 NOTE: Refer to the PCM and component connector, see scheme 14 and see scheme 15, at the beginning of this pinpoint test. Possible causes: circuit shorted to ground IAT2 sensor PCM Check for opposite failure. Key off. Disconnect the IAT2 sensor. Perform the On-Demand Self Test. IS DTC P0098 PRESENT? Yes No INSTALL a new IAT2 sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to G7.
G7 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM engine harness connector. Measure the resistance between the IAT2 sensor electrical connector pin 2 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to ground in the IAT2 sensor signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
G8 DIAGNOSTIC TROUBLE CODE P0098 NOTE: Refer to the PCM and component connector, see scheme 14 and see scheme 15, at the beginning of this pinpoint test. Possible causes: circuit shorted to voltage open in signal return circuit IAT2 sensor PCM Key off. Disconnect the IAT2 sensor. Measure the resistance between IAT2 sensor connector pin 1, and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to G9. REPAIR open in the IAT2 sensor return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
G9 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness electrical connector. Key on. Measure the voltage between IAT2 sensor connector pin 2 and ground. IS THE VOLTAGE GREATER THAN 0.2 VOLTS? Yes No REPAIR short to voltage in the IAT2 sensor signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to G10.
G10 INDUCE OPPOSITE FAILURE Install a jumper between pins 1 and 2, of the IAT2 sensor electrical connector. Key on. Perform the On-Demand Self Test. IS DTC P0097 PRESENT? Yes No INSTALL a new IAT2 sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to G11.
G11 CHECK SIGNAL CIRCUIT FOR AN OPEN Key off. Measure the resistance between the PCM engine harness pin 45, and IAT2 sensor connector pin 2. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in the IAT2 signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

H1 PRELIMINARY DIAGNOSIS FOR DTCs P0107, P0108 Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the KOEO On-Demand Self Test. ARE DTCS P0107 OR P0108 PRESENT? Yes No For P0107, Go to H2. For P0108, Go to H6. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
H2 DIAGNOSTIC TROUBLE CODE (DTC) P0107 NOTE: Refer to the PCM and component connector pin numbers, see scheme 16 and see scheme 17, at the beginning of this pinpoint test. Possible causes: signal circuit short to ground VREF circuit open BARO sensor PCM Key off. Disconnect BARO sensor electrical connector. Key on. Measure voltage between VREF and SIG RTN circuits at the BARO connector pin 2 and pin 1. IS THE VREF VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No Go to H3. Go to «PINPOINT TEST B»(ref-225542-S22793258852006031800000) to diagnose VREF and SIG RETURN.
H3 INDUCE OPPOSITE DTC Key off. Install a jumper wire between BARO sensor electrical connector pin 2 and pin 3. Key on. Perform the KOEO On-Demand Self Test. IS DTC P0108 PRESENT? Yes No INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to H4.
H4 CHECK SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM body harness electrical connector. Measure the resistance between BARO sensor connector pin 3 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to H5. REPAIR short to ground in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
H5 CHECK SIGNAL CIRCUIT FOR AN OPEN Measure resistance between BARO sensor electrical connector pin 3 and PCM body harness connector pin 38. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
H6 DIAGNOSTIC TROUBLE CODE (DTC) P0108 NOTE: Refer to the PCM and component connector pin numbers, see scheme 16 and see scheme 17, at the beginning of this pinpoint test. Possible causes: circuit short to voltage open in signal return circuit BARO sensor PCM Key off. Induce the opposite DTC. Disconnect the BARO sensor. Key on. Perform On-Demand Self Test. IS DTC P0107 PRESENT? Yes No INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to H7.
H7 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness electrical connector. Key on. Measure the voltage between BARO sensor connector pin 3 and ground. IS THE VOLTAGE GREATER THAN 0.2 VOLTS? Yes No REPAIR short to voltage in the BARO sensor signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to H8.
H8 CHECK SIGNAL RETURN CIRCUIT FOR AN OPEN Key off. Measure the resistance between the BARO sensor connector pin 1 and PCM body harness connector pin 33. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in the signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

I1 DIAGNOSTIC TROUBLE CODE (DTC) P1536 NOTE: When performing the key on engine running (KOER) self-test, wait five seconds after beginning the test before operating the parking brake. Possible causes: parking brake not applied and released during KOER self-test parking brake switch parking brake signal circuit short to ground parking brake signal circuit open Key on, engine off. Access the PBA PID. Apply and release the parking brake. DOES THE PBA PID INDICATE OFF WITH THE PARKING BRAKE RELEASED AND DOES THE PBA PID INDICATE ON WITH THE PARKING BRAKE APPLIED? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. If the PBA PID indicates ON, Go to I2 . If the PBA PID indicates OFF, Go to I4 .
I2 CHECK THE PARKING BRAKE SWITCH Key off. Disconnect the parking brake switch. Key on, engine off. Access the PBA PID. DOES PID INDICATE OFF? Yes No INSTALL a new parking brake switch. Go to I3 .
I3 CHECK THE PARKING BRAKE SIGNAL CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM body harness connector. Measure the resistance between the PCM body harness connector pin 17, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
I4 CHECK THE PARKING BRAKE SIGNAL CIRCUIT VOLTAGE Key off. Disconnect the parking brake switch. Key on, engine off. Measure the voltage between the parking brake switch signal circuit pin 1, harness side and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No Go to I6 . Go to I5 .
I5 CHECK PARKING BRAKE CIRCUIT FOR AN OPEN Key off. Disconnect the PCM body harness connector. Measure the resistance between the parking brake switch signal circuit pin 1, harness side and the PCM body harness connector pin 17, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
I6 CHECK THE PARKING BRAKE GROUND CIRCUIT FOR AN OPEN Key off. Measure the resistance between the parking brake switch ground circuit pin 2, harness side and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new parking brake switch. REPAIR the circuit.

J1 PRELIMINARY DIAGNOSIS FOR DTCs P0101, P0103, P1102 Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the KOEO On-Demand Self-Test. Perform the KOER On-Demand Self-Test. ARE DTCS P0101, P0103 OR P1102 PRESENT? Yes No For P0101, Go to J2. For P1102, Go to J4. For P0103, Go to J8. Unable to duplicate condition. CHECK for restriction in air flow and water intrusion. CHECK for loose connection, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if driveability concern exists.
J2 DIAGNOSTIC TROUBLE CODE (DTC) P0101 Possible causes: MAF sensor contaminated sensor unmetered air flow into engine PCM Check MAF sensor for contamination. IS ANY RESTRICTION OR CONTAMINATION PRESENT? Yes No REMOVE restriction and REPAIR system as necessary. CLEAR DTCs and RETEST the system. Go to J3.
J3 CHECK MAF OUTPUT SIGNAL TO PCM Access MAF PIDs. Engine running. Monitor MAF PID volts at idle. Increase idle to approximately 2,500 rpm while monitoring PID. IS MAF PID VALUE 1.4 TO 1.8 VOLTS WITH ENGINE IDLING AND 1.9 TO 2.1 VOLTS AT 2,500 RPM? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J4 DIAGNOSTIC TROUBLE CODE (DTC) P1102 NOTE: Refer to the PCM connector pin numbers, see scheme 21 and see scheme 22, at the beginning of this pinpoint test. Possible causes: restricted air flow MAF sensor disconnected VPWR circuit open to MAF PWR GND circuit open to MAF MAF RTN signal open MAF signal shorted to ground mechanical failure MAF sensor PCM Inspect air intake for restrictions Key off. Disconnect the MAF sensor harness connector. Key on. Measure the voltage between the MAF sensor VPWR circuit pin 2, harness side and MAF PWR GND pin 3, harness side. Measure the voltage between the MAF sensor VREF circuit pin 4, harness side and MAF PWR GND pin 3, harness side. IS THE VOLTAGE GREATER THAN 10.5 VOLTS BETWEEN PINS 2 AND 3 AND IS THE VOLTAGE APPROXIMATELY 5.5 TO 6.5 VOLTS BETWEEN PINS 4 AND 3? Yes No Go to J5. REPAIR the circuit in question. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J5 CHECK MAF SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM body harness electrical connector. Measure the resistance between MAF sensor harness connector signal circuit pin 5 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to J6. REPAIR short to ground in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J6 CHECK MAF SENSOR SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between MAF sensor harness connector signal circuit pin 5 and PCM body harness connector pin 42. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to J7. REPAIR open in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J7 CHECK MAF SENSOR CIRCUITS NOTE: This step may cause DTC P0103 to set. Reconnect the PCM body harness electrical connector. Key on, engine off. Access MAF VOLT PID. Record MAF VOLT PID reading. Install a jumper wire between the MAF signal circuit pin 5 and the MAF VPWR circuit pin 2. DOES THE MAF PID CHANGE FROM LESS THAN 0.04 VOLT TO GREATER THAN 4.5 VOLTS? Yes No INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J8 DIAGNOSTIC TROUBLE CODE (DTC) P0103 NOTE: Refer to the PCM connector pin numbers, see scheme 21 and see scheme 22, at the beginning of this pinpoint test. Possible causes: restricted inlet air flow water intrusion MAF signal circuit shorted to power open ground circuit MAF sensor PCM Disconnect air inlet and check for restrictions and water intrusion. IS A CONCERN PRESENT? Yes No REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to J9.
J9 INDUCE OPPOSITE FAILURE Disconnect the MAF sensor electrical connector. Perform the KOER On-Demand Self-Test. IS DTC P0102 PRESENT? Yes No RESTORE the vehicle. CLEAR DTCs. Go to J12. Go to J10.
J10 CHECK MAF SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the PCM body harness electrical connector. Measure the voltage between MAF sensor signal circuit pin 5 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLT? Yes No Go to J11. REPAIR short to voltage in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J11 CHECK MAF RETURN CIRCUITS FOR AN OPEN Key off. Measure the resistance between MAF sensor harness connector signal return circuit pin 1 and PCM body harness connector pin 33; and between the MAF sensor harness connector pin 4 and PCM body harness connector pin 21. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
J12 CHECK THE MAF SIGNAL TO THE PCM Access the MAF PID. Key on, engine running. Monitor and record the MAF PID voltage at idle. Increase the engine speed to 2,500 RPM. Record the MAF PID voltage. IS THE MAF PID VOLTAGE BETWEEN 1.4 TO 1.8 VOLTS AT IDLE AND 1.9 TO 2.1 VOLTS AT 2,500 RPM? Yes No UNABLE to duplicate condition. Concern may have set due to water intrusion. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. INSTALL a new MAF sensor. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.

K1 PRELIMINARY DIAGNOSIS FOR DTCs P0117, P0118 Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform On-Demand Self Test. ARE DTCS P0117 OR P0118 PRESENT? Yes No For DTC P0117, Go to K2. For DTC P0118, Go to K4. Unable to duplicate condition. CHECK for loose connection, damaged or corroded pins. WIGGLE harness attempting to recreate the fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
K2 DIAGNOSTIC TROUBLE CODE (DTC) P0117 Possible causes: ECT signal circuit ground short ECT sensor PCM induce opposite DTC Disconnect ECT harness connector. Perform KOEO On-Demand Self Test. IS DTC P0118 PRESENT? Yes No INSTALL a new ECT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to K3.
K3 CHECK ECT SIGNAL CIRCUIT FOR A SHORT TO GROUND Disconnect the PCM engine harness connector. Measure the resistance between the ECT harness connector pin 2 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST system. REPAIR short to ground in the ECT signal circuit. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.
K4 DIAGNOSTIC TROUBLE CODE (DTC) P0118 NOTE: Refer to the PCM and component connector pin numbers, see scheme 23 and see scheme 24, at the beginning of this pinpoint test. Possible causes: short to voltage in the ECT signal circuit open in signal return circuit ECT sensor PCM Key off. Disconnect the ECT electrical connector. Measure the resistance between ECT electrical connector pin 1 and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to K5. REPAIR open in ECT return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
K5 INDUCE OPPOSITE FAILURE Key on, engine off. Install a jumper between pins 1 and 2, of the ECT electrical connector. Perform KOEO On-Demand Self Test. IS DTC P0117 PRESENT? Yes No INSTALL a new ECT sensor. CLEAR DTCs and RETEST the system. Go to K6.
K6 CHECK ECT SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Disconnect the PCM engine harness electrical connector. Measure the voltage on ECT electrical connector pin 2 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to K7. REPAIR short to voltage in the ECT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
K7 CHECK ECT SIGNAL CIRCUIT FOR AN OPEN Key off. Measure the resistance between the PCM engine harness connector pin 32 and ECT harness connector pin 2. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to K8. REPAIR open in the ECT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
K8 CHECK ECT SIGNAL RETURN CIRCUIT FOR AN OPEN Measure the resistance between PCM engine harness connector pin 25 and ECT sensor harness connector pin 1. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in ECT signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

KA1 PRELIMINARY DIAGNOSIS Key off. Perform a visual inspection. Key on, engine off (KOEO) Retrieve and record any continuous and on-demand DTCs. ARE ANY DTCS PRESENT? Yes No For DTC P0299, P0478, P132B, P2262 or P2263, Go to KA2 . For all other DTCs, REFER to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) . Go to KA2 .
KA2 CHECK THE MANIFOLD ABSOLUTE PRESSURE (MAP) SIGNAL ACCURACY NOTE: Route the pressure gauge hose to the passenger compartment so it is not crimped and does not come in contact with any hot surface. Inspect the MAP sensor hose and manifolds for damage, leaks, restrictions, and correct routing. Disconnect the MAP sensor pressure hose from the sensor. Install the pressure test adapter kit 014-00761 0-30 psi gauge between the MAP sensor and the pressure hose. Access the PCM and monitor the MGP and EOT PIDs. Allow the EOT to reach 70°C (158°F) and road test the vehicle. DOES THE MGP PID MATCH THE ACTUAL GAUGE PRESSURE? Yes No Go to KA3 . Go to «PinPoint Test E: Manifold Absolute Pressure (MAP) Sensor, Analog»(ref-225542-S42840599522011011700000) .
KA3 CHECK THE ICP SENSOR FOR BIAS Key on, engine off. Access the ICP PID. IS THE ICP PID VOLTAGE BETWEEN 0.18 AND 0.24 VOLTS (EARLY BUILD) OR 0.15 AND 0.35 (LATE BUILD)? Yes No Go to KA4 . INSTALL a new ICP sensor.
KA4 CHECK FOR INPUT SENSOR BIAS Access the BARO, EGR_DC, EBP, MAF and MAP PIDs. Refer to «REFERENCE VALUES - 6.0L DIESEL»(ref-225544) for normal operating values. ARE THE BARO, EGR_DC, EBP, MAF AND MAP PIDS WITHIN SPECIFICATIONS AND IS THE EBP PID VALUE WITHIN 10.34 KPA (1.5 PSI) OF THE MAP AND BARO PID VALUES? Yes No Go to KA5 . REFER to the appropriate pinpoint test to continue sensor diagnostics.
KA5 CHECK THE TURBOCHARGER OPERATION BOOST NOTE: Additional DTCs may set during the use of output control (OSC). Clear all the PCM and transmission control module (TCM) DTCs after the diagnostics are completed. Repeat the self-test to verify all DTCs are cleared. Key ON, engine running. Access the PCM and monitor the MGP, EGR_DC, RPM and VGTDC PIDs. Access the PCM and control the EGRDC, RPM_DSD, and VGTDC PIDs. Increase the commanded engine speed to 1,200 RPM using output state control. The calibration may limit the actual RPM between 1,150 and 1,200 RPM. Decrease the EGR duty cycle to 0%. Decrease the VGT duty cycle to 0%. Record the MGP PID value. Increase the VGT duty cycle to greater than 85%. Record the MGP PID value. Decrease the VGT duty cycle to 0%. Record the MGP PID value. IS THE MGP PID BELOW 3 KPA (0.44 PSI) AT 0% VGT DUTY CYCLE AND ABOVE 6 KPA (.87 PSI) AT 85% VGT DUTY CYCLE? Yes No Go to KA6 . Go to KA7 .
KA6 CHECK THE TURBOCHARGER OPERATION BACK PRESSURE Key ON, engine running. Access the PCM and monitor the, EBP_G, EGR_DC, RPM and VGTDC PIDs. Access the PCM and control the EGRDC, RPM_DSD, and VGTDC PIDs. Increase the commanded engine speed to 1,250 RPM using output state control. The calibration may limit the actual RPM between 1,150 and 1,200 RPM. Decrease the EGR duty cycle to 0%. Decrease the VGT duty cycle to 0%. Record the EBP_G PID. Increase the VGT duty cycle to greater than 85%. Record the EBP_G PID. Decrease the VGT duty cycle to 0%. Record the EBP_G PID. IS THE EBP_G PID BELOW 5 KPA (0.73 PSI) AT 0% VGT DUTY CYCLE AND ABOVE 50 KPA (7.3 PSI) AT 85% VGT DUTY CYCLE? Yes No Go to KA8 . Go to KA7 .
KA7 CHECK THE CHARGE AIR COOLER, AIR INTAKE AND EXHAUST SYSTEMS FOR LEAKS Key in OFF position. Disconnect the hose from the EP sensor. Plug the exhaust pipe. Connect the Rotunda Smoke Machine, Fuel Evaporative Emission System Tester 218-00001 (522) or equivalent to the EP hose. Fill the exhaust system with smoke. Pressurize the exhaust system with 20 psi regulated air. Disconnect the hose from the MAP sensor. Inspect the MAP sensor hose and manifolds for damage, leaks, restrictions, and correct routing. Connect the Rotunda Smoke Machine, Fuel Evaporative Emission System Tester 218-00001 (522) or equivalent to the MAP hose. Fill the air intake system with smoke. Pressurize the air intake system with 20 psi regulated air. Check the air intake and exhaust systems for leaks. ARE ANY LEAKS PRESENT? Yes No REPAIR the leaks. REFER to «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000) if a driveability concern exists. CLEAR the DTCs. REPEAT the self-test. Go to KA9 .
KA8 CHECK THE VGT ACTUATOR STABILITY NOTE: This test may cause a misfire or rough idle condition. Apply the parking brake. Place the transmission in PARK or NEUTRAL. Turn the A/C and defroster OFF. Key ON, engine running. Clear the PCM DTCs. Access the PCM and monitor the IPR, EBP, MGP, EGR_DC, and VGTDC PIDs. Access the PCM and control the EGRDC PID. Decrease the EGR duty cycle to 0%. Allow the IPR to stabilize. Slowly press the accelerator pedal and hold for 5 seconds at each of the following RPMs: 1500 RPM 1800 RPM 2000 RPM 2200 RPM 2500 RPM 2800 RPM DO THE VGTDC, MGP, AND EBP PIDS REMAIN STEADY AT ALL OF THE RPMS? Yes No The turbocharger system is operating correctly. REFER to «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000) . CLEAR the DTCs. REPEAT the self-test. Go to AK7 .
KA9 CHECK THE OPERATION OF THE VGT ACTUATOR CAUTION: The VGT actuator valve is sensitive to contamination. All work areas must be clean before starting this procedure. Do not allow contamination to enter the valve ports, cam follower, or turbocharger housing. Handle the VGT actuator by the solenoid body only. Do not attempt to clean or wipe oil off the valve at this time. Do not let the valve come in contact with materials that could contaminate the valve mechanism. Key in OFF position. VGT Actuator connector disconnected. Remove the VGT actuator from the turbocharger assembly. VGT Actuator connector connected. Key ON, engine OFF. Access the PCM and control the VGTDC PID. Apply light pressure to the cam follower (tip of the actuator), while commanding the VGT duty cycle and check for the internal valve movement. Increase the VGT duty cycle to greater than 70%. IS ANY INTERNAL VALVE CAM FOLLOWER MOVEMENT PRESENT WHEN THE VGT DUTY CYCLE IS INCREASED? Yes No Go to KA10 . Go to AK2 .
KA10 CHECK THE VGT VANE OPERATION Key in OFF position. Install the VGT actuator in the turbocharger assembly. Remove the pipe plug from the top of the VGT actuator housing, located near the oil supply tube. Apply an index mark on the internal valve cam follower (tip of the actuator). Key ON, engine running. Access the PCM and control the VGTDC PID. Increase the VGT duty cycle from 20% to greater than 85%. Check the internal valve cam follower for movement at each step while increasing the duty cycle. IS ANY INTERNAL VALVE CAM FOLLOWER MOVEMENT PRESENT IN EACH STEP WHEN THE VGT DUTY CYCLE IS INCREASED? Yes No The turbocharger system is operating correctly. REFER to «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000) . CLEAR the DTCs. REPEAT the self-test. INSTALL a new turbocharger assembly. refer to the appropriate FUEL CHARGING AND CONTROLS article.

L1 PRELIMINARY DIAGNOSIS FOR DTCs P0196, P0197, P0198, P1184, P0298 Perform visual inspection. Connect the scan tool. Retrieve and record any continuous and on-demand DTCs. Clear all DTCs. Perform the KOEO On-Demand Self-Test. Perform the KOER On-Demand Self-Test for DTC P0196. ARE DTCS P0196, P0197, P0198, P1184, P0298 PRESENT? Yes No For P0196, Go to L2. For P0197, Go to L7. For P0198, Go to L9. For P1184, Go to L13. For P0298, Go to L19. Fault correct. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L2 DIAGNOSTIC TROUBLE CODE (DTC) P0196 DTC P0196 indicates that an EOT sensor range/performance fault has been detected. P0196 is set when the vehicle has been driven above 1,250 rpm and 12 mg/stroke MFDES without EOT sensor signal increasing above 50°C (122° F). The time to set the fault is dependent on EOT and IAT temperatures, and can vary between approx. 15 to 45 minutes. Possible causes: EOT sensor EOT sensor circuitry thermostat PCM Inspect EOT sensor circuitry at sensor and PCM. Inspect for damaged, loose or pushed-out pins, loose or poorly crimped wires. ARE ALL CONNECTORS AND TERMINALS OK? Yes No Go to L3. REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L3 CHECK FOR EOT SENSOR FAULT CODES Perform KOEO On-Demand Self-Test. ARE OTHER DTCS PRESENT? Yes No REPAIR other DTCs before proceeding. RESTORE vehicle and RETEST the system. Only P0196 present, Go to L4.
L4 CHECK EOT SENSOR OPERATION NOTE: Verify no accessories are in use (engine block or oil heaters) Clear all DTCs. Soak vehicle at ambient temperature for at least 10 hours. Key on, engine off. Using scan tool, monitor EOT, RPM and MFDES PIDs. Record EOT sensor temperature reading. Drive vehicle above 1,800 rpm and 15 mg/stroke MFDES for at least 15 minutes. Select appropriate gear to achieve operating conditions. DOES EOT TEMPERATURE READING CHANGE BY AT LEAST 10°F OF KEY ON VALUE RECORDED? Yes No Go to L5. INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L5 COOLING SYSTEM CHECK Drive vehicle an additional 15 minutes above 1,800 rpm and 15 mg/stroke. DOES EOT TEMPERATURE READING INCREASE ABOVE 50°C (122°F)? Yes No Go to L6. CHECK thermostat for correct operation. If fault is indicated, INSTALL a new thermostat. If thermostat fault is not present, INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L6 CONFIRM PCM FAULT Check continuous memory DTCs. IS P0196 PRESENT? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539).
L7 DIAGNOSTIC TROUBLE CODE (DTC) P0197 NOTE: Refer to the PCM and component connector pin numbers, see scheme 25 and see scheme 26, at the beginning of this pinpoint test. Possible causes: EOT signal circuit short to ground EOT sensor PCM EOT electrical connections Key off. Disconnect EOT sensor. Check for damaged, pushed-out or corroded pins. Check for opposite failure with EOT disconnected. Perform the KOEO On-Demand Self-Test. IS DTC P0198 PRESENT? Yes No INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to L8.
L8 CHECK EOT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM engine harness connector. Measure the resistance between the EOT sensor harness connector pin 2 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to ground in EOT signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L9 DIAGNOSTIC TROUBLE CODE (DTC) P0198 NOTE: Refer to the PCM and component connector pin numbers, see scheme 25 and see scheme 26, at the beginning of this pinpoint test. Possible causes: open or short to voltage in EOT signal circuit open in signal return circuit poor connections EOT sensor PCM Key off. Disconnect EOT sensor harness connector. Disconnect the PCM engine harness connector. Measure the resistance between pin 1 on the EOT connector and the PCM engine harness connector pin 25. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to L10. REPAIR open in signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L10 INDUCE OPPOSITE FAILURE Connect the PCM engine harness connector Key on, engine off. Install a jumper between pins 1 and 2 of the EOT sensor electrical connector. Perform the On-Demand Self-Test. IS DTC P0197 PRESENT? Yes No INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to L11.
L11 CHECK SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness electrical connector. Key on, engine off. Measure the voltage on the EOT sensor electrical connector pin 2 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLT? Yes No Go to L12. REPAIR short to voltage in signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L12 CHECK SIGNAL CIRCUIT FOR AN OPEN Key off. Measure the resistance between the PCM engine harness connector pin 44 and the EOT sensor harness connector pin 2. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L13 DIAGNOSTIC TROUBLE CODE (DTC) P1184 DTC P1184 indicates that the engine oil temperature is not within the required range to perform the KOER Cylinder Contribution Self-Test. The engine oil temperature must be between 20°C (68°F) and 117°C (242°F). Possible causes: engine not fully warmed up low oil level cooling system failure EOT sensor thermostat EOT sensor circuit Verify no KOEO DTCs are present. Drive vehicle until thermostat opens. Fully warm engine. Check that upper radiator hose is hot and pressurized. Rerun the KOER Cylinder Contribution Self-Test. IS DTC P1184 PRESENT? Yes No Go to L14. REPAIR other DTCs as necessary. RESTORE the vehicle.
L14 EOT SENSOR CHECK Key on, engine off. Engine at normal operating temperature. Access EOT PID. Observe EOT PID while tapping on EOT sensor. DOES THE EOT VALUE FLUCTUATE OR GO BELOW 20°C (68°F) (3.82 VOLTS)? Yes No INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to L15.
L15 VEHICLE HARNESS CHECK Observe EOT PID while carrying out the following: Grasp the vehicle harness close to the EOT sensor connector. Wiggle and shake vehicle harness while working toward PCM. Key off. DOES VALUE FLUCTUATE? Yes No REPAIR circuits as required. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to L16.
L16 CHECK PCM AND VEHICLE HARNESS CONNECTOR Disconnect EOT sensor and PCM harness connectors. Inspect for damaged, loose or pushed-out pins. ARE CONNECTORS AND TERMINALS OK? Yes No Go to L17. REPAIR as required. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L17 CHECK FOR BIASED EOT SENSOR NOTE: Verify no accessories are in use (engine block or oil heaters) Allow vehicle to sit overnight. Do not start engine. Read EOT and IAT using scan tool with KOEO. DO THE READINGS AGREE WITHIN 6°C (11°F)? Yes No CONFIRM performance concern. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) or «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000). CONFIRM wiring is OK. If OK, INSTALL a new EOT.
L19 DIAGNOSTIC TROUBLE CODE (DTC) P0298 DTC P0298 indicates that an EOT sensor range/performance fault has been detected. P0298 is set when the vehicle has been running below 1,000 rpm and less than 20 mg/stroke MFDES with EOT sensor signal reading above 110°C (230°F). The time to set the fault is dependent on EOT and IAT temperatures, and can vary between approx. 15 to 45 minutes. Possible causes: EOT sensor EOT sensor circuitry cooling system thermostat PCM Inspect EOT sensor circuitry at sensor and PCM. Inspect for damaged, loose or pushed-out pins, loose or poorly crimped wires. ARE ALL CONNECTORS AND TERMINALS OK? Yes No Go to L20. REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L20 COOLING SYSTEM CHECKS Check coolant system for correct level. Check radiator for correct performance. Verify there are no obstructions to airflow across radiator core, and that the radiator core is not plugged. Verify correct cooling fan/clutch operation. Verify correct thermostat operation. IS COOLANT SYSTEM OK? Yes No Go to L21. REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L21 CHECK EOT SENSOR FAULT CODES Perform KOEO On-Demand Self-Test. ARE OTHER DTCS PRESENT? Yes No REPAIR other DTCs before proceeding. RESTORE vehicle and RETEST the system. Only P0298 present, Go to L22.
L22 CHECK EOT SENSOR OPERATION NOTE: Verify no accessories are in use (engine block or oil heaters) Clear continuous DTCs. Soak vehicle at ambient temperature for at least 8 hours. Key on, engine off. Using scan tool, monitor EOT PID. IS EOT SENSOR EQUAL TO AMBIENT TEMPERATURE? Yes No Go to L23. INSTALL a new EOT sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
L23 CONFIRM PCM FAULT Run engine for approximately 15 to 20 minutes. Check continuous memory DTCs. IS DTC P0298 PRESENT? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. OPERATE vehicle to VERIFY EOT does not increase above 110°C (230°F) while running below 1,000 rpm. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539).

M1 PRELIMINARY DIAGNOSIS FOR DTCS P0230, P0231, AND P0232 NOTE: For F-SuperDuty/Excursion, the fuel pump relay is internal to the central junction box (CJB). Retrieve and record all DTCs. Record freeze frame data. Clear the DTCs. Perform the On-Demand Self-Test. ARE ANY DTCS RETRIEVED? Yes No For DTC P0230 (F-SuperDuty/Excursion), Go to M2 . For DTC P0230 (E-Series), Go to M3 . For P0231, Go to M8 . For P0232, Go to M14 . UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
M2 DIAGNOSTIC TROUBLE CODE (DTC) P0230 Possible causes: fuel pump relay (internal to CJB) circuitry PCM Key off. Disconnect CJB C270f. Key on, engine off. Measure the voltage between CJB C270f pin 10, component side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to M5 . INSTALL a new CJB.
M3 CHECK THE FUEL PUMP RELAY VOLTAGE CIRCUIT NOTE: REFER to the appropriate SYSTEM WIRING DIAGRAMS article for PCM relay coil pin locations. Possible causes: fuel pump relay circuitry PCM Key off. Disconnect the fuel pump relay. Key on, engine off. Measure the voltage between the fuel pump relay coil power circuit, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to M4 . REPAIR the circuit.
M4 CHECK THE FUEL PUMP RELAY Perform the fuel pump relay component test. REFER to the appropriate COMPONENT TESTING article. DOES THE FUEL PUMP RELAY PASS THE COMPONENT TEST? Yes No Go to M5 . INSTALL a new fuel pump relay.
M5 CHECK THE FUEL PUMP RELAY CONTROL CIRCUIT FOR AN OPEN NOTE: REFER to the appropriate SYSTEM WIRING DIAGRAMS for fuel pump relay coil pin locations. Key off. Disconnect the PCM body harness connector. Measure the resistance between the CJB C270f pin 10 (F-SuperDuty/Excursion) or the fuel pump relay coil control circuit (E-Series), harness side and the PCM body harness connector pin 5, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to M6 . REPAIR the circuit.
M6 CHECK THE FUEL PUMP RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the PCM body harness connector pin 5, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to M7 . REPAIR the circuit.
M7 CHECK THE FUEL PUMP RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the PCM body harness connector pin 5, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. INSTALL a new PCM.
M8 DIAGNOSTIC TROUBLE CODE (DTC) P0231 NOTE: Diagnose and repair DTC P0230 before addressing DTC P0231. Possible causes: inertia switch fuel pump monitor circuit open fuel pump relay Key off. Disconnect the inertia switch. Measure the resistance between the inertia switch pin 1, component side and the inertia switch pin 3 (F-SuperDuty/Excursion) or pin 2 (E-Series), component side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to M9 . INSTALL a new inertia switch.
M9 CHECK THE FUEL PUMP VOLTAGE Connect a test lamp between the inertia switch pin 1 (F-SuperDuty/Excursion) or pin 2 (E-Series), harness side and ground. Key on, engine off. IS THE TEST LAMP ILLUMINATED FOR APPROXIMATELY 20 SECONDS? Yes No Go to M13 . For F-SuperDuty/Excursion, Go to M10 . For E-Series, Go to M11 .
M10 CHECK THE FUEL PUMP VOLTAGE CIRCUIT FOR AN OPEN Key off. Disconnect CJB C270a. Measure the resistance between CJB C270a pin 22, harness side and the inertia switch pin 1, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new CJB. REPAIR the circuit.
M11 CHECK THE FUEL PUMP RELAY POWER CIRCUIT FOR VOLTAGE Key off. Disconnect the fuel pump relay. Key on, engine off. Measure the voltage between the fuel pump relay power circuit pin 30, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to M12 . REPAIR the circuit.
M12 CHECK THE FUEL PUMP RELAY Perform the fuel pump relay component test. REFER to the appropriate COMPONENT TESTING article. DOES THE FUEL PUMP RELAY PASS THE COMPONENT TEST? Yes No REPAIR the circuit. INSTALL a new fuel pump relay.
M13 CHECK THE FUEL PUMP MONITOR CIRCUIT FOR AN OPEN Key off. Disconnect the PCM. Measure the resistance between the inertia switch pin 3 (F-SuperDuty/Excursion) or pin 1 (E-Series), harness side and the PCM body harness connector pin 19, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
M14 DIAGNOSTIC TROUBLE CODE (DTC) P0232 NOTE: Diagnose and repair DTC P0230 before addressing DTC P0232. Possible causes: fuel pump relay fuel pump monitor circuit open or short to voltage fuel pump ground circuit open fuel pump Key off. Disconnect central junction box (CJB) C270a (F-SuperDuty/Excursion). Disconnect the fuel pump relay (E-Series). Key on, engine off. IS THE FUEL PUMP ON? Yes No Go to M15 . Go to M16 .
M15 CHECK THE FUEL PUMP MONITOR CIRCUIT A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness connector. Disconnect the fuel pump. Key on, engine off. Measure the voltage between the PCM body harness connector pin 19, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. CLEAR the DTCs and RETEST the system. If the DTC P0232 is present again, INSTALL a new PCM.
M16 CHECK THE FUEL PUMP GROUND FOR AN OPEN Key off. Disconnect the fuel pump. Measure the resistance between the fuel pump ground pin 2, harness side and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to M17 REPAIR the circuit.
M17 CHECK THE FUEL PUMP Measure the resistance between the fuel pump pin 1, component side and the fuel pump pin 2, component side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to M18 INSTALL a new fuel pump.
M18 CHECK THE FUEL PUMP MONITOR CIRCUIT AN OPEN Disconnect the PCM body harness connector. Measure the resistance between the PCM body harness connector pin 19, harness side and the fuel pump pin 1, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No For E-Series, Go to M19 . For F-SuperDuty/Excursion, Go to M20 . REPAIR the circuit.
M19 CHECK THE FUEL PUMP RELAY Perform the fuel pump relay component test. REFER to the appropriate COMPONENT TESTING article. DOES THE FUEL PUMP RELAY PASS THE COMPONENT TEST? Yes No CLEAR the DTCs and RETEST the system. If the DTC P0232 is present again, INSTALL a new PCM. INSTALL a new fuel pump relay.
M20 CHECK THE CJB FUEL PUMP RELAY Reconnect CJB C270a. Connect a 5 amp fused jumper wire between the PCM body harness connector pin 5 harness side, and ground. Measure the voltage between the PCM body connector pin 19 harness side, and ground. Key on, engine off. IS THE VOLTAGE GREATER THAN 10 VOLTS WITH THE JUMPER INSTALLED AND IS THE VOLTAGE LESS THAN 1 VOLT WITH THE JUMPER REMOVED? Yes No CLEAR the DTCs and RETEST the system. If the DTC P0232 is present again, INSTALL a new PCM. INSTALL a new CJB. CLEAR the DTCs and RETEST the system.

O1 PRELIMINARY DIAGNOSIS FOR DTC P2269 Perform visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform On-Demand Self Test. IS DTC P2269 PRESENT? Yes No Go to O2. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
O2 DIAGNOSTIC TROUBLE CODE (DTC) P2269 NOTE: Refer to the PCM and component connector pin numbers, see scheme 33 and see scheme 34, at the beginning of this pinpoint test. Possible causes: water in the fuel filter housing shorted circuit damaged connection WIF sensor PCM Route a hose from the fuel drain line, located on the fuel control module, to a 1-qt clear container. Open the fuel control module drain valve and close the drain valve when you have filled the container. DOES THE CONTAINER HAVE ANY WATER OR CONTAMINANTS? Yes No CLEAR DTCs and RETEST the system. If WIFIL comes back on and DTC P2269 returns, REPEAT Test Step O2. If water is still found in fuel sample, FLUSH and CLEAN the fuel tank and fuel system. Go to O3.
O3 CHECK WIF SENSOR CIRCUIT FOR SHORT TO GROUND Key on, engine off. Disconnect the WIF sensor harness connector. Clear Continuous DTCs. Cycle ignition key. Retrieve Continuous DTCs. Key off. DID DTC P2269 RESET? Yes No Go to O4. Go to O5.
O4 CHECK FOR SHORT TO GROUND IN THE SIGNAL CIRCUIT Disconnect PCM body harness connector. Measure resistance between pin 2 on WIF sensor harness connector and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR short to ground in WIF sensor circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
O5 CHECK WIF SENSOR Remove the fuel filter, and inspect inside of the filter housing for foreign material. IS DEBRIS FOUND INSIDE THE HOUSING? Yes No CLEAN out filter housing. REMOVE WIF sensor. CLEAN and REINSTALL. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new WIF sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

P1 PRELIMINARY DIAGNOSIS Perform a visual inspection. Retrieve and record any continuous and on-demand DTCs. Clear the DTCs. Perform the Injector Electrical Self-Test (Click Test). Refer to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538) . ARE ANY DTCS RETRIEVED? Yes No For DTCs P0261, P0264, P0267, P0270, P0273, P0276, P0279 or P0282, Go to P2 . Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. For DTCs P0262, P0265, P0268, P0271, P0274, P0277, P0280 or P0283, Go to P4 . For DTCs P0301, P0302, P0303, P0304, P0305, P0306, P0307 or P0308, Go to P7 . For DTCs P0263, P0266, P0269, P0272, P0275, P0278, P0281 or P0284, Go to P15 .
P2 DIAGNOSTIC TROUBLE CODES (DTCs) P0261, P0264, P0267, P0270, P0273, P0276, P0279 OR P0282 Possible causes: open circuit coil to coil short fuel injector FICM connector loose FICM Key off. Disconnect the suspect fuel injector. Visually inspect the suspect injector pins. Measure the resistance between the suspect fuel injector pins, component side as follows: Pins 1 and 2 - 0.2 to 3.0 ohms Pins 3 and 4 - 0.2 to 3.0 ohms Pins 1 and 3 - greater than 10,000 ohms Pins 1 and 4 - greater than 10,000 ohms Pins 2 and 3 - greater than 10,000 ohms Pins 2 and 4 - greater than 10,000 ohms ARE THE RESISTANCES WITHIN SPECIFICATIONS? Yes No Go to P3 . INSTALL a new fuel injector.
P3 CHECK THE FUEL INJECTOR CIRCUITS FOR AN OPEN Disconnect the FICM. Measure the resistance between the suspect fuel injector pins 1, 2, 3 and 4, harness side and the FICM connector pins, harness side. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No INSTALL a new FICM. REPAIR the circuit in question.
P4 DIAGNOSTIC TROUBLE CODES (DTCs) P0262, P0265, P0268, P0271, P0274, P0277, P0280 OR P0283 Possible causes: circuit short to voltage circuit short to ground fuel injector FICM Key off. Disconnect the suspect fuel injector to induce opposite DTC. Perform the Injector Electrical Self-Test. IS DTC P0261, P0264, P0267, P0270, P0273, P0276, P0279 OR P0282 INDICATED? Yes No INSTALL a new fuel injector. Go to P5 .
P5 CHECK THE FUEL INJECTOR CIRCUITS FOR A SHORT TO GROUND Key off. Disconnect the FICM. Measure the resistance between the suspect injector pins 1, 2, 3 and 4, harness side and ground. ARE THE RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to P6 . REPAIR the circuit in question.
P6 CHECK THE FUEL INJECTOR CIRCUITS FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the suspect injector pins 1, 2, 3 and 4, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit in question. INSTALL a new FICM.
P7 CHECK FOR CONTINUOUS MEMORY FAULT DTCs Check for continuous memory DTCs. ARE DTCS P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308 PRESENT? Yes No Visually inspect for valve train, piston or any other base engine concerns. REPAIR as necessary. REFER to the appropriate ENGINE article. If OK, REFER to the «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000) to continue diagnostics. Go to P8 .
P8 PERFORM KOEO SELF-TEST AND INJECTOR ELECTRICAL SELF-TEST Perform the KOEO and Injector Electrical self-tests. ARE ANY DTCS PRESENT? Yes No Go to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) . Go to P9 .
P9 CHECK FOR KOER CODES Perform the KOER self-test. ARE ANY DTCS PRESENT? Yes No Go to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) . Go to P10 .
P10 CHECK FUEL PRESSURE Check the fuel system pressure. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS THE FUEL PRESSURE WITHIN SPECIFICATION? Yes No Go to P11 . REPAIR as necessary.
P11 CHECK FOR FUEL AERATION Perform the Fuel Aeration Test. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS THE FUEL AERATED? Yes No REPAIR as necessary. Go to P12 .
P12 CHECK FOR OIL AERATION Perform the Oil Aeration Test. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS THE OIL AERATED? Yes No CHANGE the oil and RETEST. If the oil is aerated, REPAIR as necessary. REFER to the appropriate ENGINE . Go to P13 .
P13 PERFORM THE INJECTOR ENHANCED DIAGNOSTICS Perform Injector Interrupt for Enhanced Diagnostics. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS A WEAK CYLINDER IDENTIFIED? Yes No If all four cylinders on one bank are identified, CHECK the following: Oil rail check valve for restriction Fuel inlet check valve FICM Compression/head gaskets Fuel contamination If individual cylinders are identified, CHECK the following: Go to P14 CHECK THE CRANKCASE PRESSURE . If multiple or individual cylinders are identified, CHECK the following: Dual mass flywheel If individual cylinders are identified, CHECK the following: Wiring to injector (should have already been seen with code) Injector hold-down bolt tightness Injector copper gasket presence Faulty injector If the two rear cylinders are identified on either bank as weak, CHECK the following: AWA fitting in oil rail Compression/head gasket Any individual cylinder concern can be seen in the conditions listed above. If any two adjacent cylinders are identified as weak, CHECK the following: Compression/head gasket
P14 CHECK THE CRANKCASE PRESSURE Perform the Crankcase Pressure Test. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS THE CRANKCASE PRESSURE ABOVE SPECIFICATION? Yes No REPAIR as necessary. REFER to the appropriate ENGINE article. INSTALL a new PCM.
P15 DTCs P0263, P0266, P0269, P0272, P0275, P0278, P0281 OR P0284 Perform the Crankcase Pressure Test. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . Perform a cylinder compression test on the suspect cylinder. ARE ANY CONCERNS PRESENT? Yes No REPAIR as necessary. REFER to the appropriate ENGINE article. Go to P16 .
P16 PERFORM A VISUAL INSPECTION Perform a visual inspection for the following mechanical concerns: pushrods rocker arms valves valve springs ARE ANY OF THE ABOVE CONCERNS PRESENT? Yes No REPAIR as necessary. REFER to the appropriate ENGINE article. Go to P17 CHECK THE FUEL SYSTEM PRESSURE .
P17 CHECK THE FUEL SYSTEM PRESSURE Check the fuel system pressure. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . IS THE FUEL PRESSURE WITHIN SPECIFICATION? Yes No Inspect the fuel injector and O-rings. If the fuel injector and O-rings are OK, INSTALL a new fuel injector. REPAIR as necessary.

Q1 PRELIMINARY DIAGNOSIS Perform a visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the Key On Engine Off Self-Test. ARE ANY DTCS RETRIEVED? Yes No For DTC P2285, Go to Q2 . Go to Q12 . For DTC P2286, Go to Q6 . For DTC P2287 only, Go to Q13 .
Q2 DIAGNOSTIC TROUBLE CODE (DTC) P2285 NOTE: DTC P2285 indicates the injector control signal circuit out of range low was detected during the KOEO Self-Test or during continuous diagnostic monitoring. Possible causes: ICP signal circuit open ICP disconnected ICP signal circuit shorted to ground VREF circuit open biased ICP sensor ICP sensor PCM Key off. Disconnect the ICP sensor. Key on. Measure the voltage between the ICP sensor VREF circuit pin B, harness side and ground. IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No Go to Q3 . Go to Q10 .
Q3 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM. Measure the resistance between ICP sensor signal circuit pin C, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to Q4 . REPAIR the circuit.
Q4 CHECK THE SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between the ICP sensor signal circuit pin C, harness side and the PCM engine connector pin 29, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to Q5 . REPAIR the circuit.
Q5 CHECK THE ICP SENSOR NOTE: This step may set DTC P2286. Reconnect the PCM. Key on, engine off. Access the ICP PID. Connect a 5A fused jumper between the ICP sensor signal circuit pin C, harness side and the ICP sensor VREF circuit pin B, harness side. IS THE ICP PID VOLTAGE READING APPROXIMATELY 4.0 TO 5.5 VOLTS? Yes No INSTALL a new ICP sensor. INSTALL a new PCM.
Q6 DIAGNOSTIC TROUBLE CODE (DTC) P2286 Possible causes: signal circuit shorted to power SIGRTN circuit open PCM ICP sensor Disconnect the ICP sensor to induce the opposite DTC. Perform the Key On Engine Off self-test. IS DTC P2285 PRESENT? Yes No INSTALL a new ICP sensor. Go to Q7 .
Q7 CHECK THE ICP SENSOR SIGNAL FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM. Key on, engine off. Measure the voltage between the ICP sensor signal circuit pin C, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. Go to Q8 .
Q8 CHECK THE ICP SIGRTN CIRCUIT FOR AN OPEN Key off. Measure the resistance between the ICP sensor SIGRTN circuit pin A, harness side and the PCM engine connector pin 25, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
Q10 CHECK THE VREF CIRCUIT FOR AN OPEN Key off. Disconnect the PCM. Measure the resistance between the ICP sensor VREF circuit pin B, harness side and the PCM engine connector pin 36, harness side. IS RESISTANCE LESS THAN 5 OHMS? Yes No Go to Q11 . REPAIR the circuit.
Q11 CHECK THE VREF CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the ICP sensor VREF circuit pin B, harness side and ground. IS RESISTANCE GREATER THAN 10, 000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
Q12 ICP SENSOR BIAS CHECK NOTE: Verify engine oil temperature (EOT) is greater than 82°C (180°F). Key on, engine off. Access the ICP PID. IS THE ICP PID VOLTAGE BETWEEN 0.18 AND 0.24 VOLTS (EARLY BUILD) OR 0.15 AND 0.35 (LATE BUILD)? Yes No REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. INSTALL a new ICP sensor.
Q13 ICP SENSOR INTERMITTENT CHECK Visually inspect the ICP sensor harness and connector for damage, corrosion, or incorrect routing. Access the ICP PID. While monitoring the ICP PID, wiggle, shake, and bend small sections of the wiring harness while working from the sensor to the PCM. IS THERE ANY CHANGE IN THE ICP PID VALUE, OR IS A CONCERN PRESENT? Yes No REPAIR as necessary. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

Scheme 86

Scheme 86: Introduction

R1 PRELIMINARY DIAGNOSIS FOR DTC P2623 NOTE: DTC will not set during crank mode. Perform a visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform the On-Demand Self Test. IS DTC P2623 PRESENT? Yes No Go to R2. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exist.
R2 CHECK THE IPR SOLENOID RESISTANCE NOTE: Refer to the PCM and component connector pin numbers, see scheme 40 and see scheme 41, at the beginning of this pinpoint test. Key off. Disconnect the IPR. Measure the resistance between the IPR solenoid pin 1, component side and the IPR solenoid pin 2, component side. IS THE RESISTANCE BETWEEN 3.0 AND 15.0 OHMS? Yes No Go to R3. INSTALL a new IPR.
R3 CHECK THE IPR SYSTEM VOLTAGE Key on, engine off. Measure the voltage between the IPR solenoid VPWR circuit pin 1, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to R4. REPAIR the circuit.
R4 CHECK THE IPR CONTROL CIRCUIT FOR A SHORT TO POWER Key off. Disconnect the PCM engine harness connector. Key on. Measure the voltage between the IPR solenoid control circuit pin 2, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit Go to R5.
R5 CHECK THE IPR CONTROL CIRCUIT FOR A SHORT TO GROUND Key off. Measure the resistance between the IPR solenoid control circuit pin 2, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to R6. REPAIR the circuit.
R6 CHECK THE IPR CONTROL CIRCUIT FOR AN OPEN Measure the resistance between the PCM engine harness connector pin 2, harness side and the IPR solenoid control circuit pin 2, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.

S1 PRELIMINARY DIAGNOSIS FOR DTCs P0611, P1378 AND P1379 Perform a visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform the On-Demand Self-Test. IS DTC P1378 OR P1379 PRESENT? Yes No For DTC P1378, Go to S2. For DTC P1379, Go to S7. For DTC P0611 only, Go to S8.
S2 DIAGNOSTIC TROUBLE CODE (DTC) P1378 NOTE: Refer to the PCM and component connector pin numbers, see scheme 42 and see scheme 43, at the beginning of this pinpoint test. Possible causes: fuse loose connection open circuit relay short to ground charging system fault Check fuse (15 amp). IS FUSE OK? Yes No Go to S3. INSTALL a new fuse. If fuse blows, REPAIR short in logic circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
S3 CHECK FICM SUPPLY VOLTAGE CIRCUIT Key off. Disconnect the FICM electrical connector C. Connect a 10-amp fused jumper between the FICM electrical connector C pin 27 and ground. Key on. Measure the voltage between FICM electrical connector C pin 8 and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. refer to the appropriate GENERATORS AND REGULATORS article. Go to S4.
S4 CHECK FICM VOLTAGE CIRCUIT FOR AN OPEN Key off. Remove the FICM relay. Key on. Measure the voltage at FICM relay connectors pin 2 and ground; and pin 3 and ground. ARE THE VOLTAGES GREATER THAN 10.5 VOLTS? Yes No Go to S5. REPAIR open in circuit to FICM relay. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
S5 CHECK FICM RELAY CIRCUIT FOR AN OPEN Key off. Measure the resistance between FICM relay connector pin 5 and FICM electrical connector C pin 8. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to S6. REPAIR open in circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
S6 CHECK FICM RELAY CONTROL CIRCUIT FOR AN OPEN Measure the resistance between the FICM relay connector pin 1 and the FICM electrical connector C pin 27. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new FICM relay. RESTORE the vehicle. CLEAR the DTCs and RETEST the system. REPAIR open in circuit. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.
S7 DIAGNOSTIC TROUBLE CODE (DTC) P1379 DTC P1379 indicates the FICM supply voltage high. Possible causes: charging system alternator Clear all DTCs. Carry out the On-Demand Self-Test. IS DTC P1379 PRESENT? Yes No Refer to the appropriate GENERATORS AND REGULATORS article for charging system diagnostics. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539).
S8 CHECK THE FICM POWER RELAY Carry out the FICM power relay component test. REFER to the appropriate COMPONENT TESTING article. DOES THE FICM POWER RELAY PASS THE COMPONENT TEST? Yes No Go to S9. INSTALL a new FICM relay. CLEAR the DTCs. REPEAT the self-test.
S9 CHECK THE FICM SUPPLY VOLTAGE Key OFF. Disconnect the FICM harness connector C. Connect the FICM power relay. Key ON, engine OFF. Measure the voltage between the FICM connector C pins 4, 23, 24 and 25, harness side and ground. ARE THE VOLTAGES GREATER THAN 10.5 VOLTS? Yes No INSTALL a new FICM. CLEAR the DTCs. REPEAT the self-test. REPAIR the open circuit. CLEAR the DTCs. REPEAT the self-test.

V1 PRELIMINARY DIAGNOSIS FOR DTCs P0340, P0341, P2614 NOTE: Some DTCs require that the engine go through more than one key cycle to set. NOTE: DTCs P2617 and P2614 may set simultaneously after an engine stalling event. NOTE: DTC P2614 is calibrated to an increment counter. To set the DTC requires more than 5 consecutive fault events in the crank mode or 10 fault events in the run mode. Perform the required number of key cycles from RUN to START to RUN (cycling to OFF will reset timer) and then perform the KOEO or KOER self-test. Perform a visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the On-Demand Self-Test. ARE ANY DTCS RETRIEVED? Yes No For P0340, P0341 or P2614, Go to V2. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) to diagnose a no-start condition.
V2 DIAGNOSTIC TROUBLE CODES (DTCs) P0340, P0341 OR P2614 NOTE: Refer to the PCM and component connector pin numbers, see scheme 44, see scheme 45 and see scheme 46, at the beginning of this pinpoint test. Possible causes: CMP circuit open CMP circuit short to ground CMP circuit short to power signal circuit open signal circuit shorted PCM CMP sensor DOES THE ENGINE START? Yes No Go to V3. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) to diagnose a no-start. CLEAR DTCs and RETEST the system.
V3 ATTEMPT TO REGENERATE DTCs Clear all DTCs. Start the engine. Increase RPM to greater than 1,500 RPM for 10 seconds. Repeat two times. Key on, engine off. Perform On-Demand Self-Test. IS DTC P0340, P0341 OR P2614 PRESENT? Yes No Go to V4. CHECK for a loose connection. REPAIR as necessary. CHECK pins for damage or corrosion. CLEAR DTCs and RETEST the system.
V4 CHECK THE RESISTANCE OF THE CMP SENSOR CIRCUITS Key off. Disconnect the PCM engine harness connector. Measure the resistance between PCM engine harness connector pin 31 and pin 43. IS THE RESISTANCE BETWEEN 800 AND 1,000 OHMS? Yes No Go to V5. Go to V7.
V5 CHECK FOR INTERMITTENT SHORT Connect the PCM engine harness connector. Connect the scan tool. Key on, engine off. Select the CMP sensor fault PID. Monitor PID while wiggling the harness. IS A FAULT PRESENT? Yes No REPAIR the circuit. CLEAR DTCs and RETEST the system. For DTCs P0340 or P0341, Go to V6. For DTC P2614, Go to V9.
V6 CONFIRM PCM FAULT Key on. Clear all DTCs. Perform On-Demand Self-Test. ARE DTCS P0340 AND P0341 PRESENT? Yes No INSTALL a new PCM. CLEAR DTCs and RETEST the system. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539).
V7 CHECK CMP SENSOR CIRCUITS Disconnect the CMP sensor. Inspect the CMP sensor connector for damaged or corroded pins. Measure the resistance between PCM harness connector pin 31 and ground; and between pin 43 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to V8. REPAIR short in CMP sensor circuits. CLEAR DTCs and RETEST the system.
V8 CHECK CMP CIRCUITS FOR AN OPEN Measure the resistance between PCM engine harness connector pin 31 and CMP sensor harness connector pin 1; and between PCM engine harness connector pin 43 and CMP sensor harness connector pin 2. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new CMP sensor. CLEAR DTCs and RETEST the system. REPAIR open circuit. CLEAR DTCs and RETEST the system.
V9 CHECK CAMSHAFT POSITION SIGNAL FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Disconnect the FICM harness connector C3. Key on, engine off. Measure the voltage between FICM harness connector C3 pin 10 and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR short to voltage. CLEAR DTCs and RETEST the system. Go to V10.
V10 CHECK CAMSHAFT POSITION SIGNAL FOR A SHORT TO GROUND Key off. Measure the resistance between FICM harness connector C3 pin 10 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to V11. REPAIR short to ground in the camshaft output signal circuit. CLEAR DTCs and RETEST the system.
V11 CHECK CAMSHAFT POSITION SIGNAL FOR AN OPEN Measure the resistance between FICM harness connector C3 pin 10 and PCM engine harness connector pin 20. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to V12. REPAIR open in the camshaft signal output circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
V12 CHECK THE CMP SENSOR Remove the CMP sensor. Visually inspect the sensor for damage, misalignment and improper installation. IS A CONCERN PRESENT? Yes No REPAIR as necessary. CLEAR the DTCs and RETEST the system. INSTALL a new PCM. CLEAR DTCs and RETEST the system.

W1 PRELIMINARY DIAGNOSIS FOR DTCS P0401, P0402, P0403, P0404, P0405, P0406, P1335 Perform visual inspection. Connect the scan tool. Retrieve and record any continuous and on-demand DTCs. Record freeze frame data. Clear all DTCs. Perform On-Demand Self Test. ARE ANY DTCS RETRIEVED? Yes No For P0401, Go to W2. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. For P0402, Go to W2. For P0403, Go to W4. For P0404 or P1335, Go to W9. For P0405, Go to W10. For P0406, Go to W14.
W2 DIAGNOSTIC TROUBLE CODE (DTC) P0401, P0402 NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (air filter, exhaust system, intake system, performance chip, turbocharger, etc.). Refer to Diesel Electronic Engine Control (EC) System, «MODIFICATIONS TO OBD VEHICLES»(ref-225536-S36718124042006031800000). NOTE: Refer to the PCM and component connector, see scheme 47 and see scheme 48, at the beginning of this pinpoint test. Possible causes: restricted air flow (intake or exhaust) charge air cooler (CAC) system leaks (hoses/cooler) EGR valve stuck or sticking EGR valve O-rings restricted EGR cooler EGR valve position sensor bias EP sensor bias Perform On-Demand Self Test. ARE OTHER DTCS PRESENT? Yes No REPAIR all other DTCs before diagnosing DTC P0401 or P0402. Go to W3.
W3 CHECK EGR VALVE OPERATION NOTE: Additional DTCs may set during the utilization of output state control (OSC). Clear all PCM and TCM DTCs after diagnostics have been performed. Repeat the self-test to verify all DTCs have been cleared. NOTE: EGR valve override control with the engine running is 75% maximum duty cycle. With the KOEO, duty cycle can be controlled to 100%. Access the EP, EGRVPDES, EGRDC and EGRVP PIDS. Record readings. Start engine. Activate Output State Control for the EGR valve. Monitor EP while increasing and decreasing EGRDC. DOES EP READING INDICATE EGR VALVE MOVEMENT? Yes No CLEAR DTCs and RETEST the system. If other DTCs are present, Go to the appropriate pinpoint test. If a driveability concern is present or DTC P0401 or P0402 is present, REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540), Performance Testing of EGR System. INSTALL a new EGR valve. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W4 DIAGNOSTIC TROUBLE CODE (DTC) P0403 NOTE: Refer to the PCM and component connector, see scheme 47 and see scheme 48, at the beginning of this pinpoint test. Possible causes: open in control circuit control circuit shorted to voltage control circuit shorted to ground EGR actuator PCM Disconnect the EGR actuator electrical harness connector. Key on. Measure the voltage between EGR actuator valve harness connector pin E and ground. IS THE VOLTAGE ABOVE 11.0 VOLTS? Yes No Go to W5. REPAIR open in VPWR circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W5 CHECK EGR ACTUATOR CONTROL VALVE CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Key on. Measure the voltage between EGR actuator valve harness connector pin A and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to W6. REPAIR short to voltage. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W6 CHECK EGR ACTUATOR CONTROL VALVE CIRCUIT FOR A SHORT TO GROUND Key off. Measure the resistance between EGR actuator valve harness connector pin A and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to W7. REPAIR short to ground. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W7 CHECK EGR CONTROL CIRCUIT FOR AN OPEN Measure the resistance between EGR actuator harness connector pin A and PCM engine harness connector pin 23. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to W8. REPAIR open in control circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W8 CHECK EGR ACTUATOR Measure the resistance between EGR actuator (component side) pins A and E. IS THE RESISTANCE BETWEEN 4.0 AND 10.0 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new EGR actuator. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W9 DIAGNOSTIC TROUBLE CODE (DTC) P0404 OR P1335 NOTE: DTC P1335 is set when the EGR closed position voltage is greater than 1.20 volts at initial key on. Possible causes: EGR valve PCM ARE OTHER DTCS PRESENT? Yes No REPAIR other DTCs before diagnosing DTC P0404 or P1335. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540). PERFORM the EGR Position Test. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W10 DIAGNOSTIC TROUBLE CODE (DTC) P0405 NOTE: Refer to the PCM and component connector, see scheme 47 and see scheme 48, at the beginning of this pinpoint test. Possible causes: position signal circuit shorted to ground position signal circuit open actuator PCM Disconnect the EGR actuator valve electrical connector. Key on. Measure the voltage between EGR harness connector pin D and pin B. IS THE VOLTAGE BETWEEN 4.5-5.5 VOLTS? Yes No Go to W11. REPAIR open in VREF or signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W11 CHECK EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM engine harness connector. Measure the resistance between EGR harness connector pin C and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to W12. REPAIR short to ground in position signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W12 CHECK EGR POSITION SIGNAL CIRCUIT FOR AN OPEN Measure the resistance between PCM engine harness connector pin 33, and EGR actuator connector pin C. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to W13. REPAIR open in EGR position signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W13 CHECK EGR INTERNAL CIRCUITS FOR AN OPEN OR SHORT Measure the resistance of EGR (component) internal circuits. Pins B and C: 50-2,500 ohms Pins C and D: 2,000-7,000 ohms Pins B and D: 3,000-7,000 ohms ARE ALL MEASUREMENTS WITHIN RANGE? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new EGR actuator. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W14 DIAGNOSTIC TROUBLE CODE (DTC) P0406 NOTE: Refer to the PCM and component connector, see scheme 47 and see scheme 48, at the beginning of this pinpoint test. Possible causes: position signal shorted to voltage open in signal return circuit sensor PCM Induce opposite failure. Disconnect EGR actuator harness connector. Perform On-Demand Self Test. IS DTC P0405 PRESENT? Yes No INSTALL a new EGR actuator. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to W15.
W15 CHECK EGR POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Key on. Measure the voltage between EGR actuator connector pin C and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to W. REPAIR short to voltage in EGR position signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
W16 CHECK EGR POSITION SIGNAL CIRCUIT SIGNAL RETURN FOR AN OPEN Key off. Reconnect PCM. Measure the resistance between EGR harness connector pin B and PCM engine connector pin 25. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

X1 PRELIMINARY DIAGNOSIS FOR DTCS P0470, P0471, P0472 OR P0473 NOTE: Diagnose and repair EP sensor circuit fault DTCs before addressing range/performance concerns. Perform a visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record the freeze frame data. Clear the DTCs. Perform the key on engine off (KOEO) self-test. Perform the key on engine running (KOER) self-test. ARE DTCS P0470, P0471, P0472 OR P0473 PRESENT? Yes No For KOEO DTC P0470, Go to X2 . Go to X19 . For continuous DTC P0470, Go to X60 . For DTC P0471, Go to X8 . For DTC P0472, Go to X12 . For DTC P0473, Go to X16 .
X2 DIAGNOSTIC TROUBLE CODE (DTC) P0470 Possible causes: EP sensor SIG RTN circuit open or shorted to ground PCM Key on, engine off. Access the EP PID. IS THE EP PID LESS THAN 127 KPA (18.5 PSI)? Yes No CLEAR the DTC. REPEAT the KOEO On-Demand Self-Test. If DTC P0470 is present again, Go to X12 . Go to X3 . If no DTCs are present, CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if driveability concerns exist.
X3 CHECK THE EP SENSOR PRESSURE Access the EP, MAP, and BARO PIDs. Refer to «REFERENCE VALUES - 6.0L DIESEL»(ref-225544) for normal operating values. IS THE EP PID VALUE WITHIN 10.34 KPA (1.5 PSI) OF THE MAP AND BARO PID VALUES? Yes No Go to X5 . Go to X4 .
X4 CHECK THE SIGNAL RETURN CIRCUIT Key off. Disconnect the EP sensor. Disconnect the PCM engine harness connector. Measure the resistance between the EP sensor SIG RTN circuit pin A, harness side and the PCM engine harness connector pin 25, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new EP sensor. REPAIR the circuit.
X5 CHECK THE EP SENSOR CAUTION: Using air pressure greater than 69 kPa (10 psi) may damage the EP sensor. Remove the EP sensor. Check for contamination, restrictions or carbon build-up in the EP sensor port, mounting bracket or tube. Repair as necessary. Check for moisture in the EP sensor port. If moisture is present, use 69 kPa (10 psi) regulated air pressure to remove the moisture. Connect the EP sensor connector. Connect the PCM connector. Key ON, engine OFF. Access the BARO, EP, and MAP PIDs. Refer to «REFERENCE VALUES - 6.0L DIESEL»(ref-225544) for normal operating values. IS THE EP PID VALUE WITHIN 10.34 KPA (1.5 PSI) OF THE MAP AND BARO PID VALUES? Yes No UNABLE to duplicate the condition. CHECK for a loose connection, and damaged or corroded terminals. WIGGLE the harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if driveability concerns exist. INSTALL a new EP sensor. CLEAR the DTCs. REPEAT the self-test.
X6 CONTINUOUS DIAGNOSTIC TROUBLE CODE (DTC) P0470 Possible causes: EP sensor PCM Access the EP PID. Observe the EP PID while carrying out the following: Grasp the vehicle harness close to the EP sensor connector. Wiggle and shake the vehicle harness while working toward the PCM. Key off. DOES THE EP PID READING FLUCTUATE? Yes No ISOLATE the intermittent connection. REPAIR as necessary. Go to X7 .
X7 INSPECT THE EP SENSOR AND PCM CONNECTORS Disconnect the EP sensor. Inspect the EP sensor connector and terminals. Inspect the PCM connectors. ARE ALL THE CONNECTIONS OK? Yes No Unable to duplicate condition. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. REPAIR as necessary.
X8 DIAGNOSTIC TROUBLE CODE (DTC) P0471 NOTE: Visually inspect the vehicle for aftermarket accessories and performance modifications (exhaust system, turbocharger, performance chip, etc.). REFER to Diesel Electronic Engine Control (EC) System, «MODIFICATIONS TO OBD VEHICLES»(ref-225536-S36718124042006031800000) . Possible causes: EP sensor EP sensor supply tube plugged or restricted PCM Perform the KOER self-test. If other DTCs are present, repair before continuing. REFER to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) . Access the EP PID. Road test the vehicle performing hard accelerations while monitoring the EP PID. IS THE EP INCREASE GREATER THAN 25 PSI ? Yes No Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if driveability concerns exist. Go to X9 .
X9 INSPECT FOR EXHAUST LEAKS Inspect the turbo pipe and exhaust manifolds for leaks. ARE ANY EXHAUST LEAKS PRESENT? Yes No REPAIR the exhaust leak. Go to X10 .
X10 CHECK THE EP SENSOR SUPPLY TUBE Inspect the EP sensor supply tube. IS THE EP SENSOR TUBE RESTRICTED OR PLUGGED? Yes No INSTALL a new EP sensor tube. Go to X11 .
X11 EP SENSOR CHECK Disconnect the EP sensor. Install the ICP/EBC Adapter Cable D94T-50-A or equivalent between the EP sensor and vehicle harness. Key on, engine running. Measure the voltage between the EP signal circuit and ground on ICP/EBC Adapter Cable D94T-50 -A. Accelerate the engine to wide open throttle (WOT) several times. IS THE VOLTAGE GREATER THAN 1.35 VOLTS DURING ACCELERATION? Yes No CLEAR the DTC. REPEAT the self-test. If DTC P0471 is present again, INSTALL a new PCM. INSTALL a new EP sensor.
X12 DIAGNOSTIC TROUBLE CODE (DTC) P0472 Possible causes: EP sensor signal circuit open biased sensor EP sensor signal circuit shorted to ground VREF circuit open EP sensor PCM Key off. Disconnect the EP sensor. Key on, engine off. Measure the voltage between the EP sensor VREF circuit pin B, harness side and ground. IS THE VOLTAGE BETWEEN 4.5 AND 5.5 VOLTS? Yes No Go to X13 . REPAIR the circuit.
X13 CHECK THE EP SENSOR Access the EP PID. Connect a 5A fused jumper wire between the EP sensor VREF circuit pin B, harness side and the EP sensor signal circuit pin C, harness side. IS THE EP PID VOLTAGE APPROXIMATELY 4.5 TO 5.5 VOLTS? Yes No INSTALL a new EP sensor. Go to X14 .
X14 CHECK THE SIGNAL CIRCUIT FOR AN OPEN Key off. Disconnect the PCM engine harness connector. Measure the resistance between the EP sensor signal circuit pin C, harness side and the PCM engine harness connector pin 27, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to X15 . REPAIR the circuit.
X15 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the EP sensor signal circuit pin C, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
X16 DIAGNOSTIC TROUBLE CODE (DTC) P0473 Possible causes: EP signal shorted to voltage SIG RTN circuit open EP sensor PCM Induce the opposite DTC. Disconnect the EP sensor. Key on, engine off. Perform the KOEO On-Demand Self-Test. IS DTC P0472 PRESENT? Yes No INSTALL a new EP sensor. Go to X17 .
X17 CHECK THE EP SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Key on, engine off. Measure the voltage between the EP sensor signal circuit pin C, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. Go to X18 .
X18 CHECK THE EP SENSOR SIG RTN CIRCUIT FOR AN OPEN Key off. Measure the resistance between the EP sensor SIG RTN circuit pin A, harness side and the PCM engine harness connector pin 25, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
X19 CHECK THE EP SENSOR BIAS Key on, engine off. Access the MAP, BARO and EP sensor PIDs. IS THE EP PRESSURE WITHIN +/- 3% OF MAP AND BARO PRESSURE? Yes No CHECK the EP sensor and tube for blockage or restrictions. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. INSTALL a new EP sensor.

Y1 DIAGNOSTIC TROUBLE CODES (DTCs) P0565, P0566, P0567, P0568, AND P0569 NOTE: When performing the key on engine running (KOER) self-test, wait five seconds after beginning the test before operating the speed control switches. DTCs P0565, P0566, P0567, P0568 and P0569 are set if the PCM does not detect a switch change of state during the KOER self-test. Possible causes: speed control switch not pressed during self-test signal circuit open or shorted signal return circuit open open in horn relay control circuit speed control switches clockspring PCM Access the SCCS PID. Key on, engine off. No switches pressed. DOES THE PID INDICATE NONE? Yes No Go to Y2 . Go to Y5 .
Y2 CHECK THE ON SWITCH Press the ON switch. DOES THE PID INDICATE ON? Yes No Go to Y3 . Go to Y9 .
Y3 CHECK THE OFF SWITCH Press the OFF switch. DOES THE PID INDICATE OFF? Yes No Go to Y4 . Go to Y13 .
Y4 CHECK THE COMMAND SWITCHES Press the RESUME, COAST and SET/ACCEL switches. DOES THE PID INDICATE CORRECTLY? Yes No CLEAR the DTCS. REPEAT the KOER self-test. If the DTC is present again, INSTALL a new PCM. INSTALL a new speed control switch. Refer to the appropriate SPEED CONTROL article.
Y5 CHECK THE SPEED CONTROL SWITCHES Key off. Disconnect the airbag. Refer to the appropriate AIRBAG RESTRAINT SYSTEM article. Disconnect the speed control switch. Key on, engine off. Access the SCCS PID. DOES THE PID INDICATE NONE? Yes No INSTALL a new speed control switch. Refer to the appropriate SPEED CONTROL article. Go to Y6 .
Y6 CHECK THE CLOCKSPRING Key off. Disconnect the clockspring. Key on, engine off. Access the SCCS PID. DOES THE PID INDICATE NONE? Yes No INSTALL a new clockspring. Refer to the appropriate SPEED CONTROL article. If the PID indicates ON, Go to Y7 . If the PID indicates OFF, Go to Y8
Y7 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness connector. Key on, engine off. Measure the voltage between the PCM body harness connector pin 31, harness and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. INSTALL a new PCM.
Y8 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM body harness connector. Measure the resistance between PCM body harness connector pin 31, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
Y9 CHECK THE HORN OPERATION Check the horn operation. DOES THE HORN OPERATE CORRECTLY? Yes No Go to Y10 . Refer to the appropriate HORN article.
Y10 CHECK THE SPEED CONTROL SWITCH OPERATION Key off. Disconnect the clockspring. For F-SuperDuty/Excursion, measure the resistance between the clockspring speed control signal circuit pin 3, component side and the clockspring horn relay control circuit pin 4, component side while pressing the ON switch. For E-Series, measure the resistance between the clockspring speed control signal circuit pin 4, component side and the clockspring horn relay control circuit pin 1, component side while pressing the ON switch. IS THE RESISTANCE LESS THAN 5 OHMS WITH THE SWITCH PRESSED? Yes No Go to Y11 . Go to Y12 .
Y11 CHECK THE SIGNAL CIRCUIT FOR AN OPEN Disconnect the PCM body harness connector. Measure the resistance between the clockspring speed control signal circuit pin 3 (F-SuperDuty/Excursion) or pin 4 (E-Series), harness side and the PCM body harness connector pin 31, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
Y12 CHECK THE SPEED CONTROL SWITCH FOR AN OPEN Disconnect the airbag. Refer to the appropriate AIRBAG RESTRAINT SYSTEM article. Disconnect the speed control switch. For F-SuperDuty/Excursion, measure the resistance between the speed control switch signal circuit pin 3, component side and the speed control switch horn relay control circuit pin 4, component side while pressing the ON switch. For E-Series, measure the resistance between the speed control switch signal circuit pin 4, component side and the speed control switch horn relay control circuit pin 1, component side while pressing the ON switch. IS THE RESISTANCE LESS THAN 5 OHMS WITH THE SWITCH PRESSED? Yes No INSTALL a new clockspring. Refer to the appropriate SPEED CONTROL article. INSTALL a new speed control switch. Refer to the appropriate SPEED CONTROL article.
Y13 CHECK THE SPEED CONTROL SWITCH SIGNAL RETURN CIRCUIT Key off. Disconnect the clockspring. For F-SuperDuty/Excursion, measure the resistance between the clockspring signal circuit pin 3, component side and the clockspring signal return circuit pin 6, component side while pressing the OFF switch. For E-Series, measure the resistance between the clockspring signal circuit pin 4, component side and the clockspring signal return circuit pin 2, component side while pressing the OFF switch. IS THE RESISTANCE LESS THAN 5 OHMS WITH THE SWITCH PRESSED? Yes No Go to Y15 . Go to Y14 .
Y14 CHECK THE SPEED CONTROL SWITCH Disconnect the airbag. Refer to the appropriate AIRBAG RESTRAINT SYSTEM article. Disconnect the speed control switch. For F-SuperDuty/Excursion, measure the resistance between the speed control switch signal circuit, component side and the speed control switch signal return circuit, component side while pressing the OFF switch. For E-Series, measure the resistance between the speed control switch signal circuit, component side and the speed control switch signal return circuit, component side while pressing the OFF switch. IS THE RESISTANCE LESS THAN 5 OHMS WITH SWITCH PRESSED? Yes No INSTALL a new clockspring. Refer to the appropriate SPEED CONTROL article. INSTALL a new speed control switch. Refer to the appropriate SPEED CONTROL article.
Y15 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN Disconnect the PCM body harness connector. Measure the resistance between the clockspring speed control signal return circuit pin 6 (F-SuperDuty/Excursion) or pin 2 (E-Series), harness side and the PCM body harness connector pin 24, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.

Z1 PRELIMINARY DIAGNOSIS FOR DTC P0603 Possible causes: battery or PCM previously disconnected battery cables loose or poor connections battery discharged open or short to ground in the KAPWR circuit PCM reprogramming or reflash PCM Key on, engine off. Clear the DTCs. Cycle the ignition switch off and on. Perform the self-test. IS DTC P0603 PRESENT? Yes No Go to Z2 . Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) for driveability concerns.
Z2 CHECK THE CHARGING SYSTEM Check the battery and charging system. Refer to the appropriate GENERATORS AND REGULATORS article. IS A CONCERN PRESENT? Yes No REPAIR as necessary. Refer to the appropriate GENERATORS AND REGULATORS article. Go to Z3 .
Z3 CHECK THE KAPWR CIRCUIT FOR VOLTAGE Key off. Disconnect the PCM body harness connector. Measure the voltage between the PCM body harness connector pin 40, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. CLEAR the DTCs and REPEAT the self-test. If DTC P0603 is present again, INSTALL a new PCM. REPAIR the circuit.

AA1 DIAGNOSTIC TROUBLE CODE (DTC) P0605 DTC P0605 is set when a read only memory (ROM) failure is detected in the powertrain control module (PCM). Possible causes: internal PCM failure incorrect PCM calibration Perform the Key On Engine Off (KOEO) On-Demand Self-Test. IS DTC P0605 PRESENT? Yes No REFLASH the PCM. CLEAR the DTCs and REPEAT the self-test. If DTC P0605 is present again, INSTALL a new PCM. CLEAR the DTCs and REPEAT the selftest. System OK. CLEAR the DTCs and REPEAT the selftest.

AC1 DIAGNOSTIC TROUBLE CODE (DTC) P1000 NOTE: If power to the PCM is disconnected, P1000 will be set until the OBD II monitors have run and cleared. Diagnostic code P1000 indicates that operating conditions have not been satisfied for all of the OBD II monitors to run. Possible causes: drive conditions not satisfied KAM cleared damaged PCM Perform all self tests and check continuous codes. ARE DTCS OTHER THAN P1000 SET? Yes No REPAIR other DTCs according to appropriate pinpoint test before continuing. Go to AC2 .
AC2 PERFORM MANUFACTURER-SPECIFIED DIESEL DRIVE CYCLE Perform diesel drive cycle. Refer to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538) . IS P1000 CLEARED? Yes No No issue; DTC P1000 cleared. Go to AC3 .
AC3 VERIFY CERTAIN OPERATING CONDITIONS HAVE BEEN SATISFIED Using scan tool, monitor EOT, VPWR and GPTCM. If vehicle is started and EOT is below 55°C (131°F), VPWR must be between 11.5 V and 14 V until the glow plug duty cycle is 0%. Using scan tool, monitor MFDES and rpm at full load. MFDES must be above 37 MG/stroke for at least 12 seconds with rpm above 2300. Monitor MFDES at idle with vehicle warmed up. MFDES must be below 12 MG/stroke for at least 12 seconds. WITH THE ABOVE CONDITIONS MET, IS P1000 CLEARED? Yes No No issue; DTC P1000 cleared. COMPLETE all steps in «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) to determine DTC clearing issue.

AD1 CHECK FOR DTCs Connect the scan tool. Record any DTCs. Clear DTCs. Perform the On-Demand Self Test. ARE ANY DTCS PRESENT? Yes No Go to the appropriate DTC pinpoint test. Go to AD2 .
AD2 CHECK VEHICLE BATTERY POWER CIRCUIT Key off. Disconnect the PCM body harness connector. Key on. Measure voltage between the PCM body harness connector pin 34 and pin 46 and ground. Check for loose connections. Check for damaged pins or corrosion. Wiggle the harness while taking measurements. IS VOLTAGE PRESENT? Yes No Go to AD3 . REPAIR open in the circuit. RESTORE the vehicle. RETEST the system.
AD3 CHECK PCM POWER RETURN CIRCUIT Key off. Measure resistance between the PCM body harness connector pin 11 and pin 23 and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) . REPAIR open in power return circuit. RESTORE the vehicle. RETEST the system.

AE1 DIAGNOSTIC TROUBLE CODE (DTC) P1502 NOTE: Refer to the PCM and component connector pin numbers, see scheme 56 and see scheme 57, at the beginning of this pinpoint test. Verify that the correct procedure was used to activate KOEO or KOER Self Test for the scan tool. NOTE: Verify scan tool operation on another vehicle before proceeding. WAS THE CORRECT PROCEDURE USED? Yes No Correct procedure for activating self test was used. Go to AE2. REFER to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538) for correct operating procedures.
AE2 CHECK PCM OUTPUT NOTE: Scan tool will kick out if battery voltage drops below 9.5 volts. If carrying out repeated self testing, unplug glow plug relay to prevent the battery from going dead, and disregard glow plug codes while glow plug relay is unplugged. If equipped with auxiliary powertrain control system, it must be off or disconnected while trying to perform self test. Verify that batteries are fully charged and are not the cause of the communication error. DOES THE ENGINE START? Yes No Go to AE3. Go to AE7.
AE3 CHECK B+ AT DATA LINK CONNECTOR (DLC) Measure voltage at DLC pin 16 and ground. Key off. IS BATTERY VOLTAGE PRESENT? Yes No Go to AE4. REPAIR open in DLC B+ circuit. CLEAR DTCs and RETEST the system.
AE4 CHECK DLC CHASSIS GROUND CONTINUITY Measure resistance between the DLC pins 4, 5 and ground. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to AE5. REPAIR the circuit in question. CLEAR DTCs and RETEST the system.
AE5 CHECK DLC CAN (-) CIRCUIT FOR AN OPEN Key off. Disconnect the PCM body harness connector. Measure the resistance between the PCM body harness connector pin 14 and DLC connector pin 14. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AE6. REPAIR the open circuit. RETEST the system.
AE6 CHECK CAN (+) CIRCUIT FOR AN OPEN Measure the resistance between the PCM body harness connector pin 13 and DLC connector pin 6. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RETEST the system. REPAIR the open circuit. RETEST the system.
AE7 CHECK PCM GROUND CIRCUITS FOR CONTINUITY Key off. Disconnect the PCM body harness connector. Measure the resistance between PCM body harness connector pins 10, 11, 23 and ground. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to AE8. REPAIR the circuit in question. RETEST the system.
AE8 CHECK THE VREF CIRCUITS FOR A SHORT TO GROUND Disconnect the PCM engine harness connector. Measure the resistance between the PCM engine connector pin 36, harness side and ground. Measure the resistance between the PCM body connector pin 29, harness side and ground; and between the PCM body connector pin 45, harness side and ground. ARE THE RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to AE9. REPAIR the circuit in question. CLEAR the DTCs. RETEST the system.
AE9 CHECK THE PCM VPWR CIRCUITS FOR VOLTAGE Key on, engine off. Measure the voltage between the PCM body harness connector pins 34, 46 and ground. ARE THE VOLTAGES GREATER THAN 10 VOLTS? Yes No Go to AE10. Go to «PinPoint Test A: Vehicle Battery»(ref-225542-S23398647042006031800000).
AE10 CHECK THE PCM VBATT CIRCUIT FOR VOLTAGE Measure the voltage between the PCM body harness connector pin 40 and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No INSTALL a new PCM. CLEAR the DTCs. RETEST the system. REPAIR the circuit. CLEAR the DTCs. RETEST the system.

Glow Plug Monitor Self-Test

The Glow Plug Monitor Self-Test is a functional KOER self-test of the glow plug system. The PCM will activate the GPCM which monitors the glow plugs. A fault must be present at the time of testing to detect a fault. If the GPCM detects a fault, a message will be sent to the PCM through the diagnostic line and then transmitted to the scan tool.

Note. The accelerator pedal may be used to increase the engine RPM and maintain battery voltage during the self-test. Make sure that the vehicle batteries are fully charged prior to performing the Glow Plug Monitor Self-Test.

CAUTION

GPCM connectors are not interchangeable. The system will generate DTCs if the connectors are mismatched. Make sure the green harness connector is plugged into the green module connector and the black harness connector into the black module connector. There is a black stripe on the GPCM housing for visual verification. The stripe should line up with the black connector.

CAUTION

When disconnecting the green and black connectors at the GPCM it is suggested that the module be unbolted from the mounting bracket first and then the connectors disconnected. This will allow for easier disconnect and will prevent damage to the connector terminals.

CAUTION

The PCM harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no start condition. Installing the PCM connectors on an angle may cause an improper connection, misdiagnosis and damaged components. Install the connector until the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM and then fully seat the connector.

Note. Visually inspect the harness connectors for corrosion, damage, proper mating and correct pin tension.

Note. When the PCM is disconnected additional DTCs will be set. Clear all DTCs after restoring the vehicle.

This pinpoint test is intended to diagnose the following

glow plugs
glow plug bus bar
GPCM
PCM

GPCM Pin Number	Signal Name
GPCM Pin Number	GREEN Connector	BLACK Connector
1	Glow Plug #5	Glow Plug #6
2	Glow Plug #7	Glow Plug #8
3	VBATT, Glow Plug Power	VBATT, Glow Plug Power
6	Glow Plug #1	Glow Plug #2
7	Glow Plug #3	Glow Plug #4
8	Glow Plug Control	NOT CONNECTED
9	Diagnostic Communication	VPWR, GPCM Power

GPCM CONNECTOR PIN/SIGNAL IDENTIFICATION

AF1 PRELIMINARY DIAGNOSIS Key off. Perform a visual inspection. Key on, engine off. Perform the KOER Glow Plug Monitor Self-Test. Is DTC P0670, P0671, P0672, P0673, P0674, P0675, P0676, P0677, P0678 or P0683 present? Yes No NOTE: IF DTC P0670 and P0683 are present, perform DTC P0670 diagnostics before performing DTC P0683. Unable to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate the fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. For DTC P0671, P0672, P0673, P0674, P0675, P0676, P0677 or P0678Go to AF2. For DTC P0670, Go to AF8. For DTC P0683, Go to AF16.
AF2 DIAGNOSTIC TROUBLE CODES P0671, P0672, P0673, P0674, P0675, P0676, P0677 OR P0678 NOTE: Refer to the wiring diagram see scheme 58 at the beginning of this pinpoint test. NOTE: Glow plugs are numbered front to rear with even numbers on left side of engine. NOTE: Use the wiring diagram to match the connector pins with the DTCs. Possible causes: glow plug circuit open glow plug circuit shorted GPCM glow plug Key off. Disconnect the suspect glow plug bus bar. Check for loose, damaged or backed out terminals. Measure the resistance between the suspect glow plug bus bar pin, component side and ground. Is the resistance between 0.5 and 2 ohms? Yes No Go to AF4. Go to AF3.
AF3 CHECK THE GLOW PLUG CIRCUIT BETWEEN THE BUS BAR CONNECTOR AND THE GLOW PLUG Disconnect the bus bar harness from the glow plugs. Measure the resistance between the suspect glow plug bus bar pin, harness side and the suspect glow plug pin, harness side. Is the resistance less than 5 ohms? Yes No INSTALL a new glow plug. INSTALL a new bus bar.
AF4 CHECK THE GLOW PLUG VOLTAGE Disconnect the suspect GPCM connector. Key on, engine off. Measure the voltage between the GPCM connector VBATT circuit pin 3, harness side and ground. Is the voltage greater than 10 volts? Yes No Go to AF5. REPAIR the circuit.
AF5 CHECK THE GLOW PLUG CIRCUIT FOR AN OPEN Key off. Measure the resistance between the suspect glow plug GPCM connector pin, harness side and the glow plug bus bar pin, harness side. Is the resistance less than 5 ohms? Yes No Go to AF6. REPAIR the circuit.
AF6 CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the suspect glow plug GPCM connector pin, harness side and ground. Is the resistance greater than 10,000 ohms? Yes No Go to AF7. REPAIR the circuit.
AF7 CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the suspect glow plug GPCM connector pin, harness side and ground. Is any voltage indicated? Yes No REPAIR the circuit. INSTALL a new GPCM.
AF8 DIAGNOSTIC TROUBLE CODE P0670 NOTE: Refer to the PCM and component connector pin numbers, see scheme 58, at the beginning of this pinpoint test. Possible causes: control line open control line shorted to ground or power PCM GPCM Key off. Disconnect the PCM. Disconnect the GPCM (green connector). Measure the resistance between the green GPCM connector pin 8, harness side and the PCM engine harness connector pin 3, harness side. Is the resistance less than 5 ohms? Yes No Go to AF9. REPAIR the circuit.
AF9 CHECK THE CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the green GPCM connector pin 8, harness side and ground. Is the resistance greater than 10,000 ohms? Yes No Go to AF10. REPAIR the circuit.
AF10 CHECK THE CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the green GPCM connector pin 8, harness side and ground. Is any voltage indicated? Yes No REPAIR the circuit. Go to AF12.
AF12 CHECK THE GPCM FOR VOLTAGE Key off. Disconnect the GPCM (black connector). Key on, engine off. Measure the voltage between the black GPCM connector pin 9, harness side and ground. Is the voltage greater than 10 volts? Yes No Go to AF13. REPAIR the circuit in question.
AF13 CHECK THE GPCM CONTROL CIRCUIT Key off. Reconnect the GPCM connectors. Key on, engine off. Measure the voltage between the PCM engine harness connector pin 3, harness side and ground. Is the voltage greater than 10 volts? Yes No INSTALL a new PCM. INSTALL a new GPCM.
AF16 DIAGNOSTIC TROUBLE CODE P0683 NOTE: Refer to the PCM and component connector pin numbers, see scheme 58, at the beginning of this pinpoint test. Possible causes: diagnostic line open diagnostic line shorted to ground diagnostic line shorted to power PCM GPCM Key off. Disconnect the PCM. Disconnect the GPCM (green connector). Measure the resistance between the green GPCM connector pin 9, harness side and the PCM engine harness connector pin 17, harness side. Is the resistance less than 5 ohms? Yes No Go to AF17. REPAIR the circuit.
AF17 CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the green GPCM connector pin 9, harness side and ground. Is the resistance greater than 10,000 ohms? Yes No Go to AF18. REPAIR the circuit.
AF18 CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the green GPCM connector pin 9, harness side and ground. Is any voltage indicated? Yes No REPAIR the circuit. Go to AF19.
AF19 CHECK THE GPCM FOR VOLTAGE Key off. Disconnect the GPCM (black connector). Key on, engine off. Measure the voltage between black GPCM connector pin 9, harness side and ground. Is the voltage greater than 10 volts? Yes No Go to AF20. REPAIR the circuit.
AF20 CHECK THE GPCM OPERATION Key off. Reconnect the GPCM. Connect a 10A fused jumper wire between the PCM engine connector pin 3, harness side and ground. Key on, engine off. Measure the voltage between the PCM engine harness connector pin 17, harness side and ground. Is the voltage between 5 and 12 volts? Yes No INSTALL a new PCM. INSTALL a new GPCM.

AG1 PRELIMINARY DIAGNOSIS Perform visual inspection. Connect the scan tool. Retrieve and record any continuous and on-demand DTCs. Record freeze frame data. Clear all DTCs. Perform the KOEO On-Demand Self-Test. ARE ANY DTCS RETRIEVED? Yes No For DTC P2122, P2127, P2132: Go to AG2. For DTC P2123, P2128, P2133: Go to AG8. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539).
AG2 DIAGNOSTIC TROUBLE CODE (DTC) P2122/P2127/P2132 NOTE: Refer to the PCM and component connector pin numbers, see scheme 59, see scheme 60 and see scheme 61, at the beginning of this pinpoint test. Possible causes: APP not seated correctly APP sensor open in signal circuit signal circuit shorted to ground PCM Key on. Access PIDs APP1, APP2, APP3. Press the accelerator pedal while observing voltage reading on scan tool. Observe PID while pressing the accelerator pedal. DO ALL SIGNAL VALUES CHANGE WHEN THE ACCELERATOR IS PRESSED? Yes No Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539). Go to AG3.
AG3 CHECK VREF SENSOR CIRCUITS Key off. Disconnect the APP sensor C2040. Key on. Measure the voltage between the APP sensor C2040 pins, harness side as follows: Vehicle Pin Pin F-Super Duty / Excursion 4 9 E-Series 7 1 IS THE VOLTAGE BETWEEN 4.5-5.5 VOLTS? Yes No Go to AG4. REPAIR open in VREF or signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG4 CHECK SECONDARY VREF AND SIGNAL RETURN CIRCUITS Measure the voltage between the APP sensor C2040 pins, harness side as follows: Vehicle Pin Pin F-Super Duty / Excursion 5 10 E-Series 6 3 IS THE VOLTAGE BETWEEN 4.5-5.5 VOLTS? Yes No Go to AG5. REPAIR open in secondary VREF or signal return circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG5 CHECK APP SENSOR OPERATION Install a 5 amp fused jumper wire between the APP sensor C2040 pin 4 (F-Super Duty/Excursion) or pin 7 (E-Series), harness side and the suspect APP sensor circuit, harness side. Access APP PID values. IS THE VOLTAGE OF THE SUSPECT SIGNAL CIRCUIT BETWEEN 4.5-5.5 VOLTS? Yes No INSTALL a new APP sensor assembly. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to AG6.
AG6 CHECK APP SENSOR SIGNAL FOR AN OPEN Key off. Disconnect the PCM body harness connector. Measure the resistance of faulted signal circuit between the PCM body harness connector and APP harness connector. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AG7. REPAIR open in faulted APP signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG7 CHECK FAULTED APP SENSOR SIGNAL FOR A SHORT TO GROUND Measure the resistance of the faulted signal circuit between the APP harness connector and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR the DTCs and RETEST the system REPAIR short to ground in faulted APP signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG8 DIAGNOSTIC TROUBLE CODE (DTCs) P2123/P2128/P2133 NOTE: Refer to the PCM and component connector pin numbers, see scheme 59, see scheme 60 and see scheme 61, at the beginning of this pinpoint test. Possible causes: signal shorted to voltage signal return open APP sensor PCM Key on. Access APP PID volts. Slowly press the accelerator pedal while observing the voltage reading. DO ALL SIGNAL VALUES CHANGE WHEN THE ACCELERATOR IS PRESSED? Yes No Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539). Go to AG9.
AG9 INDUCE OPPOSITE FAILURE Key off. Disconnect the APP sensor electrical connector. Key on. Access APP PID volts. DO ALL PID SIGNAL VALUES READ 0 VOLTS? Yes No INSTALL a new APP sensor assembly. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to AG10.
AG10 CHECK APP SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM body harness electrical connector. Key on. Measure the voltage of faulted signal circuit between the APP harness connector and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to AG11. REPAIR short to voltage in faulted APP signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG11 CHECK APP SIGNAL CIRCUITS FOR A SHORT TO GROUND Key off. Measure the resistance of faulted signal circuit between the APP harness connector and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AG12. REPAIR short to ground in the faulted signal circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG12 CHECK APP SIGNAL RETURN CIRCUITS FOR AN OPEN Measure the resistances between the PCM connector, harness side and the APP sensor C2040, harness side as follows: RESISTANCE MEASUREMENT SPECIFICATIONS - AG12 Vehicle PCM Connector Pin APP Sensor Connector Pin F-Super Duty / Excursion C1381a 33 C2040 9 F-Super Duty / Excursion C1381a 20 C2040 10 E-Series C176a 33 C2040 1 E-Series C176a 20 C2040 3 ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. REPAIR open in signal return circuit in question. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG13 DIAGNOSTIC TROUBLE CODES (DTCs) P2138/P2139/P2140 NOTE: Refer to the PCM and component connector pin numbers, see scheme 59, see scheme 60 and see scheme 61, at the beginning of this pinpoint test. Possible causes: APP sensor PCM high circuit resistance Clear all DTCs. Perform the On-Demand Self-Test. ARE DTCS P2138, P2139 OR P2140 PRESENT? Yes No Go to AG14. If other DTCs are present, Go to the appropriate pinpoint test procedure. If no DTCs are present, attempt to recreate fault. ROAD TEST the vehicle. RERUN On-Demand Self-Test. If no DTCs are retrieved, RESTORE the vehicle. System OK.
AG14 CHECK ACCELERATOR PEDAL ASSEMBLY FOR BINDING Press the accelerator pedal slowly to the floor and release. DOES THE ACCELERATOR PEDAL MOVE TO THE FLOOR AND RETURN WITHOUT BINDING? Yes No Go to AG15. INSTALL a new APP sensor assembly. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AG15 CHECK APP SENSOR SIGNAL VOLTAGE RANGES Key on. Access and monitor APP sensor 1, 2, and 3 PIDs. Press the accelerator pedal slowly to the floor and release. PID VOLTAGE SPECIFICATIONS Pedal Position APP1 APP2 APP3 CT 3.92-4.17 1.37-1.62 0.82-1.07 WOT 0.53-0.78 3.93-4.18 3.38-3.63 ARE THE PID VOLTAGES WITHIN THE RANGE SPECIFIED IN THE Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. INSTALL a new APP sensor assembly. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

AH1 PRELIMINARY DIAGNOSIS Key off. Carry out the PCM self-test. ARE ANY DTCS PRESENT? Yes No For DTC P0480, Go to AH4 . Go to AH2 . For DTC P0528, Go to AH3 . For all other DTCs, REFER to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) .
AH2 CHECK THE COOLING FAN FOR MECHANICAL BINDING NOTE: The VDF is a viscous coupling. The viscous drag should be smooth during fan rotation. The amount of resistance is defendant upon the final VDF operational state before engine shutdown. Key off. Manually rotate the cooling fan. DOES THE FAN CLUTCH ROTATION FEEL ROUGH OR BINDING? Yes No INSTALL a new VDF. Refer to the appropriate ENGINE COOLING article. Go to AH3 .
AH3 CHECK THE VDF OPERATION NOTE: Check and verify the most current PCM calibration level. NOTE: Inherent to viscous clutches is a delay in transitioning from a low to a high speed or from a high to a low speed. This delay can vary between 10 seconds and 3 minutes and is defendant upon engine speed and clutch temperature. With the engine at operating temperature and at 2500 RPM, the delay should be less than 30 seconds. Key on, engine running. Access Output Test Mode. Access the FANSS and RPM PIDs. Increase the engine speed to 2500 RPM. Monitor the FANSS PID and the VDF duty cycle. Command the VDF to LOW. Allow the fan speed to stabilize below 600 RPM. Command the VDF duty cycle to HIGH. DOES THE FAN SPEED CHANGE AND DOES THE FANSS PID INDICATE AN RPM CHANGE? Yes No If the FANSS PID stabilizes at less than 2800 RPM with the engine speed at 2500 RPM, INSTALL a new VDF. Refer to the appropriate ENGINE COOLING article. If the fan speed did not change, Go to AH4 . If the FANSS PID stabilizes at greater than 2800 RPM with the engine speed at 2500 RPM, the system is operating correctly. If the fan speed did change and the FANSS PID did not indicate an RPM change, Go to AH12 . For cooling system concerns, refer to the appropriate ENGINE COOLING article for diagnosis and testing.
AH4 CHECK THE VDF SOLENOID RESISTANCE Key off. Disconnect the VDF. Measure the resistance between the VDF solenoid VPWR circuit pin 5, component side and the VDF solenoid control circuit pin 4, component side. IS THE RESISTANCE BETWEEN 6.0 AND 10.0 OHMS? Yes No Go to AH5 . INSTALL a new VDF. Refer to the appropriate ENGINE COOLING article.
AH5 CHECK THE VDF SOLENOID FOR A SHORT TO GROUND Measure the resistance between the VDF solenoid control circuit pin 4, component side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AH6 . INSTALL a new VDF. Refer to the appropriate ENGINE COOLING article.
AH6 CHECK THE VDF SOLENOID VPWR CIRCUIT FOR VOLTAGE Key on, engine off. Measure the voltage between the VDF solenoid VPWR circuit pin 5, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to AH7 . REPAIR the circuit.
AH7 CHECK VDF SOLENOID CONTROL CIRCUIT FOR AN OPEN Key off. Disconnect the PCM. Measure the resistance between the VDF solenoid control circuit pin 4, harness side and the PCM engine connector pin 14, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AH8 . REPAIR the circuit.
AH8 CHECK THE VDF SOLENOID CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the VDF solenoid control circuit pin 4, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AH9 . REPAIR the circuit.
AH9 CHECK THE VDF CONTROL CIRCUIT FOR SHORT TO POWER Key on, engine off. Measure the voltage between VDF solenoid control circuit pin 4, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. INSTALL a new PCM.
AH12 CHECK THE FAN SPEED SENSOR FOR VOLTAGE Key off. Disconnect the VDF. Key on, engine off. Measure the voltage between the fan speed sensor VREF circuit pin 6, harness side and the fan speed sensor SIGRTN circuit pin 2, harness side. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to AH17 . Go to AH13 .
AH13 CHECK THE VREF CIRCUIT FOR VOLTAGE Measure the voltage between the fan speed sensor VREF circuit pin 6, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to AH16 . Go to AH14 .
AH14 CHECK THE VREF CIRCUIT FOR AN OPEN Key off Disconnect the PCM. Measure the resistance between the fan speed sensor VREF circuit pin 6, harness side and the PCM engine connector pin 46, harness side. IS RESISTANCE LESS THAN 5 OHMS? Yes No Go to AH15 . REPAIR the circuit.
AH15 CHECK THE VREF CIRCUIT FOR A SHORT TO GROUND Key off Disconnect the PCM. Measure the resistance between the fan speed sensor VREF circuit pin 6, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
AH16 CHECK THE FAN SPEED SENSOR SIGRTN CIRCUIT FOR AN OPEN Key off. Disconnect the PCM. Measure the resistance between the fan speed sensor SIGRTN circuit pin 2, harness side and the PCM engine connector pin 22, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
AH17 CHECK THE FAN SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN Key off. Disconnect the PCM. Measure the resistance between the fan speed sensor signal circuit pin 1, harness side and the PCM engine connector pin 6, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AH18 . REPAIR the circuit.
AH18 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the fan speed sensor signal circuit pin 1, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AH19 . REPAIR the circuit.
AH19 CHECK THE SIGNAL CIRCUIT FOR A SHORT VOLTAGE Key on, engine off. Measure the voltage between the fan speed sensor signal circuit pin 1, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. Go to AH20 .
AH20 CHECK THE SIGNAL CIRCUIT FOR VOLTAGE Key off. Reconnect the PCM. Key on, engine off. Measure the voltage between the fan speed sensor signal circuit pin 1, harness side and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No INSTALL a new VDF. Refer to the appropriate ENGINE COOLING article. INSTALL a new PCM.

AI1 DIAGNOSTIC TROUBLE CODE P1703 NOTE: DTC P1703 indicates that during the key on engine running (KOER) self-test, the BPP signal did not cycle. Possible causes: brake pedal not applied and released during KOER self-test BPP switch BPP switch signal circuit open BPP switch signal circuit short to voltage Key on, engine off. Access the BPP PID. DOES THE BPP PID INDICATE ON? Yes No Go to AI2 . Go to AI4 .
AI2 CHECK THE BPP SWITCH Key off. Disconnect the BPP switch. Key on, engine off. Access the BPP PID. DOES THE BPP PID INDICATE ON? Yes No Go to AI3 . INSTALL a new BPP switch.
AI3 CHECK THE BPP SWITCH SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM. Key on, engine off. Measure the voltage between the BPP switch signal circuit pin 2, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. INSTALL a new PCM.
AI4 CHECK THE BPP SWITCH OPERATION Monitor the BPA PID while applying and releasing the brake pedal. DOES THE BPA PID STATE CHANGE WHEN THE BRAKE PEDAL IS FULLY APPLIED AND RELEASED? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. Go to AI5 .
AI5 CHECK THE BPP SWITCH FOR VOLTAGE Key off. Disconnect the BPP switch. Measure the voltage between the BPP switch B+ circuit pin 3 (F-SuperDuty/Excursion) or pin 1 (E-Series), harness side and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No Go to AI6 . REPAIR the circuit.
AI6 CHECK THE BPP SWITCH SIGNAL Key on, engine off. Access the BPP PID. Connect a 5A fused jumper between the BPP switch B+ circuit pin 3 (F-SuperDuty/Excursion) or pin 1 (E-Series), harness side and the BPP switch signal circuit pin 2, harness side. DOES THE BPP PID INDICATE ON? Yes No INSTALL a new BPP switch. Go to AI7 .
AI7 CHECK THE BPP SWITCH INPUT CIRCUIT FOR AN OPEN Key off. Disconnect the PCM body harness connector. Measure the resistance between the BPP switch signal circuit pin 2, harness side and the PCM body harness connector pin 18, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.

AK1 PRELIMINARY DIAGNOSIS FOR DTC P0046 NOTE: Refer to the PCM and component connector, see scheme 67 and see scheme 68 at the beginning of this pinpoint test. Perform the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Record freeze frame data. Clear all DTCs. Perform the On-Demand Self Test. IS DTC P0046 PRESENT? Yes No Go to AK2. UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. WIGGLE harness attempting to recreate fault. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
AK2 DIAGNOSTIC TROUBLE CODE (DTC) P0046 Possible causes: control circuit open control circuit shorted to voltage control circuit shorted to ground VGT actuator PCM. Key off. Disconnect the VGT actuator electrical connector. Key on. Measure the voltage between the VGT electrical connector pin 1 and ground. IS THE VOLTAGE GREATER THAN 11.0 VOLTS? Yes No Go to AK3. REPAIR open in circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AK3 CHECK VGT ACTUATOR Key off. Enter output state control. Install a test light between the VGT electrical connector pins 1 and 2, harness side. Key on. Access VGT PIDS. Command VGT to below 10% duty cycle. Command the VGT to 85% duty cycle. DOES THE TEST LIGHT GO OUT AS VGT DUTY CYCLE IS DRIVEN LOW AND LIGHTS AS THE DUTY CYCLE IS DRIVEN HIGH? Yes No Go to AK7. Go to AK4.
AK4 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Remove the test light. Disconnect the PCM engine harness electrical connector. Key on. Measure the voltage between the VGT actuator harness connector pin 2 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to AK5. REPAIR short in control circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AK5 CHECK VGT CONTROL CIRCUIT FOR A SHORT TO GROUND Key off. Measure the resistance between VGT actuator connector pin 2 and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AK6. REPAIR short in control circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AK6 CHECK VGT CONTROL CIRCUIT FOR AN OPEN Measure the resistance between the VGT actuator connector pin 2 and PCM connector pin 10. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No REPLACE the PCM. REPAIR open in control circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AK7 CLEAN THE VGT ACTUATOR VALVE AND RETEST CAUTION: The VGT actuator valve is sensitive to contamination. All work areas must be clean before starting this procedure. Do not allow contamination to enter the valve ports, cam follower, or turbocharger housing. Handle the VGT actuator by the solenoid body only. Do not attempt to wipe oil off the valve. Do not let the valve come in contact with materials that could contaminate the valve mechanism. CAUTION: Use only the Carburetor Tune-Up Cleaner PM-2 to spray the actuator valve. Brake cleaner or other solvents may damage the actuator valve. Remove the VGT actuator from the turbocharger assembly. NOTE: Do not spray the zinc coated larger diameter housing, or electrical connector. Spray the valve with Carburetor Tune-Up Cleaner PM-2 while pressing the cam follower (tip of the actuator). Install the VGT actuator and connect the VGT connector. Key ON, engine running. Access the output state control. Access the VGT PID. Increase the commanded engine speed to 1,250 RPM using output state control. The calibration may limit the actual RPM between 1,150 and 1,200 RPM. Increase the VGT duty cycle to greater than 70%. Decrease the VGT duty cycle to 0%. DOES THE TURBOCHARGER PITCH CHANGE WHEN THE VGT DUTY CYCLE IS INCREASED AND DECREASED? Yes No The system is operating correctly at this time. The concern may have been caused by a contaminated VGT actuator valve. CHANGE the oil and oil filter assembly. INSTALL a new VGT actuator. CLEAR the DTCs. REPEAT the self-test.

AL1 PRELIMINARY DIAGNOSIS FOR DTC P1705 Carry out the visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Carry out the On-Demand Self Test. IS DTC 1705 PRESENT? Yes No refer to the appropriate AUTOMATIC TRANSMISSION article for DTC relating to transmission diagnosis. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE harness attempting to recreate fault.

AM1 DTC P1464: CHECK ACCS PID NOTE: Verify A/C and defrost were off during self-test. If A/C or defrost were on, turn off and rerun self-test. Key on, engine off. A/C and defrost off. Access ACCS PID. IS ACCS PID ON? Yes No Go to AM2 . ACCS input to PCM is requesting A/C. Refer to the appropriate CLIMATE CONTROL SYSTEM article. The ACCS PID indicates that the ACCS input to the PCM is low. VERIFY test results. With A/C and defrost off, RERUN self-test where P1464 was received.
AM2 ACCS PID ON: DISCONNECT A/C CYCLING SWITCH AND CHECK IF ACCS PID TURNS OFF Key off. Disconnect A/C cycling switch. Key on, engine off. Access ACCS PID. IS ACCS PID OFF? Yes No VERIFY operation of A/C demand switch. Refer to appropriate CLIMATE CONTROL SYSTEM article. If OK, REPAIR short to power in A/C demand circuit to A/C cycling switch. Go to AM3 .
AM3 CHECK ACCS CIRCUIT FOR SHORT TO POWER IN HARNESS Key off. Disconnect the PCM. Key on, engine off. Measure the voltage between the PCM harness connector pin 41 and ground. IS VOLTAGE LESS THAN 1.0 VOLTS? Yes No REPLACE PCM. REFER to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538) . REPAIR short circuit.

AN1 VERIFY OPERATION PROCEDURE Verify the vehicle has correct calibration. Refer to the auxiliary powertrain control manual provided with the system to verify correct operating procedures and entry conditions. ARE ENTRY CONDITIONS MET AND CORRECT CALIBRATION INSTALLED? Yes No Go to AN2 . CORRECT operating procedure or CORRECT calibration level as required. CLEAR the DTCs and RETEST. If system still does not operate, Go to AN2 .
AN2 CHECK FOR DTCs NOTE: When performing the Key On Engine Running (KOER) Self Test, wait five seconds after pressing the trigger to start the test before running through the driver-operated controls. The test may take up to five minutes to complete. Verify auxiliary powertrain control system is off before performing any self tests. Perform the Key On Engine Off (KOEO) On-Demand Self Test, KOER Self-Test and Retrieve Continuous DTCs. ARE ANY DTCS RETRIEVED? Yes No REFER to the appropriate pinpoint test. Go to AN3 .
AN3 CHECK THE APCM FOR VOLTAGE Key off. Disconnect the APCM. Key on, engine off. Measure the voltage between the APCM connector pin 3 (F-SuperDuty) or pin 4 (E-Series), harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No Go to AN4 . REPAIR the circuit.
AN4 CHECK THE APCM GROUND CIRCUIT Key off. Measure the resistance between the APCM connector pin 1 (F-SuperDuty) or pin 2 (E-Series), harness side and ground. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AN5 . REPAIR the circuit.
AN5 CHECK CIRCUIT 915 (BUS-) FOR AN OPEN Measure the resistance between the APCM connector pin 4 (F-SuperDuty) or pin 3 (E-Series), harness side and the DLC pin 10, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AN6 . REPAIR the circuit.
AN6 CHECK CIRCUIT 914 (BUS+) FOR AN OPEN Measure the resistance between the APCM connector pin 2 (F-SuperDuty) or pin 1 (E-Series), harness side and the DLC pin 2, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new APCM. REPAIR the circuit.
AN7 CHECK THE BPP SWITCH INPUT Press the brake pedal. IS THE HI-MOUNT STOPLIGHT ON? Yes No Go to AI1 . Refer to the appropriate EXTERIOR LIGHTING article to continue hi-mount stoplight diagnosis.

AO1 PRELIMINARY DIAGNOSIS FOR (DTC) P2284 OR P2288 Perform the KOEO, KOER and Continuous on-demand self tests. Retrieve and record all DTCs. IS DTC P2284 OR P2288 PRESENT? Yes No For KOEO and Continuous DTC P2284 or P2288, Go to AO2 . For KOER DTC P2284 or P2288, Go to AO9 . UNABLE to duplicate condition. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
AO2 DIAGNOSTIC TROUBLE CODE (DTC) P2284 OR P2288 Possible causes: incorrect oil or viscosity poor oil quality gelled fuel/no fuel low fuel pressure biased ICP sensor IPR valve high-pressure oil system leak high-pressure oil pump PCM Verify correct oil quality/viscosity and correct fuel grade are being used for the temperature conditions. IS THE OIL AND FUEL QUALITY OK? Yes No Go to AO3 . REPAIR the fuel or oil condition.
AO3 CHECK FUEL PRESSURE Measure the fuel pressure at the regulator block. Measure the fuel pressure at idle and on the road at WOT at full load. Fuel pressure at idle should be 310 kPa (45 psi) minimum and 207-482 kPa (30-70 psi) at WOT full load. IS THE FUEL PRESSURE WITHIN SPECIFICATIONS? Yes No Go to AO4 . REPAIR the fuel system concern.
AO4 PERFORM THE KOER ON-DEMAND SELF-TEST Perform the KOER On-Demand Self-Test. IS DTC P2284 OR P2288 PRESENT? Yes No Go to AO6 . Go to AO12 .
AO6 ICP SENSOR CHECK Key on, engine off. Access the ICP PID. IS THE ICP PID VOLTAGE BETWEEN 0.18 AND 0.24 VOLTS (EARLY BUILD) OR 0.15 AND 0.35 (LATE BUILD)? Yes No Go to AO7 . INSTALL a new ICP sensor.
AO7 CHECK FOR OIL AERATION Accelerate the engine and hold at 3,300 rpm for three minutes. Access the ICP PID. IS THE INJECTION CONTROL PRESSURE INCREASE GREATER THAN 12.4 MPA (1,800 PSI)? Yes No CHANGE the engine oil. RETEST the system. Go to AO8 .
AO8 CHECK THE IPR DUTY CYCLE UNDER VEHICLE LOAD Access the IPR PID. Operate the vehicle at WOT and a full load condition. DOES THE IPR DUTY CYCLE INCREASE TO 65%? Yes No INSTALL a new IPR valve. Unable to duplicate failure.
AO9 KOER ON-DEMAND DIAGNOSTIC TROUBLE CODE (DTC) P2284, P2288 OR P2290 DTC P2288 indicates that injection control pressure was above commanded desired pressure during self test mode. DTC P2284 or P2290 indicate a difference in commanded and actual injection control pressure. Possible causes: incorrect oil or viscosity poor oil quality gelled fuel/no fuel low fuel pressure biased ICP sensor IPR valve high-pressure oil system leak high-pressure oil pump PCM Verify correct oil quality/viscosity and correct fuel grade are being used for the temperature conditions. IS THE OIL AND FUEL QUALITY OK? Yes No Go to AO10 . REPAIR the fuel or oil condition.
AO10 CHECK FUEL PRESSURE Measure the fuel pressure at the regulator block. Measure the fuel pressure at idle and on the road at WOT at full load. Fuel pressure at idle should be 310 kPa (45 psi) minimum, and 310-551 kPa (45-80 psi) at WOT full load. IS THE FUEL PRESSURE WITHIN SPECIFICATIONS? Yes No Go to AO12 . REPAIR the fuel system concern.
AO12 ICP SENSOR CHECK Key on, engine off. Access the ICP PID. IS THE ICP PID VOLTAGE BETWEEN 0.18 AND 0.24 VOLTS (EARLY BUILD) OR 0.15 AND 0.35 (LATE BUILD)? Yes No Go to AO13 . INSTALL a new ICP sensor.
AO13 OIL AERATION CHECK Accelerate the engine to wide-open throttle and hold for three minutes. IS THE INJECTION CONTROL PRESSURE INCREASE GREATER THAN 12.4 MPA (1,800 PSI)? Yes No CHANGE the engine oil. RETEST the system. Go to AO14 .
AO14 CHECK THE ICP SENSOR VOLTAGE WHILE PERFORMING SELF TEST NOTE: During KOER On-Demand Self Test, ICP will be commanded high 17 MPa (2465 psi), then low 5 MPa (725 psi) and then the EP will be commanded high and low. Install the ICP/EBC Adapter Cable D94T-50-A or equivalent between the ICP sensor and the engine harness. Measure the voltage between the ICP sensor signal circuit, harness side and ground. Perform the KOER On-Demand self-test. DOES THE VOLTAGE READING INCREASE ABOVE 3 VOLTS AND THEN DECREASE TO APPROXIMATELY 1 VOLT DURING THE ICP PORTION OF THE KOER TEST? Yes No If DTC P2284 or P2288 was displayed, INSTALL a new PCM. Go to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . Hard/Start/No Start Diagnostic Procedures. PERFORM the Monitor the ICP While Cranking Test.

AP1 PRELIMINARY DIAGNOSIS FOR CODE (DTC) P2289 Connect the scan tool. Retrieve and record all DTCs. Clear the DTCs. Perform the KOEO and Continuous On-Demand self-tests. IS DTC P2289 PRESENT? Yes No Go to AP2 . UNABLE to duplicate condition. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists.
AP2 DIAGNOSTIC TROUBLE CODE (DTC) P2289 Possible causes: biased ICP sensor open SIGRTN circuit signal circuit shorted to voltage PCM Disconnect the ICP sensor. Disconnect the PCM. Measure the resistance between the ICP sensor SIGRTN circuit pin A, harness side and the PCM engine connector pin 25, harness side. IS RESISTANCE LESS THAN 5 OHMS? Yes No Go to AP3 . REPAIR the circuit.
AP3 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the ICP sensor signal circuit pin C, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. Go to AP4 .
AP4 ICP SENSOR CHECK Key off. Connect the ICP sensor. Connect the PCM. Key on, engine off. Access the ICP PID. IS THE ICP PID VOLTAGE BETWEEN 0.18 AND 0.24 VOLTS (EARLY BUILD) OR 0.15 AND 0.35 (LATE BUILD)? Yes No INSTALL a new PCM. INSTALL a new ICP sensor.

AQ1 DIAGNOSTIC TROUBLE CODE (DTC) P2291 NOTE: This DTC may set after a high-pressure oil system repair (i.e., injector change). Drive the vehicle to clear air from the system after repair and clear the DTC. Continuous DTC P2291 indicates that there was no ICP detected during crank (long crank time). Possible causes: high-pressure oil system repair empty/low oil reservoir at crank low engine oil level or incorrect viscosity IPR circuit fault low-pressure oil pump IPR valve ICP sensor high-pressure oil pump Check the engine oil level. Perform the KOEO On-Demand Self-Test to verify ICP and IPR circuit faults are not present. ARE ANY DTCS PRESENT? Yes No REPAIR the DTCs before continuing. REFER to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000) . For DTC P2291, Go to AQ2 . Go to AQ2 .
AQ2 CHECK THE OIL LEVEL NOTE: If the vehicle stalls after start oil is not being supplied from the low pressure oil system. Verify correct oil level, quality and viscosity. Check base engine oil pressure. refer to the appropriate ENGINE article for specifications. Verify steps 5 and 10 on the Hard Start/No Start Diagnostic Guide have been performed. Clear the DTCs. Monitor the ICP PID while cranking the engine. IS THE ICP PID MINIMUM VOLTAGE 0.85 VOLTS WITHIN 5 SECONDS OF CRANK? Yes No The DTC is intermittent. Go to AQ6 . Go to AQ3 .
AQ3 CHECK THE ICP SENSOR Disconnect the ICP sensor. DOES THE VEHICLE START? Yes No INSTALL a new ICP sensor. Go to AQ4 .
AQ4 HIGH-PRESSURE LEAKAGE TEST Connect the ICP sensor. Clear the ICP sensor DTCs. Perform the Injection Control Pressure Tests. REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) , Hard Start/No Start Procedures. IS A LEAK FAULT INDICATED? Yes No REPAIR as necessary. Go to AQ5 .
AQ5 IPR VALVE CHECK Connect all hoses and the ICP sensor. Install a new IPR valve. DOES THE VEHICLE START? Yes No System OK. INSTALL a new high pressure pump.
AQ6 CHECK FOR INTERMITTENT CIRCUIT FAULTS Key on, engine off. Access the ICP PID. Grasp the vehicle harness near the ICP sensor connector. Wiggle and shake vehicle harness while working toward the PCM. DOES THE ICP PID READING FLUCTUATE? Yes No REPAIR the circuit as necessary. Go to AQ7 .
AQ7 INSPECT THE IPR CIRCUIT Inspect the IPR circuit from the IPR valve through the 12-way connector to the PCM. ARE ANY FAULTS INDICATED? Yes No REPAIR the circuit as necessary. Unable to verify concern at this time.

AR1 PRELIMINARY DIAGNOSIS FOR DTC P0300 Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform Continuous on-demand self test. ARE ANY DTCS PRESENT? Yes No For DTC P0300, REFER to Go to AR2 . For other DTCs, REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) . Misfire is intermittent and is currently not active. If a driveability concern exists, REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) .
AR2 DIAGNOSTIC TROUBLE CODE (DTC) P0300 Possible causes: fuel concern oil aeration high pressure oil pump malfunction fuel injector mechanical engine failure electrical failure Carry out an visual inspection, check for loose connections, damaged or corroded pins. Wiggle harness attempting to recreate the fault. ARE ANY WIRING OR TERMINAL CONCERNS PRESENT? Yes No REPAIR as necessary. PERFORM OBD drive cycle. REFER to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538) . REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) , Performance Diagnostics Chart.

AS1 PRELIMINARY DIAGNOSIS FOR DTC U0105 Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform the on-demand self-test. IS DTC U0105 PRESENT? Yes No Go to AS2 . Unable to duplicate condition. CHECK for loose connection, damaged or corroded pins. WIGGLE harness attempting to recreate the fault.
AS2 DIAGNOSTIC TROUBLE CODE (DTC) U0105 Possible causes: Loose connection CAN circuit FICM power circuit FICM ground circuit FICM relay FICM PCM Key off. Disconnect the FICM relay. Perform the relay component test. REFER to the appropriate COMPONENT TESTING article. IS THE RELAY OK? Yes No Go to AS3 . INSTALL a new FICM relay.
AS3 CHECK THE FICM RELAY VOLTAGE CIRCUITS Key on, engine off. Measure the voltage between the FICM relay pin 2, harness side and ground; and measure the voltage between the FICM relay pin 3, harness side and ground. ARE THE VOLTAGES GREATER THAN 10 VOLTS? Yes No Go to AS4 . REPAIR the circuit in question.
AS4 CHECK THE IGNITION POWER CIRCUIT FOR VOLTAGE Key off. Disconnect the FICM C connector. Key on, engine off. Measure the voltage between the FICM ignition power circuit pin 7, harness side and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No Go to AS5 . REPAIR the circuit.
AS5 CHECK THE LOGIC POWER CIRCUIT FOR AN OPEN Key off. Measure the resistance between the FICM relay pin 5, harness side and the FICM logic power circuit pin 8, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AS6 . REPAIR the circuit.
AS6 CHECK THE RELAY CONTROL CIRCUIT FOR AN OPEN Measure the resistance between the FICM relay pin 1, harness side and the FICM relay control circuit pin 27, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AS7 . REPAIR the circuit.
AS7 CHECK THE FICM GROUND CIRCUITS FOR AN OPEN Measure the resistance between the FICM C connector pins as follows: Pin 1 and ground Pin 2 and ground Pin 3 and ground Pin 22 and ground Pin 26 and ground ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to AS8 . REPAIR the circuit in question.
AS8 CHECK THE FICM CAN CIRCUITS Disconnect the PCM engine harness connector. Perform a visual inspection, check for loose connections or damaged wiring shield between the PCM engine harness connector pins 37, 26 and the FICM harness connector pins 30, 31. ARE THE WIRING AND SHIELD OK? Yes No Go to AS9 . REPAIR as necessary. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AS9 CHECK FICM CAN CIRCUITS FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the PCM engine harness connector pins 37, 26 and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR short to voltage. RESTORE the vehicle. CLEAR DTCs and RETEST the system. Go to AS10 .
AS10 CHECK FICM CAN CIRCUITS FOR A SHORT TOGETHER Key off. Measure the resistance between the PCM engine harness connector pin 37 and pin 26. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AS11 . REPAIR shorted circuits. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AS11 CHECK FICM CAN CIRCUITS FOR A SHORT TO GROUND Key off. Measure the resistance between the PCM engine harness connector pins 37, 26 and ground. ARE THE RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to AS12 . REPAIR short to ground. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AS12 CHECK FICM CAN CIRCUITS FOR AN OPEN Key off. Measure the resistance between the PCM engine harness connector pin 37 and the FICM harness connector C pin 30; and between the PCM engine harness connector pin 26 and the FICM harness connector C pin 31. ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to AS13 . REPAIR open in the faulted CAN circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AS13 CHECK PCM TO FICM COMMUNICATION Key off. Connect the PCM engine harness connector. Connect the FICM harness connector C. Connect the scan tool. Key on, engine off. Access the PCM. Monitor the FICM LPWR, FICM MPWR and FICM VPWR PIDs. Refer to «REFERENCE VALUES - 6.0L DIESEL»(ref-225544) . DO THE PIDS INDICATE CORRECTLY? Yes No INSTALL a new PCM. INSTALL a new FICM.

AT1 PRELIMINARY DIAGNOSIS FOR DTC P2552 Retrieve and record all engine and transmission continuous DTCs. If DTCs P2614 or P2617 are present, follow DTC diagnostic for P2552. IS DTC P2552 PRESENT? Yes No For DTCs P1378 or P1379, Go to «PINPOINT TEST S»(ref-225542-S42830629172006031800000). CLEAR the DTCs. REPEAT the self-test. For all other DTCs, refer to «DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS»(ref-225540-S12604367952006031800000). For DTC P2552, Go to AT2. For DTC P0148, Go to AT5 DIAGNOSTIC TROUBLE CODE (DTC) P0148.
AT2 DIAGNOSTIC TROUBLE CODE (DTC) P2552 NOTE: Refer to the PCM and component connector pin numbers, see scheme 81 and see scheme 82, at the beginning of this pinpoint test. Possible causes: FICMM line open FICMM line shorted to ground Key off. Disconnect the FICM electrical harness connector C. Key on, engine off. Measure the voltage between the FICM connector C pin 9, harness side and ground. IS THE VOLTAGE GREATER THAN 10.5 VOLTS? Yes No CLEAR all engine and transmission DTCs. REPEAT the self-test. If DTC P2552 is present again, INSTALL a new FICM. Go to AT3.
AT3 CHECK FICMM CIRCUIT FOR A SHORT TO GROUND Key off. Disconnect the PCM engine harness connector. Measure the resistance between the PCM engine harness connector pin 28, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AT4. REPAIR the circuit.
AT4 CHECK FICMM CIRCUIT FOR AN OPEN Measure the resistance between the PCM engine harness connector pin 28, harness side and the FICM connector C pin 9, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No CLEAR all engine and transmission DTCs. REPEAT the self-test. If DTC P2552 is present again, INSTALL a new PCM. REPAIR the circuit.
AT5 DIAGNOSTIC TROUBLE CODE (DTC) P0148 Possible causes: Fuel quality CKP or CMP signal noise Retrieve and record all engine and transmission DTCs. IS DTC P0148 PRESENT? Yes No REFER to «PERFORMANCE DIAGNOSTIC PROCEDURES»(ref-225540-S01013480622006031800000). CLEAR the DTCs. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. PERFORM a drive cycle. REFER to «DIAGNOSTIC METHODS - 6.0L DIESEL»(ref-225538). Reflash the PCM. If DTC P0148 is present again, INSTALL a new PCM.

AU1 PRELIMINARY DIAGNOSIS FOR DTC P0069 Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform KOEO on-demand self-test. Perform continuous on-demand self-test. IS DTC P0069 PRESENT ALONG WITH OTHER DTCS? Yes No REFER to the DTC chart for appropriate diagnosis. For DTC P0069 only, Go to AU2 . UNABLE to duplicate concern. ROAD TEST vehicle and RETEST the system.
AU2 DIAGNOSTIC TROUBLE CODE (DTC) P0069 NOTE: Most weather services report a local barometric pressure that has been corrected to factor in sea level. However, the BARO PID reports the barometric pressure for the vehicle's actual altitude. Local weather conditions (high or low pressure) will change the local barometric pressure by several inches of mercury. Possible causes: BARO sensor MAP sensor PCM Access BARO/MAP PIDs. Key on. Record BARO/MAP values. Check that the BARO/PID reading is approximately the same as the barometric pressure reading for the location, day, and altitude where the vehicle is being serviced. DOES THE BARO PID READING COMPARE WITH DAILY BAROMETRIC REPORT FOR SERVICE AREA? Yes No Go to AU3 . INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AU3 COMPARE BARO KOER AND KOEO READINGS Engine running. Access BARO PIDs. Compare engine BARO KOER reading with KOEO reading. IS THE BARO PID VALUE EQUAL TO THE RECORDED VALUE? Yes No Go to AU4 . INSTALL a new BARO sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AU4 COMPARE BARO/MAP VALUES Engine running. Access BARO/MAP PIDs. Compare the BARO/MAP reading with KOEO values. IS THE MAP SENSOR READING WITHIN 30 KPA (4.3 PSI) OF THE BARO READING? Yes No INSTALL a new PCM. RESTORE the vehicle. CLEAR DTCs and RETEST the system. CHECK MAP sensor hose for damage. REPLACE the hose if a concern is found. If no hose concern is detected, INSTALL a new MAP sensor. RESTORE the vehicle. CLEAR DTCs and RETEST the system.

AV1 PRELIMINARY DIAGNOSIS FOR DTC P0645 Perform visual inspection. Connect the scan tool. Retrieve and record all DTCs. Clear all DTCs. Perform on-demand self test. IS DTC P0645 SET? Yes No Go to AV2. Unable to duplicate condition. CHECK for loose connections, damaged or corroded pins. WIGGLE the harness to attempt to recreate the fault. CLEAR all DTCs and return the vehicle to service.
AV2 DIAGNOSTIC TROUBLE CODE (DTC) P0645 Possible causes: A/C control circuit shorted to voltage A/C control circuit open A/C control circuit shorted to ground A/C relay circuit A/C relay PCM Key on, engine off. Access ACCS PID Select A/C control switch "OFF" and then "ON" IS ACCS PID INDICATING "OFF" WHEN SELECTED AND "ON" WHEN SELECTED? Yes No Go to AV3. refer to the appropriate CLIMATE CONTROL SYSTEM article to diagnose the A/C request does not operate.
AV3 CHECK A/C RELAY CIRCUIT NOTE: Refer to the wiring diagram, see scheme 83 and see scheme 84 at the beginning of this pinpoint test. Key off. Remove the A/C relay. Install a test light between auxiliary relay box A/C relay socket VPWR circuit pin 2 and ground. Key on. DOES THE TEST LIGHT ILLUMINATE? Yes No Go to AV4. REPAIR open in circuit. RESTORE the vehicle and RETEST the system. Go to AV4.
AV4 CHECK A/C CONTROL CIRCUIT Install a test light between auxiliary relay box A/C relay socket pin 2 and pin 1. Start engine. Select A/C on and then off. DOES THE TEST LIGHT ILLUMINATE WITH A/C ON AND THEN OFF WHEN A/C IS TURNED OFF? Yes No INSTALL a new A/C relay. RESTORE the vehicle. CLEAR the DTCs and RETEST the system. Go to AV5.
AV5 CHECK A/C CONTROL CIRCUIT FOR A SHORT TO VOLTAGE Engine off, key off. Disconnect the PCM body harness connector. Key on. Measure the voltage between PCM body harness connector pin 2 and ground. IS THE VOLTAGE LESS THAN 0.2 VOLTS? Yes No Go to AV6. REPAIR short to voltage in the relay control circuit. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.
AV6 CHECK A/C RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between PCM body harness connector pin 2, and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No Go to AV7. REPAIR short to ground in relay control circuit. RESTORE the vehicle. CLEAR DTCs and RETEST the system.
AV7 CHECK A/C RELAY CONTROL CIRCUIT FOR AN OPEN Measure the resistance between PCM body harness connector pin 2, and auxiliary relay box A/C relay connector socket pin 1. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new PCM. RESTORE the vehicle and RETEST the system. REPAIR open on circuit. RESTORE the vehicle and RETEST the system.

AW1 PRELIMINARY DIAGNOSIS FOR DTC P2199 Connect the scan tool. Retrieve and record all DTCs. IS DTC P2199 PRESENT? Yes No For DTC P2199 with other DTCs present, REFER to «DIAGNOSTIC SUBROUTINES - 6.0L DIESEL»(ref-225540) , DTC chart for appropriate diagnosis. For DTC P2199 only, Go to AW2 . UNABLE to duplicate concern. ROAD TEST the vehicle and RETEST the system.
AW2 DIAGNOSTIC TROUBLE CODE (DTC) P2199 Possible causes: IAT sensor IAT2 sensor PCM Key off. Soak the engine overnight. Connect the scan tool. Key on, engine off. Access IAT/IAT2 PIDS. ARE BOTH TEMPERATURE READINGS WITHIN 10 DEGREES OF AMBIENT TEMPERATURE? Yes No Go to AW3 . INSTALL a new sensor for the one that is not within range. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.
AW3 CHECK KOER IAT AND IAT 2 VALUES Key on, engine running. Access IAT/IAT2 PIDS. ARE THE SENSOR READINGS WITHIN 40°C (104°F) OF EACH OTHER? Yes No UNABLE to duplicate concern. Soak the vehicle overnight and RETEST the system. If no concern is found, INSTALL a new PCM. RESTORE the vehicle. CLEAR the DTCs and RETEST the system. INSTALL a new IAT sensor. RESTORE the vehicle. CLEAR the DTCs and RETEST the system.

AX1 PRELIMINARY DIAGNOSIS Key on, engine off. Access the PCM. Retrieve and record the DTCs. ARE THERE ANY DTCS PRESENT? Yes No For DTC P0407, Go to AX2 . Go to AX16 . For DTC P0408, Go to AX7 . For DTC P0487, Go to AX11 . For DTC P0488, Go to AX16 . For DTC P1334, Go to AX19 .
AX2 PRELIMINARY DIAGNOSIS FOR DTC P0407 Possible causes: signal circuit open or short to ground VREF circuit open EGRTP sensor PCM Key off. Disconnect the EGRTP sensor. Connect a 5 amp fused jumper wire between the EGRTP sensor VREF circuit pin A, harness side and the EGRTP sensor signal circuit pin C, harness side. Key on, engine off. Access the EGRTP_V PID. IS THE EGRTP_V PID VOLTAGE GREATER THAN 4.5 VOLTS? Yes No INSTALL a new EGRTP sensor. Go to AX3 .
AX3 CHECK THE VREF CIRCUIT FOR VOLTAGE Measure the voltage between the EGRTP sensor VREF circuit pin A, harness side and ground. IS THE VOLTAGE GREATER THAN 4.5 VOLTS? Yes No Go to AX4 . REPAIR the circuit.
AX4 CHECK THE SIGNAL CIRCUIT FOR AN OPEN Key off. Disconnect the PCM engine harness connector. Measure the resistance between the EGRTP sensor signal circuit pin C, harness side and the PCM engine connector pin 38 harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No Go to AX5 . REPAIR the circuit.
AX5 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO GROUND Measure the resistance between the EGRTP sensor signal circuit pin C, harness side and ground. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new PCM. REPAIR the circuit.
AX7 PRELIMINARY DIAGNOSIS FOR DTC P0408 Possible causes: signal circuit short to battery signal return circuit open EGRTP sensor PCM Key off. Disconnect the EGRTP sensor. Key on, engine off. Access the EGRTP_V PID. IS THE EGRTP_V PID VOLTAGE LESS THAN 0.3 VOLTS? Yes No Go to AX8 . Go to AX9 .
AX8 CHECK THE SIGNAL RETURN CIRCUIT FOR AN OPEN Key off. Disconnect the PCM engine harness connector. Measure the resistance between the EGRTP sensor signal return circuit pin B, harness side and the PCM engine connector pin 25, harness side. IS THE RESISTANCE LESS THAN 5 OHMS? Yes No INSTALL a new EGRTP sensor. REPAIR the circuit.
AX9 CHECK THE SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE Key off. Disconnect the PCM engine harness connector. Key on, engine off. Measure the voltage between the EGRTP sensor signal circuit pin C, harness side and ground. IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit. INSTALL a new PCM.
AX11 PRELIMINARY DIAGNOSIS FOR DTC P0487 NOTE: Additional DTCs may set during the utilization of output state control (OSC). Clear all PCM and TCM DTCs after diagnostics have been performed. Repeat the self-test to verify all DTCs have been cleared. Possible causes: EGRTP actuator circuits EGRTP actuator PCM Key off. Disconnect the charge air cooler tube from the throttle body. Key on, engine off. Access Output State Control. Monitor the intake throttle plate. Command the EGRTP actuator open and closed. DOES THE THROTTLE PLATE OPEN AND CLOSE? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. Go to AX12 .
AX12 CHECK THE PCM OUTPUT NOTE: The PCM will activate the EGRTP actuator and perform a full sweep of the throttle plate for each key cycle with the IAT temperature greater than 0°C (32°F). Key off. Disconnect the EGRTP actuator. Measure the voltage between the EGRTP actuator circuit pin A, harness side and the EGRTP actuator circuit pin B, harness side. Monitor the EGRTP actuator and record the maximum and minimum voltage. Key on, engine off. DOES THE VOLTAGE CYCLE FROM 0 TO 12 VOLTS? Yes No INSTALL a new EGRTP actuator. Go to AX13 .
AX13 CHECK THE EGRTP ACTUATOR CIRCUITS FOR AN OPEN Key off. Disconnect the PCM engine harness connector. Measure the resistance between the EGRTP actuator, harness side and the PCM engine connector, harness side as follows: pin A and PCM pin 12 pin B and PCM pin 24 ARE THE RESISTANCES LESS THAN 5 OHMS? Yes No Go to AX14 . REPAIR the circuit in question.
AX14 CHECK THE EGRTP ACTUATOR CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the EGRTP actuator, harness side and ground as follows: pin A pin B ARE THE RESISTANCES GREATER THAN 10,000 OHMS? Yes No Go to AX15 . REPAIR the circuit in question.
AX15 CHECK THE EGRTP ACTUATOR CIRCUITS FOR A SHORT TO VOLTAGE Key on, engine off. Measure the voltage between the EGRTP actuator, harness side and ground as follows: pin A pin B IS ANY VOLTAGE INDICATED? Yes No REPAIR the circuit in question. INSTALL a new PCM.
AX16 PRELIMINARY DIAGNOSIS FOR DTC P0488 Possible causes: throttle plate EGRTP actuator PCM Key off. Disconnect the charge air cooler tube from the throttle body. Visually inspect the throttle plate for binding or sticking. DOES THE THROTTLE PLATE INDICATE ANY ABNORMAL CONDITION? Yes No INSTALL a new intake throttle assembly. Go to AX17 .
AX17 CHECK THE THROTTLE PLATE POSITIONS NOTE: Additional DTCs may set during the utilization of output state control (OSC). Clear all PCM and TCM DTCs after diagnostics have been performed. Repeat the self-test to verify all DTCs have been cleared. Key on, engine off. Access Output State Control. Monitor the EGRTP_V PID and command the EGRTP actuator open and closed. IS THE ACTUATOR VOLTAGE BETWEEN 0.1 AND 0.93 VOLTS AT 0 PERCENT AND DOES THE ACTUATOR VOLTAGE STEADILY INCREASE AND DECREASE PROPORTIONAL TO THE COMMANDED POSITION? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. INSTALL a new intake throttle assembly.
AX19 PRELIMINARY DIAGNOSIS FOR DTC P1334 NOTE: DTC P1334 is set when the EGRTP closed position voltage is less than 3.83 volts or when the EGRTP open position is greater than 0.93 volts at initial key on. Possible causes: throttle plate circuitry EGRTP actuator PCM Key off. Disconnect the charge air cooler tube from the throttle body. Visually inspect the throttle plate for binding or sticking. DOES THE THROTTLE PLATE INDICATE ANY ABNORMAL CONDITION? Yes No INSTALL a new intake throttle assembly. Go to AX20 .
AX20 CHECK THE EGRTP SIGNAL VOLTAGE NOTE: Additional DTCs may set during the utilization of output state control (OSC). Clear all PCM and TCM DTCs after diagnostics have been performed. Repeat the self-test to verify all DTCs have been cleared. Key on, engine off. Access Output State Control. Monitor the EGRTP_V PID. Monitor the intake throttle plate. Command the intake throttle plate open and closed. IS THE INTAKE THROTTLE OPEN POSITION VOLTAGE LESS THAN 0.93 VOLTS? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded terminals or pins. REPAIR as necessary. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. Go to AX21 .
AX21 CHECK THE EGRTP ACTUATOR CIRCUITS FOR A SHORT TOGETHER Key off. Disconnect the EGRTP actuator. Disconnect the PCM engine harness connector. Measure the resistance between the EGRTP actuator pin A, harness side and the EGRTP actuator pin B, harness side. IS THE RESISTANCE GREATER THAN 10,000 OHMS? Yes No INSTALL a new intake throttle assembly. REPAIR the circuit.

AY1 CHECK THE BPA SIGNAL NOTE: Full brake pedal application may be necessary to correctly operate the BPA switch. Key on, engine off. Access the BPA PID. Monitor the BPA PID while applying and releasing the brake pedal. DOES THE BPA PID STATE CHANGE WHEN THE BRAKE PEDAL IS FULLY APPLIED AND RELEASED? Yes No UNABLE to duplicate condition. CHECK for loose connections, damaged or corroded pins. REFER to «SYMPTOM CHARTS - 6.0L DIESEL»(ref-225539) if a driveability concern exists. Go to AY2 .
AY2 CHECK THE BPA SIGNAL VOLTAGE NOTE: Full brake pedal application may be necessary to correctly operate the BPA switch. Key off. Disconnect the PCM. Key on, engine off. Measure the voltage between the PCM body harness connector pin 28, harness side and ground while fully applying and releasing the brake pedal. IS THE VOLTAGE GREATER THAN 10 VOLTS WITH THE PEDAL RELEASED AND IS THE VOLTAGE LESS THAN 1 VOLT WITH THE PEDAL FULLY APPLIED? Yes No INSTALL a new PCM. Go to AY3 .
AY3 CHECK THE BPA SENSOR VOLTAGE Key off. Disconnect the BPA switch. Key on, engine off. Measure the voltage between the BPA switch pin 1 (F-SuperDuty/Excursion) or pin 2 (E-Series), harness side and ground. IS THE VOLTAGE GREATER THAN 10 VOLTS? Yes No Go to AY4 . REPAIR the circuit.
AY4 CHECK THE BPA SWITCH NOTE: Full brake application may be necessary to correctly operate the BPA switch. Key off. Measure the resistance between the BPA switch pin 1, component side and the BPA switch pin 2, component side while fully applying and releasing the brake pedal. IS THE RESISTANCE LESS THAN 5 OHMS WITH THE PEDAL RELEASED AND IS THE RESISTANCE GREATER THAN 10,000 OHMS WITH THE PEDAL FULLY APPLIED? Yes No REPAIR the signal circuit. INSTALL a new BPA switch.

Engine Controls - Pinpoint Tests - 6.0L Diesel: Diagnosis Ford Econoline E250

Inspection

Test Procedure

Scheme 86

Glow Plug Monitor Self-Test

More articles — Engine Controls - Pinpoint Tests - 6.0L Diesel

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