Page 1 of 18 On Board Diagnostics PCED 7/25/2009 http://www ...

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On Board Diagnostics PCED http://www.fordtechservice.dealerconnection.com/pubs/content/~WV52/~MUS~LEN/14/... Page 6 of 18 7/25/2009 Is the voltage between 4.5 - 5.5 V? Yes INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). INSTALL a new FPDM. No KB24 CHECK THE FP CIRCUIT IN THE FPDM FPDM connector connected. FPDM2 connector disconnected (Ford GT). Key ON, engine OFF. Measure the voltage between: ( + ) PCM Connector, Harness Side ( - ) FP Ground Is the voltage greater than 10.5 V? Yes INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). INSTALL a new FPDM. No KB25 CHECK THE FPF PID PCM connector connected. REM connector connected. Key ON, engine OFF. Access the PCM and monitor the FPF PID. While viewing the FPF PID, check if PID indicates YES sometime within 20 seconds. Does the FPF PID indicate YES sometime within 20 seconds? Yes GO to KB28 . GO to KB26 . No KB26 CHECK THE FP PID Access the PCM and monitor the FP PID. Is the duty cycle between 70 - 80%? GO to KB27 . Yes Key in OFF position. INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). No KB27 CHECK THE PWM_DC1 PID Access the REM and monitor the PWM_DC1 PID. Is the duty cycle between 70 - 80%? Key in OFF position. Yes No No fault found. DISREGARD DTC P1235 at this time. INSTALL a new REM. RETURN to Section 3 , Symptom Charts for further direction. KB28 CHECK THE REM CIRCUITRY VOLTAGE ON THE FP CIRCUIT AT THE PCM Key in OFF position. PCM connector disconnected. Key ON, engine OFF. Measure the voltage between: ( + ) PCM Connector, Harness Side ( - ) FP Ground Is the voltage greater than 8 V? Yes INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). INSTALL a new REM. No
On Board Diagnostics PCED http://www.fordtechservice.dealerconnection.com/pubs/content/~WV52/~MUS~LEN/14/... Page 7 of 18 7/25/2009 KB29 CHECK THE FP CIRCUIT(S) FOR INTERMITTENT CONCERNS Key ON, engine OFF. Access the REM and monitor the PWM_DC1 PID. Observe the PWM_DC1 PID for an indication of a fault while completing the following: (the PID value changes when a fault is detected). Shake, wiggle, and bend the FP circuit between the PCM and REM Lightly tap on the FPDM to simulate road shock Is a concern present? Yes Key in OFF position. No ISOLATE the fault and REPAIR as necessary. Unable to duplicate or identify the fault at this time. GO to Z1 . KB30 CHECK THE FP CIRCUIT FOR AN INTERMITTENT OPEN OR SHORTS Key ON, engine OFF. Access the PCM and monitor the FPM PID. Note: With no fault detected, the FPDM sends a 50% duty cycle (all OK) to the PCM on the FPM circuit. Depending on diagnostic tools, the FPM PID may display 50%, or a random value that is fluctuating between 85% and 115%. Observe the FPM PID for an indication of a fault while completing the following: (look for the FPM PID to change from the 50% value, or to stop fluctuating). Shake, wiggle, and bend the FP circuit between FPDM and the PCM Lightly tap on the FPDM to simulate road shock Is a concern present? Yes Key in OFF position. No ISOLATE the fault and REPAIR as necessary. Unable to duplicate or identify the fault at this time. GO to Z1 . KB31 DTC P1237: IS DTC P1237 PRESENT IN THE KOEO SELF-TEST? Note: The Ford GT is equipped with 2 FPDMs. DTC P1237 applies to the FPDM mounted in the upper position on the bracket. Carry out the KOEO self-test. Is DTC P1237 present? Yes DTC P1237 is possibly intermittent. No A hard fault is present. GO to KB32 . For LS, and Thunderbird, GO to KB49 . For all others, GO to KB38 . KB32 DOES THE ENGINE START? Note: The Ford GT starts with 1 FPDM disabled. FPDM2 connector disconnected (Ford GT). Does the engine start? For LS, and Thunderbird, GO to KB52 . For all others, GO to KB41 . Yes For LS, and Thunderbird, GO to KB43 . For all others, GO to KB33 . No KB33 CHECK FPPWR, FPRTN AND INTERNAL FUEL PUMP CIRCUIT RESISTANCE FPDM connector disconnected. Measure the resistance between: ( + ) FPDM Connector, Harness Side ( - ) FPDM Connector, Harness Side FPPWR FPRTN Is the resistance less than 10 ohms? Yes No
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