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 4 of 18 7/25/2009 Key ON, engine OFF. Measure the voltage between: ( + ) FPDM Connector, Harness Side ( - ) FPM Ground Is the voltage less than 1 V? Key in OFF position. GO to KB16 . Yes REPAIR the short circuit. No KB16 CHECK THE FPM CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS Measure the resistance between: ( + ) FPDM Connector, Harness Side ( - ) FPM Ground Is the resistance greater than 10K ohms? GO to KB17 . Yes REPAIR the short circuit. No KB17 CHECK FOR FPM OUTPUT FROM THE FPDM FPDM connector connected. Key ON, engine OFF. Note: It is OK for the voltage to cycle below this range and then return within range. Measure the voltage between: ( + ) PCM Connector, Harness Side ( - ) FPM Ground Is the voltage between 0.02 - 1 V? Yes INSTALL a new PCM. REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM). INSTALL a new FPDM. No KB18 CHECK CIRCUITS THAT MAY CAUSE AN INTERMITTENT LOSS OF VOLTAGE SUPPLY TO THE FPDM Note: Be aware that P1233 could be set if the inertia fuel shutoff IFS switch is tripped then reset. 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 percent value, or to stop fluctuating). Shake, wiggle, and bend the following circuits: FPDM GND FPDM PWR circuit to the FPDM FPM circuit between the FPDM and the PCM B+ and ground circuits to the FPDM power supply relay Lightly tap on the IFS to simulate road shock Lightly tap on the FPDM to simulate road shock Lightly tap on the FPDM power supply relay to simulate road shock Key in OFF position. Is a concern present? Yes ISOLATE the fault and REPAIR as necessary. No Unable to duplicate or identify the fault at this time. GO to Z1 . KB19 DTC P1235: IS DTC P1235 PRESENT IN THE KOEO SELF-TEST? Note: The Ford GT is equipped with 2 FPDMs. DTC P1235 applies to the FPDM mounted in the upper position on the bracket. Note: For ETC applications, check if ETC DTC P2105 is present. An ETC system concern could cause P1235, and should be diagnosed first. Carry out the KOEO self-test.
On Board Diagnostics PCED http://www.fordtechservice.dealerconnection.com/pubs/content/~WV52/~MUS~LEN/14/... Page 5 of 18 7/25/2009 Is DTC P1235 present? Yes For LS, and No GO to KB20 . Thunderbird, GO to KB29 . For all others, GO to KB30 . KB20 CHECK THE FP CIRCUIT FOR AN OPEN IN THE HARNESS Note: For the LS and Thunderbird the FPDM functions are incorporated into the rear electronics module (REM). In the following steps, if directed to carry out an action with the FPDM, carry out the action with the REM. FPDM connector disconnected. PCM connector disconnected. Measure the resistance between: ( + ) PCM Connector, Harness Side ( - ) FPDM Connector, Harness Side FP FP Is the resistance less than 5 ohms? GO to KB21 . Yes REPAIR the open circuit. No KB21 CHECK THE FP CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS FPDM2 connector disconnected (Ford GT). Key ON, engine OFF. Measure the voltage between: ( + ) FPDM Connector, Harness Side ( - ) FP Ground Is the voltage less than 1 V? Key in OFF position. GO to KB22 . Yes REPAIR the short circuit. No KB22 CHECK THE FP CIRCUIT FOR A SHORT TO GROUND Measure the resistance between: ( + ) FPDM Connector, Harness Side ( - ) FP Ground Is the resistance greater than 10K ohms? For Aviator, Crown Victoria, Focus, Grand Marquis, Yes No Sable, Taurus, and REPAIR the short circuit. Town Car, GO to KB23 . For LS, and Thunderbird, GO to KB25 . For all others, GO to KB24 . KB23 CHECK THE FP CIRCUIT IN THE FPDM FPDM connector connected. Key ON, engine OFF. Measure the voltage between: ( + ) PCM Connector, Harness Side ( - ) FP Ground
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