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    P1689 No Communication Between ECM And VP44

       (1 review)

    Mopar1973Man

    DTC P1689: NO COMMUNICATION BETWEEN ECM & INJECTION PUMP MODULE (OBDII)

    Monitor & Set Conditions

    Communication between Engine Control Module (ECM) and fuel injection pump module is monitored when ignition is on. Injection pump module is referred to as Fuel Pump Control Module (FPCM) in test procedures. DTC may be stored if the time between CAN messages is more than 3 seconds or FPCM does not receive CAN message.

    Possible Causes

    • Wiring & Connectors
    • Fuel Injection Pump Relay Output Circuit Open
    • Ground Circuit Open Or High Resistance
    • Datalink (+) Circuit Open
    • Datalink (+) Circuit Shorted To Ground
    • Datalink (-) Open
    • Datalink (-) Shorted To Ground
    • ECM

    Testing

    1. Turn ignition on with engine off. Using DRBIII(R) scan tool, check for DTCs. If Good Trip Counter for DTC P1689 is displayed and not equal to zero, go to next step. If Good Trip Counter for DTC P1689 is displayed and equal to zero, go to step 3 .

    2. Turn ignition off. At this time, conditions required for DTC to be stored are not present. Inspect wiring and connectors between FPCM and ECM. FPCM located on top of fuel injection pump. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary.

    3. Ensure ignition is off. Disconnect FPCM harness connector. FPCM harness connector is located on end of fuel injection pump. Check for poor connection/terminal contact at FPCM harness connector. Repair as necessary. Turn ignition on with engine off. Using DVOM, measure voltage between ground and terminal No. 7 (Red/Light Green wire) on FPCM harness connector. If voltage is 8 volts or greater, go to next step. If voltage is less than 8 volts, perform DTC P0215: FUEL INJECTION PUMP CONTROL CIRCUIT test.

    4. Turn ignition off. Ensure FPCM connector is still disconnected. Disconnect ECM harness connector. Check for poor connection/terminal contact at ECM harness connector. Repair as necessary. Connect a test light between battery voltage and terminal No. 6 (Black/Tan wire) on FPCM connector. This is the ground circuit for FPCM. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open or high resistance on Black/Tan wire between FPCM and ground connection. Ground connection is located at ground connection for negative battery terminal.

    5. Ensure ignition is off and FPCM harness connector and ECM harness connector are still disconnected. Using DVOM, measure resistance of White wire between terminal No. 2 on FPCM harness connector and terminal No. 13 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open or high resistance in White wire between FPCM and ECM.

    6. Ensure ignition is off and FPCM harness connector and ECM harness connector are still disconnected. Using DVOM, measure resistance between ground and terminal No. 2 (White wire) on FPCM connector. If resistance is 5 ohms or greater, go to next step. If resistance is less than 5 ohms, repair short to ground in White wire between FPCM and ECM.

    7. Ensure ignition is off and FPCM harness connector and ECM harness connector are still disconnected. Using DVOM, measure resistance of Black wire between terminal No. 1 on FPCM harness connector and terminal No. 23 on ECM harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open or high resistance in Black wire between FPCM and ECM.

    8. Ensure ignition is off and FPCM harness connector and ECM harness connector are still disconnected. Using DVOM, measure resistance between ground and terminal No. 1 (Black wire) on FPCM harness connector. If resistance is 5 ohms or greater, replace and program ECM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. If resistance is less than 5 ohms, repair short to ground in Black wire between FPCM and ECM.

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    Cjugg

       0 of 1 member found this review helpful 0 / 1 member

    So I'm doing this test now, but has anyone ever seen where the odometer doesnt pop up at all? Like his whe you first turn ign. all the light scome on dash? Mine don't..just wts, blinkers, high beams, all good, but at one point my mileage rest to 0?? I have 512xxx miles on this guy...radio doesnt work. And cant get truck to crank...real low turnover, gmwas getting p1693/1689/1687 and ome more I cant recall..did the WT ground mod and now its p1693 only...checking IP now at wiring harness

     

    01 5spd Quad cab, 4in turbo back, KnN, ARP STUDS, Smarty Touch(at stock since issues occured, also only way for me to read codes, but my buddy has a handheld that also brought up the 1689 code, twice...on his its says manufacturer control..

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