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Home >> Ford >> 2002 >> Taurus SES, 3.0 S >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Engine Controls - Self-Diagnostics - 6.0L (99P F450/550) Diesel) >> System Tests >> Test Z: Continuous Memory Failure >> Testing

Test Z: Continuous Memory Failure: Testing

WARNING: This page is about a different car, the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: The Powertrain Control Module (PCM) harness connectors must be properly seated and the connector latch properly attached to eliminate possible driveability concerns or a no-start condition. Installing PCM connectors on an angle may cause a bad connection, misdiagnosis and damaged components. Install the connector on where the lever pivots and seats itself. Apply light pressure to get the connector into position on the PCM lever to fully seat the connector.
NOTE: When the PCM engine harness connector is disconnected additional DTCs will be set. All DTCs must be cleared before returning the vehicle to service.

  1. 1) Continuous DTC P0603 Is Set When The PCM Has Lost KAPWR

    Possible causes are:
    • Battery Or PCM Has Been Disconnected
    • Battery Cables Loose Or Poor Connection
    • Battery Discharged
    • Keep Alive Power (KAPWR) Circuit Open
    • Blown KAPWR Fuse
    • Faulty PCM

    Check for other codes. Key on, engine off. Clear DTCs. Cycle key off, then on. Retrieve Continuous DTCs. Is DTC P0603 present? If yes, go to next step. If no, unable to duplicate condition. Check for loose connections, damaged or corroded pins. Wiggle harness attempting to recreate fault. See TROUBLE SHOOTING - NO CODES - 6.0L DIESEL article for driveability concerns.

  2. 2) Check Fuse

    Key off. Measure voltage between KAPWR fuse No. 30 (30-amp) and battery ground. Is battery voltage present on both sides of the fuse? If yes, go to next step. If no, repair short to ground. Restore the vehicle. Clear DTCs and retest the system.

  3. 3) Check Voltage To PCM

    Disconnect the PCM body harness electrical connector C1381A. Measure the voltage between PCM body harness connector C1381A terminals No. 46, 34 and ground. See CONTROL MODULE CONNECTOR IDENTIFICATION . Is battery voltage present? If yes, check for loose connections. Check pins for damage or corrosion. Wiggle the wiring harness while taking measurements. Restore the vehicle. Clear DTCs and retest the system. If no, repair open in the circuit. Restore the vehicle. Clear DTCs and retest the system.
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