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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 1793 (Engine Controls - Pinpoint Test KP: Charge Air Cooler (CAC) Pump Through Pinpoint Test Z: Intermittent - (Except Diesel & Hybrid)) >> PINPOINT TEST QB: DTCs P0603 or P1633: Keep Alive Power (KAPWR) >> Test Procedure

Test Procedure

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  1. QB1 CHECK THE 12-VOLT BATTERY TERMINALS 
    NOTE: If the KAPWR is interrupted to the PCM when a breakout box is installed or the battery is disconnected, DTC P0603/P1633 can be generated on the first power-up.
    NOTE: If DTC P0603 occurred right after or during an unsuccessful reprogramming of the PCM, clear the DTCs and repeat the PCM self-test. If DTC P0603 is retrieved again, continue with this pinpoint test.
    • Inspect the 12-volt battery cables for loose connections and for corrosion.
    • Are the 12-volt battery terminal connections in good condition? 
    Yes No
    GO to  QB2. REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.
  2. QB2 INSPECT THE ENGINE COMPARTMENT FOR CORRECT WIRE ROUTING 
    • Inspect the electronic engine control (EEC) system wiring for correct wire routing.
    • Check the wiring routing to establish if any of the electrical connectors are being stressed due to poorly routed wiring. If necessary re-route and secure the wiring.
    • Visually inspect the wiring and connectors.
    • Is a concern present? 
    Yes No
    REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.    		 GO to  QB3.
  3. QB3 CHECK KAPWR TO THE PCM 
    • Key in OFF position.
    • PCM connector disconnected.
    • Measure the voltage between:
      ( + ) PCM Connector, Harness Side ( - ) 12 Volt Vehicle Battery
      KAPWR Negative terminal
    • While observing the multimeter, grasp the EEC harness and wiggle, shake or bend a small section while working from the battery to the PCM.
    • Is the voltage greater than 10 V? 
    Yes No
    GO to  QB4. ISOLATE the concern and REPAIR as necessary.
    CLEAR the DTCs. REPEAT the self-test.
  4. QB4 CHECK FOR A REPEAT OF THE DTC 
    • PCM connector connected.
    • Clear all DTCs that may have been caused by the PCM disconnect.
    • Test drive the vehicle and allow the engine to reach normal operating temperature.
    • Carry out the PCM self-test.
    • Is DTC P0603 or P1633 present? 
    Yes No
    GO to  QB5. Unable to duplicate or identify the concern at this time.
    refer to PINPOINT TEST Z .
  5. QB5 CHECK FOR CORRECT PCM OPERATION 
    • Disconnect all the PCM connectors.
    • Visually inspect for:
      • pushed out pins
      • corrosion
    • Connect all the PCM connectors and make sure they seat correctly.
    • Carry out the PCM self-test and verify the concern is still present.
    • Is the concern still present? 
    Yes No
    INSTALL a new PCM. REFER toFLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) , Programming the VID Block for a Replacement PCM. The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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