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Home >> Ford >> 2006 >> Focus ZX5 SE, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1631 (Engine Controls - Pinpoint Test NB: Malfunction Indicator Lamp Through Pinpoint Test Z: Intermittent - (Except Diesel & Hybrid)) >> Pinpoint Test QB: DTCs P0603 or P1633: Keep Alive Power >> Test Procedure

Test Procedure

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  1. QB1 CHECK THE 12-VOLT BATTERY TERMINALS 
    NOTE: If 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.
    • 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.
  2. QB2 INSPECT THE ENGINE COMPARTMENT FOR PROPER WIRE ROUTING 
    • Inspect the electronic engine control (EEC) system wiring for proper 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 wiring and connectors.

    Is a concern present? 

    Yes No
    REPAIR as necessary. GO to  QB3.
  3. QB3 CHECK KEEP ALIVE POWER (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 10.5 V? 

    Yes No
    GO to  QB4. ISOLATE the fault and REPAIR as necessary.
  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
    INSTALL a new PCM. REFER to FLASH ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY (EEPROM) . Unable to duplicate or identify the fault at this time.
    GO to  Z1.
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