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Keep Alive Power (KAPWR)

KEEP ALIVE POWER (KAPWR) REFERENCE CHART

KEEP ALIVE POWER (KAPWR) KEEP ALIVE POWER (KAPWR)
STEP INSPECTION ACTION
1 DIAGNOSTIC TROUBLE CODES (DTCs) P0603, P1633 AND P2610: PRELIMINARY DIAGNOSIS
NOTE:
  • The DTC P2610 will not reset after the DTCs are cleared. If the DTC P2610 is retrieved before the DTCs are cleared, GO to step 6.
  • Carry out a visual inspection.
  • Retrieve and record all DTCs. See PCM QUICK TEST  .
  • Record the freeze frame data.
  • Clear all the DTCs.
  • Carry out the self-test.
  • Are DTCs P0603, P1633 or P2610 present? 
 Yes For DTCs P0603 and P1633, GO to the next step. For DTC P2610, GO to step 6.
No Unable to duplicate the condition. CHECK for a loose connection and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. See PCM QUICK TEST  if a driveability concern exists.
2 DTCS P0603 AND P1633: 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 an 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 corrosion
  • Are the 12 volt battery terminal connections in good condition? 
 Yes GO to the next step.
No REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
3 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 REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
No GO to the next step.
4 CHECK KAPWR TO THE PCM
  • Key OFF.
  • PCM connector disconnected.
  • Measure the voltage between (+) PCM Connector, Harness Side, KAPWR and (-) 12 Volt Vehicle Battery, Negative terminal.
  • While observing the multimeter, grasp the EEC harness and wiggle, shake or bend a small area while working from the battery to the PCM.
  • Is the voltage greater than 10 V? 
 Yes GO to the next step.
No ISOLATE the concern and REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test.
5 CHECK FOR A REOCCURRENCE 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 GO to the next step.
No Unable to duplicate or identify the concern at this time. See TEST 3: INTERMITTENT  .
6 KOER DTC P2610: ELECTRONIC CONTROL MODULE (ECM)/POWERTRAIN CONTROL MODULE (PCM) INTERNAL ENGINE OFF TIMER PERFORMANCE
  • Clear the DTCs.
  • Key ON, engine running.
  • Get vehicle to stabilized coolant temperature.
  • Key in OFF position.
  • Allow the engine to cold soak long enough for the coolant temp to drop at least 16.7°C (30°F), (turning the key on then off without an engine start for the purpose of checking the coolant temperature does not affect the test results).
  • Is DTC P2610 present? 
 Yes GO to the next step.
No Unable to duplicate the condition. CHECK for a loose connection and damaged or corroded terminals. WIGGLE the harness attempting to recreate the concern. REPAIR as necessary. See PCM QUICK TEST  if a driveability concern exists.
7 VERIFY TROUBLESHOOTING OF DTCs COMPLETED
  • Disconnect all the PCM connectors.
  • Check for:
    • corrosion
    • damaged pins
    • pushed-out pins
  • Connect all connectors and make sure they seat correctly.
  • Clear DTCs from PCM memory using IDS or equivalent generic OBD II tester.
  • Carry out the PCM Quick Test. See PCM QUICK TEST  .
  • Is the same DTC present? 
 Yes INSTALL a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 2.5L or POWERTRAIN CONTROL MODULE (PCM) REMOVAL/INSTALLATION - 3.0L .
REPEAT the PCM Quick Test. See PCM QUICK TEST  .
No If any other DTC is present, go to applicable DTC inspection.
If no DTC is present, troubleshooting complete.
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