This DTC indicates that an internal failure has occurred in PCM. Perform this test only when directed by QUICK TEST. Repeat QUICK TEST . If DTC P0605 is present, replace PCM. Clear DTCs and repeat QUICK TEST. If DTC P0605 is not present, no problem is indicated at this time.
Diagnostic Aids
Perform this test when directed by QUICK TEST. This CIRCUIT TEST is intended to diagnose
- Wiring harness circuit (KAPWR).
- Powertrain Control Module (PCM).
Note. Installing a breakout box or disconnecting battery terminals will interrupt Keep Alive Power (KAPWR) to PCM. DTC P0603 may be stored in continuous memory.
Identifying KAPWR Circuit. Scheme 313
- 1) DTC P0603: Check KAPWR To PCM Turn ignition off. Disconnect PCM 104-pin connector, and inspect for damaged pins, corrosion and loose wires. Repair as necessary. Install Breakout Box (014-00950), leaving PCM disconnected. Connect a DVOM between test pins No. 55 and 76 at breakout box. While observing DVOM, wiggle and bend small sections of wiring harness starting at PCM and working toward instrument panel. If DVOM reading indicates less than 10.5 volts at anytime, isolate fault and repair as necessary. Clear DTCs and repeat «QUICK TEST»(ref-24260-S02984646372001010400000) . If reading does not indicate less than 10.5 volts at anytime, go to next step.
- 2) Confirm DTC P0603 Clear DTCs. Wait 10 minutes to allow DTC to reset. Repeat «KOEO ON-DEMAND SELF-TEST»(ref-24260-S24365487942001010400000) . If DTC P0603 is still present, replace PCM. Clear DTCs and repeat «QUICK TEST»(ref-24260-S02984646372001010400000) . If DTC P0603 is not present, no problem is indicated at this time.