Power & Ground Circuits
NOTE:
For circuit identification and wiring diagram, see WIRING DIAGRAMS
. After each repair procedure has been completed, reconnect all components. Perform POWERTRAIN VERIFICATION TEST VER-1
under VERIFICATION TESTS in SELF-DIAGNOSTICS - PT CRUISER article to ensure system is functioning properly.
Possible Causes:
- PCM Fused B+ Circuit
- PCM Fused Ignition Switch Output Circuit
- PCM Ground Circuits
Testing
- Turn ignition off. Disconnect PCM harness connectors. PCM is located on left side of engine compartment, near air filter housing. See Fig 1 . Connect a test light to ground, probe the PCM fused B+ circuit in the pinout box. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open in fused battery voltage circuit.
- Turn ignition on. Connect a test light to ground, probe the PCM fused ignition switch output circuit in the pinout box. If test light illuminates brightly, go to next step. If test light does not illuminate brightly, repair open in fused ignition switch output circuit.
- Turn ignition off. Using a test light connected to battery positive, individually probe the PCM ground circuits. If test light illuminates at each ground circuit, ground circuits are okay. Test is complete. If test light does not illuminate at each ground circuit, repair open in appropriate ground circuit.