Circuit/System Testing

Ignition OFF, disconnect the harness connector at the DIC.
Ignition OFF, test for less than 1 ohm between the DIC ground circuit terminal 4 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that all of the scan tool DIC Switch parameters are Inactive or Off.
- If any are not the specified value, test the signal circuit listed below for a short to ground. If the circuits test normal, replace the IPC.
  - DIC Fuel Switch Signal Terminal 9
  - DIC Select Switch Signal Terminal 8
  - DIC Set/Reset Switch Signal Terminal 7
  - DIC Odometer Switch Signal Terminal 5
  - DIC Gage Switch Signal Terminal 6
  - DIC Switch Signal Terminal 9 (Base DIC)
Ignition ON, install a 3-amp fused jumper wire between the signal circuits listed below and the ground circuit terminal 4. Verify all of the scan tool DIC switch parameters are Active or On.
- DIC Fuel Switch Signal Terminal 9
- DIC Select Switch Signal Terminal 8
- DIC Set/Reset Switch Signal Terminal 7
- DIC Odometer Switch Signal Terminal 5
- DIC Gage Switch Signal Terminal 6
- DIC Switch Signal Terminal 9 (Base DIC)
- If any are not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the IPC.
If all circuits test normal, test or replace the DIC switch.