Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

Ignition OFF, disconnect the harness connector at the B37 Engine Oil Pressure Switch, ignition ON.
Verify the scan tool Engine Oil Pressure Switch parameter is OK.
- If not OK
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for infinite resistance between the signal circuit terminal 1 (or A) and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K20 Engine Control Module.
- Go to next step: If OK
Install a 3 A fused jumper wire between the signal circuit terminal 1 (or A) and ground.
Verify the scan tool Engine Oil Pressure Switch parameter is Low.
- If not Low
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - Go to next step: If less than 1 V
3. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the K20 Engine Control Module.
- Go to next step: If Low
Test or replace the B37 Engine Oil Pressure Switch.