Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition OFF, disconnect the KR25 Secondary Air Injection Pump Relay. Ignition ON.
Verify a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.
- If the test lamp does not illuminate
1. Ignition OFF.
2. Test for less than 2 Ω in the ignition circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
- If the test lamp illuminates
Connect a DMM, set on the diode setting, between the control circuit terminal 85 and ground.
Verify the DMM reading is greater than 2.5 V or displays O.L. when commanding the Secondary Air Injection Pump Relay OFF with a scan tool.
- If 2.5 V or less
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module
2. Test for less than 1 V between the control circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V
3. Ignition OFF.
4. Test for infinite resistance between the control circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, test or replace the K20 Engine Control Module
- If greater than 2.5 V or displays O.L.
Verify the DMM reading is less than 1 V when commanding the Secondary Air Injection Pump Relay ON with a scan tool.
- If 1 V or greater
1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.
2. Test for less than 2 Ω in the control 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.
- If less than 1 V
Test or replace the KR25 Secondary Air Injection Pump Relay.