Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector : K38 Chassis Control Module
- Connect a test lamp between the test points : Control circuit terminal 20 & Ground
- Perform the scan tool control function : Fuel Pump Enable Command @ Engine Control Module - On and Off
Verify the test lamp turns On and Off.
- If the test lamp is always Off
- Ignition/Vehicle - Off & Remove - Test lamp
- Disconnect the electrical connector : K20 Engine Control Module
- Ignition - On / Vehicle - In Service Mode
- Test for less than 1 V between the test points : Control circuit terminal 20 @ K38 Chassis Control Module & Ground
- If 1 V or greater - Repair the short to voltage on the circuit.
- Go to next step : If less than 1 V
- Ignition/Vehicle - Off
- Test for less than 2 ohms between the test points : Control circuit terminal 20 @ K38 Chassis Control Module & The other end of the circuit
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- If less than 2 ohms - Replace the component : K20 Engine Control Module
- If the test lamp is always On
- Ignition/Vehicle - Off & Remove - Test lamp
- Disconnect the electrical connector : K20 Engine Control Module
- Test for infinite resistance between the test points : Control circuit terminal 20 @ K38 Chassis Control Module & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- If infinite resistance - Replace the component : K20 Engine Control Module
- Go to next step : If the test lamp turns On and Off
- Test or replace the component : K38 Chassis Control Module
NOTE:
It may take up to 2 min for all vehicle systems to power down before an accurate ground or low Reference circuit continuity test can be performed.