Circuit/System Testing - Test 1
WARNING: This page is about a different variant/trim than selected.
- Ignition/Vehicle & All vehicle systems - Off
- Disconnect the electrical connector: X1 @ K20 Engine Control Module
- Test for battery voltage between the test points: B+ circuit terminal 1 & Ground
- If less than battery voltage
- Test for less than 2 ohms between the test points:
- {Cadillac}B+ circuit terminal 1 & Output terminal @F5UD Fuse
- {Chevrolet/GMC}B+ circuit terminal 1 & Output terminal @F5BA Fuse
- If 2 ohms or greater - Repair the open/high resistance in the circuit.
- Go to next step: If less than 2 ohms
- Test for infinite resistance between the test points: B+ circuit terminal 1 & Ground
- If less than infinite resistance - Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Verify the fuse is OK and there is voltage at the fuse.
- If a condition exists - Repair or replace as necessary
- If no condition exists - Replace the component: K20 Engine Control Module
- Go to next step: If battery voltage
- Connect a DMM between the test points: B+ circuit terminal 1 & Ground
- Verify the DMM displays the following: Battery Voltage = The value should not spike or drop out.
Perform the action while monitoring the DMM:
- {Cadillac}Wiggle the harness and connector(s): X9 - A@X50B Battery Distribution Engine Compartment Fuse Block
- {Chevrolet/GMC}Wiggle the harness and connector(s): X5 - A@X50B Battery Distribution Engine Compartment Fuse Block
- If the value spikes or drops out
Repair as necessary - Wiring/Terminal(s)/Electrical Connector(s)/Fuse
- Go to next step: If the value does not spike or drop out
- Replace the component: K20 Engine Control Module