Circuit/System Testing
NOTE:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
- Ignition ON, observe the Ignition 1 Signal and the EC Ignition Relay Feedback scan tool parameter to determine which is more than 3 V lower than the other.
- Ignition OFF, remove the relay that corresponds to the scan tool parameter that is more than 3 V lower.
- Ignition ON, connect a 20 A fused jumper wire between B+ and the applicable ignition voltage circuit terminal. Verify that the applicable scan tool parameter displays between 9-14 V.
- If the applicable scan tool parameter is less than the specified value, test the ignition voltage circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- If all circuits test normal, replace the applicable relay.
NOTE:
The Ignition 1 Signal is supplied by the Run/Crank relay. The EC Ignition Relay Feedback signal is supplied by the powertrain relay.
NOTE:
A resistance of 6 Ω or greater in the circuit/underhood fuse block will cause the DTC to set.