Ignition Relay Circuit
- Perform On-Board Diagnostic (OBD) System Check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in TESTS W/CODES article. After performing OBD system check, go to next step.
- Turn ignition off. Remove IGN relay from underhood electrical center. Using test light connected to ground, probe IGN relay connector battery positive feed circuit. See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
- Turn ignition on with engine off. Using test light connected to ground, probe IGN relay connector ignition feed circuit. See WIRING DIAGRAMS article. If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
- Turn ignition off. Using DVOM connected to ground, check resistance of IGN relay connector ground circuit. See WIRING DIAGRAMS article. If resistance is less than 5 ohms, go to next step. If resistance is greater than 5 ohms, go to step 10).
- Turn ignition off. Connect a fused jumper wire between IGN relay battery positive feed circuit and IGN relay load circuit. See WIRING DIAGRAMS
article. Using test light connected to ground, probe terminals of the following fuses located in underhood electrical center No. 2.
- A/C ("Y" Body)
- A/C CRUISE ("F" Body)
- AIR PUMP ("Y" Body)
- ENG CTRL ("F" Body)
- ENG IGN1 ("Y" Body)
- ENG SEN ("F" Body)
- INJR1
- INJR2
- THROT CONT ("Y" Body)
If test light illuminates on all fuses, go to next step. If test light does not illuminate, go to step 11 .
- Check for poor terminal connection at IGN relay connector. Repair or replace as necessary. If terminal connection is okay, go to next step.
- Replace IGN relay.
- Repair open in IGN relay battery voltage feed circuit.
- Repair IGN relay ignition feed circuit.
- Repair open in IGN relay ground circuit.
- Repair IGN relay load circuit.