Checking Relay And Start Relay Control Signal
- It is possible to deduce whether the fault is in the wiring or in the relay by connecting a electrician's screwdriver over the relay socket coil.
- For vehicles with automatic transmission:
The gear selector shall be in position P or N.
- For vehicles with manual transmission:
The gear lever shall be in neutral position.
- Parking brake applied.
Connect a test probe between relay connection #1 (86) and #2 (85) on the relay socket.
Turn the ignition to start position (ignition position III) and observe the light.
If test probe lights up, replace the relay.
If test probe does not light up:
- Check fuses.
- Check the cable between the ignition's 50-feed #B2 and Central Electronic Module (CEM) #A42 for short-circuiting to ground and open circuit.
Check the cable between Central Electronic Module (CEM) #E9 and the relay socket #1(86) for short-circuit to ground and open circuit.
- Check the cable between relay socket #2(85) and Engine Control Module (ECM) for short-circuit to voltage and open circuit.
- Check the connector for the ignition for contact resistance as well as damage to pins and connections.
Check the connector for the Central Electronic Module (CEM) with regards to contact resistance as well as damage to pins and connections.
Check the connector for Engine Control Module (ECM) for contact resistance as well as damage to pins and connections.
Remedy as necessary.
Other information
- See Connecting breakout box for Central Electronic Module (CEM).
- See Connecting breakout box for Engine Control Module (ECM).
- See Signal specification for Central Electronic Module (CEM).
- See Signal specification for Engine Control Module (ECM).
- For connecting test probe, use loose flat pins.
- see CONTENTS
Was a fault detected?
- YES
Refer to VERIFICATION
- NO
Refer to OTHER FAULT-TRACING