*CHECKING THE ECM POWER AND GROUND CIRCUITS
For a complete wiring diagram Refer to Section 8W
| Possible Causes |
| (K342) ASD RELAY CONTROL CIRCUIT OPEN |
| (K347) ASD RELAY OUTPUT CIRCUIT(S) OPEN |
| (Z131) ECM GROUND CIRCUIT(S) OPEN |
| FUSED ASD RELAY BATTERY SUPPLY CIRCUIT OPEN |
| (F26) FUSED IGNITION SWITCH (START) OUTPUT CIRCUIT OPEN |
| (F1) FUSED IGNITION SWITCH (START/RUN) OUTPUT CIRCUIT OPEN |
| SUBSTITUTE ASD RELAY |
| (K342) ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE |
Diagnostic Test
1.ECM GROUND CIRCUIT(S) OPEN
Did the test light illuminate for each cavity?
Yes
- Go To2
No
- Repair the ECM Ground circuit(s) for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
2.FUSED IGNITION SWITCH START OUTPUT CIRCUIT OPEN
Is the test light on?
Yes
- Go To3
No
- Repair the Fused Ignition Switch (Start) Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
3.FUSED IGNITION SWITCH START/RUN OUTPUT CIRCUIT OPEN
Is the test light on for both ignition switch positions?
Yes
- Go To4
No
- Repair the Fused Ignition Switch (Start/Run) Output circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
4.CHECKING THE ASD RELAY SYSTEM
Does the test light illuminate brightly for each circuit?
Yes
- Test Complete.
No
- Go To5
5.FUSED ASD RELAY BATTERY SUPPLY CIRCUIT OPEN
Is the test light on?
Yes
- Go To6
No
- Repair the Fused ASD Relay Battery Supply circuit(s) for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
6.ASD RELAY OUTPUT CIRCUIT OPEN
Did the test light illuminate for each circuit?
Yes
- Go To7
No
- Repair the ASD Relay Output circuit(s) for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
7.ASD RELAY
Did the test light illuminate brightly for each circuit?
Yes
- Replace the ASD Relay.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Go To8
8.ASD RELAY CONTROL CIRCUIT OPEN
Is the resistance below 10.0 ohms?
Yes
- Go To9
No
- Repair the ASD Relay Control circuit for an open.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
9.ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE
Is the voltage above 1.0 volt?
Yes
- Repair the ASD Relay Control circuit for a short to voltage.
- Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
No
- Test Complete.