1 CHECK INPUT VOLTAGE OF ECM.
- Turn the ignition switch to ON.
- Measure the voltage between ECM and chassis ground.
Connector & terminal
(B136) No. 1 (+) - Chassis ground (-):
(B137) No. 7 (+) - Chassis ground (-):
|
Is the voltage 10 - 13 V? |
Go to step 2. |
Repair the open or ground short circuit of power supply circuit. |
2 CHECK INPUT VOLTAGE OF ECM.
- Start the engine.
- Measure the voltage between ECM and chassis ground.
Connector & terminal
(B136) No. 1 (+) - Chassis ground (-):
(B137) No. 7 (+) - Chassis ground (-):
|
Is the voltage 13 - 15 V? |
Go to step 3. |
Repair the open or ground short circuit of power supply circuit. |
3 CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL CONNECTOR.
- Turn the ignition switch to OFF.
- Disconnect the connectors from ECM and electronic throttle control.
- Measure the resistance of harness between ECM and electronic throttle control connector.
Connector & terminal
(B134) No. 19 - (E57) No. 5:
(B134) No. 29 - (E57) No. 3:
|
Is the resistance less than 1 Ω? |
Go to step 4. |
Repair the harness and connector.
NOTE:
In this case, repair the following item:
- Open circuit in harness between ECM and electronic throttle control connector
- Poor contact of coupling connector
|
4 CHECK ECM GROUND HARNESS.
- Connect all connectors.
- Turn the ignition switch to ON.
- Measure the voltage between ECM and chassis ground.
Connector & terminal
(B134) No. 3 (+) - Chassis ground (-):
(B134) No. 4 (+) - Chassis ground (-):
(B134) No. 6 (+) - Chassis ground (-):
(B137) No. 1 (+) - Chassis ground (-):
(B137) No. 3 (+) - Chassis ground (-):
|
Is the voltage less than 1 V? |
Repair the poor contact of ECM connector. |
Repair the following item.
- Open circuit in ground circuit
- Further tightening of the engine ground terminal
- Poor contact of coupling connector
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