1.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM and electronic throttle control.
3) Measure the resistance of harness between ECM and electronic throttle control connector.
Connector & terminal
(B134) No. 18 — (E57) No. 6:
(B134) No. 29 — (E57) No. 3:
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Is the resistance less than 1 Ω?
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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
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2.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.
1) Connect the connector to ECM.
2) Measure the resistance between electronic throttle control connector and engine ground.
Connector & terminal
(E57) No. 3 — Engine ground:
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Is the resistance less than 5 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM and engine ground
• Poor contact in ECM connector
• Poor contact of coupling connector
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3.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to ON.
2) Measure the voltage between electronic throttle control connector and engine ground.
Connector & terminal
(E57) No. 6 (+) — Engine ground (−):
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Is the voltage 4.85 V or more?
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Repair the short circuit to power in the harness between ECM and electronic throttle control connector.
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4.CHECK HARNESS BETWEEN ECM AND ELECTRONIC THROTTLE CONTROL.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from the ECM.
3) Measure the resistance between ECM connectors.
Connector & terminal
(B134) No. 19 — (B134) No. 18:
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Is the resistance 1 MΩ or more?
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Repair poor contact of the electronic throttle control connector. Replace the electronic throttle control if defective. 
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Repair the short circuit to power in the harness between ECM and electronic throttle control connector.
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