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Diagnosis & Repair
- Remove ETCS fuse from the engine room No.1 relay block. See Fig 1. Check continuity of fuse and replace as necessary. If fuse is okay, go to next step.
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- Check the voltage between terminal E1 of ECM E3 connector and +BM of ECM E6 connector. See Fig 2. If 9-14 volts are present, check and replace ECM. If 9-14 volts are not present, go to next step.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Remove the ETCS fuse from the engine room No. 1 relay block. See Fig 1. Disconnect the ECM E6 connector. See Fig 3. Check continuity between the wire harness side connectors. Continuity should be present between ETCS fuse terminal 2 of relay block and +BM (V11-2). Continuity should not be present between ETCS fuse terminal No. 2 of relay block or +BM (V11-2) and ECM E3 connector terminal E1.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Disconnect battery positive terminal. Check continuity between wire harness side connectors. Continuity should be present between battery positive terminal and ETCS fuse terminal No. 1 of relay block. Continuity should not be present between battery positive terminal or ETCS fuse terminal No. 1 of relay block and ECM E3 connector terminal E1. If okay, replace ECM. If not okay, repair or replace harness or connector.