This guide addresses troubleshooting steps for Electronic Controlled Transmission (ECT) system problems in RZJ95 vehicles, specifically when the ECT light illuminates without any noticeable shift point changes.
Problem
The ECT light is illuminated on the dashboard of a 2002 RZJ95 model, but the transmission’s shift points do not change as expected when the ECT system is engaged. The fuse for the ECT system is confirmed to be intact, and a visual inspection of electrical connections has revealed no apparent issues.
Diagnostic Steps
- Check for Diagnostic Trouble Codes (DTCs): The vehicle’s Engine Control Unit (ECU) manages both engine and transmission functions, storing DTCs related to both systems. These codes can provide clues to the source of the problem.
- Retrieve OBD1 Codes: On OBD1 systems, bridge terminals TE1 and E1 on the diagnostic connector. Observe the flashing patterns of the “O/D OFF” light and the “Check Engine” light.
- A steady flashing “Check Engine” light and “O/D OFF” indicates “no codes”. This suggests that the issue may not be detectable by the OBD1 system.
Solution
- Further diagnostic steps are required, as the OBD1 system isn’t reporting any error codes.
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