Troubleshooting Flow Chart


♦ If diagnostic code Nos. 42, 61, 62 or 63 are output, the overdrive OFF indicator light will begin to blink immediately to warn the driver. However, an impact or shock may cause the blinking to stop; but the code will still be retained in the ECT ECU memory until canceled out.

♦ There is no warning for diagnostic code No. 64.

♦ In the event of a simultaneous malfunction of both No. 1 and No. 2 speed sensors, no diagnostic code will appear and the fail-safe system will not function. However, when driving in the D range, the transmission will not up shift from first gear, regardless of the vehicle speed.

Diagnostic code 42 (No. 1 speed sensor circuitry)

Check continuity between ECT ECU connector SP, terminal and body ground. (See page AT-29)

Substitute another ECT ECU.

Diagnostic code 61 (No. 2 speed sensor circuitry)
Diagnostic code 62 (No. 1 solenoid valve circuitry)
Diagnostic code 63 (No. 2 solenoid valve circuitry)
Diagnostic code 64 (Lock-up solenoid valve circuitry)
OK if hot

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