Transmission Control Systems

TROUBLESHOOTING FLOW-CHART (A540H)

Diagnostic Code 44 (Rear Speed Sensor Circuitry):

Diagnostic Code 61 (Vehicle 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):

Diagnostic Code 73 (No.1 Center Differential Control Solenoid Valve Circuitly):

Diagnostic Code 74 (No.2 Center Differential Control Solenoid Valve Circuitly):

HINT:
- If diagnostic code Nos. 44, 61, 62, 63, 73 or 74 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 vehicle and rear speed sensors, no diagnostic code will appear and the fail-safe system will not function. However, when driving in the D range, the transaxle will not up-shift from first gear, regardless of the vehicle speed.