TCM Trouble Codes
- Turn ignition on. DO NOT start engine. Connect a jumper wire between terminals on monitor coupler. See Fig 1. Note number of flashes from OD OFF light on instrument panel. If system operation is normal, OD OFF light will flash trouble code 12. See Fig 2.
- If system is operating normally, and no trouble codes are present, turn ignition off and remove jumper wire. Perform manual shifting test to determine if problem is electrical or mechanical. See MANUAL SHIFTING TEST under TRANSMISSION SHIFT TESTING. Check system by symptom. See SYMPTOM TROUBLE SHOOTING .
- If a trouble code is present, OD OFF light will flash a trouble code. The number of flashes will equal first digit of trouble code. After a one second pause, second digit will be displayed. See Fig 2.
- If more than one trouble code is present, next trouble code will be displayed after a 3 second pause. Smallest number trouble code will be displayed first. Trouble codes will be repeated. Once trouble code is obtained, determine probable cause. See TROUBLE CODE IDENTIFICATION table.
NOTE:
Manufacturer does not provide diagnostic trouble code testing information. Only symptom trouble shooting and component testing procedures are given. For additional component information, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
TROUBLE CODE IDENTIFICATION
| Trouble Code |
Probable Cause |
| 12 |
System Operation Normal |
| 21 |
No. 1 Shift Solenoid Open Circuit |
| 22 |
No. 1 Shift Solenoid Short Circuit |
| 23 |
No. 2 Shift Solenoid Open Circuit |
| 24 |
No. 2 Shift Solenoid Short Circuit |
| 25 |
TCC Solenoid Open Circuit |
| 26 |
TCC Solenoid Short Circuit |
| 31 |
Vehicle Speed Sensor Open Or Short Circuit |
| 32 |
Throttle Position Sensor Short Circuit |
| 33 |
Throttle Position Sensor Open Circuit |
| 34 |
Defective Park/Neutral Position Switch |
| 36 |
No Signal-Both Vehicle Speed Sensors |
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.