Expand AllThe transmission control computer ASSY performs shifting from gear 1 to gear 6 according to the combination of solenoids SL1, SL2, SL3, S1, S2, and S3. In case of a short-circuit or a wire break of one of the solenoid valve systems, the transmission control computer ASSY switches the other solenoids ON or OFF as a failsafe function. In case of failure of all solenoid valves, the circuit becomes just a mechanical hydraulic circuit and manual shifting is performed. (In case of a wire break or a short-circuit, the transmission control computer ASSY stops energizing the failed solenoid.)
| DTC No. |
|
Inspection part |
| P0973/62 |
|
|
| P0974/62 |
|
|
| P0976/63 |
|
|
| P0977/63 |
|
|
| P0979/64 |
|
|
| P0980/64 |
|
|
Detail
- Disconnect connector A of the transmission wire.
- Check the resistance between the terminals.
Standard:
Terminal No. (terminal symbol) Resistance value [Ω] A10 (S1) ↔ Body earth 40-46 (20°C, 68°F) A3 (S2) ↔ Body earth 40-46 (20°C, 68°F) A9 (S3) ↔ Body earth 40-46 (20°C, 68°F)
Inspection result
Status Step S1 trouble To step A S2 trouble To step B S3 trouble To step C Normal To OK
(A): To step 3
(B): To step 4
(C): To step 5
Proceed to [2]INSPECT WIRE HARNESS AND CONNECTOR (TRANSMISSION WIRE - TRANSMISSION CONTROL COMPUTER ASSY)
- Connect connector A of the transmission wire and disconnect connector A of the transmission control computer ASSY.
- Check the resistance between the terminals. (Refer to page for the terminal layout.)
Standard:
Terminal No. (terminal symbol) Resistance value [Ω] A1 (S1) ↔ B8 (GND1) 40-46 (20°C, 68°F) A2 (S2) ↔ B8 (GND1) 40-46 (20°C, 68°F) A3 (S3) ↔ B8 (GND1) 40-46 (20°C, 68°F)
Repair or replace wire harness and connector.
Inspect and replace the transmission control computer ASSY.
- Disconnect the connector of the transmission solenoid ASSY (S1).
- Check the resistance between solenoid terminal and body earth.
Standard:
40-46Ω (20°C, 68°sF)
Replace the automatic transmission ASSY.
Repair or replace the transmission wire.
- Disconnect the connector of the transmission solenoid ASSY (S2).
- Check the resistance between solenoid terminal and body earth.
Standard:
40-46Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Repair or replace the transmission wire.
- Disconnect the connector of the transmission solenoid ASSY (S3).
- Check the resistance between solenoid terminal and body earth.
Standard:
40-46Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Repair or replace the transmission wire.
- Confirm the DTC P0974/62 is inactive
- Start the engine and let it idling condition.
- Verify the DTC P0974/62 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P0974/62 is reoccurF Return to first process
- Other DTC appearF Refer to concerned Trouble shooting
Complete
