Expand AllThe transmission control computer ASSY detects the gear position from the signals from turbine speed sensor (NT) and output speed sensor (SP2).
When the detected gear position differs from the specified gear position, the transmission control computer ASSY judges this as mechanical trouble of a solenoid or in the automatic transmission and puts out a diagnostic code.
| DTC No. |
|
Inspection part |
| P0730/37 |
|
|
Detail
- Confirm that a diagnostic code other than DTC P0730/37 is put out.
Standard:
Inspection result Step Only output of P0730/37 To step A Output of P0730/37 and other diagnostic codes To step B
When a diagnostic code other than P0730/37 is put out, perform trouble-shooting first for that diagnostic code.
B
To the related diagnostic code chart (refer to page for the outline)A
Proceed to [2]INSPECT TRANSMISSION SOLENOID ASSY (S1) BY ITSELF
- Inspect operation
- Confirm that the valve in the solenoid operates when battery (24 V) plus is connected to the terminal of the transmission solenoid ASSY (S1) and battery (24 V) minus is connected to the body.
Standard:
Operation (operation sound)- Inspect resistance
- Check the resistance between solenoid terminal and body.
Standard:
40-46Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Proceed to [3]INSPECT TRANSMISSION SOLENOID ASSY (S2) BY ITSELF
- Inspect operation
- Confirm that the valve in the solenoid operates when battery (24 V) plus is connected to the terminal of the transmission solenoid ASSY (S2) and battery (24 V) minus is connected to the body.
Standard:
Operation (operation sound)- Inspect resistance
- Check the resistance between solenoid terminal and body.
Standard:
40-46Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Proceed to [4]INSPECT TRANSMISSION SOLENOID ASSY (S3) BY ITSELF
- Inspect operation
- Confirm that the valve in the solenoid operates when battery (24 V) plus is connected to the terminal of the transmission solenoid ASSY (S3) and battery (24 V) minus is connected to the body.
Standard:
Operation (operation sound)- Inspect resistance
- Check the resistance between solenoid terminal and body.
Standard:
40-46Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Proceed to [5]INSPECT TRANSMISSION SOLENOID ASSY (SL1) BY ITSELF
- Inspect operation
- Confirm that the valve in the solenoid operates when battery (12 V) plus is connected to terminal 2 of the transmission solenoid ASSY (SL1) and battery (12 V) minus is connected to terminal 1.
Standard:
Operation (operation sound)- Inspect resistance
- Check the resistance between terminals 1 and 2.
Standard:
5.0-6.0Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Proceed to [6]INSPECT TRANSMISSION SOLENOID ASSY (SL2) BY ITSELF
- Inspect operation
- Confirm that the valve in the solenoid operates when battery (12 V) plus is connected to terminal 2 of the transmission solenoid ASSY (SL2) and battery (12 V) minus is connected to terminal 1.
Standard:
Operation (operation sound)- Inspect resistance
- Check the resistance between terminals 1 and 2.
Standard:
5.0-6.0Ω (20°C, 68°F)
Replace the automatic transmission ASSY.
Inspect and replace the transmission control computer ASSY.
- Confirm the DTC P0730/37 is inactive
- Start the engine and let it idling condition.
- Verify the DTC P0730/37 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P0730/37 is reoccurF Return to first process
- Other DTC appearF Refer to concerned Trouble shooting
Complete
