Expand AllThe transmission control computer ASSY receives accelerator opening signal, idle signal, and other information from the engine control computer and sends lock-up status, shift range position, and other information to the engine control computer.
| DTC No. |
|
Inspection part |
| P0863/88 |
|
|
Detail
- Connect the SST between terminals B23 (EFI-) and B8 (GND1) and between B24 (EFI+) and B8 (GND1) of the transmission control computer ASSY. (Refer to page for the terminal layout.)
- Inspect the waveform between terminals B23 (EFI-) and B8 (GND1) of the transmission control computer ASSY.
Standard:
ITEM CONTENTS Measuring terminal EFI- ↔ GND1 Instrument setting 1V/DIV, 2ms/DIV Measuring condition Engine at idle speed
- Inspect the waveform between terminals B24 (EFI+) and B8 (GND1) of the transmission control computer ASSY.
Standard:
ITEM CONTENTS Measuring terminal EFI+ ↔ GND1 Instrument setting 1V/DIV, 2ms/DIV Measuring condition Engine at idle speed
Inspect and replace the transmission control computer ASSY.
Proceed to [2]INSPECT WIRE HARNESS AND CONNECTOR (TRANSMISSION CONTROL COMPUTER ASSY - ENGINE CONTROL COMPUTER)
- Inspect conductivity
- Disconnect connector B of the transmission control computer ASSY and connector D of the engine control computer.
- Check the conductivity between the terminals of the connector on the wire harness side of the transmission control computer ASSY and the connector on the wire harness side of the engine control computer. (Refer to page for the terminal layout.)
Standard:
Terminal No. (terminal symbol) (Transmission computer ↔ engine control computer) Conductivity B20 (ECT-) ↔ D24 (ECT-) Yes B21 (ECT+) ↔ D25 (ECT+) Yes B23 (EFI-) ↔ D30 (EFI-) Yes B24 (EFI+) ↔ D31 (EFI+) Yes - Inspect insulation
- Check the insulation between the connector on the wire harness side of the transmission control computer ASSY and body earth. (Refer to page for the terminal layout.)
Standard:
Terminal No. (terminal symbol) Conductivity B20 (ECT-) ↔ Body earth No B21 (ECT+) ↔ Body earth No B23 (EFI-) ↔ Body earth No B24 (EFI+) ↔ Body earth No
Repair or replace wire harness and connector.
Inspect and replace the engine control computer.
- Confirm the DTC P0863/88 is inactive
- Start the engine and let it idling condition.
- Verify the DTC P0863/88 is inactive.
- DTC Clear
- Clear the DTC with Hino DX
- Confirm the same DTC is not reoccurred
- P0863/88 is reoccurF Return to first process
- Other DTC appearF Refer to concerned Trouble shooting
Complete
