Inspection Procedure 2: The drive information is not displayed normally.




CIRCUIT OPERATION




  • The vehicle speed signal is calculated from the vehicle speed pulse received from the vehicle speed sensor.
  • The remaining fuel amount is calculated from the data received from the fuel gauge unit.
  • The fuel injection quantity is calculated from the fuel injection quantity data received from the engine-ECU by CAN communication.

COMMENTS ON TROUBLE SYMPTOM



PROBABLE CAUSES



  • Malfunction of the CAN bus line
  • Malfunction of the RV meter
  • Malfunction of the Engine- ECU
  • Malfunction of the fuel gauge unit
  • Malfunction of the vehicle speed sensor
  • Incorrect function type setting
  • Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the function type in the service mode.
Check that the function type is set as 1 or 3 in the service mode. (Refer to .)

Q. Is the check result satisfactory?
Go to Step 2
Set the function type again in the service mode, and recheck the trouble symptom.

STEP 2. M.U.T.-III CAN bus diagnostics
Use the M.U.T-III to diagnose the CAN bus lines.

Q. Is the check result satisfactory?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C, Diagnosis - Can Bus Diagnostics Table ). After diagnosing the CAN bus lines, go to Step 3.

STEP 3. M.U.T-III other system diagnosis code.
Check whether the DIESEL system-related diagnosis code is set.

Q. Is the diagnosis code set?
Diagnose DIESEL system. (Refer to GROUP 13A -, Troubleshooting .) After diagnosing the DIESEL system, go to Step 4.
Go to Step 4

STEP 4. M.U.T.-III diagnosis code.
When the ignition switch is turned to the "LOCK" (OFF) position, check that the RV meter does not set the diagnosis code.

Q. Is the diagnosis code set?
Refer to diagnosis code chart .
Go to Step 5

STEP 5. Check the speedometer.
Check whether the speedometer works normally.(Refer to .)

Q. Does the speedometer work normally?
Go to Step 6
Diagnose the combination meter. (Refer to Combination meter - Troubleshooting .)

STEP 6. Connector check: RV meter connector C-171, joint connector C-127




Q. Is the check result normal?

Go to Step 7

Repair the defective connector.

STEP 7. Check the harness wire between C-171 RV meter connector terminal No.13 and C-127 joint connector terminal No.18.





  • Check the signal line circuit for open circuit and short circuit.

Q. Is the check result normal?

Go to Step 8

Repair the wiring harness.

STEP 8. Connector check: fuel gauge unit connector F-09

Q. Is the check result normal?

Go to Step 9

Repair the defective connector.

STEP 9. Check the fuel gauge unit.
Check the fuel gauge unit .

Q. Is the check result normal?
Go to Step 10
Replace the fuel gauge unit.

STEP 10. Measure the resistance at F-09 fuel gauge unit connector.

(1)Disconnect the connector, and measure at the wiring harness side.

(2)Measure the resistance between F-09 fuel gauge unit connector terminal No.2 and body earth
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?

Go to Step 12

Go to Step 11

STEP 11. Check the harness wire between F-09 fuel gauge unit connector terminal No.2 and body earth.


  • Check the earth wires for open circuit.

Q. Is the check result normal?

Retest the system.

Repair the wiring harness.

STEP 12. Check the wiring harness between C-171 RV meter connector terminal No.9 and F-09 fuel gauge unit connector terminal No.1.




note Prior to the wiring harness inspection, check the intermediate connector C-30, and repair if necessary.

  • Check the input line circuit for open circuit and short circuit.

Q. Is the check result normal?

Go to Step 13

Repair the wiring harness.

STEP 13. Recheck for malfunction.

Q. Is a malfunction eliminated?
If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction .
Replace the RV meter.