Inspection Procedure 7: Fuel Gauge does not Work (Other Meters Work).




COMMENTS ON TROUBLE SYMPTOM
If only the fuel gauge does not operate, the fuel gauge unit, the combination meter, wiring harness or connector(s) may be defective.

PROBABLE CAUSES

  • Damaged harness wires and connectors
  • Malfunction of the fuel gauge unit
  • Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. Check the fuel gauge circuit.
(1)Disconnect F-09 fuel gauge unit connector.

(2)Connect a test lamp (12 V - 3.4 W) via special tool test harness (MB991219) between the wiring harness connector terminals 1 and 2.
(3)Turn the ignition switch to the "ON" position.

Q. Does the test lamp illuminate?

Go to Step 7.

Go to Step 2.

STEP 2. Connector check: Combination meter connector C-113 and fuel gauge unit connector F-09.



Q. Is combination meter connector C-113 and fuel gauge unit connector F-09 in good condition?

Go to Step 3.

Repair or replace the damaged component(s).

STEP 3. Check the wiring harness between combination meter connector C-113 (terminal 22) and fuel gauge unit connector F-09 (terminal 1).





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

Q. Is the wiring harness between combination meter connector C-113 (terminal 22) and fuel gauge unit connector F-09 (terminal 1) in good condition?

Go to Step 4.

Repair or replace the damaged component(s). Then go to Step 4.

STEP 4. Retest the system.

Q. Is the fuel gauge normal?
The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00 / How to Cope with Intermittent Malfunction ).
Go to Step 5.

STEP 5. Check the wiring harness between fuel gauge unit connector F-09 (terminal 2) and earth.

Q. Is the wiring harness between fuel gauge unit connector F-09 (terminal 2) and earth in good condition?

Go to Step 6.

Repair or replace the damaged component(s).

STEP 6. Retest the system.

Q. Is the fuel gauge normal?
The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00 / How to Cope with Intermittent Malfunction ).
Carry out the troubleshooting again.

STEP 7. Check the fuel gauge circuit.
(1)Disconnect F-09 fuel gauge unit connector.

(2)Connect a test lamp (12 V - 3.4 W) via special tool test harness (MB991219) between the wiring harness connector terminals 1 and 2.
(3)Turn the ignition switch to the "ON" position.

Q. Does the fuel gauge in the combination meter fluctuate about half of it full scale?

Replace the fuel gauge unit.

Go to Step 8.

STEP 8. Retest the system.

Q. Is the fuel gauge normal?
The procedure is complete. (If no malfunctions are found in all steps, an intermittent malfunction is suspected. Refer to GROUP 00 / How to Cope with Intermittent Malfunction ).
Replace combination meter.