TECHNICAL DESCRIPTION (COMMENT)
If only the fuel gauge does not operate, the fuel pump and gauge unit, the combination meter, wiring harness or connector(s) may be defective.TROUBLESHOOTING HINTS
- Malfunction of the fuel gauge unit.
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- Malfunction of the combination meter.
DIAGNOSIS PROCEDURE
)
- Connect a test lamp (12 V - 3.4 W) via test harness (MB991219) between the wiring harness connector terminals 1 and 2.
- Turn the ignition switch to the "ON" position.
Q: Does the test lamp illuminate?
YES:
Go to Step 8
.NO: Go to Step 2
.STEP 3. Check the wiring harness between combination meter connector C-04 (terminal 43) and fuel pump and gauge unit (main) connector D-16 (terminal 2).
NOTE: Prior to the wiring harness inspection, check fuel gauge unit (sub) connector D-12, intermediate connector C-117, D-23 <Vehicles for Brazil and Chile>, D-24 <except for Brazil and Chile>, and repair if necessary.
Q: Is the wiring harness between combination meter connector C-04 (terminal 43) and fuel pump and gauge unit (main) connector D-16 (terminal 2) in good condition?
YES:
Go to Step 4.NO: Repair or replace the damaged component(s). Then go to Step 4
.STEP 4. Retest the system.
Q: Is the fuel gauge normal?
YES:
The procedure is complete. (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 
).NO: Go to Step 5
.STEP 6. Check the wiring harness between fuel pump and gauge unit (main) connector D-16 (terminal 1) and earth.
NOTE: Prior to the wiring harness inspection, check intermediate connectors D-23 <Vehicles for Brazil and Chile>, D-24 <except for Brazil or Chile>, and repair if necessary.
Q: Is the wiring harness between fuel pump and gauge unit (main) connector D-16 (terminal 1) and earth in good condition?
YES:
Go to Step 7.NO: Repair or replace the damaged component(s).
STEP 7. Retest the system.
Q: Is the fuel gauge normal?
YES:
The procedure is complete. (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 ).NO: Carry out the troubleshooting again.
- Connect a test lamp (12 V - 3.4 W) via special tool test harness (MB991219) between the wiring harness connector terminals 1 and 2.
- Turn the ignition switch to the "ON" position.
Q: Does the fuel gauge in the combination meter fluctuate about half of it full scale?
YES:
Replace the fuel gauge unit.NO: Go to Step 9
.STEP 9. Retest the system.
Q: Is the fuel gauge normal?
YES:
The procedure is complete. (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 ).NO: Replace combination meter.