Code No.B1201 Trouble of fuel information














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

PROBABLE CAUSES

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

DIAGNOSIS PROCEDURE

STEP 1. Connector check: Fuel tank gauge unit connector E-15.

Q. Is fuel tank gauge unit connector E-15 in good condition?
Go to Step 2.
Repair the connector.

STEP 2. Check the fuel gauge circuit.
(1)Disconnect fuel tank gauge unit connector E-15.

(2)Use special tool MB991219 to connect a test lamp (12 V - 3.4 W) between the wiring harness connector terminals 1 and 2.
(3)Turn the Ignition switch to "ON" position.
(4)Check if the test lamp illuminates.
OK: Illuminates

Q. Is the check result satisfactory?

Go to Step 6.

Go to Step 3.

STEP 3. Connector check: Combination meter connector D-02.

Q. Is combination meter connector D-02 in good condition?
Go to Step 4.
Repair the connector.

STEP 4. Check the wiring harness between combination meter connector D-02 (terminals 40 and 49) and fuel tank gauge unit connector E-15 (terminals 2 and 1).

  • Check the input/output line for open circuit and short circuit.
note Prior to the wiring harness inspection, check intermediate connectors D-221 and E-09, and repair if necessary.

Q. Is the wiring harness between combination meter connector C-02 (terminal 40 and 49) and fuel gauge unit connector D-07 (terminal 2 and 1) in good condition?
Go to Step 5.
Repair the harness.

STEP 5. M.U.T.-III data list

  • Item No.7: Fuel gauge (Target)
OK: Fuel gauge and M.U.T.-III displayed values agree with each other.

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Retest the system.
Check that the fuel gauge works normally.

Q. Is the check result normal?
The procedure is complete.
Replace the fuel tank gauge unit and then go to Step 7.

STEP 7. Retest the system.
Check that the fuel gauge works normally.

Q. Is the check result normal?
The procedure is complete.
Replace the combination meter.