Code No.B1201: Fuel information error


caution Whenever the ECU is replaced, ensure that the communication circuit is normal.










TROUBLE JUDGEMENT



PROBABLE CAUSES



  • Damaged harness wires and connectors
  • Malfunction of fuel pump and gauge assembly
  • Malfunction of combination meter

DIAGNOSIS PROCEDURE

STEP 1. Connector check: D-19 fuel pump and gauge unit <2WD, 4WD (main)> connector and D-40 fuel gauge unit <4WD (sub)> connector

Q. Is the check result normal?
Go to Step 2.
Repair the connector, and then go to Step 9.

STEP 2. Fuel pump and gauge unit and fuel gauge unit check
Check the fuel pump and gauge unit and fuel gauge unit. Refer to .

Q. Is the check result normal?
Go to Step 3.
Replace the fuel pump and gauge unit and fuel gauge unit.

STEP 3. Check of fuel pump and gauge unit circuit
(1)Disconnect the D-19 fuel pump and gauge unit connector.
(2)Use the special tool Check harness (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 the ON position.
(4)Check if the test lamp illuminates.
OK: Illuminates

Q. Is the check result normal?
Go to Step 8.
Go to Step 4.

STEP 4. Resistance measurement at the D-19 fuel pump and gauge unit connector
(1)Disconnect the fuel pump and gauge unit connector, the measure at the harness side.
(2)Measure the resistance between the D-19 fuel pump and gauge unit connector terminal No. 1 and the body earth.
OK: Continuity exists (2 Ω or less)

Q. Is the check result normal?
Go to Step 6.
Go to Step 5.

STEP 5. Check the wiring harness between the D-19 fuel pump and gauge unit connector terminal No. 1 and the body earth.
Check the earth wires for open circuit.

Q. Is the check result normal?
Go to Step 9.
Repair the wiring harness, and then go to Step 9.

STEP 6. Connector check: C-01 combination meter connector

Q. Is the check result normal?
Go to Step 7.
Repair the connector, and then go to Step 9.

STEP 7. Check the wiring harness between the C-01 combination meter connector terminal No. 18 and the D-19 fuel pump and gauge unit connector terminal No. 2
Check the output lines for open circuit.
note <2WD> Before the wiring harness check, check the intermediate connectors C-27, D-09 <RHD> and joint connector D-24 <LHD>, and repair them if necessary.
note <4WD> Before the wiring harness check, check the intermediate connectors C-27, D-09 and joint connector D-24 <except RALLIART-RHD>, and repair them if necessary.

Q. Is the check result normal?
Go to Step 8.
Repair the wiring harness, and then go to Step 9.

STEP 8. M.U.T.-III actuator test

  • Item 03: Fuel gauge (target value): 0 →100%
OK: The fuel gauge operates.

Q. Is the check result normal?
Go to Step 9.
Replace the combination meter.

STEP 9. Check whether the diagnosis code is reset.
Check again if the diagnosis code is set to the combination meter.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3)Check if diagnosis code is set.

Q. Is the diagnosis code set?
Replace the combination meter.
The diagnosis is complete.