Code No. B1201: Trouble of fuel information
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COMMENTS ON TROUBLE SYMPTOM
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If only the fuel gauge does not operate, the fuel pump and gauge unit, combination meter, wiring harness or connector(s) may be defective.
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- Damaged harness wires and connectors
- Malfunction of fuel pump and gauge unit
- Malfunction of combination meter
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STEP 1. Connector check: fuel pump and gauge unit connector C-13.
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Q.
Is fuel pump and gauge unit connector C-13 in good condition?
 Go to Step 2.
 Repair the connector, and then go to Step 8.
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STEP 2. Check the fuel gauge circuit.
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(1)Disconnect fuel pump and gauge unit connector C-13.
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(2)Use special tool MB991219 to connect a test lamp (12 V - 3.4 W) between the wiring harness connector terminals 4 and 5.
(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.
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STEP 3. Resistance measurement at fuel pump and gauge unit connector C-13 to body earth.
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(1)Disconnect fuel pump and gauge unit connector C-13, and measure at the wiring harness side.
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(2)Measure the resistance value between terminal 4 and earth.
OK: Continuity exists (2 Ω or less)
Q.
Is the check result normal?
Go to Step 5.
Go to Step 4.
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STEP 4. Check the wiring harness between fuel pump and gauge unit connector C-13 (terminal 4) and earth.
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- Check the earth wires for open circuit.
Q.
Is the wiring harness between fuel pump and gauge unit connector C-13 (terminal 4) and earth in good condition?
Go to Step 8.
Repair the harness, and then go to Step 8.
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STEP 5. Check the wiring harness between combination meter connector B-19 (terminal 17) and fuel gauge unit connector C-13 (terminal 5).
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- Check the input line for open or short circuit.
Q.
Is the wiring harness between combination meter connector B-19 (terminal17) and fuel gauge unit connector C-13 (terminal 5) in good condition?
Go to Step 7.
Repair the harness, and then go to Step 7.
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STEP 6. M.U.T.-III data list
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Item No.07: Fuel gauge (target value)
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OK: Fuel gauge and M.U.T.-III displayed values agree with each other.
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Q.
Is the check result normal?
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Go to Step 8.
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Go to Step 7.
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STEP 7. Check whether the diagnosis code is reset.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace fuel pump and gauge unit and then go to Step 8.
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The procedure is complete.
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STEP 8. Check whether the diagnosis code is reset.
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Recheck if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch to "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is the diagnosis code set?
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After the combination meter is replaced, then perform the variant coding (Refer to GROUP 00, Precautions Before Service - How to Perform Variant Coding  ).
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The procedure is complete.
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