Code No.B1201: Fuel information error
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Whenever the ECU is replaced, ensure that the communication circuit is normal.
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TROUBLE JUDGMENT
With the ignition switch at the ON position and the system voltage at 10 -16 V (data from ETACS-ECU), if the combination meter detects the abnormal resistance of fuel level sensor circuit for 64 seconds continuously, the diagnosis code No. B1201 is stored.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of fuel pump and gauge assembly
- Malfunction of combination meter
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STEP 1. Connector check: D-19 fuel pump and gauge assembly connector
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Q.
Is the check result normal?
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 Go to Step 2.
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 Repair the connector, and then go to Step 9.
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STEP 2. Fuel pump and gauge assembly check
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Check the fuel pump and gauge assembly. Refer to  .
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Q.
Is the check result normal?
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Go to Step 3.
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Replace the fuel pump and gauge assembly.
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STEP 3. Check of fuel gauge (main) circuit
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(1)Disconnect the D-19 fuel pump and gauge assembly connector.
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(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.
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(3)Turn the ignition switch to the ON position.
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(4)Check if the test lamp illuminates.
OK: Illuminates
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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 4.
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STEP 4. Resistance measurement at the D-19 fuel pump and gauge assembly connector
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(1)Disconnect the fuel pump and gauge unit (main) connector, the measure at the harness side.
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(2)Measure the resistance between the D-19 fuel pump and gauge assembly connector terminal No. 1 and the body earth.
OK: Continuity exists (2 Ω or less)
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Q.
Is the check result normal?
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Go to Step 6.
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Go to Step 5.
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STEP 5. Check the wiring harness between the D-19 fuel pump and gauge assembly connector terminal No. 1 and the body earth.
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Q.
Is the check result normal?
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Go to Step 9.
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Repair the wiring harness, and then go to Step 9.
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STEP 6. Connector check: C-01 combination meter connector
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Q.
Is the check result normal?
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Go to Step 7.
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Repair the connector, and then go to Step 9.
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STEP 7. Check the wiring harness between the C-01 combination meter connector terminal No. 18 and the D-19 fuel pump and gauge assembly connector terminal No. 2
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Before the wiring harness check, check the intermediate connectors C-27 and D-09, and repair them if necessary.
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Q.
Is the check result normal?
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Go to Step 8.
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Repair the wiring harness, and then go to Step 9.
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STEP 8. M.U.T.-III actuator test
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- Item 03: Fuel gauge (target value): 0 →100%
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OK: The fuel gauge operates.
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Q.
Is the check result normal?
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Go to Step 9.
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Replace the combination meter
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STEP 9. Check whether the diagnosis code is reset.
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Check again if the diagnosis code is set to the combination meter.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(3)Check if diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the combination meter
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The diagnosis is complete.
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