Code No.B1201:
Fuel information problem
caution |
Whenever the ECU is replaced, ensure that the
communication circuit is normal.
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TROUBLE JUDGEMENT
With the ignition switch at the ON position and diagnosis code No. U1190 is not set, if
the combination meter detects the abnormal resistance of fuel level sensor circuit for 64 seconds continuously,
diagnosis code No. B1201 is set.
PROBABLE CAUSES
- Damaged harness wires and connectors
- Malfunction of fuel pump and gauge assembly <Petrol>
- Malfunction of fuel pipe and gauge assembly <Diesel>
- Malfunction of combination meter
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STEP 1. Check of fuel pump and gauge assembly <Petrol> or
fuel pipe and gauge assembly <Diesel> circuit
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(1)Disconnect the fuel pump and gauge assembly <Petrol> or fuel pipe and gauge
assembly <Diesel> 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.
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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 6.
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Go to Step 2.
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STEP 2. Fuel pump and gauge assembly <Petrol> or fuel pipe and
gauge assembly <Diesel> check
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Check the fuel pump and gauge assembly <Petrol> or fuel pipe and gauge assembly <Diesel>
(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 <Petrol> or fuel pipe and gauge assembly <Diesel>.
(Refer to GROUP 13D - Fuel Tank ).
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STEP 3. Resistance measurement at the fuel pump and gauge assembly <Petrol>
or fuel pipe and gauge assembly <Diesel> connector
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(1)Disconnect the fuel pump and gauge assembly <Petrol> or fuel pipe and gauge
assembly <Diesel> connector, the measure at the harness side.
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(2)Measure the resistance between the fuel pump and gauge assembly <Petrol> or
fuel pipe and gauge assembly <Diesel> connector (earth terminal) 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 5.
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Go to Step 4.
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STEP 4. Check of open circuit in body earth line between fuel pump
and gauge assembly <Petrol> or fuel pipe and gauge assembly <Diesel> connector and body
earth.
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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(s) or wiring harness, and then go to Step 7.
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STEP 5. Check of open circuit in F/G line between combination meter
connector and fuel pump and gauge assembly <Petrol> or fuel pipe and gauge assembly <Diesel>
connector.
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Q.
Is the check result normal?
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Go to Step 6.
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Repair the connector(s) or wiring harness, and then go to Step 7.
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STEP 6. 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 7.
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Replace the combination meter (Refer to ).
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STEP 7. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set in 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 (Refer to ).
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The diagnosis is complete.
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