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DTC B1201: Fuel information problem
cautionWhenever the ECU is replaced, ensure that the communication circuit is normal.
 
 
 
 
TROUBLE JUDGMENT
With the ignition switch at the "ON" position and DTC No. U1190 is not set, if the combination meter detects the abnormal resistance of fuel level sensor circuit for 64 seconds continuously, DTC No. B1201 is set.
 
 
TROUBLESHOOTING HINTS
  • The fuel pump module [fuel level sensor] may be defective.
  • The combination meter may be defective.
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check of fuel pump module circuit.
(1) Disconnect the fuel pump module connector.
(2) Use the special tool Check harness (MB991219) to connect a test light (12 V - 3.4 W) between the wiring harness connector terminals.
(3) Turn the ignition switch to the "ON" position.
(4) Check if the test light illuminates.
OK: Illuminates
Is the check result normal?
Go to Step 6.
Go to Step 2.
 
STEP 2. Check the fuel level sensor.
Check to see if the fuel level sensor is normal (Refer to ).
Is the check result normal?
Go to Step 3.
Replace the fuel level sensor.
 
STEP 3. Resistance measurement at the fuel pump module connector.
(1) Disconnect the fuel pump module connector, the measure at the harness side.
(2) Measure the resistance between the fuel pump module connector (ground terminal) and ground.
OK: The measured value should be 2 ohm or less.
Does the measured resistance value correspond with this range?
Go to Step 5.
Go to Step 4.
 
STEP 4. Check of open circuit in ground line between fuel pump module connector and ground.
Is the check result normal?
Go to Step 7.
Repair the connector(s) or wiring harness, and then go to Step 7.
 
STEP 5. Check of open circuit in F/G line between combination meter connector and fuel pump module connector.
Is the check result normal?
Go to Step 6.
Repair the connector(s) or wiring harness, and then go to Step 7.
 
STEP 6. Using scan tool (M.U.T.-III), perform actuator test.
  • Item 03: Fuel gauge (target value): 0 →100%
OK: The fuel gauge operates.
Is the check result normal?
Go to Step 7.
Replace the combination meter.
 
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set in the combination meter.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if DTC is set.
Is the DTC set?
Replace the combination meter.
The diagnosis is complete.