B1201
DTC B1201: Abnormal fuel information
CAUTION:
Whenever the ECU is replaced, ensure that the communication circuit is normal.
TROUBLE JUDGMENT
With the ignition switch at the ON position and the system voltage at 10 -16 volts (data from ETACS-ECU), if the combination meter detects the abnormal resistance of fuel level sensor circuit for 64 seconds continuously, DTC B1201 is stored.
TROUBLESHOOTING HINTS
- The fuel pump module [fuel level sensor (main)] may be defective. [FWD, AWD]
- The fuel level sensor (sub) may be defective. [AWD]
- 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
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Check the malfunctioning vehicle.
Q. Is the malfunctioning vehicle a FWD?
YES [FWD] : Go to Step 2.
NO [AWD] : Go to Step 8.
STEP 2. Check fuel pump module connector D-20 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is fuel pump module connector D-20 in good condition?
YES Go to Step 3.
NO Repair the connector.
STEP 3. Check the fuel level sensor (main).
Check to see if the fuel level sensor (main) is normal. Refer to Fuel Gauge Unit Check.
Q. Is the check result normal?
YES Go to Step 4.
NO Replace the fuel level sensor (main).
STEP 4. Measure the resistance at fuel pump module connector D-20.
(1)Disconnect pump module connector D-20, and measure at the wiring harness side.
(2)Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohm or less.
Q. Does the measured resistance value correspond with this range?
YES Go to Step 6.
NO Go to Step 5.
STEP 5. Check the wiring harness between fuel pump module connector D-20 (terminal 1) and ground.
- Check the ground wire for open circuit.
Q. Is the wiring harness between fuel pump module connector D-20 (terminal 1) and ground in good condition?
YES There is no action to be taken.
NO Repair the wiring harness.
STEP 6. Check combination meter connector C-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is combination meter connector C-03 in good condition?
YES Go to Step 7.
NO Repair the connector.
STEP 7. Check the wiring harness between fuel pump module connector D-20 (terminal 2) and combination meter connector C-03 (terminal 17 or 18).
- Check the communication lines for open circuit and short circuit.
NOTE:
Also check intermediate connectors C-31 and D-05. If intermediate connectors C-31 and D-05 are damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Are the wiring harness between fuel pump module connector D-20 (terminal 2) and combination meter connector C-03 (terminal 17 or 18) in good condition?
YES Go to Step 14.
NO Repair the wiring harness. The fuel gauge should work normally.
STEP 8. Check fuel pump module connector D-20 and fuel level sensor (sub) connector D-22 [AWD] for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is fuel pump module connector D-20 and fuel level sensor (sub) connector D-22 [AWD] in good condition?
YES Go to Step 9.
NO Repair the connector.
STEP 9. Check the fuel level sensor (main) and (sub)
Check to see if the fuel level sensor (main) and (sub) is normal. Refer to Fuel Gauge Unit Check.
Q. Is the check result normal?
YES Go to Step 10.
NO Replace the fuel level sensor (main) or (sub).
STEP 10. Measure the resistance at fuel pump module connector D-20.
(1)Disconnect fuel pump module connector D-20, and measure at the wiring harness side.
(2)Measure the resistance value between terminal 1 and ground.
- The measured value should be 2 ohm or less.
Q. Does the measured resistance value correspond with this range?
YES Go to Step 12.
NO Go to Step 11.
STEP 11. Check the wiring harness between fuel pump module connector D-20 (terminal 1) and ground.
- Check the ground wire for open circuit.
Q. Is the wiring harness between fuel pump module connector D-20 (terminal 1) and ground in good condition?
YES There is no action to be taken.
NO Repair the wiring harness.
STEP 12. Check combination meter connector C-03 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q. Is combination meter connector C-03 in good condition?
YES Go to Step 13.
NO Repair the connector.
STEP 13. Check the wiring harness between fuel pump module connector D-20 (terminal 2) and combination meter connector C-03 (terminal 17 or 18).
- Check the communication lines for open circuit and short circuit.
NOTE:
Also check intermediate connectors C-31 and D-05. If intermediate connectors C-31 and D-05 are damaged, repair or replace the connector as described in Harness Connector Inspection Harness Connector Inspection.
Q. Are the wiring harness between fuel pump module connector D-20 (terminal 2) and combination meter connector C-03 (terminal 17 or 18) in good condition?
YES Go to Step 14.
NO Repair the wiring harness. The fuel gauge should work normally.
STEP 14. Using scan tool MB991958, perform actuator test.
- Item 03: Fuel gauge (target value): 0 ->100%
- Fuel gauge shows 100 %
Q. Is the check result normal?
YES Go to Step 15.
NO Replace the combination meter.
STEP 15. Recheck for diagnostic trouble code.
Check again if the DTC is set to 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.
Q. Is the DTC set?
YES Replace the combination meter.
NO The procedure is complete.