Inspection Procedure 9
INSPECTION PROCEDURE 9: Fuel gauge does not work (other meters work).
CIRCUIT OPERATION
- The ignition switch (IG1) circuit is the power supply for the fuel gauge.
- When the float in the fuel level sensor moves, the circuit resistance will change.
- The fuel gauge needle is moved by a change in the circuit current.
TECHNICAL DESCRIPTION (COMMENT)
If only the fuel gauge does not operate, the fuel pump module, the fuel level sensor (sub), the combination meter, wiring harness or connector(s) may be defective.
TROUBLESHOOTING HINTS
- Malfunction of the ECM [M/T] or PCM [A/T]
- Malfunction of the fuel level sensor (sub)
- Malfunction of the fuel pump module
- Malfunction of the combination meter
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A
- MB991223: Harness Set
- MB992006: Extra Fine Probe
STEP 1. Using scan tool MB991958, read the meter system diagnostic trouble code.
Check if an meter system diagnostic trouble code B1201 is set.
(1)Turn the ignition switch "ON" position.
(2)Read the diagnostic trouble code.
(3)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC B1201 set?
YES Diagnose the meter system. Refer to Combination Meter.
NO Go to Step 2.
STEP 2. Using scan tool MB991958, check actuator test.
(1)Turn the ignition switch to the "ON" position.
(2)Set scan tool MB991958 to the actuator test mode.
- Item 11: fuel gauge (Target): 0%
- Fuel gauge shows 0 %
- Item 8D: fuel gauge (Target): 50%
- Fuel gauge shows 50 %
- Item 8E: fuel gauge (Target): 100%
- Fuel gauge shows 100 %
(3)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the check result normal?
YES An intermittent malfunction is suspected. How to Cope With Intermittent Malfunctions.
NO Replace the combination meter.