2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 540
Description
The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the "unified meter and A/C amp.". The "unified meter and A/C amp."
sends the fuel level sensor signal to the ECM through CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the
movement of the fuel mechanical float.
DTC Logic
DTC DETECTION LOGIC
NOTE:
- If DTC P0462 or P0463 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC
UXXXX.
- If DTC P0462 or P0463 is displayed with DTC P0607, first perform the trouble diagnosis for DTC
P0607. See: P Code Charts/P0607.
This diagnosis indicates the former, to detect open or short circuit malfunction.
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11 V at ignition switch ON.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON and wait at least 5 seconds.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to See: P Code Charts/P0462.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK DTC WITH "UNIFIED METER AND A/C AMP."
.
Is the inspection result normal?
YES - GO TO 2.
NO - Go to See: Instrument Panel, Gauges and Warning Indicators/Testing and Inspection/Component Tests and General
Diagnostics/Combination Meter/Fuel Level Sensor Signal Inspection.
2.CHECK INTERMITTENT INCIDENT
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Trouble
Diagnosis For Intermittent Incident/Description.
- INSPECTION END
P0463
P0462, P0463 FUEL LEVEL SENSOR
Description
The fuel level sensor is mounted in the fuel level sensor unit.
The sensor detects a fuel level in the fuel tank and transmits a signal to the "unified meter and A/C amp.". The "unified meter and A/C amp."
sends the fuel level sensor signal to the ECM through CAN communication line.
It consists of two parts, one is mechanical float and the other is variable resistor. Fuel level sensor output voltage changes depending on the
movement of the fuel mechanical float.
