Infiniti QX56 (JA60). Manual — part 405
EC-272
< COMPONENT DIAGNOSIS >
[VK56DE]
P0461 FUEL LEVEL SENSOR
13. Confirm whether the voltage changes more than 0.03V during step 7 to 10 and 10 to 12.
If NG, go to
WITH GST
NOTE:
Start from step 8, if it is possible to confirm that the fuel cannot be drained by 30 (7-7/8 US gal, 6-5/8
Imp gal) in advance.
1. Prepare a fuel container and a spare hose.
2. Release fuel pressure from fuel line. Refer to
3. Remove the fuel feed hose on the fuel level sensor unit.
4. Connect a spare fuel hose where the fuel feed hose was removed.
5. Turn ignition switch ON.
6. Drain fuel by 30 (7-7/8 US gal, 6-5/8 Imp gal) from the fuel tank using proper equipment.
7. Confirm that the fuel gauge indication varies.
8. Fill fuel into the fuel tank for 30 (7-7/8 US gal, 6-5/8 Imp gal).
9. Confirm that the fuel gauge indication varies.
10. If NG, go to
Diagnosis Procedure
INFOID:0000000005149293
1.
CHECK COMBINATION METER FUNCTION
MWI-5, "METER SYSTEM : System Diagram"
OK or NG
OK
>> GO TO 2.
NG
>> Go to
MWI-33, "Component Inspection"
2.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
and
GI-38, "Intermittent Incident"
>> INSPECTION END
P0462, P0463 FUEL LEVEL SENSOR
EC-273
< COMPONENT DIAGNOSIS >
[VK56DE]
C
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EC
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P0462, P0463 FUEL LEVEL SENSOR
Component Description
INFOID:0000000005149294
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 combination meter. The combination meter 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 vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.
On Board Diagnosis Logic
INFOID:0000000005149295
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. Refer to
This diagnosis indicates the former, to detect open or short circuit malfunction.
DTC Confirmation Procedure
INFOID:0000000005149296
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
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.
1. Turn ignition switch ON.
2. Wait at least 5 seconds.
3. Check 1st trip DTC.
4. If 1st trip DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005149297
1.
CHECK COMBINATION METER FUNCTION
OK or NG
OK
>> GO TO 2.
NG
>> Go to
MWI-33, "Component Inspection"
2.
CHECK INTERMITTENT INCIDENT
BBIA0402E
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0462
0462
Fuel level sensor circuit
low input
An excessively low voltage from the sensor is
sent to ECM.
• Harness or connectors
(The CAN communication line is open or
shorted)
• Harness or connectors
(The sensor circuit is open or shorted)
• Combination meter
• Fuel level sensor
P0463
0463
Fuel level sensor circuit
high input
An excessively high voltage from the sensor is
sent to ECM.
EC-274
< COMPONENT DIAGNOSIS >
[VK56DE]
P0462, P0463 FUEL LEVEL SENSOR
GI-35, "How to Check Terminal"
and
GI-38, "Intermittent Incident"
>> INSPECTION END
P0500 VSS
EC-275
< COMPONENT DIAGNOSIS >
[VK56DE]
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P0500 VSS
Description
INFOID:0000000005149298
NOTE:
• If DTC P0500 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P0500 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
The vehicle speed signal is sent to the combination meter from the “ABS actuator and electric unit (control
unit)” by CAN communication line. The c combination meter then sends a signal to the ECM by CAN commu-
nication line.
On Board Diagnosis Logic
INFOID:0000000005149299
FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode.
DTC Confirmation Procedure
INFOID:0000000005149300
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
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:
Steps 1 and 2 may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a
road test is expected to be easier, it is unnecessary to lift the vehicle.
WITH CONSULT-III
1. Start engine (VDC switch OFF).
2. Read “VHCL SPEED SE” in “DATA MONITOR” mode with CONSULT-III. The vehicle speed on CON-
SULT-III should exceed 10 km/h (6 MPH) when rotating wheels with suitable gear position.
If NG, go to
If OK, go to following step.
3. Select “DATA MONITOR” mode with CONSULT-III.
4. Warm engine up to normal operating temperature.
5. Maintain the following conditions for at least 60 consecutive seconds.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0500
0500
Vehicle speed sensor
The vehicle speed signal sent to ECM is
almost 0 km/h (0 MPH) even when vehicle
is being driven.
• Harness or connectors
(The CAN communication line is open or short-
ed)
• Harness or connectors
(The vehicle speed signal circuit is open or
shorted)
• Wheel sensor
• Combination meter
• ABS actuator and electric unit (control unit)
Detected items
Engine operating condition in fail-safe mode
Vehicle speed sensor
When the fail-safe system for vehicle speed sensor is activated, the cooling fan operates (High) while
engine is running.
ENG SPEED
1,600 - 6,000 rpm
COOLAN TEMP/S
More than 70
°C (158°F)
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