2007 INFINITI QX56 fuel

DI-12
< SERVICE INFORMATION >
COMBINATION METERS
Self-Diagnosis Mode of Combination Meter
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SELF-DIAGNOSIS FUNCTION
The following items can be checked during Combination Meter Self-Diagnosis Mode.
• Gauge sweep and present gauge values.
• Illuminates all odometer, fuel, and engine temperature segments.
• Illuminates all micro controlled lamps/LE D's regardless of switch configuration.
• Displays estimated present battery voltage.
• Displays seat belt buckle switch LH status.
HOW TO INITIATE COMBINATION METER SELF- DIAGNOSIS MODE
NOTE:
Once entered, Combination Meter Self-Diagnosis Mode will function with the ignition switch in ON or START.
Combination Meter Self-Diagnosis Mode will exit upon turning the ignition switch to OFF or ACC.
To initiate Combination Meter Self-Diagnosis Mode, refer to the following procedure.
1. Turn the ignition switch ON, while holding the odom eter/trip meter switch for 5 - 8 seconds. When the
diagnosis function is activated the odometer/trip meter will display tESt.
NOTE:
Check combination meter power supply and ground ci rcuit when self-diagnosis mode of combination
meter does not start. Refer to DI-16, "
Power Supply and Ground Circuit Inspection". Replace combination
meter if normal. Refer to IP-10, "
Removal and Installation".
COMBINATION METER SELF-DIAGNOSIS MODE FUNCTIONS
To interpret Combination Meter Self-Diagnosis Mode functions, refer to the following table.
37 W/L Washer fluid level switch ON Washer fluid level low 0
Washer fluid level normal Battery voltage
Te r m i n a l
No. Wire
color Item Condition
Reference value (V)
(Approx.)
Ignition
switch Operation or condition
Event Odometer Display Description of Test/Data Notes:
Odometer/trip meter A/B
switch held from 5 to 8
seconds (or until re-
leased) tESt Initiating self-diagnosis mode
Odometer/trip meter A/B
switch engaged and re-
leased = next test re-
quested rXXXX, FAILReturn to normal opera-
tion of all lamps/LEDs and
displays hex ROM rev. If a
ROM checksum fault ex-
ists, display alternates be-
tween "r XXXX" and
"FAIL".
Next test requested nrXXXX Displays hex ROM rev as
stored in NVM.
Next test requested Sc1XX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-3 = reserved for future use
2 = TCS/VDC 0 = not present
1 = present
1 = Shift type 0 = Column shift
1 = Floor shift
0 = ICC 0 = not present
1 = present
Next test requested Sc2XX Displays 8-bit software
configuration value in Hex
format.Bit coding
7-0 = Reserved for future use

COMBINATION METERSDI-13
< SERVICE INFORMATION >
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Next test requested EprXX Displays 8-bit software
configuration value in Hex
format.Bit Coding
7-2 = reserved for future use
1 = A/T Oil Temp (gauge)
0 = not present
1 = present
1 = Odo Units 0 = kilometers
1 = miles
Next test requested 1nFXX Displays 8-bit market info
value in Hex format.$31 = USA
$2A = Canada
Next test requested cYLXX Displays 8-bit engine con-
figuration value in Hex for-
mat.$08 = 8 cylinder
$06 = 6 cylinder
Next test requested bulb Illuminates all micro-con-
trolled lamps/LEDs re-
gardless of SW
configuration.
Next test requested D-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full daytime brightness all LCD
segments active
Next test requested N-HI Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Full nighttime brightness all
LCD segments active
Next test requested N-LO Meter/LCD Illumination.
Next test requested (All segments illuminated) Lights all odometer/trip
meter, fuel, and engine
temperature display seg-
ments.Min. nighttime brightness all
LCD segments active
Next test requested dS XX Current dimming step. 1-21
Next test requested EE XX, FAIL Hex EE level. If EE check-
sum fault exists, display
alternates between "EE
XX" and "FAIL".
Next test requested dtXXXX Hex coding of final manu-
facturing test date.
Next test requested GAGE Performs sweep of all
gauges, then displays
present gauge values.
Performs checksum tests
on ROM and EE.Gauges sweep within 10 sec-
onds
Next test requested FFXXXX Displays 16-bit fuel flow
constant "Q" in tenths of
cc/min in Hex format.$0000 - $FFFF
Next test requested tF Displays 16-bit tire factor
"A" in hundredths in Hex
format.$0000 - $FFFF
Next test requested oP Current oil pressure value
in A/D counts in hex for-
mat.
$00 - $FF
Next test requested ot1XX Displays oil pressure tell-
tale "on" threshold in A/D
counts in Hex format.$00 - $FF
Event Odometer Display Description of Test/Data Notes:

DI-14
< SERVICE INFORMATION >
COMBINATION METERS
Next test requested ot0XXDisplays oil pressure tell-
tale "off" threshold in A/D
counts in Hex format.$00 - $FF
Next test requested XXXXX Raw uncompensated en-
glish speed value in hun-
dredths of MPH.
Speedometer indicates
present speed.Will display "-----"
if message is
not received. Will display
"99999" if data received is in-
valid
Next test requested XXXXX Raw uncompensated
metric speed value in hun-
dredths of KPH. Speed-
ometer indicates present
speed.Will display "-----"
if message is
not received. Will display
"99999" if data received is in-
valid
Next test requested tXXXX Tachometer value in
RPM. Tachometer indi-
cates present RPM.Will display "-----"
if message is
not received.
Next test requested F1 XXXX Present ratioed fuel level
A/D input 1 in decimal for-
mat. Fuel gauge indicates
present filtered level.000-009 = Short circuit
010-254 = Normal range
255 = Open circuit
--- = Missing 5 seconds
Next test requested F2 XXX Present FLPS. 010-254 normal range
Next test requested FS X Fuel filter rate 0 = Normal
1 = Fast
Next test requested XXXC Last temperature gauge
input value in degrees C.
Temperature gauge indi-
cates present filtered tem-
perature.Will display "---"
C if message is
not received.
Will display "999" if data re-
ceived is invalid.
Next test requested BAtXX.X Estimated present battery
voltage.
Next test requested rES -X Seat belt buckle switch LH
status.0 = Unbuckled
1 = Buckled
Next test requested PA -XX Hex value port A.
Next test requested Pb -XX Hex value port B.
Next test requested PE -XX Hex value port E.
Next test requested PL -XX Hex value port L.
Next test requested P6 -XX Hex value port K.
Next test requested Pn -XX Hex value port M.
Next test requested PP -XX Hex value port P.
Next test requested PS -XX Hex value port S.
Next test requested Pt -XX Hex value port T.
Next test requested Pu -XX Hex value port U.
Next test requested P4 -XX Hex value port V.
Next test requested Puu -XX Hex value port W.
Next test requested A00XXX A/D port A/D value (non-
ratioed).0-255
Next test requested A01XXX A/D port A/D value (non-
ratioed).
0-255
Next test requested A02XXX A/D port A/D value (non-
ratioed).0-255
Next test requested A03XXX A/D port A/D value (non-
ratioed).0-255
Event Odometer Display Description of Test/Data Notes:

DI-16
< SERVICE INFORMATION >
COMBINATION METERS
Perform self-diagnosis mode of combination meter. Refer to DI-12, "Self-Diagnosis Mode of Combination
Meter".
Does self-diagnosis mode operate normally?
YES >> GO TO 3.
NO >> Check combination meter power supply and ground circuit. Refer to DI-16, "
Power Supply and
Ground Circuit Inspection".
3.CHECK ODOMETER OPERATION
Check segment display status of odometer.
Is the display normal?
YES >> GO TO 4.
NO >> Replace the combination meter. Refer to IP-10,
"Removal and Installation".
4.CHECK COMBINATION METER CIRCUIT
Check indication of each meter/gauge in self-diagnosis mode.
OK or NG
OK >> Go to DI-16, "Symptom Chart".
NG >> Replace the combination meter. Refer to IP-10,
"Removal and Installation".
Symptom ChartINFOID:0000000003533489
Power Supply and Ground Circuit InspectionINFOID:0000000003533490
1.CHECK FUSES
Check for blown combination meter fuses.
WKIA1531E
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Trouble phenomenon Possible cause
Improper tachometer indication. Refer to DI-18, "
Engine Speed Signal Inspection".
Improper water temperature gauge indication. Refer to DI-18, "
Water Temperature Signal Inspection".
Improper speedometer or odometer. Refer to DI-17, "
Vehicle Speed Signal Inspection".
Improper fuel gauge indication. Refer to DI-18, "
Fuel Level Sensor Unit Inspection".
Fuel warning lamp indication is irregular.
Improper A/T oil temperature gauge indication Refer to AT- 11 9
.
Improper voltage gauge indication Replace combination meter. Refer to IP-10, "
Removal and Instal-
lation".
More than one gauge does not give proper indication.
Improper A/T position indication. Refer to DI-34
.
Illumination control does not operate properly. Refer to LT- 1 2 0
.

DI-18
< SERVICE INFORMATION >
COMBINATION METERS
Self-diagnostic results content
No malfunction detected>>GO TO 2.
Malfunction detected>>GO TO PG-18, "
CONSULT-II Function (IPDM E/R)".
2.CHECK IPDM E/R INPUT SIGNAL
Select "IPDM E/R" on CONSULT-II. Operate ignition switch with "OIL
P SW" of "DATA MONITOR" and check operation status.
OK or NG
OK >> Replace combination meter. Refer to IP-10, "Removal
and Installation".
NG >> GO TO 3.
3.CHECK OIL PRESSURE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector E122 and oil pressure switch
connector F4.
3. Check continuity between IPDM E/R harness connector E122 (A) terminal 42 and oil pressure switch harness connector F4 (B)
terminal 1.
OK or NG
OK >> GO TO 4.
NG >> Repair harness or connector.
4.CHECK OIL PRESSURE SWITCH
Check oil pressure switch. Refer to DI-21, "
Electrical Component Inspection".
OK or NG
OK >> Replace IPDM E/R. Refer to PG-28, "Removal and Installation of IPDM E/R".
NG >> Replace oil pressure switch.
Water Temperature Signal InspectionINFOID:0000000003533493
1.CHECK ECM SELF-DIAGNOSIS
Perform ECM self-diagnosis. Refer to E C - 111 , "
CONSULT-II Function (ENGINE)".
OK or NG
OK >> Replace the combination meter. Refer to IP-10, "Removal and Installation".
NG >> Perform "Diagnostic procedure" for displayed DTC. Refer to EC-82
.
Engine Speed Signal InspectionINFOID:0000000003533494
1.CHECK ECM SELF-DIAGNOSIS
Perform ECM self-diagnosis. Refer to E C - 111 , "
CONSULT-II Function (ENGINE)".
OK or NG
OK >> Replace the combination meter. Refer to IP-10, "Removal and Installation".
NG >> Perform "Diagnostic procedure" for displayed DTC. Refer to EC-82
.
Fuel Level Sensor Unit InspectionINFOID:0000000003533495
FUEL LEVEL SENSOR UNIT
The following symptoms do not indicate a malfunction.When ignition switch is in ON
position (Engine stopped)
: OIL P SW CLOSE
When engine running : OIL P SW OPEN
LKIA0403E
Continuity should exist.
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COMBINATION METERSDI-19
< SERVICE INFORMATION >
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• Depending on vehicle position or driving circumstance, the fuel in the tank shifts and the indication may fluc-
tuate.
• If the vehicle is fueled with the ignition switch ON, the indication will update slowly.
• If the vehicle is tilted when the ignition switch is turned ON, fuel in the tank may flow to one direction result-
ing in a change of reading.
LOW-FUEL WARNING LAMP
Depending on vehicle posture or driving circumstances, the fuel level in the tank varies, and the warning lamp
ON timing may be changed.
1.CHECK SELF-DIAGNOSIS
Perform the combination meter self-diagnosis. Refer to DI-12, "
Self-Diagnosis Mode of Combination Meter".
OK or NG
OK >> GO TO 2.
NG >> Replace the combination meter. Refer to IP-10, "
Removal and Installation".
2.CHECK HARNESS CONNECTOR
1. Turn the ignition switch OFF.
2. Check combination meter and fuel level sensor unit and fuel pump terminals (meter-side, and harness-
side) for poor connection.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace terminals or connectors.
3.CHECK HARNESS CONNECTOR OUTPUT SIGNAL
1. Disconnect fuel level sensor unit and fuel pump connector.
2. Turn ignition switch ON.
3. Check voltage between combination meter harness connector M24 terminal 15 and ground.
OK or NG
OK >> GO TO 4.
NG >> Replace the combination meter. Refer to IP-10,
"Removal and Installation".
4.CHECK HARNESS FOR OPEN OR SHORT CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect combination meter connector M24.
3. Check continuity between combination meter harness connector M24 (B) terminal 15 and fuel level sensor unit and fuel pump
harness connector C5 (A) terminal 2.
4. Check continuity between fuel level sensor unit and fuel pump harness connector C5 (A) terminal 2 and ground.
OK or NG
OK >> GO TO 5.
NG >> Repair harness or connector.
5.CHECK FUEL LEVEL SENSOR CIRCUIT Battery voltage should exist.
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Continuity should exist.
Continuity should not exist.
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DI-20
< SERVICE INFORMATION >
COMBINATION METERS
1. Check continuity between combination meter harness connectorM24 (B) terminal 16 and fuel level sensor unit and fuel pump
harness connector C5 (A) terminal 5.
2. Check continuity between fuel level sensor unit and fuel pump harness connector C5 (A) terminal 5 and ground.
OK or NG
OK >> GO TO 6.
NG >> Repair harness or connector.
6.CHECK FUEL LEVEL SENSOR UNIT
Check the fuel level sensor unit. Refer to DI-21, "
Electrical Component Inspection".
OK or NG
OK >> GO TO 7.
NG >> Replace the fuel level sensor unit. Refer to FL-5, "
Removal and Installation".
7.CHECK INSTALLATION CONDITION
Check fuel level sensor unit installation, and determine whet her the float arm interferes or binds with any of the
internal components in the fuel tank.
OK or NG
OK >> Replace the combination meter. Refer to IP-10, "Removal and Installation".
NG >> Install the fuel level sensor unit properly.
Fuel Gauge Fluctuat es, Indicates Wrong Value, or VariesINFOID:0000000003533496
1.CHECK FUEL GAUGE FLUCTUATION
Test drive vehicle to see if gauge fluctuates only during driving or just before or just after stopping.
Does the indication value vary only during driving or just before or just after stopping?
YES >> The fluctuation may be caused by fuel leve l change in the fuel tank. Condition is normal.
NO >> Ask the customer about the situation when the symptom occurs in detail, Refer to DI-18, "
Fuel
Level Sensor Unit Inspection".
Fuel Gauge Does Not Move to Full-positionINFOID:0000000003533497
1.CHECK POINTER MOVEME NT TO FULL-POSITION
Does it take a long time for the pointer to move to full-position?
YES or NO
YES >> GO TO 2.
NO >> GO TO 3.
2.CHECK IGNITION SWITCH POSITION
Was the vehicle fueled with the ignition switch ON?
YES or NO
YES >> Be sure to fuel the vehicle with the ignition s witch OFF. Otherwise, it will take a long time for the
pointer to move to full-position because of the characteristic of the fuel gauge.
NO >> GO TO 3.
3.OBSERVE VEHICLE POSITION
Is the vehicle parked on an incline?
YES or NO
YES >> Check the fuel level indication with vehicle on a level surface.
NO >> GO TO 4. Continuity should exist.
Continuity should not exist.
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COMBINATION METERS
DI-21
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4.CHECK POINTER MOVEMENT TO EMPTY-POSITION
During driving, does the fuel gauge move gradually toward empty-position?
YES or NO
YES >> Check the fuel level sensor unit. Refer to DI-21, "Electrical Component Inspection".
NO >> Check fuel level sensor unit installation, and determine whether the float arm interferes or binds
with any of the internal components in the fuel tank.
Electrical Component InspectionINFOID:0000000003533498
FUEL LEVEL SENSOR UNIT CHECK
For removal, refer to FL-5, "Removal and Installation".
Check Fuel Level Sensor Unit and Fuel Pump
Check resistance between fuel level sensor unit and fuel pump con-
nector terminals 2 and 5.
*1 and *2: When float rod is in contact with stopper.
OIL PRESSURE SWITCH CHECK
Check continuity between the oil pressure switch and body ground.
Removal and Installation of Combination MeterINFOID:0000000003533499
Refer to "Removal and Installation of Combination Meter" for removal and installation procedures.
Terminals Float position mm (in)Resistance
value Ω
(Approx.)
25*1 Empty 25.86 (1.02) 81.66
*2 Full 254.6 (10.02) 6.98
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ConditionOil pressure
kPa (kg/cm2, psi)Continuity
Engine stopped Less than 29 (0.3, 4) Yes
Engine running More than 29 (0.3, 4) No
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