combination meter INFINITI QX56 2004 Factory Service Manual

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
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Revision: August 20072004 QX56
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTIONPFP:00000
Trouble Diagnosis without CONSULT-IIEDS0017U
DESCRIPTION
If the engine starts when there is something wrong with the all-mode 4WD system, the 4WD warning lamp
turns ON or flickers in the combination meter. When the system functions properly, the warning lamp turns ON
when the ignition switch is turned to ON, and it turns OFF after engine starts.
To locate the cause of a problem, start the self-diagnosis function. The 4WD warning lamp in the combination
meter will indicate the problem area by flickering according to the self-diagnostic results. As for the details of
the 4WD warning lamp flickering patterns, refer to TF-28
.

TROUBLE DIAGNOSES FOR SYMPTOMS
TF-87
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Revision: August 20072004 QX56
Symptom 2. 4WD Warning Lamp Does Not Turn ON (Although the ignition
switch is turned ON, the 4WD warning lamp does not turn ON)
EDS0018F
1. CHECK TRANSFER CONTROL UNIT POWER SOURCE
1. Turn ignition switch to OFF position and disconnect transfer control unit harness connector E142.
2. Turn ignition switch to ON position (do not start engine).
3. Check voltage between transfer control unit harness connector
E142 terminals 16 (Y/R), 22 (Y/R) and ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.

Continuity between ignition switch and transfer con-
trol unit

Ignition switch and No. 49 fuse (10A)
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit harness connectors E142 and
E143.
3. Measure resistance between transfer control unit harness con-
nectors E142 and E143 terminals 3 (B), 6 (B), 45 (B) and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check continuity between transfer control unit and
ground.
3. CHECK 4WD WARNING LAMP CIRCUIT AND COMBINATION METER
Check the following.

Combination meter. Refer to DI-17, "How to Proceed With Trouble Diagnosis" .

Continuity between ignition switch and combination meter

Continuity between combination meter and transfer control unit
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >>

Repair or replace harness or connector.

Replace combination meter. Refer to DI-25, "Removal and Installation of Combination Meter" .
WDIA0080E
Voltage : Battery voltage
LDIA0089E
Resistance : Continuity should exist.
LDIA0087E

TROUBLE DIAGNOSES FOR SYMPTOMS
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Symptom 4. ATP Warning Lamp Does Not Turn ON (When 4WD shift switch is
set from 4H to 4LO with the A/T selector lever in P position, the ATP warning
lamp does not turn on)
EDS0018H
1. CHECK ATP SWITCH CIRCUIT
Check ATP switch circuit.
Refer to TF-69, "
ATP SWITCH, WAIT DETECTION SWITCH AND
NEUTRAL-4LO SWITCH" .
OK or NG
OK >> GO TO 2.
NG >> Check, repair or replace faulty parts.
2. CHECK COMBINATION METER
Check the combination meter. Refer to DI-17, "
How to Proceed With Trouble Diagnosis"
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >> Replace combination meter. Refer to DI-25, "
Removal and Installation of Combination Meter" .
WDIA0103E

TROUBLE DIAGNOSES FOR SYMPTOMS
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3. CHECK 4LO INDICATOR LAMP CIRCUIT AND COMBINATION METER
Check the following.

Combination meter. Refer to DI-17, "How to Proceed With Trouble Diagnosis" .

Continuity between ignition switch and combination meter

Continuity between combination meter and transfer control unit

Condition of ATP and neutral-4LO switch circuit. Refer to TF-69, "ATP SWITCH, WAIT DETECTION
SWITCH AND NEUTRAL-4LO SWITCH" .
OK or NG
OK >> Replace transfer control unit. Refer to TF-98, "Removal and Installation" .
NG >>

Repair or replace harness or connector.

Replace combination meter. Refer to DI-25, "Removal and Installation of Combination Meter" .

Replace ATP or neutral-4LO switch.
Symptom 6. 4WD Shift Indicator Lamp Does Not Indicate “LOCK” (When 4WD
shift switch is set to “4H”, 4WD shift indicator lamp does not indicate “LOCK”)
EDS0018J
1. CHECK 4WD WARNING LAMP
Is 4WD warning lamp turned ON?
Ye s o r N o
Yes >> Refer to TF-27, "Trouble Diagnosis without CONSULT-
II" .
No >> GO TO 2.
2. CHECK NEUTRAL-4LO, WAIT DETECTION AND ATP SWITCH CIRCUITS
Check neutral-4LO, wait detection and ATP switch circuits. Refer to TF-69, "
ATP SWITCH, WAIT DETECTION
SWITCH AND NEUTRAL-4LO SWITCH" .
OK or NG
OK >> GO TO 3.
NG >> Check, repair or replace faulty parts.
3. CHECK PROCEDURES FROM THE BEGINNING AGAIN
Check again.
OK or NG
OK >> Inspection End.
NG >> Recheck each connector pin terminals for damage or loose connection.
WDIA0071E

TROUBLE DIAGNOSES
WT-17
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Self-DiagnosisEES0012D
DESCRIPTION
During driving, the low tire pressure warning system receives the signal transmitted from the transmitter
installed in each wheel, and gives alarms when the tire pressure becomes low. The control unit (BCM) for this
system has pressure judgement and trouble diagnosis functions.
FUNCTION
When the low tire pressure warning system detects low inflation pressure or another unusual symptom, the
warning lamp in the combination meter comes on. To start the self-diagnostic results mode, ground the tire
pressure warning check terminal. The malfunction location is indicated by the low tire pressure warning lamp
flashing and the buzzer sounding.
CONSULT-II
CONSULT-II Application to Low Tire Pressure Warning System
× : Applicable
– : Not applicable
Self-Diagnostic Results Mode
NOTE:
Before performing the self-diagnosis, be sure to register the ID or the actual malfunction location may be different from that displayed on
CONSULT-II.ITEM SELF-DIAGNOSTIC RESULTS DATA MONITOR
Front - Left transmitter××
Front - Right transmitter××
Rear - Left transmitter××
Rear - Right transmitter××
Low tire pressure warning lamp —×
Vehicle speed××
Buzzer (in combination meter) —×
CAN Communication××
Diagnostic item Diagnostic item is detected when ···
FLAT - TIRE - FL
FLAT - TIRE - FR
FLAT - TIRE - RR
FLAT - TIRE - RLFront-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
[NO-DATA] - FL
[NO-DATA] - FR
[NO-DATA] - RR
[NO-DATA] - RLData from front-left transmitter cannot be received.
Data from front-right transmitter cannot be received.
Data from rear-right transmitter cannot be received.
Data from rear-left transmitter cannot be received.
[CHECKSUM- ERR] - FL
[CHECKSUM- ERR] - FR
[CHECKSUM- ERR] - RR
[CHECKSUM- ERR] - RLChecksum data from front-left transmitter is malfunctioning.
Checksum data from front-right transmitter is malfunctioning.
Checksum data from rear-right transmitter is malfunctioning.
Checksum data from rear-left transmitter is malfunctioning.
[PRESSDATA- ERR] - FL
[PRESSDATA- ERR] - FR
[PRESSDATA- ERR] - RR
[PRESSDATA- ERR] - RLAir pressure data from front-left transmitter is malfunctioning.
Air pressure data from front-right transmitter is malfunctioning.
Air pressure data from rear-right transmitter is malfunctioning.
Air pressure data from rear-left transmitter is malfunctioning.
[CODE- ERR] - FL
[CODE- ERR] - FR
[CODE- ERR] - RR
[CODE- ERR] - RLFunction code data from front-left transmitter is malfunctioning.
Function code data from front-right transmitter is malfunctioning.
Function code data from rear-right transmitter is malfunctioning.
Function code data from rear-left transmitter is malfunctioning.
[BATT - VOLT - LOW] - FL
[BATT - VOLT - LOW] - FR
[BATT - VOLT - LOW] - RR
[BATT - VOLT - LOW] - RLBattery voltage of front-left transmitter drops.
Battery voltage of front-right transmitter drops.
Battery voltage of rear-right transmitter drops.
Battery voltage of rear-left transmitter drops.
VHCL_SPEED_SIG_ERR Vehicle speed signal is in error.

WT-18
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Data Monitor Mode
NOTE:
Before performing the self-diagnosis, be sure to register the ID, or the actual malfunction location may be different from that displayed on
CONSULT-II.MONITOR CONDITION SPECIFICATION
VHCL SPEED Drive vehicle. Vehicle speed (km/h or MPH)
AIR PRESS FL
AIR PRESS FR
AIR PRESS RR
AIR PRESS RL

Drive vehicle for a few minutes.
Tire pressure (kPa or psi) or

Ignition switch ON and activation tool
is transmitting activation signals.
ID REGST FL1
ID REGST FR1
ID REGST RR1
ID REGST RL1
Ignition switch ONRegistration ID: DONE
No registration ID: YET
WAR NIN G LAMPLow tire pressure warning lamp on: ON
Low tire pressure warning lamp off: OFF
BUZZERBuzzer in combination meter on: ON
Buzzer in combination meter off : OFF

WT-20
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Preliminary CheckEES0012F
BASIC INSPECTION
1. CHECK ALL TIRE PRESSURES
Check all tire pressures. Refer to WT-33, "
Tire" .
OK or NG
OK >> GO TO 2.
NG >> Adjust tire pressure to specified value.
2. CHECK LOW TIRE PRESSURE WARNING LAMP ACTIVATION
Check low tire pressure warning lamp activation.
Does low tire pressure warning lamp activate for 1 second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> Check fuse and combination meter.
3. CHECK CONNECTOR
1. Disconnect BCM harness connector.
2. Check terminals for damage or loose connection.
3. Reconnect harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMITTER ACTIVATION TOOL
Check transmitter activation tool battery.
OK or NG
OK >> Carry out self-diagnosis.
NG >> Replace transmitter activation tool battery.

TROUBLE DIAGNOSES
WT-21
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Malfunction Code/Symptom ChartEES0012G
Code/Symptom Malfunction partReference
page
15
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18Front-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less—
21
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24Transmitter no data (front - left)
Transmitter no data (front - right)
Transmitter no data (rear - right)
Transmitter no data (rear - left)WT-23,
"Inspection 1:
Transmitter or
Control Unit
(BCM)"
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34Transmitter checksum error (front - left)
Transmitter checksum error (front - right)
Transmitter checksum error (rear - right)
Transmitter checksum error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
35
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38Transmitter pressure data error (front - left)
Transmitter pressure data error (front - right)
Transmitter pressure data error (rear - right)
Transmitter pressure data error (rear - left)WT-24,
"Inspection 3:
Tran s mitte r -
2"
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44Transmitter function code error (front - left)
Transmitter function code error (front - right)
Transmitter function code error (rear - right)
Transmitter function code error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
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48Transmitter battery voltage low (front - left)
Transmitter battery voltage low (front - right)
Transmitter battery voltage low (rear - right)
Transmitter battery voltage low (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
52 Vehicle speed signalWT-25, "Inspection 4:
Vehicle Speed
Signal"
Low tire pressure warning lamp does
not come on when ignition switch is
turned on.Fuse or combination meter
BCM connector or circuit
BCM WT-26,
"Inspection 1:
Low Tire
Pressure
Warning
Lamp Does
Not Come On
When Ignition
Switch Is
Turned On"
Low tire pressure warning lamp stays
on when ignition switch is turned on.Combination meter
BCM connector or circuit
BCMWT-26,
"Inspection 2:
Low Tire
Pressure
Warning
Lamp Stays
On When
Ignition
Switch Is
Turned On"

WT-26
TROUBLE DIAGNOSIS FOR SYMPTOMS
Revision: August 20072004 QX56
TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
Inspection 1: Low Tire Pressure Warning Lamp Does Not Come On When Igni-
tion Switch Is Turned On
EES001PV
DIAGNOSTIC PROCEDURE
1. SELF-DIAGNOSTIC RESULT CHECK
1. With the ignition switch OFF, connect CONSULT-II and CONSULT-II CONVERTER to the data link con-
nector, then turn the ignition switch ON.
2. Select “START (NISSAN BASED VHCL)”.
3. Select "BCM" on “SELECT SYSTEM” screen.
NOTE:
If the BCM is not indicated, refer to LAN-5, "
CAN COMMUNICATION" .
4. Select "BCM" on "SELECT TEST ITEM" screen, and select "SELF-DIAG RESULTS".
5. Check display contents in self-diagnostic results.
Is "CAN COMM CIRCUIT" displayed in the self-diagnosis display items?
YES >> Malfunction in CAN communication system. Go To LAN-5, "CAN COMMUNICATION" .
NO >> GO TO 2.
2. CHECK COMBINATION METER
Check combination meter operation. Refer to DI-8, "
Combination Meter"
Inspection results OK?
OK >> GO TO 3.
NG >> Replace combination meter. Refer to IP-13, "
Combination Meter" .
3. CHECK LOW TIRE PRESSURE WARNING LAMP
Disconnect BCM harness connector.
Does the low tire pressure warning lamp activate?
YES >> Replace BCM. Refer to BCS-19, "Removal and Installation of BCM" .
NO >> Check combination meter and repair or replace.
Inspection 2: Low Tire Pressure Warning Lamp Stays On When Ignition Switch
Is Turned On
EES0012M
DIAGNOSTIC PROCEDURE
1. CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect BCM harness connectors M18 and M20.
3. Check terminals for damage or loose connections.
Inspection results OK?
OK >> GO TO 2.
NG >> Repair or replace damaged parts.