2008 INFINITI QX56 Factory Service Manual

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Page 3585 of 4083

INFINITI QX56 2008 Factory Service Manual TM-38
< COMPONENT DIAGNOSIS >
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000001604008
CAN (Controller Area Network) is a serial communication line for real

TM-38
< COMPONENT DIAGNOSIS >
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000001604008
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic control units are equipped onto a vehicle, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/recei ves data but selectively reads required data only.
On Board Diagnosis LogicINFOID:0000000001604009
• This is an OBD-III self-diagnostic item.
• Diagnostic trouble code “U1000” with CONSULT-III is detected when TCM cannot communicate to other
control units.
Possible CauseINFOID:0000000001604010
Harness or connectors
(CAN communication line is open or shorted.)
DTC Confirmation ProcedureINFOID:0000000001604011
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following proc edure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
3. Start engine and wait for at least 6 seconds.
4. If DTC is detected, go to TM-38, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001604013
1.CHECK CAN COMMUNICATION CIRCUIT
With CONSULT-III1. Turn ignition switch “ON” and start engine.
2. Select “SELF-DIAG RESULTS” mode fo r “TRANSMISSION” with CONSULT-III.
Is any malfunction of the
“U1000” indicated?
YES >> Print out CONSULT-III screen, GO TO LAN section. Refer to LAN-14, "Trouble Diagnosis Flow
Chart".
NO >> INSPECTION END
Revision: March 2010 2008 QX56

Page 3586 of 4083

INFINITI QX56 2008 Factory Service Manual P0615 STARTER RELAYTM-39
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
P0615 STARTER RELAY
DescriptionINFOID:0000000001604014
• TCM prohibits cranking other than at “P” or “N” posit

Page 3587 of 4083

INFINITI QX56 2008 Factory Service Manual TM-40
< COMPONENT DIAGNOSIS >
P0615 STARTER RELAY
1. Turn ignition switch “ON”. (Do not start engine.)
2. Check voltage between the IPDM E/R connector and ground.
OK or NG
OK >> GO TO 5.
NG >> GO

Page 3588 of 4083

INFINITI QX56 2008 Factory Service Manual P0615 STARTER RELAYTM-41
< COMPONENT DIAGNOSIS >
CEF
G H
I
J
K L
M A
B
TM
N
O P
• Refer to TM-39, "DTC Confirmation Procedure".
OK or NG
OK >> INSPECTION END
NG >> GO TO 2.
Revision: March 2010 200

Page 3589 of 4083

INFINITI QX56 2008 Factory Service Manual TM-42
< COMPONENT DIAGNOSIS >
P0700 TRANSMISSION CONTROL
P0700 TRANSMISSION CONTROL
DescriptionINFOID:0000000001604021
The TCM consists of a microcomputer and connectors for signal input and output an

Page 3590 of 4083

INFINITI QX56 2008 Factory Service Manual P0705 TRANSMISSION RANGE SWITCH A
TM-43
< COMPONENT DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
P0705 TRANSMISSION RANGE SWITCH A
DescriptionINFOID:0000000001604026
The transmission range switch detec

P0705 TRANSMISSION RANGE SWITCH A
TM-43
< COMPONENT DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
P0705 TRANSMISSION RANGE SWITCH A
DescriptionINFOID:0000000001604026
The transmission range switch detects the select or lever position and sends a signal to the TCM.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001604027
On Board Diagnosis LogicINFOID:0000000001604028
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0705” with CONSULT-III is detected under the following conditions.
- When TCM does not receive the correct voltage signal from the transmission range switch 1, 2, 3, 4 based
on the gear position.
- When no other position but “P” positi on is detected from “N” positions.
Possible CauseINFOID:0000000001604029
• Harness or connectors
The switch 1, 2, 3, 4 and TCM circuit is open or shorted.
• Transmission range switch 1, 2, 3, 4
DTC Confirmation ProcedureINFOID:0000000001604030
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 2 consecutive seconds. THRTL POS SEN: More than 1.2V
5. If DTC is detected, go to TM-43, "
Diagnosis Procedure".
WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis ProcedureINFOID:0000000001604031
1.CHECK TRANSMISSION RANGE SWITCH CIRCUIT
With CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “SELECTION FROM MENU” in “DATA MONI TOR” mode for “TRANSMISSION” with CONSULT-III.
Item nameCondition Display value
SLCTLVR POSI Selector lever in “N”,“P” positions.
N/P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “4” position. 4
Selector lever in “3” position. 3
Selector lever in “2” position. 2
Selector lever in “1” position. 1
Revision: March 2010 2008 QX56

Page 3591 of 4083

INFINITI QX56 2008 Factory Service Manual TM-44
< COMPONENT DIAGNOSIS >
P0705 TRANSMISSION RANGE SWITCH A
3. Check if correct selector lever position (N/P, R or D) is displayed as selector lever is moved into each posi-
tion.
OK or NG
OK >> G

Page 3592 of 4083

INFINITI QX56 2008 Factory Service Manual P0705 TRANSMISSION RANGE SWITCH A
TM-45
< COMPONENT DIAGNOSIS >
C EF
G H
I
J
K L
M A
B
TM
N
O P
OK >> Replace the control valve with TCM. Refer to TM-201, "Control Valve with TCM and A/T Fluid
Temper

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