Infiniti QX4 (R50). Manual — part 42
Diagnostic Procedure
NBAT0058
1
CHECK VALVE RESISTANCE
1. Turn ignition switch to “OFF” position.
2. Disconnect terminal cord assembly connector on the right side of transfer assembly.
3. Check resistance between terminal 6 and ground.
SAT162J
Is resistance approx. 2.5 - 5
Ω
?
Yes
©
GO TO 3.
No
©
GO TO 2.
2
CHECK VALVE OPERATION
1. Remove control valve assembly.
Refer to AT-273.
2. Check the following items:
I
Line pressure solenoid valve
Refer to “Component Inspection”, AT-167.
I
Harness of terminal cord assembly for short or open
OK or NG
OK
©
GO TO 3.
NG
©
Repair or replace damaged parts.
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0745 LINE PRESSURE SOLENOID VALVE
Diagnostic Procedure
AT-165
3
CHECK POWER SOURCE AND DROPPING RESISTOR CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Disconnect TCM harness connector.
3. Check resistance between terminal 6 and TCM harness connector terminal 2.
SAT522J
Is resistance approx. 11.2 - 12.8
Ω
?
Yes
©
GO TO 5.
No
©
GO TO 4.
4
DETECT MALFUNCTIONING ITEM
Check the following items:
I
Dropping resistor
Refer to “Component Inspection”, AT-167.
I
Harness for short or open between TCM terminal 2 and terminal cord assembly (Main harness)
OK or NG
OK
©
GO TO 5.
NG
©
Repair or replace damaged parts.
5
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “OFF” position.
2. Check continuity between terminal 6 and TCM harness connector terminal 1. Refer to wiring diagram — AT — LPSV.
Continuity should exist.
If OK, check harness for short to ground or to power.
3. Reinstall any part removed.
Yes
©
GO TO 6.
No
©
Repair or replace harness between TCM terminal 1 and terminal cord assembly.
6
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-163.
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 7.
DTC P0745 LINE PRESSURE SOLENOID VALVE
Diagnostic Procedure (Cont’d)
AT-166
7
CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK
©
INSPECTION END
NG
©
Repair or replace damaged parts.
SAT657I
Component Inspection
NBAT0059
LINE PRESSURE SOLENOID VALVE
NBAT0059S01
I
For removal, refer to AT-273.
Resistance Check
NBAT0059S0101
I
Check resistance between terminal 6 and ground.
Solenoid valve
Terminal No.
Resistance (Approx.)
Line pressure solenoid valve
6
Ground
2.5 - 5
Ω
SAT658I
Operation Check
NBAT0059S0102
I
Check solenoid valve by listening for its operating sound while
applying battery voltage to the terminal 6 and ground.
SAT848BD
DROPPING RESISTOR
NBAT0059S02
I
Check resistance between two terminals.
Resistance: 11.2 - 12.8
Ω
GI
MA
EM
LC
EC
FE
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0745 LINE PRESSURE SOLENOID VALVE
Diagnostic Procedure (Cont’d)
AT-167
SAT341H
Description
NBAT0060
Shift solenoid valves A and B are turned “ON” or “OFF” by the TCM
in response to signals sent from the PNP switch, vehicle speed and
throttle position sensors. Gears will then be shifted to the optimum
position.
Gear position
1
2
3
4
Shift solenoid valve A
ON (Closed)
OFF (Open)
OFF (Open)
ON (Closed)
Shift solenoid valve B
ON (Closed)
ON (Closed)
OFF (Open)
OFF (Open)
TCM TERMINALS AND REFERENCE VALUE
NBAT0060S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
(Approx.)
11
L/W
Shift solenoid
valve A
When shift solenoid valve A operates.
(When driving in “D
1
” or “D
4
”.)
Battery volt-
age
When shift solenoid valve A does not operate.
(When driving in “D
2
” or “D
3
”.)
0V
ON BOARD DIAGNOSIS LOGIC
NBAT0060S03
Diagnostic trouble code
Malfunction is detected when ...
Check item (Possible cause)
: SFT SOL A/CIRC
TCM detects an improper voltage drop
when it tires to operate the solenoid
valve.
I
Harness or connectors
(The solenoid circuit is open or shorted.)
I
Shift solenoid valve A
: P0750
SAT014K
SAT020K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NBAT0060S01
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
for “ENGINE” with CONSULT-II.
2)
Start engine.
3)
Drive vehicle in “D” position and allow the transmission to shift
“1”
,
“2” (“GEAR”).
With GST
Follow the procedure “With CONSULT-II”.
DTC P0750 SHIFT SOLENOID VALVE A
Description
AT-168
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