2005 INFINITI QX4 Factory Service Manual

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Page 209 of 3419

INFINITI QX4 2005 Factory Service Manual AT-138
DTC P1731 A/T 1ST ENGINE BRAKING
Revision: October 20052005 QX56
DTC P1731 A/T 1ST ENGINE BRAKINGPFP:00000
DescriptionECS00CHB
Fail-safe function to prevent sudden decrease in speed by engine b

Page 210 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1731 A/T 1ST ENGINE BRAKING
AT-139
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B
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Revision: October 20052005 QX56
Diagnostic ProcedureECS00CHG
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start the engine.
2. Select �

Page 211 of 3419

INFINITI QX4 2005 Factory Service Manual AT-140
DTC P1752 INPUT CLUTCH SOLENOID VALVE
Revision: October 20052005 QX56
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CHH
Input clutch solenoid valve is controlled by the TCM in

AT-140
DTC P1752 INPUT CLUTCH SOLENOID VALVE
Revision: October 20052005 QX56
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CHH
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference ValueECS00CHI
On Board Diagnosis LogicECS00CHJ
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1752 I/C SOLENOID/CIRC” with CONSULT-II is detected under the following
conditions.
–When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–When TCM detects as irregular by comparing target value with monitor value.
Possible CauseECS00CHK
Harness or connectors
(The solenoid circuit is open or shorted.)
Input clutch solenoid valve
DTC Confirmation ProcedureECS00CHL
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-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
4th Gear (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5. If DTC is detected go to AT-141, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 1 9
.0.6 - 0.8 A
Input clutch engaged. Refer to AT- 1 9
. 0 - 0.05 A
BCIA0030E

Page 212 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1752 INPUT CLUTCH SOLENOID VALVE
AT-141
D
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MA
B
AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CHM
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ON

Page 213 of 3419

INFINITI QX4 2005 Factory Service Manual AT-142
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONPFP:31940
DescriptionECS00CHN
Input clutch solenoid valve is contro

AT-142
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
Revision: October 20052005 QX56
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONPFP:31940
DescriptionECS00CHN
Input clutch solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehi-
cle speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be
shifted to the optimum position.
This is not only caused by electrical malfunction (circuits open or shorted) but also by mechanical mal-
function such as control valve sticking, improper solenoid valve operation.
CONSULT-II Reference ValueECS00CHO
On Board Diagnosis LogicECS00CHP
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1754 I/C SOLENOID FNCTN” with CONSULT-II is detected under the following
conditions.
–When TCM detects that actual gear ratio is irregular, and relation between gear position and condition of
pressure switch 3 is irregular during depressing accelerator pedal. (Other than during shift change)
–When TCM detects that relation between gear position and condition of ATF pressure switch 3 is irregular
during releasing accelerator pedal. (Other than during shift change)
Possible CauseECS00CHQ
Harness or connectors
(The solenoid and switch circuits are open or shorted.)
Input clutch solenoid valve
ATF pressure switch 3
DTC Confirmation ProcedureECS00CHR
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-II
1. Start engine.
2. Accelerate vehicle to maintain the following conditions.
ACCELE POSI: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
4th Gear (I/C ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
3. Perform step “2” again.
4. Turn ignition switch “OFF”, then perform step “1” to “3” again.
5. Check “SELF-DIAG RESULTS” mode for “A/T” with CONSULT-
II. If DTC (P1754) is detected, refer to AT-143, "
Diagnostic Procedure" .
If DTC (P1752) is detected, go to AT- 1 4 1 , "
Diagnostic Procedure" .
If DTC (P1843) is detected, go to AT- 1 6 3 , "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
I/C SOLENOIDInput clutch disengaged. Refer to AT- 1 9
.0.6 - 0.8 A
Input clutch engaged. Refer to AT- 1 9
. 0 - 0.05 A
ATF PRES SW 3Input clutch engaged. Refer to AT- 1 9
.ON
Input clutch disengaged. Refer to AT- 1 9
.OFF
BCIA0030E

Page 214 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION
AT-143
D
E
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MA
B
AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CHS
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Turn ignition sw

Page 215 of 3419

INFINITI QX4 2005 Factory Service Manual AT-144
DTC P1757 FRONT BRAKE SOLENOID VALVE
Revision: October 20052005 QX56
DTC P1757 FRONT BRAKE SOLENOID VALVEPFP:31940
DescriptionECS00CHT
Front brake solenoid valve is controlled by the TCM in res

AT-144
DTC P1757 FRONT BRAKE SOLENOID VALVE
Revision: October 20052005 QX56
DTC P1757 FRONT BRAKE SOLENOID VALVEPFP:31940
DescriptionECS00CHT
Front brake solenoid valve is controlled by the TCM in response to signals sent from the PNP switch, vehicle
speed sensor and accelerator pedal position sensor (throttle position sensor). Gears will then be shifted to the
optimum position.
CONSULT-II Reference ValueECS00CHU
On Board Diagnosis LogicECS00CHV
This is an OBD-II self-diagnostic item.
Diagnostic trouble code “P1757 FR/B SOLENOID/CIRC” with CONSULT-II is detected under the following
conditions.
–When TCM detects an improper voltage drop when it tries to operate the solenoid valve.
–When TCM detects as irregular by comparing target value with monitor value.
Possible CauseECS00CHW
Harness or connectors
(The solenoid circuit is open or shorted.)
Front brake solenoid valve
DTC Confirmation ProcedureECS00CHX
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-II
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “A/T” with CONSULT-II.
3. Start engine.
4. Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POS: 1.5/8 - 2.0/8
Selector lever: “D” position
Gear position: 3rd
4th Gear (FR/B ON/OFF)
Driving location: Driving the vehicle uphill (increased
engine load) will help maintain the driving conditions
required for this test.
5. If DTC is detected go to AT-145, "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
FR/B SOLENOIDFront brake engaged. Refer to AT- 1 9
.0.6 - 0.8 A
Front brake disengaged. Refer to AT- 1 9
. 0 - 0.05 A
BCIA0030E

Page 216 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1757 FRONT BRAKE SOLENOID VALVE
AT-145
D
E
F
G
H
I
J
K
L
MA
B
AT
Revision: October 20052005 QX56
Diagnostic ProcedureECS00CHY
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ON�

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