2006 INFINITI QX56 Factory Service Manual

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Page 209 of 3383

INFINITI QX56 2006 Factory Service Manual AT-134
DTC P1730 A/T INTERLOCK
Revision: November 20092006 QX56
DTC P1730 A/T INTERLOCKPFP:00000
DescriptionECS00CH5
Fail-safe function to detect interlock conditions.
On Board Diagnosis LogicECS00CH

Page 210 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1730 A/T INTERLOCKAT-135
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Revision: November 2009 2006 QX56
Judgement of A/T InterlockECS00CH9
When A/T Interlock is judged to be malfunctioning, the vehicle should be fi

Page 211 of 3383

INFINITI QX56 2006 Factory Service Manual AT-136
DTC P1730 A/T INTERLOCK
Revision: November 20092006 QX56
4. DETECT MALFUNCTIONING ITEM
Check the following items:
The A/T assembly harness connector pin terminals for damage or loose connectio

Page 212 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1731 A/T 1ST ENGINE BRAKINGAT-137
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Revision: November 2009 2006 QX56
DTC P1731 A/T 1ST ENGINE BRAKINGPFP:00000
DescriptionECS00CHB
Fail-safe function to prevent sudden de

Page 213 of 3383

INFINITI QX56 2006 Factory Service Manual AT-138
DTC P1731 A/T 1ST ENGINE BRAKING
Revision: November 20092006 QX56
Diagnostic ProcedureECS00CHG
1. CHECK INPUT SIGNALS
With CONSULT-II
1. Start the engine.
2. Select “SELECTION FROM MENU”

Page 214 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1752 INPUT CLUTCH SOLENOID VALVEAT-139
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Revision: November 2009 2006 QX56
DTC P1752 INPUT CLUTCH SOLENOID VALVEPFP:31940
DescriptionECS00CHH
Input clutch solenoid valve i

DTC P1752 INPUT CLUTCH SOLENOID VALVEAT-139
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Revision: November 2009 2006 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- 1 4 0 , "
Diagnostic Procedure" .
WITH GST
Follow the procedure “With CONSULT-II”.
Item name Condition Display value (Approx.)
I/C SOLENOID Input clutch disengaged. Refer to
AT- 2 0
.0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 0
.0 - 0.05 A
BCIA0030E

Page 215 of 3383

INFINITI QX56 2006 Factory Service Manual AT-140
DTC P1752 INPUT CLUTCH SOLENOID VALVE
Revision: November 20092006 QX56
Diagnostic ProcedureECS00CHM
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Turn ignition switch “ ON”.
2. Select “MAI

Page 216 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONAT-141
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Revision: November 2009 2006 QX56
DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONPFP:31940
DescriptionECS00CHN
Input clut

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTIONAT-141
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Revision: November 2009 2006 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- 1 4 2 , "
Diagnostic Procedure" .
If DTC (P1752) is detected, go to AT- 1 4 0 , "
Diagnostic Procedure" .
If DTC (P1843) is detected, go to AT- 1 6 2 , "
Diagnostic Procedure" .
Item nameCondition Display value (Approx.)
I/C SOLENOID Input clutch disengaged. Refer to
AT- 2 0
.0.6 - 0.8 A
Input clutch engaged. Refer to AT- 2 0
.0 - 0.05 A
ATF PRES SW 3 Input clutch engaged. Refer to
AT- 2 0
.ON
Input clutch disengaged. Refer to AT- 2 0
.OFF
BCIA0030E

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