Infiniti Q45. Manual - part 57

DTC P1752 INPUT CLUTCH SOLENOID VALVE

AT-141

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DTC P1752 INPUT CLUTCH SOLENOID VALVE

PFP:31940

Description

NCS000XK

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 Value

NCS000XL

On Board Diagnosis Logic

NCS000XM

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1752 I/C SOLENOID/CIRC” with CONSULT-II or 5th judgement flicker without
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 Cause

NCS000XN

●

Harness or connectors
(Solenoid circuit is open or shorted.)

●

Input clutch solenoid valve 

DTC Confirmation Procedure

NCS000XO

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 “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II and check monitor “ACCELE POSI”,
“SLCT LVR POSI” and “GEAR”.

3.

Touch “START”.

4.

Start engine.

5.

Drive vehicle and maintain the following conditions for at least 5
consecutive seconds.
ACCELE POSI: 1.5/8 - 2.0/8
SLCT LVR POSI: “D” position 
GEAR: “3” 

Þ

 “4” (I/C ON/OFF)

Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.

6.

If DTC is detected go to 

AT-142, "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-19

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-19

 .

0 - 0.05 A

BCIA0031E

AT-142

DTC P1752 INPUT CLUTCH SOLENOID VALVE

Diagnostic Procedure

NCS000XP

1. 

CHECK INPUT SIGNAL

 With CONSULT-II

1.

Turn ignition switch ON. (Do not start engine.)

2.

Select “MAIN SIGNALS” in “DATA MONITOR” mode for “A/T”
with CONSULT-II.

3.

Start engine.

4.

Read out the value of “I/C SOLENOID” while driving.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.

OK or NG

OK

>> Replace the control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Tem-

perature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-141, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value
(Approx.)

I/C SOLENOID

Input clutch disengaged. Refer to 

AT-19

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-19

 .

0 - 0.05 A

SCIA4793E

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

AT-143

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AT

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

PFP:31940

Description

NCS000XQ

●

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 Value

NCS000XR

On Board Diagnosis Logic

NCS000XS

●

This is an OBD-II self-diagnostic item.

●

Diagnostic trouble code “P1754 I/C SOLENOID FNCTN” with CONSULT-II or 5th judgement flicker with-
out 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
ATF 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 Cause

NCS000XT

●

Harness or connectors
(Solenoid and switch circuits are open or shorted.)

●

Input clutch solenoid valve 

●

ATF pressure switch 3

DTC Confirmation Procedure

NCS000XU

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
SLCT LVR POSI: “D” position 
GEAR: “3” 

Þ

 “4” (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, go to 

AT-144, "Diagnostic Procedure"

 .

If DTC (P1752) is detected, go to 

AT-142, "Diagnostic Procedure"

 .

If DTC (P1843) is detected, go to 

AT-168, "Diagnostic Procedure"

 .

Item name

Condition 

Display value (Approx.) 

I/C SOLENOID

Input clutch disengaged. Refer to 

AT-19

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-19

 .

0 - 0.05 A

ATF PRES SW 3

Input clutch engaged. Refer to 

AT-19

 

.

ON

Input clutch disengaged. Refer to 

AT-19

 

.

OFF

BCIA0031E

AT-144

DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Diagnostic Procedure

NCS000XV

1. 

CHECK INPUT SIGNALS

 With CONSULT-II

1.

Start engine.

2.

Select “SELECTION FROM MENU” in “DATA MONITOR” mode
for “A/T” with CONSULT-II.

3.

Drive vehicle in “D” position (3rd 

Þ

 4th gear), and confirm the

ON/OFF actuation of “ATF PRES SW 3” and electrical current
value of “I/C SOLENOID”.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 2.

2. 

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

AT-173, "MAIN POWER SUPPLY AND GROUND CIR-

CUIT"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace damaged parts.

3. 

DETECT MALFUNCTIONING ITEM

Check the following.

●

The A/T assembly harness connector pin terminals for damage or loose connection with harness connec-
tor.

OK or NG

OK

>> Replace the control valve with TCM. Refer to 

AT-225, "Control Valve with TCM and A/T Fluid Tem-

perature Sensor 2"

 .

NG

>> Repair or replace damaged parts.

4. 

CHECK DTC

Perform “DTC Confirmation Procedure”. Refer to 

AT-143, "DTC Confirmation Procedure"

 .

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

Item name

Condition 

Display value 
(Approx.)

I/C SOLENOID

Input clutch disengaged. Refer to 

AT-19

 .

0.6 - 0.8 A

Input clutch engaged. Refer to 

AT-19

 .

0 - 0.05 A

ATF PRES SW 3

Input clutch engaged. Refer to 

AT-19

 

.

ON

Input clutch disengaged. Refer to 

AT-19

 

.

OFF

SCIA4795E