Nissan Quest E52. Manual - part 1223

TM-122

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P1726 THROTTLE CONTROL SIGNAL

P1726 THROTTLE CONTROL SIGNAL

Description

INFOID:0000000009650195

The electric throttle control actuator consists of throttle control motor, accelerator pedal position sensor, throt-
tle position sensor, etc. The actuator sends a signal to the ECM, and ECM sends the signal to TCM via CAN
communication.

DTC Logic

INFOID:0000000009650196

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1.

Start the engine.

2.

Maintain the idling condition for 10 seconds or more.

3.

Check DTC.

Is “P1726” detected?

YES

>> Go to 

TM-122, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650197

1.

CHECK DTC WITH ECM

With CONSULT

1.

Turn ignition switch ON.

2.

Perform “Self Diagnostic Results” in “ENGINE”.

Is any DTC detected?

YES

>> Check DTC detected item. Refer to 

EC-96, "DTC Index"

.

NO

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

DTC

Trouble diagnosis name

DTC detection condition

Possible cause

P1726

Throttle Control Signal Cir-
cuit

TCM receives unusual signal of engine sys-
tem from ECM

Harness or connectors
(Electric throttle sensor signal circuit is open 
or shorted.)

P1740 SELECT SOLENOID

TM-123

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

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P1740 SELECT SOLENOID

DTC Logic

INFOID:0000000009650198

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1.

Start the engine.

2.

Operate selector lever and keep for 1 second or more in each position.

3.

Check DTC.

With GST

Follow the procedure “With CONSULT”.

Is “P1740” detected?

YES

>> Go to 

TM-123, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650199

1.

CHECK LOCK-UP SELECT SOLENOID VALVE

1.

Turn ignition switch OFF.

2.

Disconnect the CVT unit connector.

3.

Check the lock-up select solenoid valve. Refer to 

TM-124, "Component Inspection (Lock-up Select Sole-

noid Valve)"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace the transaxle assembly due to malfunction in the lock-up select solenoid valve. Refer to

TM-174, "Removal and Installation"

.

2.

CHECK HARNESS BETWEEN TCM AND CVT UNIT

1.

Disconnect the TCM connector.

2.

Check the continuity between TCM harness connector terminal and CVT unit harness connector terminal.

3.

Check the continuity between TCM harness connector terminal and ground.

DTC

Trouble diagnosis name

DTC detection condition

Possible cause

P1740

Lock-up Select Solenoid 
Valve Circuit

When lock-up select solenoid valve command 
value of TCM is ON, the OFF status of lock-up 
select solenoid valve monitor value keeps for 
0.2 seconds or more

• Harness or connectors

(Lock-up select solenoid circuit is open 
or shorted.)

• Lock-up select solenoid valve

When lock-up select solenoid valve command 
value of TCM is OFF, the ON status of lock-up 
select solenoid valve monitor value keeps for 
0.2 seconds or more

TCM

CVT unit

Continuity

Connector

Terminal

Connector

Terminal

F23

37

F24

13

Existed

TM-124

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

P1740 SELECT SOLENOID

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> Repair or replace damaged parts.

Component Inspection (Lock-up Select Solenoid Valve)

INFOID:0000000009650200

1.

CHECK LOCK-UP SELECT SOLENOID VALVE

Check the resistance between CVT unit connector terminal and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace the transaxle assembly due to malfunction in the lock-up select solenoid valve. Refer to

TM-174, "Removal and Installation"

.

TCM

—

Continuity

Connector

Terminal

F23

37

Ground

Not existed

CVT unit

—

Condition

Resistance

Terminal

13

Ground

CVT fluid temperature: 20

°

C (68

°

F)

12.3 – 13.5 

Ω

CVT fluid temperature: 50

°

C (122

°

F)

13.7 – 15.1 

Ω

CVT fluid temperature: 80

°

C (176

°

F)

15.1 – 16.7 

Ω

P1777 STEP MOTOR

TM-125

< DTC/CIRCUIT DIAGNOSIS >

[CVT: RE0F09B]

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P1777 STEP MOTOR

DTC Logic

INFOID:0000000009650201

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

CAUTION:

Always drive vehicle at a safe speed.

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

CHECK DTC DETECTION

With CONSULT

1.

Start the engine.

2.

Drive the vehicle.

3.

Maintain the following conditions for 5 seconds or more.

With GST

Follow the procedure “With CONSULT”.

Is “P1777” detected?

YES

>> Go to 

TM-125, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009650202

1.

CHECK STEP MOTOR CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect the TCM connector.

3.

Check the resistance between TCM harness connector terminals.

4.

Check the resistance between TCM harness connector terminals and ground.

DTC

Trouble diagnosis name

DTC detection condition

Possible cause

P1777

Step Motor Circuit

When step motor command value of TCM is 
ON, the OFF status of step motor monitor 
value keeps for 0.2 seconds or more

• Harness or connectors

(Step motor circuit is open or shorted.)

• Step  motor

When step motor command value of TCM is 
OFF, the ON status of step motor monitor 
value keeps for 0.2 seconds or more

Selector lever

: “D” position

Vehicle speed

: 20 km/h (13 MPH) or more

TCM

Resistance (Approx.)

Connector

Terminal

F23

27

28

30.0 

Ω

29

30