Infiniti G20 (P11). Manual — part 65

15. Engine Speed Does Not Return To Idle
(Light Braking D

4

→

D

3

)

=NCAT0095

SYMPTOM:

I

Engine speed does not smoothly return to idle when A/T
shifts from D

4

to D

3

.

I

Vehicle does not decelerate by engine brake when turning
overdrive control switch OFF.

I

Vehicle does not decelerate by engine brake when shifting
A/T from “D” to “2” position.

1

CHECK SELF-DIAGNOSTIC RESULTS

Does self-diagnosis show damage to overrun clutch solenoid valve circuit after cruise test?

SAT348H

Yes or NO

Yes

©

Check overrun clutch solenoid valve circuit. Refer to “DTC P1760”, AT-202.

No

©

GO TO 2.

2

CHECK THROTTLE POSITION SENSOR

Check throttle position sensor. Refer to EC-177, “DTC P0120 THROTTLE POSITION SENSOR”.

SAT413J

OK or NG

OK

©

GO TO 3.

NG

©

Repair or replace throttle position sensor.

GI

MA

EM

LC

EC

FE

CL

MT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

15. Engine Speed Does Not Return To Idle (Light Braking D

4

→

D

3

)

AT-257

3

CHECK A/T FLUID CONDITION

1. Remove oil pan.
2. Check A/T fluid condition.

SAT171B

OK or NG

OK

©

GO TO 4.

NG

©

GO TO 6.

4

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-280.
2. Check the following items:

I

Overrun clutch control valve

I

Overrun clutch reducing valve

I

Overrun clutch solenoid valve

OK or NG

OK

©

GO TO 5.

NG

©

Repair or replace damaged parts.

5

CHECK SYMPTOM

Check again.

OK or NG

OK

©

INSPECTION END

NG

©

1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-

nector.

6

DETECT MALFUNCTIONING ITEM

1. Remove control valve assembly. Refer to AT-280.
2. Check the following items:

I

Overrun clutch control valve

I

Overrun clutch reducing valve

I

Overrun clutch solenoid valve

3. Disassemble A/T.
4. Check the following items:

I

Overrun clutch assembly

I

Oil pump assembly

OK or NG

OK

©

GO TO 5.

NG

©

Repair or replace damaged parts.

TROUBLE DIAGNOSES FOR SYMPTOMS

15. Engine Speed Does Not Return To Idle (Light Braking D

4

→

D

3

) (Cont’d)

AT-258

16. Vehicle Does Not Start From D

1

NCAT0096

SYMPTOM:
Vehicle does not start from D

1

on Cruise test — Part 2.

1

CHECK SELF-DIAGNOSTIC RESULTS

Does self-diagnosis show damage to vehicle speed sensor·A/T (revolution sensor), shift solenoid valve A, B or vehicle
speed sensor·MTR after cruise test?

SAT934FA

Yes or No

Yes

©

Check damaged circuit. Refer to “DTC P0720, P0750, P0755 or VHCL SPEED
SEN·MTR”, AT-119, 181, or 215.

No

©

GO TO 2.

2

CHECK SYMPTOM

Check again.

OK or NG

OK

©

Go to 8. Vehicle Cannot Be Started From D

1

, AT-240.

NG

©

1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-

nector.

GI

MA

EM

LC

EC

FE

CL

MT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

16. Vehicle Does Not Start From D

1

AT-259

17. A/T Does Not Shift: D

4

→

D

3

, When

Overdrive Control Switch “ON”

→

“OFF”

=NCAT0097

SYMPTOM:
A/T does not shift from D

4

to D

3

when changing overdrive

control switch to “OFF” position.

1

CHECK OVERDRIVE CONTROL SWITCH CIRCUIT

With CONSULT-II

Does “TCM INPUT SIGNALS” in “DATA MONITOR” show damage to overdrive control switch circuit?

Without CONSULT-II

Does self-diagnosis show damage to overdrive control switch circuit?

SAT344H

Yes or No

Yes

©

Check overdrive control switch circuit. Refer to AT-264.

No

©

Go to 10. A/T Does Not Shift: D

2

,

D

3

, AT-246.

TROUBLE DIAGNOSES FOR SYMPTOMS

17. A/T Does Not Shift: D

4

→

D

3

, When Overdrive Control Switch “ON”

→

“OFF”

AT-260