Infiniti G20 (P11). Manual - part 15

DIAGNOSTIC WORKSHEET

=NCAT0023S01

Information from Customer

NCAT0023S0101

KEY POINTS
WHAT ..... Vehicle & A/T model
WHEN..... Date, Frequencies
WHERE..... Road conditions
HOW..... Operating conditions, Symptoms

Customer name

MR/MS

Model & Year

VIN

Trans. model

Engine

Mileage

Incident Date

Manuf. Date

In Service Date

Frequency

Continuous

Intermittent (

times a day)

Symptoms

Vehicle does not move.

(

Any position

Particular position)

No up-shift

(

1st

2nd

3rd

O/D)

No down-shift

(

O/D

3rd

2nd

1st)

Lockup malfunction

Shift point too high or too low.

Shift shock or slip

(

Lockup

Any drive position)

Noise or vibration

No kickdown

No pattern select

Others

(

)

O/D OFF indicator lamp

Blinks for about 8 seconds.

Continuously lit

Not lit

Malfunction indicator lamp (MIL)

Continuously lit

Not lit

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-57

Diagnostic Worksheet

=NCAT0023S0102

Read the Fail-safe and listen to customer complaints.

AT-8

CHECK A/T FLUID

AT-62

Leakage (Follow specified procedure)

Fluid condition

Fluid level

Perform STALL TEST and LINE PRESSURE TEST.

AT-62, 66

Stall test — Mark possible damaged components/others.

Torque converter one-way clutch

Reverse clutch

Forward clutch

Overrun clutch

Forward one-way clutch

Low & reverse brake

Low one-way clutch

Engine

Line pressure is low

Clutches and brakes except high clutch

and brake band are OK

Line Pressure test — Suspected parts:

Perform all ROAD TEST and mark required procedures.

AT-67

4-1.

Check before engine is started.

AT-68

SELF-DIAGNOSTIC PROCEDURE — Mark detected items.

PNP switch, AT-107.

A/T fluid temperature sensor, AT-113.

Vehicle speed sensor·A/T (Revolution sensor), AT-119.

Engine speed signal, AT-124.

Torque converter clutch solenoid valve, AT-157.

Line pressure solenoid valve, AT-174.

Shift solenoid valve A, AT-181.

Shift solenoid valve B, AT-187.

Throttle position sensor, AT-193.

Overrun clutch solenoid valve, AT-202.

PNP, overdrive control and throttle position switches, AT-263.

A/T fluid temperature sensor and TCM power source, AT-208.

Vehicle speed sensor·MTR, AT-215.

Control unit (RAM), control unit (ROM), AT-219.

Control unit (EEP ROM), AT-221.

Battery

Others

4-2.

Check at idle

AT-69

1. O/D OFF Indicator Lamp Does Not Come On, AT-225.

2. Engine Cannot Be Started In “P” And “N” Position, AT-228.

3. In “P” Position, Vehicle Moves Forward Or Backward When Pushed, AT-229.

4. In “N” Position, Vehicle Moves, AT-230.

5. Large Shock. “N”

“R” Position, AT-232.

6. Vehicle Does Not Creep Backward In “R” Position, AT-234.

7. Vehicle Does Not Creep Forward In “D”, “2” Or “1” Position, AT-237.

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-58

4-3.

Cruise test

AT-72
AT-76

Part-1

8. Vehicle Cannot Be Started From D

, AT-240.

9. A/T Does Not Shift: D

Or Does Not Kickdown: D

, AT-243.

10. A/T Does Not Shift: D

, AT-246.

11. A/T Does Not Shift: D

, AT-249.

12. A/T Does Not Perform Lock-up, AT-252.

13. A/T Does Not Hold Lock-up Condition, AT-254.

14. Lock-up Is Not Released, AT-256.

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

), AT-257.

Part-2

AT-80

16. Vehicle Does Not Start From D

, AT-259.

9. A/T Does Not Shift: D

Or Does Not Kickdown: D

, AT-243.

10. A/T Does Not Shift: D

, AT-246.

11. A/T Does Not Shift: D

, AT-249.

Part-3

AT-82

17. A/T Does Not Shift: D

When Overdrive Control Switch “ON”

“OFF”, AT-260

15. Engine Speed Does Not Return To Idle (Engine Brake In D

), AT-257.

18. A/T Does Not Shift: D

, When Selector Lever “D”

“2” Position, AT-261.

15. Engine Speed Does Not Return To Idle (Engine Brake In 2

), AT-257.

19. A/T Does Not Shift: 2

, When Selector Lever “2”

“1” Position, AT-262.

20. Vehicle Does Not Decelerate By Engine Brake, AT-263.

SELF-DIAGNOSTIC PROCEDURE — Mark detected items.

PNP switch, AT-107.

A/T fluid temperature sensor, AT-113.

Vehicle speed sensor·A/T (Revolution sensor), AT-119.

Engine speed signal, AT-124.

Torque converter clutch solenoid valve, AT-157.

Line pressure solenoid valve, AT-174.

Shift solenoid valve A, AT-181.

Shift solenoid valve B, AT-187.

Throttle position sensor, AT-193.

Overrun clutch solenoid valve, AT-202.

PNP, overdrive control and throttle position switches, AT-263.

A/T fluid temperature sensor and TCM power source, AT-208.

Vehicle speed sensor·MTR, AT-215.

Control unit (RAM), control unit (ROM), AT-219.

Control unit (EEP ROM), AT-221.

Battery

Others

For self-diagnosis NG items, inspect each component. Repair or replace the damaged parts.

AT-41

Perform all ROAD TEST and re-mark required procedures.

AT-67

Perform DTC CONFIRMATION PROCEDURE for following MIL indicating items and check out NG items.

Refer to EC-68, “Emission-related Diagnostic Information”.

EC section

DTC (P0731) A/T 1st gear function, AT-128.

DTC (P0732) A/T 2nd gear function, AT-135.

DTC (P0733) A/T 3rd gear function, AT-141.

DTC (P0734) A/T 4th gear function, AT-147.

DTC (P0744) A/T TCC S/V function (lock-up), AT-163.

Perform the Diagnostic Procedures for all remaining items marked NG. Repair or replace the damaged

parts.
Refer to the Symptom Chart when you perform the procedures. (The chart also shows some other possible
symptoms and the component inspection orders.)

AT-99
AT-86

Erase DTC from TCM and ECM memories.

AT-38

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-59

Work Flow

NCAT0024

HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR

NCAT0024S01

A good understanding of the malfunction conditions can make troubleshooting faster and more accurate. In
general, each customer feels differently about a problem. It is important to fully understand the symptoms or
conditions for a customer complaint.
Make good use of the two sheets provided, “INFORMATION FROM CUSTOMER” (AT-57) and “DIAGNOS-
TIC WORKSHEET” (AT-58), to perform the best troubleshooting possible.

TROUBLE DIAGNOSIS — INTRODUCTION

Work Flow

AT-60

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