Infiniti QX4 (R50). Manual - part 14

SAT631IB

Introduction

NBAT0019

SAT632I

SEF234G

The TCM receives a signal from the vehicle speed sensor, throttle
position sensor or PNP switch and provides shift control or lock-up
control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is
capable of diagnosing malfunctioning parts while the ECM can
store malfunctions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good
operating condition and be free of valve seizure, solenoid valve
malfunction, etc.
It is much more difficult to diagnose a problem that occurs intermit-
tently rather than continuously. Most intermittent problems are
caused by poor electric connections or improper wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only may not find the cause of the problems. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the “Work Flow”. Refer to AT-57.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such problems, espe-
cially intermittent ones. Find out what symptoms are present and
under what conditions they occur. A “Diagnostic Worksheet” like the
example (AT-55) should be used.
Start your diagnosis by looking for “conventional” problems first.
This will help troubleshoot driveability problems on an electronically
controlled engine vehicle.
Also check related Service bulletins.

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction

AT-53

DIAGNOSTIC WORKSHEET

=NBAT0019S01

Information From Customer

NBAT0019S0101

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

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-54

Diagnostic Worksheet

=NBAT0019S0102

Read the Fail-safe Remarks and listen to customer complaints.

AT-8

CHECK A/T FLUID

AT-59

Leakage (Follow specified procedure)

Fluid condition

Fluid level

Perform STALL TEST and LINE PRESSURE TEST.

AT-59, AT-62

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

Pressure test — Suspected parts:

Perform all ROAD TEST and mark required procedures.

AT-63

4-1.

Check before engine is started.

AT-64

SELF-DIAGNOSTIC PROCEDURE - Mark detected items.

DTC P0705 PNP switch, AT-99.

DTC P0710 A/T fluid temperature sensor, AT-105.

DTC P0720 Vehicle speed sensor·A/T (Revolution sensor), AT-111.

DTC P0725 Engine speed signal, AT-116.

DTC P0740 Torque converter clutch solenoid valve, AT-148.

DTC P0745 Line pressure solenoid valve, AT-162.

DTC P0750 Shift solenoid valve A, AT-168.

DTC P0755 Shift solenoid valve B, AT-172.

DTC P1705 Throttle position sensor, AT-176.

DTC P1760 Overrun clutch solenoid valve, AT-185.

DTC BATT/FLUID TEMP SEN (A/T fluid temperature sensor and TCM power source), AT-190.

DTC Vehicle speed sensor·MTR, AT-197.

DTC Turbine revolution sensor, AT-202.

DTC A/T communication line, AT-207.

DTC Control unit (RAM), control unit (ROM), AT-211.

DTC Control unit (EEP ROM), AT-213.

PNP, overdrive control and throttle position switches, AT-257.

Battery

Others

4-2.

Check at idle

AT-66

1. O/D OFF Indicator Lamp Does Not Come On, AT-218.

2. Engine Cannot Be Started In “P” And “N” Position, AT-221.

3. In “P” Position, Vehicle Moves Forward Or Backward When Pushed, AT-222.

4. In “N” Position, Vehicle Moves, AT-223.

5. Large Shock. “N”

“R” Position, AT-225.

6. Vehicle Does Not Creep Backward In “R” Position, AT-227.

7. Vehicle Does Not Creep Forward In “D”, “2” Or “1” Position, AT-230.

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-55

4-3.

Cruise test

AT-67
AT-71

Part-1

8. Vehicle Cannot Be Started From D

, AT-233.

9. A/T Does Not Shift: D

Or Does Not Kickdown: D

, AT-236.

10. A/T Does Not Shift: D

, AT-239.

11. A/T Does Not Shift: D

, AT-242.

12. A/T Does Not Perform Lock-up, AT-245.

13. A/T Does Not Hold Lock-up Condition, AT-247.

14. Lock-up Is Not Released, AT-249.

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

), AT-250.

Part-2

AT-75

16. Vehicle Does Not Start From D

, AT-252.

9. A/T Does Not Shift: D

Or Does Not Kickdown: D

, AT-236.

10. A/T Does Not Shift: D

, AT-239.

11. A/T Does Not Shift: D

, AT-242.

Part-3

AT-77

17. A/T Does Not Shift: D

When Overdrive Control Switch “ON”

“OFF”, AT-253

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

), AT-250.

18. A/T Does Not Shift: D

, When Selector Lever “D”

“2” Position, AT-254.

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

), AT-250.

19. A/T Does Not Shift: 2

, When Selector Lever “2”

“1” Position, AT-255.

20. Vehicle Does Not Decelerate By Engine Brake, AT-256.

SELF-DIAGNOSTIC PROCEDURE — Mark detected items.

DTC P0705 PNP switch, AT-99.

DTC P0710 A/T fluid temperature sensor, AT-105.

DTC P0720 Vehicle speed sensor·A/T (Revolution sensor), AT-111.

DTC P0725 Engine speed signal, AT-116.

DTC P0740 Torque converter clutch solenoid valve, AT-148.

DTC P0745 Line pressure solenoid valve, AT-162.

DTC P0750 Shift solenoid valve A, AT-168.

DTC P0755 Shift solenoid valve B, AT-172.

DTC P1705 Throttle position sensor, AT-176.

DTC P1760 Overrun clutch solenoid valve, AT-185.

DTC BATT/FLUID TEMP SEN (A/T fluid temperature sensor and TCM power source), AT-190.

DTC Vehicle speed sensor·MTR, AT-197.

DTC Turbine revolution sensor, AT-202.

DTC A/T communication line, AT-207.

DTC Control unit (RAM), control unit (ROM), AT-211.

DTC Control unit (EEP ROM), AT-213.

PNP, overdrive control and throttle position switches, AT-257.

Battery

Others

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

AT-38

Perform all ROAD TEST and re-mark required procedures.

AT-63

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

Refer to EC-60, “Emission-related Diagnostic Information”.

EC-60

DTC (P0731, 1103) A/T 1st gear function, AT-120.

DTC (P0732, 1104) A/T 2nd gear function, AT-126.

DTC (P0733, 1105) A/T 3rd gear function, AT-132.

DTC (P0734, 1106) A/T 4th gear function, AT-138.

DTC (P0744, 1107) A/T TCC S/V function (lock-up), AT-153.

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-92
AT-97

Erase DTC from TCM and ECM memories.

AT-35

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction (Cont’d)

AT-56

Content .. 12 13 14 15 ..