Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1877

7A2-124 DIAGNOSIS

Step

Action

Yes

No

6

Check of power supply to and earth of TCM.
Are the power supply and earth proper?

TCM

A1 (+B)

B5

B15

H23

(15)

C95

(5)

(15)

BLK/YEL

BLK

BLK

Battery

C94

(1)

BLK

Go to Step 7

Check the power

source harness and

earth harness (bolt

tightening to the

body).

7

Inspection of speed sensor and turbine sensor
Have the speed sensor and turbine sensor failed at the same
time? (No DTC is stored at the time of trouble)

Repair the defect or

replace.

Go to Step 8

8

Is the stall revolution correct in D, 3, 2 and L range? Refer the
STALL TEST section in this manual.

Go to Step 9

Repair the defect or

replace.

9

Is the line pressure correct? Refer the LINE PRESSURE TEST
section in this manual.

Trouble in the AT

assembly or control

valve.

Repair the defect or

replace.

DIAGNOSIS 7A2-125

No. E2: Only 4th gear (O/D) is Not Selectable

Description:

•

Gear is not shifted up from 3rd to 4th though the vehicle is accelerated.

Possible Cause:

•

Disordered select cable.

•

Disordered inhibitor switch.

•

ATF thermo sensor detects low oil temperature (4th gear is prohibited temperature less than 10

°

C.).

•

Clogged oil passage of low clutch duty solenoid.

•

Trouble in control valve body (faulty operation, sticking, clogged oil passage).

Step

Action

Yes

No

1

Dislocation or disordered of select lever.
Does the vehicle move when the brake is released in a position
other than the P range and the vehicle is pushed?

Go to Step 2

Adjust the select

cable.

2

Gear ratio trouble diagnosis.
Travel in the following sequence for about 7 seconds or more in
each range: Start in the L range (1st) to 2 range (2nd) to 3 range
(3rd) to D range (4th) (to detect the gear ratio trouble exactly, this
process should be carried out)

Go to Step 3

Go to Step 3

3

Are any DTCs stored?

Go to DTC Chart

Go to Step 4

4

Are the quantity, contamination and smell normal?

If the ATF level is

low, replenish up to

the specified level.

Go to Step 5

If ATF is extremely

black and

contaminated and

smells burnt, slip of

the clutch is

supposed.

Overhaul the AT

unit.

7A2-126 DIAGNOSIS

Step

Action

Yes

No

5

Inspection of inhibitor switch using a Tech 2 or circuit tester.
When the select lever is operated, is the data display in the Tech
2 correct or voltage at each range correct?

Inhibitor SW

TCM

A2 (P)

A17 (3)

B2 (2)

B10 (N)

B11 (D)

B19 (R)

B21 (L)

C95

(2)

(10)

(11)

(19)

(21)

YEL/VIO

RED/BLK

BLU

BLK/GRN

Starter Relay

C94

(2)

(3)

B

H22

(1)

(6)

(4)

(7)

(5)

(2)

P

2

R

N

D

3

L

Start SW

PNK/BLU

E51

(2)

(4)

(8)

(5)

(1)

(9)

(6)

(3)

(10)

(7)

(38)

(15)

(3)

(37)

H4

PNK/BLK

RED/YEL

YEL/VIO

BLK/GRN

PNK/BLK

RED/BLK

BLU

RED/YEL

PNK/BLU

BLK/WHT

BLK

BLK

BLK/WHT

Key Switch

WHT

WHT

Immobiliser Control Unit

TCM terminal

Range

A2

B19

B10

B11

B17

B2

B21

P

Battery

voltage

-

-

-

-

-

-

R

-

Battery
voltage

-

-

-

-

-

N

-

-

Battery
voltage

-

-

-

-

D

-

-

-

Battery
voltage

-

-

-

3

-

-

-

-

Battery
voltage

-

-

2

-

-

-

-

-

Battery
voltage

-

L

-

-

-

-

-

-

Battery

voltage

Go to Step 6

Adjust the inhibitor

switch.

6

Inspection of ATF oil thermo sensor.
Is the ATF oil temperature sensor terminal voltage correct?
After running using the Tech 2 data display function, is the ATF
temperature higher than 10

°

C?

ATF

Temp.

Sensor

TCM

B4 (+)

B14 (-)

H23

(8)

(3)

C95

(4)

(14)

BLU

Terminal

Assembly

BLU/BLK

E54

(2)

(8)

BLU

BLU/BLK

T C M te r m in a l

Te m p e r a tu r e

B 4

( O u tp u t v o lta g e )

2 0

1 . 5 5

4 0

1 . 0 8

6 0

0 .7

Go to Step 7

Repair the defect or

replace.

7

Is the stall revolution correct in D, 3, 2 and L range? Refer the
STALL TEST section in this manual.

Go to Step 8

Repair the defect or

replace.

DIAGNOSIS 7A2-127

Step

Action

Yes

No

8

Is the line pressure correct? Refer the LINE PRESSURE TEST
section in this manual.

Trouble in the AT

assembly or control

valve.

Repair the defect or

replace.