Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1769

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.

7A2-128 DIAGNOSIS

No. E3: Gear is Shifted 2nd to 3rd in 2 Range

No. E4: Gear is Shifted 1st to 2nd in L Range

No. E5: Gear is Shifted 3rd to 4th in 3 Range

Description:

•

Gear is shifted 2nd to 3rd in 2 range

•

Gear is shifted 1st to 2nd in L range

•

Gear is shifted 3rd to 4th in 3 range

Possible Cause:

•

Disordered select cable.

•

Disordered inhibitor switch.

•

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

DIAGNOSIS 7A2-129

No. F1: Low Maximum Speed or Poor Acceleration

Description:

•

Starting acceleration is poor.

•

Acceleration is slow though the accelerator pedal is stepped on during the running.

Diagnosis Hints:

•

In addition to the low engine output, faulty gear shifting of AT or fixing at the 3rd position may be possible.

Therefore, in case of such a trouble that "maximum speed is low, and acceleration is poor", it should be cleared

up whether the trouble is originated from the engine system of AT system by a running test, inspection of stall

revolution, etc.

Possible Cause:

•

Clogged air cleaner, out of injection timing, dropped compression pressure, etc.

•

Fixing at 3rd position (fail-safe activated).

Since the gear is fixed at the 3rd position because of the fail-safe function, a trouble that "Maximum

speed is low, and acceleration is poor" is resulted. In this case, the DTC is memorized.

When TCM stops operation because of faulty TCM ground, the gear is fixed at the 3rd position because

of a mechanical reason. In this case, no DTC is memorized.

•

Disordered inhibitor switch .

•

Incorrect properties of throttle opening signal (serial communication) of throttle position sensor.

Throttle opening signal (serial communication) of the throttle position sensor does not change in

proportion to the throttle opening. In this case, fixing at the high or low gear results in such a trouble

that "Maximum Speed is Low and Acceleration is Poor".

•

Slip of clutch (low clutch, high clutch).

•

If slip of clutch is caused, a DTC (gear ratio error) is stored.

•

Dropped line pressure.

•

Trouble in the torque converter system (faulty operation).

Step

Action

Yes

No

1

Test Drive.
Is the gear smoothly shifted in the order of 1st to 2nd, 2nd to 3rd,
3rd to 4th gear and lock up?

Clogged air

cleaner, out of

injection timing,

dropped

compression

pressure, etc.

Go to Step 2

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

7A2-130 DIAGNOSIS

Step

Action

Yes

No

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.

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/Y EL

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.