Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1871

7A2-100 DIAGNOSIS

Step

Action

Yes

No

6

Inspect the output voltage and throttle opening signal of the throttle
position sensor using a Tech 2 or circuit tester.
Is a voltage value in proportion to the throttle opening output?

TPS

TCM

A16

C56
(28)

C94
(16)

RED/WHT

C56
(49)

(38)

(57)

(69)

ECM

A47 (GND)

A35 (Output)
A26
A55 (+5V)

A69 (Idle SW)

Go to Step 7

Repair the defect or

replace.

7

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 8

Check the power

source harness and

earth harness (bolt

tightening to the

body).

8

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

Go to Step 6

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 7A2-101

No. B3: Engine Race Up During Starting (Slip)

Description:

•

The engine speeds up but vehicle speed does not increase when the accelerator pedal is stepped on at the

starting.

Diagnosis Hints:

•

Possibility of slip of clutch is supposed. If slip of clutch has occurred, a DTC of "Gear ratio error" is stored.

Possible Cause:

•

Slip

of

clutch.

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

•

Dropped line pressure.

•

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

7A2-102 DIAGNOSIS

Step

Action

Yes

No

1

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 2

Go to Step 2

2

Are any DTCs stored?

Go to DTC Chart

Go to Step 3

3

Are the quantity, contamination and smell normal?

If the ATF level is

low, replenish up to

the specified level.

Go to Step 4

If ATF is extremely

black and

contaminated and

smells burnt, slip of

the clutch is

supposed.

Overhaul the AT

unit.

4

Are the engine speed and other engine system correct?

Go to Step 5

Repair the defect or

replace.

5

Inspection of electrical or mechanical fault
Is the signal from each pressure switch changed synchronously?

Control Valve

TCM

B1

B12

B20

RED/YEL

WHT/BLK

2-4 Brake Pressure SW

Terminal

Assembly

YEL

E54

(7)

(12)

(1)

H23

(12)

(10)

C95

(1)

(12)

(20)

RED/YEL

YEL

WHT/BLK

L&R Brake Pressure SW

High Clutch Pressure SW

H22

(8)

Range

TCM terminal

Gear

B20

(High clutch

pressure SW)

B1

(2-4 brake pressure

SW)

B12 (Low & reverse

brake pressure SW)

P

-

More than 10V

More than 10V

More than 10V

R

Reverse

More than 10V

More than 10V

-

N

-

More than 10V

More than 10V

More than 10V

D, 3, 2

1st

More than 10V

More than 10V

More than 10V

2nd

More than 10V

-

More than 10V

3rd

-

More than 10V

More than 10V

4th

-

-

More than 10V

L

1st

More than 10V

More than 10V

-

2nd

More than 10V

-

More than 10V

3rd

-

More than 10V

More than 10V

4th

-

-

More than 10V

Go to Step 6

Repair the defect or

replace.

DIAGNOSIS 7A2-103

Step

Action

Yes

No

6

Inspect the output voltage and throttle opening signal of the
throttle position sensor using a Tech 2 or circuit tester.
Is a voltage value in proportion to the throttle opening output?

TPS

TCM

A16

C56
(28)

C94
(16)

RED/WHT

C56
(49)

(38)

(57)

(69)

ECM

A47 (GND)

A35 (Output)
A26
A55 (+5V)

A69 (Idle SW)

Go to Step 7

Repair the defect or

replace.

7

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 8

Check the power

source harness and

earth harness (bolt

tightening to the

body).

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.