Isuzu Trooper (1998-2002 year). Manual - part 140

4B2–47

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

3

16 

(P1737)

The front speed sensor no pulse.

Hi level : 4.5 

∼

 6.0 V

Lo level : 0.7 

∼

 2.0 V

Frequency (F) =

700–850 Hz (at 50 km/h)

NOTE: Find the trouble in which the pulse corresponding
to the running speed is not input.

D04RY00059

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–48

Step

Action

Yes

No

1

1. Connect TECH 2.

While running in TOD mode, does TECH–2’s front speed sensor
indication change with vehicle speed?

Go to 

Step 2

Repair and

inspection front

speed sensor

tone wheel.

Go to 

Step 6

2

1. Clear the trouble code.

While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?

Go to 

Step 3

The trouble is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

3

1. Turn off the starter switch.
2. Disconnect the ECU connector (B–67) and (B–68).

Is there the continuity between the connector (B–68) terminal 12
and connector (B–67) terminal 11?

Repair the circuit.

Go to 

Step 6

Go to 

Step 4

4

1. Disconnect the transfer connector (A–3).

Is there the continuity between the connector (B–68) terminal 12
and the connector (A–3) terminal 6, the connector (B–67) terminal
7 and connector (A–3) terminal 2, and the connector (B–67)
terminal 10 and connector (A–3) terminal 10?

Replace the front

speed sensor.

Go to 

Step 5

Repair the circuit.

Go to 

Step 5

5

1. Clear the trouble code.

While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?

Replace ECU.

Go to 

Step 6

Go to 

Step 6

6

1. Check that all the parts are mounted.
2. Clear the trouble code.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to Step 6

4B2–49

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

4

27

(P1738)

The rear speed sensor no pulse.

Hi level : 4.5 

∼

 6.0 V

Lo level : 0.7 

∼

 2.0 V

Frequency (F) =

700–850 Hz (at 50 km/h)

NOTE: Find the trouble in which the pulse corresponding
to the running speed is not input.

D04RY00059

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–50

Step

Action

Yes

No

1

1. Connect TECH 2.

While running in TOD mode, does TECH–2’s rear speed sensor
indication change with vehicle speed?

Go to 

Step 2

Repair and

inspection front

speed sensor

tone wheel.

Go to 

Step 6

2

1. Clear the trouble code.

While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?

Go to 

Step 3

The trouble is not

reproduced.

Refer to

“Troubles

intermittently

observed”.

3

1. Turn off the starter switch.
2. Disconnect the ECU connector (B–67) and (B–68).

Is there the continuity between the connector (B–68) terminal 11
and connector (B–67) terminal 11?

Repair the circuit.

Go to 

Step 5

Go to 

Step 4

4

1. Disconnect the transfer connector (A–3).

Is there the continuity between the connector (B–68) terminal 11
and the connector (A–3) terminal 5, the connector (B–67) terminal
7 and connector (A–3) terminal 1, and the connector (B–67)
terminal 10 and connector (A–3) terminal 9?

Replace the rear

speed sensor.

Go to 

Step 5

Repair the circuit.

Go to 

Step 5

5

1. Clear the trouble code.

While running at 40 km/h or 25 mph in TOD mode for 30
consecutive sec, is the trouble code reissued?

Replace ECU.

Go to 

Step 6

Go to 

Step 6

6

1. Check that all the parts are mounted.
2. Clear the trouble code.

Is this step complete?

Repeat the

“Diagnosis Flow”.

Return to 

Step 6