Isuzu Trooper (1998-2002 year). Manual - part 141

4B2–51

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

5

24

(P1733)

Rear speed sensor signal open or

GND short, speed sensor COM

open.

0.3V > sensor voltage

NOTE: The following procedure shows the case that the
front or rear sensor reference or common grounding line
is broken.

D04RY00059

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–52

Step

Action

Yes

No

1

1. Start the engine.
2. Select TOD mode.

Is there the memory except DTC 24(P1733)?

Go to 

Step 4

Go to 

Step 2

2

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 7

Go to 

Step 3

3

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 7

Repair the circuit.

Go to 

Step 7

4

Is the memory DTC 14(P1731)?

Go to 

Step 5

Refer to 

other

trouble cheek

flow.

5

Is there the continuity between harnesses of terminal 24 and 23
(vehicle side terminal of the front and rear speed sensor)?

Go to 

Step 6

Repair the circuit

Go to 

Step 7

6

Is there the continuity between harnesses of terminal 18 and 15
(vehicle side terminal of the speed sensor COM(–) and ref)?

Replace front and

rear speed

sensor.

Go to 

Step 7

Repair the circuit.

Go to 

Step 7

7

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

Is the step complete?

Verify the repair

Return to 

Step 7

4B2–53

DRIVE LINE CONTROL SYSTEM (TOD)

Check flow

Trouble code

Phenomenon

Standard

6

13

(P1735)

The reference is short-circuited to

GND.

Reference 

]

 5 V

15

(P1736)

The reference is short-circuited to

Vb.

If the reference wire (15) is short-circuited to GND, the
speed signal is not generated. If the wire is short-circuited
to the battery voltage, the signal level becomes faulty.

D04RY00059

DRIVE LINE CONTROL SYSTEM (TOD)

4B2–54

Step

Action

Yes

No

1

1. Start the engine.

Does the voltage between terminals 15 and 19 meet the standard
5V?

The trouble is not

reproduced.

Refer to “Trouble

intermittently

boserved”.

Or verify repair.

Go to Step 2

2

Is the voltage below the standard?

Go to Step 3

Go to Step 7

3

1. Turn off the starter switch.
2. Disconnect the ECU connector.

Is the continuity established between vehicle harness terminals
(B–67)7 and (B–67)11?

Go to Step 4

The ECU is

failed. Replace

the ECU.

Go to Step 8

4

1. Disconnect the H-49 connector.

Is the continuity established between floor harness connector
terminals (H-49)3 and (H-49)9?

Go to Step 5

Short to GND

between (B–67)7

and (H–49)3.

Repair the circuit.

Go to Step 8

5

1. Disconnect the A–3 connector.

Is the continuity established between transfer harness connector
terminals (A–3)2 and (A–3)7?

Replace the front

speed sensor.

Go to Step 8

The reference

harness for the

front speed

sensor is

short–circuited to

GND. Repair the

circuit.

Go to Step 6

6

1. Disconnect the A–3 connector.

Is the continuity established between transfer harness connector
terminals (A–3)1 and (A–3)7?

Replace the rear

speed sensor.

Go to Step 8

The reference

harness for the

rear speed

sensor is

short–circuited to

GND. Repair the

circuit.

Go to Step 8

7

1. Turn off the starter switch.
2. Disconnect the ECU connector.
3. Turn on the starter switch.

Is the battery voltage observed between harness connector
terminals (B–67)7 and (B–67)11?

Repair the

harness circuit.

Go to Step 8

The ECU has

failed. Replace

the ECU.

Go to Step 8

8

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

Is this step complete?

Repeat the

“Diagnosis Flow”

Go to Step 8