Isuzu Trooper (1998-2002 year). Manual - part 937

8D–282

WIRING SYSTEM

DTC 1–1 Motor System Short Circuit

STEP

ACTION

VALUE(S)

YES

NO

1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Measure resistance between actuator side connector

terminal 1 and 2.

NOTE: If control plate position is fully opened or fully
closed, resistance can not be measured.
Is the resistance within range specified in the value(s)
column?

Measure continuity between harness side connector C–37
terminal 1 and the ground, terminal 2 and the ground, and
terminal 1 and 2.
Are the results same as specified in the value(s) columns?

More than 4.2

Ω

No continuity

Go to
step 2

Replace
the control
unit

Replace
the
actuator

Repair or
replace
the
harness

1

2

WIRING SYSTEM

8D–283

DTC 1–2 Clutch System Open or Short Circuit

STEP

ACTION

VALUE(S)

YES

NO

1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Measure resistance between actuator side connector

terminal 3 and 4.

Is the resistance within range specified in the value(s)
column?

1. Disconnect the brake switch connector B–13.
2. Check continuity between switch side connector terminal 2

and 3.

Is there continuity between terminals?

1. Reconnect the brake switch connector B–13.
2. Check continuity between harness side connector B–9

terminal 6 and connector C–37 terminal 3, connector C–37
terminal 4 and connector B–9 terminal 8.

Is there continuity between terminals?

Is there continuity between harness side connector C–37
terminal 3 and the ground, connector C–37 terminal 4 and
the ground, connector B–9 terminal 6 and the ground?
Are the results same as specified in the value(s) column?

34.7 – 42.4

Ω

–

–

No continuity

Go to
step 2

Go to
step 3

Go to
step 4

Replace
the control
unit

Replace
the
actuator

Adjust  the
switch or
replace it

Repair
open
circuit

Repair
short
circuit

1

2

3

4

8D–284

WIRING SYSTEM

DTC 1–3 Mechanical Defect

STEP

ACTION

VALUE(S)

YES

NO

1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Connect the battery positive terminal with the actuator side

connector terminal 3 and the battery negative terminal with
terminal 4.

Does the control plate move by hand?

Connect the battery positive terminal with the actuator side
connector terminal 1 and 3, and the battery negative terminal
with terminal 2 and 4.
Does the control plate move to full open side?

Connect the battery positive terminal with the actuator side
connector terminal 2 and 3, and the battery negative terminal
with terminal 1 and 4.
Does the control plate move to full close side?

Is there continuity between harness side connector C–37
terminal 1 and connector B–9 terminal 7, connector C–37
terminal 2 and connector B–9 terminal 15?

–

–

–

–

Replace
the
actuator

Go to
step 3

Go to
step 4

Replace
the control
unit

Go to
step 2

Replace
the
actuator

Replace
the
actuator

Repair or
replace
harness

1

2

3

4

WIRING SYSTEM

8D–285

DTC 1–4 Open Side of Motor System Continuously Energizing

STEP

ACTION

VALUE(S)

YES

NO

1. Turn the starter switch off.
2. Disconnect the actuator connector C–37.
3. Measure resistance between actuator side connector

terminal 1 and 2.

NOTE: If control plate position is fully opened or fully
closed, resistance can not be measured.
Is there resistance within range specified in the value(s)
column?

Is there continuity between harness side connector C–37
terminal 1 and connector B–9 terminal 7, harness side
connector C–37 terminal 2 and connector B–9 terminal 15?

More than 4.2

Ω

–

Go to
step 2

Replace
the control
unit

Replace
the
actuator

Repair or
replace
harness

1

2