Isuzu Trooper (1998-2002 year). Service 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
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