ISUZU TF SERIES 2004 Workshop Manual

CRUISE CONTROL SYSTEM 8B-13
DTC 1–1 Motor System Short Circuit

Step Action Value(s) YES NO
1 1. Turn the starter switch off.
2. Disconnect the actuator connector C-119.
3. Measure resistance between actuator side
connector terminal 1 and 2.
If control plate position is fully opened or fully
closed, resistance can not be measure.
Is there resistance within range specified in the
value(s) column?





More than
4.2






Go to Step 2





Replace the
actuator
2 Measure continuity between harness side connector
C-119 terminal 1 and the ground, terminal 2 and the
ground, and terminals 1 and 2.
Are the results same as specified in the value(s)
column?


No
continuity


Replace the
control unit

Repair or
replace the
harness

8B-14 CRUISE CONTROL SYSTEM
DTC 1–2 Clutch System Open or Short Circuit

Step Action Value(s) YES NO
1
1. Turn the starter switch off.
2. Disconnect the actuator connector C–119.
3. Measure resistance between actuator side
connector terminal 3 and 4.
Is there resistance within range specified in the
value(s) column?



34.7 –
42.4




Go to Step 2



Replace the
actuator
2
1. Disconnect the brake switch connector C–44.
2. Check continuity between switch side connector
terminal 3 and 4.
Is there continuity between terminals?


—


Go to Step 3

Replace the
switch
3
1. Reconnect the brake switch connector C–44.
2. Check continuity between harness side connector
C–120 terminal 6 and connector C–44 terminal 3,
connector C–119 terminal 4 and connector C–120
terminal 8.
Is there continuity between terminals?




—




Go to Step 4



Replace open
circuit
4 Check continuity between harness side connector
C–119 terminal 3 and the ground, connector C–119
terminal 4 and the ground, connector C–120
terminal 6 and the ground.
Are the results same as specified in the value(s)
column?



No
continuity



Replace the
control unit



Repair short
circuit

CRUISE CONTROL SYSTEM 8B-15
DTC 1–3 Mechanical Defect

Step Action Value(s) YES NO
1
1. Turn the starter switch off.
2. Disconnect the actuator connector C–119.
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?




—



Replace the
actuator




Go to Step 2
2 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?


—


Go to Step 3

Replace the
actuator
3 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?


—


Go to Step 4

Replace the
actuator
4 Is there continuity between harness side connector
C–119 terminal 1 and connector C–120 terminal 7,
connector C–119 terminal 2 and connector C–120
terminal 15?


—

Replace the
control unit
Repair or
replace
harness

8B-16 CRUISE CONTROL SYSTEM
DTC 1–4 Close Side of Motor System Open Circuit

Step Action Value(s) YES NO
1
1. Turn the starter switch off.
2. Disconnect the actuator connector C–119.
3. Measure resistance between actuator side
connector terminal 1 and 2.
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?





More than
4.2






Go to Step 2





Replace the
actuator
2 Is there continuity between harness side connector
C–119 terminal 1 and connector C–120 terminal 7,
harness side connector C–119 terminal 2 and
connector C–120 terminal 15?


—

Replace the
control unit
Repair or
replace the
harness

CRUISE CONTROL SYSTEM 8B-17
DTC 2–1 Signal of Vehicle Speed Malfunction
Step Action Value(s) YES NO
1 Check the DTC for engine.
Is the vehicle speed sensor DTC set?
—
Go to DTC for
engine


Go to Step 2

2 Check continuity between harness side connector
E–44 terminal 3 and connector C–120 terminal 9.
Is there continuity between terminals?

—

Go to Step 3
Replace open
circuit
3 Check the continuity between harness side
connector E–44 terminal 3 and ground, connector
C–120 terminal 9 and ground.
Are the results same as specified in the value(s)
column?



No continuity



Replace the
control unit


Repair short
circuit

8B-18 CRUISE CONTROL SYSTEM
DTC 3–1 Turning On Switch at All time or at the same time
Step Action Value(s) YES NO
1
1. Turn the starter switch off.
2. Disconnect the auto cruise control unit connector
C-120.
3. Turn the starter switch on.
4. Turn the cruise control switch “cancel”.
5. Check voltage at the harness side connector C–
120 terminal 10, terminal 3 and terminal 4.
Is the voltage specified value?






0V






Go to Step 3






Go to Step 2
2
1. Turn the starter switch off.
2. Disconnect the cruise control switch connector B–
59.
3. Check voltage at the harness side connector C–
120 terminal 10, terminal 3 and terminal 4.
Is the voltage specified value?




0V


Replace the
cruise control
switch



Repair short
circuit
3
1. Turn the starter switch off.
2. Turn the cruise control switch “cancel”.
3. Check the continuity between harness side
connector C–120 terminal 10 and terminal 3,
connector C–120 terminal 3 and terminal 4,
connector C–120 terminal 10 and terminal 4.
Are the results same as specified in the value(s)
column?






No continuity







Go to Step 5






Go to Step 4
4
1. Disconnect the cruise control switch connector B–
59.
2. Check the continuity between harness side
connector C–120 terminal 10 and terminal 3,
connector C–120 terminal 3 and terminal 4,
connector C–120 terminal 10 and terminal 4.
Are the results same as specified in the value(s)
column?






No continuity




Replace the
cruise control
switch





Repair short
circuit
5 Check the continuity between harness side
connector C–120 terminal 10 and connector B–59
terminal 10.
Is there continuity between terminals?


—

Replace the
control unit

Replace open
circuit

No. TFCEL-WE-0431

WORKSHOP MANUAL

TF SERIES




ENGINE
4JA1/4JH1-TC





SECTION 6