display ISUZU TF SERIES 2004 Repair Manual
[x] Cancel search | Manufacturer: ISUZU, Model Year: 2004, Model line: TF SERIES, Model: ISUZU TF SERIES 2004Pages: 4264, PDF Size: 72.63 MB
Page 403 of 4264

BRAKE CONTROL SYSTEM 5A-87
Step Action
Value(s) Yes No
5 1. Ignition "OFF".
2. Connect 2-4WD control unit.
3. Disconnect EHCU.
4. Ignition "ON," engine "OFF."
5. Install the high impedance digital multimeter.
6. Check the transfer (2-4WD control unit) signal
value.
Was the value normal? Transfer 2WD
Mode: 8.3Hz
(
15%)
Transfer 4WD
Mode: 4.2Hz
(
15%) Go to Step 7 Go to Step 6
6 Replace 2-4WD control unit.
Was the action complete?
- Go to Step 7 -
7 1. Ignition “ON,” engine “OFF.”
2. Select “Display DTCs” with the Tech 2.
Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech2.
Are any DTCs stored? - Go to Step 8 Verify repair
8 Replace EHCU.
Note : Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2WD model or 4WD model)
Was the action complete? - Verify repair -
Page 405 of 4264

BRAKE CONTROL SYSTEM 5A-89
Step Action Value(s) Yes No
4 1. Ignition "OFF".
2. Check for a poor condition at the EHCU harness
connector.
3. Check the EHCU circuit for an open, short to
ground, or short to voltage. Also, check the EHCU
ignition feed circuit for an open or short to ground
and the EHCU ground circuit for an open or short
to voltage.
4. If a problem is found, repair as necessary.
Was a problem found? - Verify repair Go to Step 9
5 1. Ignition "OFF," disconnect the EHCU and G-
sensor.
2. Check the circuit between EHCU and G-sensor.
(short to ground, or short to voltage.)
3. If a problem is found, repair as necessary.
Was a problem found? - Verify repair
Go to Step 6 Go to Step 6
6 1. Remove the G-sensor.
2. Reconnect G-sensor and EHCU
3. Install the Tech 2.
4. Ignition "ON", engine "OFF".
5. Observe the G-sensor reading on Tech 2.
If G-sensor inclines, reading voltage will change.
Is the reading voltage between specified value? 1.0 – 4.0 V Go to Step 7 Go to Step 8
7 1. Ignition "OFF".
2. Install the G-sensor.
3. Install the Tech 2.
4. Ignition "ON", engine "OFF".
5. Select "Display DTCs" with the Tech 2.
Are any DTCs stored? - Go to Step 8 Verify repair
8 1. Replace G-sensor.
2. Select "Display DTCs" with the Tech 2.
Note: Perform the various tests (actuator test, test
run, brake test, etc.) then observe the DTC with a
Tech2.
Are any DTCs stored? - Go to Step 9 Verify repair
9 Replace EHCU.
Note : Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2WD model or 4WD model)
Was the action complete? - Verify repair -
Page 1052 of 4264

8A-394 ELECTRICAL-BODY AND CHASSIS
060R100102
Operating Procedure
The power up screen is displayed when you power up
the tester with the Isuzu systems PCMCIA card.
Follow the operating procedure.
Page 1054 of 4264

8A-396 ELECTRICAL-BODY AND CHASSIS
RTW38DLH000101
Menu
The left table shows witch functions are used for the
available equipment versions.
NOTE: Marked items are not applied for keyless entry
system.
DTC
On OBD has three options available in the Tech-2
DTC mode to display the enhanced information
available.
Read DTC Info Ordered By Priority.
Read DTC Info As Stored By ECU.
Clear DTC and Alarm Code Info.
Clear DTC Information
To clear Diagnostic Trouble Codes (DTCs), Use the
diagnostic scan tool “Clear DTC Information” function.
Tech-2 Data Display
The Tech-2 data values represent values that would
be seen on a normally-keyless entry system.
RTW38DSH001601
Actuator Test
Unlock/Lock Test
Check whether opening and closing of a door lock
can be performed by operation of Tech-2.
1. Turn the key “OFF”.
2. Turn the key “ON”.
3. Check the display and test menu.
4. Operate the Tech-2.
Page 1055 of 4264

ELECTRICAL-BODY AND CHASSIS 8A-397
RTW38DSH001701
Turn Signal Test
Check the turn signal lamp lights up by operation of
Tech-2.
1. Turn the key “OFF”.
2. Turn the key “ON”.
3. Check the display and test menu.
4. Operate the Tech-2.
060R200289
Programming
Erase Remove Key
To erase remove control key code in the control unit.
1. Check the display of Tech-2 and press “Confirm”
key.
RTW38DSH001001
2. Enter security code.
3. Press “Not Okay” or “Okay” key.
Page 1056 of 4264

8A-398 ELECTRICAL-BODY AND CHASSIS
RTW38DSH001101
4. Check the display of Tech-2 and press “Confirm”
key.
RTW38DSH001201
5. Check the display of Tech-2 and press “Confirm”
key.
060R200289
Program Remote Key
To program remote control key code in the control
unit.
1. Check the display of Tech-2 and press “Confirm”
key.
Page 1057 of 4264

ELECTRICAL-BODY AND CHASSIS 8A-399
RTW38DSH001301
2. Check the following table in the display of Tech-2.
3. Operate the remote key.
RTW38DSH001401
4. Check the display of Tech-2 and press “Confirm”
key.
RTW38DSH001501
5. Check the display of Tech-2 and press “No”or
“Yes” key.
Page 1100 of 4264

8B-2 CRUISE CONTROL SYSTEM
Diagnosis ..........................................................................................................................................8B- 10
DTC Display Condition ............................................................................................................8B- 10
DTC Display Format .................................................................................................................8B- 11
Circuit Diagram ..........................................................................................................................8B- 11
DTC 1-1 Motor System Short Circuit ....................................................................................8B- 13
DTC 1-2 Clutch Open or Short Circuit .................................................................................8B- 14
DTC 1-3 Mechanical Defect ....................................................................................................8B- 15
DTC 1-4 Close Side of Motor System ..................................................................................8B- 16
DTC 2-1 Signal of Vehicle Speed Malfunction ..................................................................8B- 17
DTC 3-1 Turning On Switch at All time or at the same time ..........................................8B- 18
Page 1108 of 4264

8B-10 CRUISE CONTROL SYSTEM
Diagnosis
The cruise control unit uses the cruise main indicator light and diagnosis the failure, when the control unit detects
abnormality on the table below.
PART POSSIBLE CAUSE DETECTION PERIOD DTC
Actuator Motor system short circuit Energizing motor 1-1
Clutch system short circuit Energizing clutch 1-2
Clutch system open circuit Energizing clutch 1-2
Mechanical defect Cruise controlling 1-3
Close side of motor system open circuit Cruise controlling 1-1
Cruise control unit Close side of motor system open circuit While starter sw on 1-4
Clutch output abnormality While starter sw on 1-4
Vehicle speed sensor Signal of vehicle speed disconnection Cruise controlling 2-1
Signal of vehicle speed abnormality Cruise controlling 2-1
Switch Turning on switch at all times While starter sw on 3-1
Turning on switch at the same time While starter sw on 3-1
DTC : Diagnostic Trouble Code
DTC Display Condition
1. With the vehicle stationary and the ignition ON, activate the ‘Cruise Cancel’ switch three times within 2 seconds.
2. If there are no DTC’s stored in the Cruise control unit, the LED on the Cruise Main switch will blink rapidly (2Hz).
3. Any DTC’s stored in the Cruise control unit will be displayed by the CRUISE SET warning lamp in the meter
cluster.
4. Read the set DTC’s by referring to then charts on this page.
NOTE:
The DTC display mode will be aborted if either the vehicle speed rises above 10km/h or the RESUME switch is
operated.
The control module stores the DTC in a ‘volatile’ memory – that is the memory is only active while the ignition is
ON.
Turning the ignition to the OFF position will clesr any stored DTC’s.
Page 1109 of 4264

CRUISE CONTROL SYSTEM 8B-11
DTC Display Format
1. When no DTCs are detected. (The unit : sec.)
F08RW003
2. When two or more DTCs are detected. (The unit : sec.)
F08RW009