ECO mode ISUZU TF SERIES 2004 User Guide

BRAKE CONTROL SYSTEM 5A-33

How to display and erase DTCs:
Note:
 DTCs can be displayed also by TECH 2 use
“Diagnostic Trouble Codes“ mode.
1. How to start DTC display:
 Confirm that the vehicle has come to a
complete stop (with the wheels standing still)
and that the brake pedal is not depressed.
(Unless these two condition are satisfied, DTC
display cannot be started.)
 With IGN OFF, connect #12 terminal with #4
terminal or # 5 terminal (GND) . Then turn IGN
ON.

The DLC is located behind the driver side kick panel

















This illustration is based on RHD model
350L300005

 Keep #12 terminal connected with #4 terminal
or # 5 terminal (GND) during DTC display. (If
#12 terminal is separated from #4 terminal or #
5 terminal (GND) during display, display will
stop.)
2. DTC display:
 DTC is displayed by blinking warning lamp.
 Double-digit display.
 First, normal DTC 12 is displayed three times
and then any other DTCs are displayed three
times. (If no other DTCs have been stored, the
display of DTC 12 will be repeated.)
3. How to erase code:
 Conduct brake switch ON/OFF operation 6 or
more times within 3 seconds of self-diagnosis
startup.
 The code cannot be erased if more than 3
seconds have passed since self-diagnosis
startup, or if self-diagnosis has started with
brake switched on (brake pedaled).
B05RW0005

5A-36 BRAKE CONTROL SYSTEM

Step Action Value(s) Yes No
4 1. 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.
2. If a problem is found, repair as necessary.
Was a problem found?
- Go to Step 2 Go to Step 11
5 Select “Display DTCs” with the Tech 2.
Are any DTCs stored? - Go to Step 6 Go to Step 10
6 Review and record for Tech 2 Failure Records data
and DTCs.
Is the action complete? - Go to Step 7 -
7 Following the DTC is stored.
Is this DTC C0271 stored?
- Go to
applicable
DTC table
after Go to
step 8 Go to Step 8
8 Clear the DTCs by “Clear the Information“ with Tech
2.
Did the DTCs cleared? - Go to Step 9 -
9 Select “Display DTCs” with the Tech 2.
Are any DTCs stored?
- Go to
applicable
DTC table Go to Step 10
10 Review and record for Tech 2 data.
Is the action complete?
- Go to
Symptom
Diagnosis and
Go to Basic
Inspection
Procedure -
11 Replace the EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification; 2WD Model or 4WD Model)
Is the action complete? - Verify repair -

5A-40 BRAKE CONTROL SYSTEM

Uneven Braking Occurs While ABS Works

Step Action
Value(s) Yes No
1 Is there play in each or any sensor?
- Repair.
Go to Step 5 Go to Step 2
2 Damage or powdered iron sticking to each or any
sensor/sensor rotor?
- Repair.
Go to Step 5 Go to Step 3
3 Is the each sensor output normal?
- Go to Step 4 Replace
sensor or
repair
harness.
Go to Step 5
4 Is brake pipe connecting order correct?
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification; 2WD Model or 4WD Model) - Replace
EHCU.
Go to Step 5 Reconnect
brake pipe
correctly.
Go to Step 5
5 Reconnect all components, ensure all components
are properly mounted.
Was this step finished?
- Repeat the
“Basic
diagnostic
flow chart” Go to Step 5

The Wheels Are Locked

Step Action Value(s) Yes No
1 Is ABS working?
- Go to Step 2 Go to Step 4
2 Is vehicle speed under 5 km/h?
- Go to Step 3 Normal.
3 Is the each sensor output normal?
- Go to Step 4 Replace
sensor or
repair
harness.
Go to Step 6
4 Is 2-4WD system function normal?
- Go to Step 5 Replace 2-
4WD controll
unit or repair
harness.
Go to Step 6
5 Is EHCU grounded properly?
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification; 2WD Model or 4WD Model) - Replace
EHCU.
Go to Step 6 Repair.
Go to Step 6
6 Reconnect all components, ensure all components
are properly mounted.
Was this step finished?
- Repeat the
“Basic
diagnostic
flow chart” Go to Step 6

5A-42 BRAKE CONTROL SYSTEM

Braking Sound (From EHCU) Is Heard While Not Braking

Step Action Value(s) Yes No
1 Is this the first vehicle start after engine start?
- It is self
checking
sound
Normal. Go to Step 2
2 Is vehicle speed under 10 km/h?
- It is self
checking
sound
Normal. Go to Step 3
3 Check for the following condition:
 At the time of shift down or clutch operation.
 At the time of low road friction drive (ice or snow
road) or rough road drive.
 At the time of high-speed turn.
 At the time of passing curb.
 At the time of operating electrical equipment
switches.
 At the time of racing the engine.
Did it occur under any one condition above?
- ABS may
sometimes be
actuated even
when brake
pedal is not
applied. Go to Step 4
4 Is there play in each or any sensor/wheel speed
sensor rotor?
- Repair.
Go to Step 7 Go to Step 5
5 Damage or powdered iron sticking to each or any
sensor/wheel speed sensor rotor?
- Repair.
Go to Step 7 Go to Step 6
6 Is each sensor normal?
Note : Check the EHCU type for specification, the
EHCU is replaced.
(Specification; 2WD or 4WD Model)

- Check
harness/
connector for
suspected
disconnection
If no
disconnection
is found,
replace EHCU
Go to Step 7 Repair.
Go to Step 7
7 Reconnect all components, ensure all components
are properly mounted.
Was this step finished?
- Repeat the
“Basic
diagnostic
flow chart” Go to Step 7

BRAKE CONTROL SYSTEM 5A-43

No ABS Warning Lamp

Step Action
Value(s) Yes No
1 Check the meter fuse for the instrument cluster
ignition feed circuit.
Is the fuse OK? - Go to Step 3 Go to Step 2
2 Replace the fuse.
Is the action complete? - Verify repair
Go to Step 3 -
3 1. Ignition “OFF,” disconnect the EHCU.
2. Ignition “ON,”engine “OFF.”
3. Observe the ABS warning lamp.
Is the ABS warning lamp “ON”?
- Go to Step 5 Go to Step 4
4 Repair or replace the meter circuit or meter.
Is the action complete? - Verify repair -
5 1. 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.
2. If a problem is found, repair as necessary.
Was a problem found?
- Verify repair Go to Step 6
6 1. Ignition “OFF,” reconnect the EHCU.
2. Ignition “ON,”engine “OFF.”
3. Observe the ABS warning lamp.
Is the ABS warning lamp “ON”?
- Verify repair Go to Step 7
7 Replace EHCU.
Note : Check the EHCU type for specification, the
EHCU is replaced.
(Specification; 2WD or 4WD Model)
Is the action complete? - Verify repair -

BRAKE CONTROL SYSTEM 5A-83

Step Action
Value(s) Yes No
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 - 4.0V 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 -

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 -

ELECTRICAL-BODY AND CHASSIS 8A-271
Tachometer Off-Vehicle Inspection
Remove the tachometer from the meter assembly and
measure the resistance value and the current consumption
between each terminal.


SELF DIAGNOSTIC FUNCTION
Check that the speedometer, tachometer, fuel gauge, and
temperature gauge operate properly.

821R300033

Entering the self-diagnostic mode
1. Push in and hold the “Change Indicator and Reset” knob.
2. Turn the ignition ON.
3. When the LCD odometer turns ON, release the “Change
Indicator and Reset” knob.
4. Push in and release the “Change Indicator and Reset”knob
three times in quick succession.
The meter cluster is now in “Self-diagnostic” mode.
NOTE: Steps 2-4 must be performed within 7 seconds.
The meter cluster will not enter “Self-diagnostic”mode if any of
the following conditions occur:
1. The “Change Indicator and Reset” knob is not depressed
when the ignition is turned ON.
2. The “Change Indicator and Reset” knob is released within
600ms of turning the ignition ON.
3. The “Change Indicator and Reset” knob is not depressed
and released three times within 7 seconds.

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.

ENGINE MECHANICAL 6A – 1


SECTION 6A
ENGINE MECHANICAL


TABLE OF CONTENTS
PAGE
Main Data and Specifications ....................................................................................... 6A - 4
Torque Specifications ................................................................................................... 6A - 8
Standard Bolts ........................................................................................................... 6A - 8
Special Parts Fixing Nuts and Bolts ........................................................................ 6A - 9
Recommended Liquid Gasket ...................................................................................... 6A - 22
LOCTITE Application Procedure .................................................................................. 6A - 23
Servicing......................................................................................................................... 6A - 24
Model Identification ................................................................................................... 6A - 24
Air Cleaner .................................................................................................................. 6A - 24
Lubricating System .................................................................................................... 6A - 24
Fuel System ................................................................................................................ 6A - 25
Cooling System .......................................................................................................... 6A - 27
Valve Clearance Adjustment ..................................................................................... 6A - 31
Compression Pressure Measurement ...................................................................... 6A - 32
General Description....................................................................................................... 6A- 36
Removal and Installation............................................................................................... 6A- 37
Removal ...................................................................................................................... 6A- 37
Installation .................................................................................................................. 6A- 40
Coolant Replenishment.......................................................................................... 6A- 41
Engine Warm-Up..................................................................................................... 6A- 41
Engine Repair Kit ........................................................................................................... 6A- 42
Engine Overhaul ............................................................................................................ 6A- 43
Removal ...................................................................................................................... 6A- 43
External Parts ......................................................................................................... 6A- 43