display ISUZU KB P190 2007 Workshop Repair Manual

5A-26 BRAKE CONTROL SYSTEM
Tech 2 Scan Tool
Operating Procedure
The power up screen is displayed when you power
up the tester with the systems PCMCIA card. Follow
the operating procedure below.


060R100102




BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

5A-32 BRAKE CONTROL SYSTEM
Data List (Tech 2)
The data displayed by DATA LIST are as follows:
Strings Units Description
FL W heel Speed (Front Left) Km/h (MPH)
FR W heel Speed (Front Right) Km/h (MPH)
RL W heel Speed (Rear Left) Km/h (MPH)
RR W heel Speed (Rear Right) Km/h (MPH) Start the vehicle and make sure of linear
change in each wheel speed.
Brake Switch On/Off Brake switch is “On” when brake pedal is stepped
on.
4 W heel Drive Status 2 W heel Drive/
4 W heel Drive
ABS W arning lamp
On/Off To be “Off” usually
EBD W arning Lamp On/Off To be “Off” usually
ABS State On/Off To be “Off” usually
Valve Relay Command Active/Inactive To be “Active” usually
Return Pump Relay Command Active/Inactive To be “Inactive” usually
EBD State
DTC Status No DTC/
DTCs Set To be “No DTC” usually
FL Release Solenoid Commanded
(Front Left) Active/Inactive
FL Hold Solenoid Commanded (Front
Left) Active/Inactive
FR Release Solenoid Commanded
(Front Right) Active/Inactive
FR Hold Solenoid Commanded (Front
Right) Active/Inactive
Rear Release Solenoid Valve
Commanded Active/Inactive
Rear Hold Solenoid Valve Commanded Active/Inactive
FL Release Solenoid Feedback (Front
Left) Active/Inactive
FL Hold Solenoid Feedback (Front Left) Active/Inactive
FR Release Solenoid Feedback (Front
Left) Active/Inactive
FR Hold Solenoid Feedback (Front Left) Active/Inactive
Rear Release Solenoid Feedback Active/Inactive
Rear Hold Solenoid Valve Feedback Active/Inactive Each valve is “Active” when each valve is operated.
Deceleration Sensor
V 2.0~3.0V when vehicle speed is 0km/h (flat place)
Battery Voltage V The voltage value currently supplied to EHCU


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-35
Diagnosis By “ABS” Warning Lamp
Illumination Pattern
In the event that there is abnormality in the “ABS”
W arning Lamp Illumination Pattern while the key is in
the “ON” position or if the warning lamp is actuated
during driving, the fault should be diagnosed on an
illumination pattern basis as follows:

No. Condition “ABS” Warning Lamp Illumination Pattern Diagnostic
1 W arning Lamp is
actuated normally
Normal
2 W arning Lamp is not
lit
W arning Lamp lighting circuit
trouble. Go to No ABS
W arning Lamp.
3 W arning Lamp remains ON
Diagnostic trouble codes are
stored.
Display diagnostic trouble
codes and diagnose on a
code basis according to the
flow charts.
If diagnostic trouble codes are
not stored, it means warning
lamp lighting circuit or meter
trouble. Go to ABS warning
Lamp On Steady.
4 W arning Lamp is actuated while driving
Diagnostic trouble codes are
stored.
Display diagnostic trouble
codes and diagnose on a
code basis according to the
flow charts.
Diagnostic Trouble Codes (DTCs)
W hen the warning lamp in the meter remains ON, the
EHCU stores the fault identification and disables the
ABS.



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

5A-36 BRAKE CONTROL SYSTEM
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 conditions are satisfied, the
DTC display cannot be started.)
• W ith 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 pedal depressed).

B05RW 0005

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-37
4. Notes
• If the following should occur during Diagnostic Trouble Code (DTC) display, the display will be
discontinued. After initial check, the status that
is under the control of ABS will be returned :
– The vehicle starts (The wheels turn) or the
brake pedal is depressed.
• Up to 3 different codes can be stored.
• If the ABS should turn OFF due to an
intermittent defect, the system will be restored
at the next key cycle, if the initial check finds no
abnormality (when IGN is switched from OFF to
ON).
5. An example of DTC display
Display of DTC 23

B05R100001
After displaying DTC 12 three times, one DTC after
another is displayed. DTC is displayed in numeric
order.
C05L300017
The DTC 12 is displayed repeatedly.




BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

5A-38 BRAKE CONTROL SYSTEM
Basic Diagnostic Flow Chart



RTW 75ALF000201
Step Action Value(s) Yes No
1 1. Ignition “ON”, engine “OFF”.
2. Observe the ABS warning lamp. Note: If the starter switch is turned ON, the ABS
warning lamp will turn on and then turn off after 3
seconds.
Is the ABS warning lamp “ON”? - Go to Step 2 Go to “No
ABS warning lamp”
2 1. Ignition “OFF”.
2. Install Tech 2.
3. Ignition “ON”.
4. Attempt to display ABS data with the Tech 2. Does the Tech 2 display ABS data? - Go to Step 5 Go to Step 3

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-39
Step Action Value(s) Yes No
3 1. Ignition “OFF”, disconnect the EHCU.
2. Check the DLC (Data Link Connector) circuit for an open, short to ground, or short to voltage.
Also, check the DLC ignition feed circuit for an open
or short to ground and the DLC ground circuit for an
open.
3. If a problem is found, repair as necessary. W as a problem found? - Go to Step 2 Go to Step 4
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. W as 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 The DTC is then 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 clear? - 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; 2W D Model or 4W D Model)
Is the action complete? - Verify repair -



BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-49
Step Action
Value(s) Yes No
4 1. Replace front right wheel speed 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
Tech 2.
Are any DTCs stored? - Go to Step 5 Verify repair
5 Replace EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2W D model or 4W D model)
Is the action complete? - Verify repair -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-51
Step Action Value(s) Yes No
7 Check the front right wheel speed sensor. Refer to
"W heel Speed Sensor Inspection procedure"
W as a problem found? - Go to Step 10 Go to Step 8
8 Does the sensor rotor have missing tooth or saw- toothed? - Go to Step 14 Go to Step 9
9 1. Clear the DTC.
2. Test run the vehicle, and check the DTC. Is the DTC displayed repeatedly? - Go to Step 18 Go to Step 17
10 Is the wheel speed sensor damaged or saw-toothed?
- Go to Step 15 Go to Step 16
11 Adjust the preload of the wheel bearing.
Is the action complete? - Verify repair -
12 Repair or replace the front right speed sensor or the
sensor rotor.
Is the action complete? - Verify repair -
13 Repair the front right speed sensor or the sensor rotor.
Is the action complete? - Verify repair -
14 Replace the sensor rotor. Is the action complete? - Verify repair -
15 Replace the front right wheel speed sensor.
Is the action complete? - Verify repair -
16 Repair or replace the front right speed sensor
circuits.
Is the action complete? - Verify repair -
17 Check the connection btween the EHCU and the front right wheel speed sensor and repair as
necessary Refer to "Note on Intermittents".
Is the action complete? - Verify repair -
18 Replace EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2W D model or 4W D model)
Is the action complete? - Verify repair -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

BRAKE CONTROL SYSTEM 5A-53
Step Action
Value(s) Yes No
4 1. Replace front left wheel speed 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
Tech 2.
Are any DTCs stored? - Go to Step 5 Verify repair
5 Replace EHCU.
Note: Check the EHCU type for specification, when
the EHCU is replaced.
(Specification ; 2W D model or 4W D model)
Is the action complete? - Verify repair -


BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007