brake sensor ISUZU TROOPER 1995 Repair Manual

CHART A-5, TA-5 I):Eet<(] I TECH 1 I
5) BRAKING SOUND (FROM HYDRAULIC UNIT) IS HEARD WHILE NOT BRAKING
IS THIS THE FIRST VEHICLE START AFTER ENGINE
START? AND IS VEHICLE SPEED UNDER 10 KM/H
(6MPH)?
WHEN
DID IT OCCUR? 1. AT THE TIME OF SHIFT DOWN OR CLUTCH OPERATION 2. AT THE TIME OF LOW J.l DRIVE (ICE OR SNOW ROAD) OR ROUGH ROAD DRIVE 3. AT THE TIME OF HIGH-SPEED TURN 4. AT THE TIME OF PASSING CURB 5. AT THE TIME OF OPERATING ELECTRICAL
EQUIPMENT SWITCHES
6. AT THE TIME OF RACING THE ENGINE (OVER
5000 RPM)
IS THERE PLAY IN EACH SENSOR/WHEEL
SPEED SENSOR RINGS?
•
CHECK HARNESS/CONNECTOR FOR SUSPECTED
DISCONNECTION
• IF NO DISCONNECTION IS FOUND,
REPLACE EBCM
IT IS SELF-CHECKING SOUND NORMAL
UNDER ANY ONE CONDITION ABOVE, ABS MAY SOMETIME BE ACTUATED EVEN WHEN BRAKE
PEDAL IS NOT APPLIED
11 = Friction Unit

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-49
2. Diagnostic trouble codes:
Choose and trace an appropriate flowchart by the numbers listed below to find fault and repair.
Code
Item Diagnosis Chart
No.
12 Start code Normal -
14 EBCM function Abnormality in input/output, operational and B-3
control circuits
15 Power voltage drop B-4
21 G-sensor Wiring disconnection B-5
22 Brake light switch Wiring disconnection B-6
23 Transmission input Input abnormality B-7
32 Motor & motor relay
Shorted or disconnected coil B-8
41 FL wheel valve
Shorted or disconnected coil/wiring
42 FR wheel valve
Shorted or disconnected coil/wiring B-9
44 Rear wheel valve Shorted or disconnected coil/wiring
45 Valve relay Shorted or disconnected coil/wiring B-10
51 FL wheel speed sensor Disconnected coil/wiring
52 FR wheel speed sensor Disconnected coil/wiring B-11
53 RL wheel speed sensor Disconnected coil/wiring
54
RR wheel speed sensor Disconnected coil/wiring
61 FL wheel speed sensor Shorted coil/wiring
62 FR wheel speed sensor Shorted coil/wiring B-12
63 RL wheel speed sensor Shorted coil/wiring
64 RR wheel speed sensor Shorted coil/wiring
65 Sensor signal input Wrong number of teeth B-13

5A4-54 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-5
G-SENSOR CIRCUIT (DIAGNOSTIC TROUBLE CODE 21)
. WITH THE VEHICLE ON A LEVEL SURFACE, TURN
THE KEY OFF • CONNECT THE PINOUT BOX MEASURE RESISTANCE BETWEEN TERMINALS
1 AND 13
I OVER 100n I o-1oo!l I
I
INSPECTG-SENSOR SINGLY(CHARTC-1) I . CHECK FOR SUSPECTED SHORT CIRCUIT IN
HARNESS AND CONNECTOR . IF NORMAL, REPLACE EBCM
~ $
HARNESS BETWEEN EBCM AND G-SENSOR IS REPLACE G-SENSOR I FAULTY I • REPAIR THE HARNESS
CHECK FOR SHORT CIRCUIT TO GROUND OF THE I HARNESS BETWEEN G-SENSOR AND EBCM (BB17)
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-61
CHART B-11 [tE€f((]
SPEED SENSOR DISCONNECTION (DIAGNOSTIC TROUBLE CODE 51, 52, 53, & 54)
• WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
• MEASURE THE FOLLOWING TERMINAL RESISTANCE
ACCORDING TO THE SPECIFIC DIAGNOSTIC TROUBLE
CODE STORED
CODE
51 (FL SENSOR) BETWEEN PINOUT BOX TERMINALS 4 AND 22 CODE 52 (FR SENSOR) BETWEEN PINOUT BOX TERMINALS 21 AND 23 CODE 53 (RL SENSOR) BETWEEN PINOUT BOX TERMINALS 8 AND 9 CODE 54 (RR SENSOR) BETWEEN PINOUT BOX TERMINALS 24 AND 26
I
l I 0.8K-1.3Kn I OTHER I
l I • CHECK FOR FAULTS IN HARNESS BETWEEN MEASURE EACH SENSOR RESISTANCE AT I SPEED SENSOR AND EBCM THE SENSOR CONNECTOR
• FAULT FOUND: REPAIR, AND PERFORM I SYSTEM SELF-CHECK I I • NO FAULT FOUND: REPLACE EBCM o.BK-1.3Kn I l OTHER j
I I REPAIR HARNESS I REPLACE SENSOR I ABNORMALITY BETWEEN SENSORS AND EBCM

5A4-62 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
CHART B-12 tJEe©]
SPEED SENSOR SHORT CIRCUIT (DIAGNOSTIC TROUBLE CODE 61, 62, 63, & 64) ~
WITH THE KEY TURNED OFF, CONNECT PINOUT BOX
MEASURE THE FOLLOWING TERMINAL RESISTANCE
ACCORDING TO THE SPECIFIC DIAGNOSTIC TROUBLE CODE STORED:
CODE 61 (FL SENSOR) BETWEEN PINOUT BOX TERMINALS 4 AND 22 CODE 62 IFR SENSOR) BETWEEN PINOUT BOX TERMINALS 21 AND 23 CODE 63 IRL SENSOR) BETWEEN PINOUT BOX TERMINALS 8 AND 9 CODE 64 (RR SENSOR) BETWEEN PINOUT BOX TERMINALS 24 AND 26
DAMAGE
AND POWERED IRON STICKING TO SENSOR/SENSOR RING?
CHECK FOR FAULTS IN
HARNESS BETWEEN SPEED SENSOR AND EBCM
FAULT FOUND: REPAIR, AND PERFORM SYSTEM SELF-CHECK NO FAULT FOUND:
REPLACE EBCM
REPAIR HARNESS BETWEEN SENSORS AND EBCM
•

5A4 -64 4-WHEEL ANTILOCK BRAKE SYSTEM (ABS)
UNIT INSPECTION PROCEDURE
This section describes the following inspection procedures referred to during "SYMPTOM DIAGNOSIS" and
"DIAGNOSIS BY 'ABS' WARNING LIGHT ILLUMINATION PATTERN":
without TECH 1 with TECH 1
G-sensor
Unit Inspection Chart C-1 -
Sensor Output Inspection Chart C-2 Chart TC-2
Transfer
SW Inspection Chart C-3 Chart TC-3
Transmission
SW Inspection Chart C-4 Chart TC-4
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-65
CHART C-1
G-SENSOR UNIT INSPECTION PROCEDURE
REMOVE G-SENSOR FROM THE VEHICLE
• DISCONNECT
THE G-SENSOR CONNECTOR 825 • MEASURE RESISTANCE 8ElWEEN G-SENSOR CONNECTOR 825-1 TO 825-2 UNDER THE FOLLOWING CONDITIONS:
CONDITION
G-SENSOR
PLACED HORIZONTAL
G-SENSOR TILTED
TO 30°
OR MORE
VEHICLE ...........
FRONT
~
STANDARD G-SENSOR ON/OFF
1000 OR LESS ON
100kn OR MORE OFF
30°
OR MORE
[)EeH:(I

5A4-66 4-WHEEL ANTILOCK BRAKE SYSTEM (ASS)
CHART C-2
SENSOR
OUTPUT INSPECTION PROCEDURE
• TURN THE KEY OFF AND CONNECT PINOUT BOX
• JACK UP THE VEHICLE WITH ALL FOUR WHEELS OFF THE GROUND . MEASURE THE AC VOLTAGE BERWEEN PINOUT BOX TERMINALS
WHILE TURNING EACH WHEEL AT A SPEED OF 1 RPS:
-FLWHEEL BETWEEN TERMINALS 4 AND 22
I
-FR WHEEL
BETWEEN TERMINALS 21 AND 23
-RL WHEEL BETWEEN TERMINALS 8 AND 9
-RR WHEEL BETWEEN TERMINALS 24 AND 26
I UNDER 200 mV I OVER 200 mV J
0
DISCONNECT THE WHEEL SPEED SENSOR
• MEASURE RESISTANCE BETWEEN THE WHEEL SPEED SENSOR
CONNECTOR:
-FLWHEEL BETWEEN TERMINALS C13-1 AND C13-2 -FR WHEEL
BETWEEN TERMINALS C41-1 AND C41-2 -RLWHEEL BETWEEN TERMINALS F3-1 AND F3-2
- RRWHEEL
BETWEEN
TERMINALS F2-1 AND F2-2
I OUTSIDE 0.8K-1.3Kn I 0.8K-1.3KO j
I • WHEEL SPEED SENSOR IS FAULTY I CONNECTOR IS FAUL TV. OR OPEN OR • REPLACE THE WHEEL SPEED SENSOR SHORT
CIRCUIT OF HARNESS BETWEEN
WHEEL SPEED SENSOR CONNECTOR ANDEBCM
I
INSPECT AND CORRECT THE CONNECTOR I OR HARNESS
•

4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-67
CHARTTC-2
SENSOR OUTPUT INSPECTION PROCEDURE
CHECK THE MINIMUM SPEED OF EACH SENSOR BY MODE F6: WHEEL SENSORS (REFER TOP. 5A4-31)
REPLACE
WITH NEW SENSORS AND RECHECK SENSOR OUTPUT CONDITIONS BY MODE F6: WHEEL SENSORS
CHECK THE
SENSOR HARNESS FOR SUSPECTED
DISCONNECTION (CHECK WHILE SHAKING HARNESS/CONNECTOR)
REPLACE
WITH NEW SENSOR ROTOR AND CHECK ONCE AGAIN THE OUTPUT CONDITIONS OF SENSORS WITH MODE F6: WHEEL SENSORS
I TECH 1 I

G-SENSOR
, .... ,REMOVAL
1. Center console
4-WHEEL ANTILOCK BRAKE SYSTEM (ABS) 5A4-75
Fig. 5A4-17
Removal steps 1. Center console 2. G-sensor wiring connector 3. G·sensor fixing bolt 4. G-sensor
Installation steps To install, follow the removal steps in the reverse order.
, .. .,, INSTALLATION
4. G-sensor
• Refer to "Center Console Removal" in • Care should be taken so that the G-sensor is
not installed in the wrong direction.
Section 10.
2. G-sensor wiring connector
3. G-sensor fixing bolt
4. G-sensor
IL•ItNSPECTION AND REPAIR
Refer to "CHART
C-1" in this Section.
3. G-sensor fixing bolt
• Tighten the fixing bolt to the specified
torque.
I~I ____ T_o_rq~u~e ____ N~·-m~(lb_·_in~)--~ ___ 6_(_53~) __ __
2. G-sensor wiring connector
1. Center console
• Refer to "Center Console Installation" in
Section
10.