1998 ISUZU TROOPER brake sensor

5B±6ANTI±LOCK BRAKE SYSTEM
Rear Wheel Speed Sensor
Rear Wheel Speed Sensor and Associated Parts
350RW008
Legend
(1) Speed Sensor Connector
(2) Sensor Cable Fixing Bolt(3) Clip (11 pieces)
(4) Speed Sensor
(5) Sensor Fixing Bolt
Removal
1. Remove speed sensor connector.
2. Remove clip.
3. Remove sensor cable fixing bolt.
4. Remove sensor fixing bolt.
5. Remove speed sensor.
350RS035
Inspection and Repair
1. Check the speed sensor pole piece for presence of
foreign materials; remove any dirt, etc.2. Check the pole piece for damage, and replace the
speed sensor if necessary.
3. Check the speed sensor cable for a short or an open,
and replace with a new one if necessary. To check for
cable short or open, bend or stretch the cable while
checking for continuity.
4. Check the sensor ring for damage including tooth
chipping. If damaged replace the axle shaft assembly.
Refer to Front Hub and Disc in Drive Shaft System
section.
Installation
1. Install the speed sensor and take care not to hit the
speed sensor pole piece during installation.
2. Install the sensor fixing bolt and tighten it to the
specified torque.
Torque : 18 N´m (1.8kg´m/13 lb ft)
3. Install the sensor cable fixing bolt and tighten it to the
specified torque.
Torque : 24 N´m (2.4kg´m/18 lb ft)
NOTE: Confirm that the cable is not twisted when
connecting the speed sensor cable.
4. Install clip.
5. Install speed sensor connector.

5C – 38 POWER ASSISTED BRAKE SYSTEM
FLUID RESERVOIR TANK
2
4
13
Removal Steps
1. Electrical connector
2. Retainer
3. Fluid reservoir
4. O-ring
Installation Steps
To install, follow the removal steps in the
reverse order.
REMOVAL
NOTE:
Before removing fluid reservoir, remove brake fluid
from fluid reservoir.
1. Electrical Connector
2. Retainer
3. Fluid Reservoir
•The fluid level sensor is built into the fluid
reservoir. It cannot be removed for servicing.
4. O-ring
INSTALLATION
To install, follow the removal steps in the reverse
order, noting the following points;
4. O-ring
•O-ring must be set onto the fluid reservoir, before
installing fluid reservoir.
Retainer
Fluid reservoir
O-ring

6A±11
ENGINE MECHANICAL
Condition CorrectionPossible cause
Engine overheatingLevel of Engine Coolant too lowReplenish
Fan clutch defectiveReplace
Incorrect fan installedReplace
Thermostat defectiveReplace
Engine Coolant pump defectiveCorrect or replace
Radiator cloggedClean or replace
Radiator filler cap defectiveReplace
Level of oil in engine crankcase too
low or wrong engine oilChange or replenish
Resistance in exhaust system
increasedClean exhaust system or replace
defective parts
Throttle Position Sensor adjustment
incorrectReplace with Throttle Valve ASM
Throttle Position Sensor circuit open
or shortedCorrect or replace
Cylinder head gasket damagedReplace
Engine overcoolingThermostat defectiveReplace (Use a thermostat set to
open at 82
C (180
F))
Engine lacks compressionÐÐÐÐRefer to Hard Start
OthersTire inflation pressure abnormalAdjust to recommended pressures
Brake dragAdjust
Clutch slippingAdjust or replace
Level of oil in engine crankcase too
highCorrect level of engine oil
Exhaust Gas Recirculation Valve
defectiveReplace
Engine Noisy
Abnormal engine noise often consists of various noises
originating in rotating parts, sliding parts and othermoving parts of the engine. It is, therefore, advisable to
locate the source of noise systematically.
Condition
Possible causeCorrection
Noise from crank journals or from
crank bearings
(Faulty crank journals and crankOil clearance increased due to worn
crank journals or crank bearingsReplace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing
yj
bearings usually make dull noise that
becomes more evident when
accelerating)Crankshaft out of roundReplace crank bearings and
crankshaft or regrind crankshaft and
install the undersize bearing
Crank bearing seizedCrank bearing seized. Replace crank
bearings and crankshaft or regrind
crankshaft and install the undersize
bearing
Troubleshooting Procedure
Short out each spark plug in sequence using insulated
spark plug wire removers. Locate cylinder with defectivebearing by listening for abnormal noise that stops when
spark plug is shorted out.

6A±18
ENGINE MECHANICAL
Cylinder Head Cover LH
Removal
1. Disconnect battery ground cable.
2. Drain engine coolant from faucet bottom of radiator.
3. Remove engine cover from the dowels on the
common chamber.
F06RW018
4. Remove air cleaner duct assembly (3) and air cleaner
element (4).
130RW001
Legend
(1) Positive Crankcase Ventilation Hose Connector
(2) Intake Air Temperature Sensor
(3) Air Cleaner Duct Assembly
(4) Air Cleaner Element
(5) Mass Air Flow Sensor
NOTE: Disconnect the mass air flow (MAF) sensor
connector, intake air temperature (IAT) sensor connector,
and positive crankcase ventilation (PCV) hose before
hand the air cleaner duct assembly is removed.5. Disconnect following wiring connectors and bonding
cable:

Manifold Absolute Pressure (MAP) sensor

Vacuum Switching Valve (VSV) for Induction Air
Control Valve (IACV) actuator

Ignition coils for left bank

Fuel injectors for left bank

Idle air control (IAC) valve

Throttle position sensor (TPS)

Bonding cable

Others as necessitated
6. Disconnect following vacuum hoses:

Brake master VAC

Canister

VSV for IACV actuator

Duty solenoid valve

PCV
7. Disconnect radiator upper and lower hoses
8. Remove engine harness from the cylinder head
cover.
9. Remove the upper fan guide.
10. Remove cooling fan and clutch assembly.
11. Remove drive belt by pushing down the auto
tensioner using spanner as illustrated.
F06RW019

6E±17 ENGINE DRIVEABILITY AND EMISSIONS
PCM Pinouts
PCM Pinout Table, 32-Way Red Connector ± Row ªAº
TS23344
PINPIN FunctionWire ColorIGN ONENG RUNRefer To
A15 Volt Reference ªAºRED5.0 V5.0 VAppropriate Sensor
A2Knock SensorYEL0.0 V DC
2mV AC0.0 V DC
18mV AC
(at idle)General Description and
Operation, Knock Sensor
A3Not UsedÐÐÐÐ
A4Battery FeedWHTB+B+Chassis Electrical
A5Idle Air Control (IAC) ªAº
HighBLUB+/0.8 VB+/0.8 VGeneral Description and
Operation, IAC
A6IAC ªAº LowBLU/WHTB+/0.8 VB+/0.8 VGeneral Description and
Operation, IAC
A7IAC ªBº LowBLU/BLKB+/0.8 VB+/0.8 VGeneral Description and
Operation, IAC
A8IAC ªBº HighBLU/REDB+/0.8 VB+/0.8 VGeneral Description and
Operation, IAC
A9Automatic Transmission
Fluid (ATF) LampORN/BLUB+B+Automatic Transmission
(4L30E)
A10Winter LampPNK/GRNB+B+Automatic Transmission
(4L30E)
A11Power LampGRY/WHTB+B+Automatic Transmission
(4L30E)
A12Antilock Brake System
(ABS)GRYB+B+Antilock Brake System
A13Malfunction Indicator
(Check Engine or MIL)
LampBLU0.0 VB+Chassis Electrical
A14ªCheck Transmissionº
Lamp Driver (AT)ORN/BLKB+B+Chassis Electrical
Up Shift Lamp Driver (MT)ORN/BLU

6E±70
ENGINE DRIVEABILITY AND EMISSIONS
SPARK Ð Tech 2 Range ±64
to 64
Ð
Displays the amount of spark advance being commanded
by the PCM on the IC circuit.
START-UP ECT Ð Tech 2 Range ±40
C to 151
C
(±40
F to 304
F) Ð
Indicates the engine coolant temperature at the time that
the vehicle was started. Used by the HO2S diagnostic to
determine if the last start-up was a cold start.
START-UP IAT Ð Tech 2 Range ±40
C to 151
C
(±40
F to 304
F) Ð
Indicates the intake air temperature at the time that the
vehicle was started. Used by the HO2S diagnostic to
determine if the last start-up was a cold start.
TP Ð Tech 2 Range 0%-100% Ð
TP (throttle position) angle is computed by the PCM from
the TP sensor voltage. TP angle should display ª0%º at
idle and ª100%º at wide open throttle.
TP SENSOR Ð Tech 2 Range 0.00-5.00 Volts Ð
The voltage being monitored by the PCM on the TP
sensor signal circuit.
CATALYST PROTECTION MODE Ð Tech 2 Displays
YES or NO Ð
ªYESº displayed indicates that the PCM has detected
conditions appropriate to operate in TWC protection
mode. The PCM will decrease the air/fuel ratio to a value
that depends on mass air flow (higher mass air flow =
lower air/fuel ratio).
UPSHIFT LAMP (MANUAL TRANSMISSION)
VEHICLE SPEED Ð Tech 2 Range 0-255 km/h
(0-155 mph) Ð
The vehicle speed sensor signal is converted into km/h
and mph for display.
WEAK CYLINDER Ð Tech 2 Displays Cylinder
Number Ð
This indicates that the PCM has detected crankshaft
speed variations that indicate 2% or more cylinder firing
events are misfires.
Typical Scan Data Values
Use the Typical Scan Data Values Table only after the
On-Board Diagnostic System Check has been
completed, no DTC(s) were noted, and you have
determined that the on-board diagnostics are functioning
properly. Tech 2 values from a properly-running engine
may be used for comparison with the engine you are
diagnosing. The typical scan data values represent
values that would be seen on a normally-running engine.
NOTE: A Tech 2 that displays faulty data should not be
used, and the problem should be reported to the Tech 2
manufacturer. Use of a faulty Tech 2 can result in
misdiagnosis and unnecessary replacement of parts.
Only the parameters listed below are referred to in this
service manual for use in diagnosis. For further
information on using the Tech 2 to diagnose the PCM and
related sensors, refer to the applicable reference section
listed below. If all values are within the typical range
described below, refer to the
Symptoms section for
diagnosis.
Test Conditions
Engine running, lower radiator hose hot, transmission in
park or neutral, closed loop, accessaries off, brake not
applied and air conditioning off.

6E±5 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Conditions for Clearing the MIL/DTC 6E±159. . . . .
Diagnostic Aids 6E±159. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1562
(Flash DTC 35) System Voltage Too Low
at Cranking 6E±160. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±160. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±160. . . . . . .
Conditions for Clearing the MIL/DTC 6E±160. . . . .
Diagnostic Aids 6E±160. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1587
(Flash DTC 25) Brake SW Malfunction 6E±161. . . .
Circuit Description 6E±161. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±161. . . . . . .
Conditions for Clearing the MIL/DTC 6E±161. . . . .
Diagnostic Aids 6E±161. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1588
(Flash DTC 25) Brake SW Malfunction 6E±163. . . .
Circuit Description 6E±163. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±163. . . . . . .
Conditions for Clearing the MIL/DTC 6E±163. . . . .
Diagnostic Aids 6E±163. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0601
(Flash DTC 55) ECM Checksum Error 6E±165. . . . .
Action Taken When the DTC Sets 6E±165. . . . . . .
Conditions for Clearing the MIL/DTC 6E±165. . . . .
Diagnostic Aids 6E±165. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0650
(Flash DTC 77) Check Engine Lam Circuit
Open/Short 6E±166. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±166. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±166. . . . . . .
Conditions for Clearing the MIL/DTC 6E±166. . . . .
Diagnostic Aids 6E±166. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P0654
(Flash DTC 27) Tachometer Circuit
Open/Short 6E±168. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±168. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±168. . . . . . .
Conditions for Clearing the MIL/DTC 6E±168. . . . .
Diagnostic Aids 6E±168. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1655
(Flash DTC 17) Thermo Relay Circuit
Open/Short 6E±170. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±170. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±170. . . . . . .
Conditions for Clearing the MIL/DTC 6E±170. . . . .
Diagnostic Aids 6E±170. . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Trouble Code (DTC) P1657
(Flash DTC 76) ECM Main Relay Circuit
Open/Short 6E±172. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±172. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±172. . . . . . .
Conditions for Clearing the MIL/DTC 6E±172. . . . .
Diagnostic Aids 6E±172. . . . . . . . . . . . . . . . . . . . . . . . Diagnostic Trouble Code (DTC) P1589
(Flash DTC 47) Transmission SW Circuit
Open/Short 6E±174. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Description 6E±174. . . . . . . . . . . . . . . . . . . . .
Action Taken When the DTC Sets 6E±174. . . . . . .
Conditions for Clearing the MIL/DTC 6E±174. . . . .
Diagnostic Aids 6E±174. . . . . . . . . . . . . . . . . . . . . . . .
Symptom Diagnosis 6E±176. . . . . . . . . . . . . . . . . . . . .
Default Matrix Table 6E±199. . . . . . . . . . . . . . . . . . . . .
On±Vehicle Service Camshaft Position
(CMP) Sensor 6E±201. . . . . . . . . . . . . . . . . . . . . . . . . .
Removal Procedure 6E±201. . . . . . . . . . . . . . . . . . . .
Inspection Procedure 6E±201. . . . . . . . . . . . . . . . . .
Installation Procedure 6E±201. . . . . . . . . . . . . . . . . .
Crankshaft Position (CKP) Sensor 6E±202. . . . . . . . .
Removal Procedure 6E±202. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±202. . . . . . . . . . . . . . . . . .
Engine Coolant Temperature (ECT) Sensor 6E±203.
Removal Procedure 6E±203. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±203. . . . . . . . . . . . . . . . . .
Intake Air Temperature (IAT) Sensor 6E±203. . . . . . .
Removal Procedure 6E±203. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±204. . . . . . . . . . . . . . . . . .
Manifold Absolute Pressure (MAP) Sensor 6E±204.
Removal Procedure 6E±204. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±205. . . . . . . . . . . . . . . . . .
Oil Temperature (OT) Sensor 6E±205. . . . . . . . . . . . .
Removal Procedure 6E±205. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±206. . . . . . . . . . . . . . . . . .
Malfunction Indicator Lamp (MIL) 6E±206. . . . . . . . . .
Removal and Installation Procedure 6E±206. . . . . .
Engine Control Module (ECM) 6E±206. . . . . . . . . . . .
Service Precaution 6E±206. . . . . . . . . . . . . . . . . . . .
Electrostatic Discharge (ESD) Damage 6E±206. . .
Removal Procedure 6E±207. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±208. . . . . . . . . . . . . . . . . .
EEPROM 6E±208. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description 6E±208. . . . . . . . . . . . . . . . . . . .
Functional Check 6E±208. . . . . . . . . . . . . . . . . . . . . .
Intake Throttle Position (ITP) Sensor 6E±208. . . . . . .
Removal Procedure 6E±208. . . . . . . . . . . . . . . . . . . .
Function Check 6E±209. . . . . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±209. . . . . . . . . . . . . . . . . .
Vehicle Speed Sensor (VSS) 6E±210. . . . . . . . . . . . .
Removal Procedure 6E±210. . . . . . . . . . . . . . . . . . . .
Inspection Procedure 6E±210. . . . . . . . . . . . . . . . . .
Installation Procedure 6E±210. . . . . . . . . . . . . . . . . .
Air Cleaner/Air Filter 6E±211. . . . . . . . . . . . . . . . . . . . .
Removal Procedure 6E±211. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±211. . . . . . . . . . . . . . . . . .
Accel Position (AP) Sensor 6E±211. . . . . . . . . . . . . . .
Removal Procedure 6E±211. . . . . . . . . . . . . . . . . . . .
Installation Procedure 6E±212. . . . . . . . . . . . . . . . . .
Accelerator Pedal Replacement 6E±212. . . . . . . . . . .

6E±26
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Output Components:
Output components are diagnosed for proper response to
control module commands. Components where
functional monitoring is not feasible will be monitored for
circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not
limited to, the following circuit:

EGR VSV

EGR EVRV

Electronic Transmission controls

Injector

Intake throttle

Glow plug

MIL control
Refer to ECM and Sensors in General Descriptions.
Passive and Active Diagnostic Tests
A passive test is a diagnostic test which simply monitors a
vehicle system or component. Conversely, an active test,
actually takes some sort of action when performing
diagnostic functions, often in response to a failed passive
test.
Intrusive Diagnostic Tests
This is any on-board test run by the Diagnostic
Management System which may have an effect on
vehicle performance or emission levels.
Warm-Up Cycle
A warm-up cycle means that engine at temperature must
reach a minimum of 70
C (160
F)
and rise at least 22
C
(40
F) over the course of a trip.
Freeze Frame
Freeze Frame is an element of the Diagnostic
Management System which stores various vehicle
information at the moment an emissions-related fault is
stored in memory and when the MIL is commanded on.
These data can help to identify the cause of a fault. Refer
to
Storing And Erasing Freeze Fame Data for more
detailed information.
Failure Records
Failure Records data is an enhancement of the OBD
Freeze Frame feature. Failure Records store the same
vehicle information as does Freeze Frame, but it will store
that information for any fault which is stored in on-board
memory, while Freeze Frame stores information only for
emission-related faults that command the MIL on.
Common OBD Terms
Diagnostic
When used as a noun, the word diagnostic refers to any
on-board test run by the vehicle's Diagnostic
Management System. A diagnostic is simply a test run on
a system or component to determine if the system or
component is operating according to specification. There
are many diagnostics, shown in the following list:

EGR

engine speed

vehicle speed

ECT
MAP

VSV

IAT

ITP

AP

FT (Fuel Temp)

RP (Rail Pressure)

OT (Oil Temp)

EGR EVRV

Idle SW

Brake SW
The Diagnostic Executive
The Diagnostic Executive is a unique segment of
software which is designed to coordinate and prioritize
the diagnostic procedures as well as define the protocol
for recording and displaying their results. The main
responsibilities of the Diagnostic Executive are listed as
follows:

Commanding the MIL (ªCheck Engineº lamp) on and
off

DTC logging and clearing

Freeze Frame data for the first emission related DTC
recorded

Current status information on each diagnostic
Diagnostic Information
The diagnostic charts and functional checks are designed
to locate a faulty circuit or component through a process
of logical decisions. The charts are prepared with the
requirement that the vehicle functioned correctly at the
time of assembly and that there are not multiple faults
present.
There is a continuous self-diagnosis on certain control
functions. This diagnostic capability is complemented by
the diagnostic procedures contained in this manual. The
language of communicating the source of the malfunction
is a system of diagnostic trouble codes. When a
malfunction is detected by the control module, a
diagnostic trouble code is set and the Malfunction
Indicator Lamp (MIL) (ªCheck Engineº lamp) is
illuminated.
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) looks the same as
the MIL you are already familiar with ªCheck Engineº
lamp.
Basically, the MIL is turned on when the ECM detects a
DTC that will impact the vehicle emissions.

When the MIL remains ªONº while the engine is
running, or when a malfunction is suspected due to a
driveability or emissions problem, a Powertrain
On-Board Diagnostic (OBD) System Check must be
performed. The procedures for these checks are
given in On-Board Diagnostic (OBD) System Check.
These checks will expose faults which may not be
detected if other diagnostics are performed first.
DTC Types
Characteristic of Code