1998 ISUZU TROOPER Ecm

6E±14
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Pinouts
ECM Pinout Table, 32-Way Connector ± J1 RED ± Upper
060RW138
J1 ± RED
PINSIGNAL
1FUEL TEMPERATURE
2SPARE ANALOG 1
3+5VB1
4+5VB2
5SPARE ANALOG 3
6ACCEL POS OUT 1
7NOT USED
8SPARE OUT 2 (TCC)
9EVRV (EGR)
10IGN RELAY
11GLOW PLUG LAMP
12DIAGNOSTIC LAMP
13VSV (EXHAUST #2)
14RAIL PRESS CNTRL VALVE
15GLOW PLUG RELAY
16VSV (EXHAUST #1)

6E±15 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Pinout Table, 32-Way Connector ± J1 RED ± Lower
060RW137
J1 ± RED
PINSIGNAL
17SPARE ANALOG 4
18INTAKE SM POSITION
19VEHICLE SPEED
20MT NEUTRAL
21REVERSE SW
22ACCEL POS OUT 2
23THERMO SW RELAY
24SPARE OUT 3 (TURBO)
25VSV (EGR)
26TACHOMETER 1
27BRAKE SW 1
28NOT USED (BRAKE 2)
29A/T NEUTRAL SW
30NO CONNECTION
31AC REQUEST SW
32AT SOLENOID

6E±16
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Pinout Table, 32-Way Connector ± J2 BLUE ± Upper
060RW138
J2 ± BLUE
PINSIGNAL
1INJECTOR A RTN
2INJECTOR B RTN
3INJECTOR C RTN
4INJECTOR D RTN
5CLASS 2
6SDATA
7RAIL OIL PRESSURE
8IDLE SW
9IGN SW
10BATTERY
11QUICK WARM REQ. SW
12PARTIAL IDLE SW
13CERAMIC HTR REQUEST SW
14INTAKE SW S2B
15INTAKE SW S1T
16INTAKE SW S1B

6E±17 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Pinout Table, 32-Way Connector ± J2 BLUE ± Lower
060RW137
J2 ± BLUE
PINSIGNAL
17COOLANT TEMP OUT
18OIL TEMPERATURE
19TDC/CAM
20SPARE ANALOG 2
21INTAKE AIR TEMPERATURE
22+5VRTN2
23BOOST/INLET PRESSURE
24+5VRTN3
25ACCELERATOR POSITION
26+5VRTN1
27EGR VACUUM PRESSURE
28INTAKE SM S2T
29DIAGNOSTIC REQUEST SW
30COOLANT TEMPERATURE
31A/T PARK SW
32CRANKSHAFT

6E±18
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
ECM Pinout Table, 5-Way Connector ± J3
060RW139
J3
PINSIGNAL
1IGNITION
2IGNITION
3PWR GND
4PWR GND
5INJECTOR H1

6E±20
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
NumberNameLocation
20Rail Pressure Control ValveIn the High Pressure Oil Pump
21Fuel PumpIn the High Pressure Oil Pump
22EVRVOn the Intake Manifold
23MAP (Manifold Absolute Pressure) SensorOn the Intake Manifold
24EGR ValveOn the Intake Manifold
25Air CleanerAt the left Engine Room
26ECMBehind the Air Cleaner

6E±23 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Abbreviations Charts
List of abbreviations which may be used in this section.
Abbreviations
TermAbbreviationsTerm
A/CAir ConditionerBLKBlack
A/TAutomatic TransmissionBLUBlue
ACCAccessoryBRNBrown
APAccel PositionGRNGreen
ASMAssemblyGRYGray
CKPCrank PositionLT BLULight Blue
CMPCam PositionLT GRNLight Green
DLCData Link ConnectorORNOrange
DTCDiagnosis Trouble CodePNKPink
DVMDigital Volt MeterREDRed
ECMEngine Control ModuleVIOViolet
ECTEngine Coolant TemperatureWHTWhite
EGRExhaust Gas RecircurationYELYellow
EVRVElectric Vacuum Regulating Valve
EXHExhaust
FTFuel Temperature
IATIntake Air Temperature
IGIgnition
ITPIntake Throttle Position
M/TManual Transmission
MAPManifold Absolute Pressure
MILMulfunction Indicator Lamp
OBDOn-Board Diagnostic
OTOil Temperature
QOSQuick on Start System
QWSQuick Warming-Up System
RPRail Pressure
RPCVRail Pressure Control Valve
SRSSupplemental Restraint System
STStart
SWSwitch
TEMPTemperature
TODTorque on Demand
VSSVehicle Speed Sensor
VSVVacuum Switching Valve
HEUIHydraulically Actuated Electronically Controlled Unit
InjectorInjector

6E±25 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
General Service Information
Serviceability Issues
Non-OEM Parts
All of the OBD diagnostics have been calibrated to run
with OEM parts. Accordingly, if commercially sold sensor
or switch is installed, it makes a wrong diagnosis and turn
on the MIL (ªCheck Engineº lamp).
Aftermarket electronics, such as cellular phones,
stereos, and anti-theft devices, may radiate EMI into the
control system if they are improperly installed. This may
cause a false sensor reading and turn on the MIL (ªCheck
Engineº lamp).
Poor Vehicle Maintenance
The sensitivity of OBD diagnostics will cause the MIL
(ªCheck Engineº lamp) to turn on if the vehicle is not
maintained properly. Restricted oil filters, fuel filters, and
crankcase deposits due to lack of oil changes or improper
oil viscosity can trigger actual vehicle faults that were not
previously monitored prior to OBD. Poor vehicle
maintenance can not be classified as a ªnon-vehicle
faultº, but with the sensitivity of OBD diagnostics, vehicle
maintenance schedules must be more closely followed.
Related System Faults
Many of the OBD system diagnostics will not run if the
ECM detects a fault on a related system or component.
Visual/Physical Engine Compartment
Inspection
Perform a careful visual and physical engine
compartment inspection when performing any diagnostic
procedure or diagnosing the cause of an emission test
failure. This can often lead to repairing a problem without
further steps. Use the following guidelines when
performing a visual/physical inspection:

Inspect all vacuum hoses for punches, cuts,
disconnects, and correct routing.

Inspect hoses that are difficult to see behind other
components.

Inspect all wires in the engine compartment for proper
connections, burned or chafed spots, pinched wires,
contact with sharp edges or contact with hot exhaust
manifolds or pipes.
Basic Knowledge of Tools Required
NOTE: Lack of basic knowledge of this powertrain when
performing diagnostic procedures could result in an
incorrect diagnosis or damage to powertrain
components. Do not attempt to diagnose a powertrain
problem without this basic knowledge.
A basic understanding of hand tools is necessary to effec-
tively use this section of the Service Manual.
Serial Data Communications
Class II Serial Data Communications
This vehicle utilizes the ªClass IIº communication system.
Each bit of information can have one of two lengths: longor short. This allows vehicle wiring to be reduced by
transmitting and receiving multiple signals over a single
wire. The messages carried on Class II data streams are
also prioritized. If two messages attempt to establish
communications on the data line at the same time, only
the message with higher priority will continue. The device
with the lower priority message must wait.
On this vehicle the Tech 2 displays the actual values for
vehicle parameters. It will not be necessary to perform
any conversions from coded values to actual values.
On-Board Diagnostic (OBD)
On-Board Diagnostic Tests
A diagnostic test is a series of steps, the result of which is
a pass or fail reported to the diagnostic executive. When
a diagnostic test reports a pass result, the diagnostic
executive records the following data:

The diagnostic test has been completed since the last
ignition cycle.

The diagnostic test has passed during the current
ignition cycle.

The fault identified by the diagnostic test is not
currently active.
When a diagnostic test reports a fail result, the diagnostic
executive records the following data:

The diagnostic test has been completed since the last
ignition cycle.

The fault identified by the diagnostic test is currently
active.

The fault has been active during this ignition cycle.

The operating conditions at the time of the failure.
Comprehensive Component Monitor
Diagnostic Operation
Comprehensive component monitoring diagnostics are
required to operate engine properly.
Input Components:
Input components are monitored for circuit continuity and
out-of-range values. This includes rationality checking.
Rationality checking refers to indicating a fault when the
signal from a sensor does not seem reasonable. Accel
Position (AP) sensor that indicates high throttle position
at low engine loads or MAP voltage. Input components
may include, but are not limited to the following sensors:

Intake Air Temperature (IAT) Sensor

Crankshaft Position (CKP) Sensor

Intake throttle Position (ITP) Sensor

Engine Coolant Temperature (ECT) Sensor

Camshaft Position (CMP) Sensor

Manifold absolute Pressure (MAP) Sensor

Accel Position Sensor

Fuel Temp Sensor

Rail Pressure Sensor

Oil Temp Sensor

EGR Pressure Sensor

Vehicle Speed Sensor