Isuzu Trooper (1998-2002 year). Manual — part 289
6E–69
ENGINE DRIVEABILITY AND EMISSIONS
HO2S BANK2, SEN. 1—Tech 2 Range 0-1132 mV—
Represents the fuel control exhaust oxygen sensor
output voltage. Should fluctuate constantly within a range
between 10mV (lean exhaust) and 1000 mV (rich
exhaust) while operating in closed loop.
HO2S BANK 1, SEN. 1—Tech 2 Displays NOT
READY or READY—
Indicates the status of the exhaust oxygen sensor. The
Tech 2 will indicate that the exhaust oxygen sensor is
ready when the PCM detects a fluctuating HO2S voltage
sufficient to allow closed loop operation. This will not
occur unless the exhaust oxygen sensor is warmed up.
HO2S BANK 2, SEN. 1 — Tech 2 Displays NOT
READY or READY —
Indicates the status of the exhaust oxygen sensor. The
Tech 2 will indicate that the exhaust oxygen sensor is
ready when the PCM detects a fluctuating HO2S voltage
sufficient to allow closed loop operation. This will not
occur unless the exhaust oxygen sensor is warmed up.
HO2S WARM UP TIME BANK 1, SEN. 1/BANK 2
SEN. 1 — Tech 2 Range 00:00:00-99:99:99
HRS:MIN:SEC —
Indicates warm-up time for each HO2S. The HO2S
warm-up time is used for the HO2S heater test. The PCM
will run the heater test only after a cold start (determined
by engine coolant and intake air temperature at the time
of start-up) and only once during an ignition cycle. When
the engine is started the PCM will monitor the HO2S
voltage. When the HO2S voltage indicates a sufficiently
active sensor, the PCM looks at how much time has
elapsed since start-up. If the PCM determines that too
much time was required for the HO2S to become active,
a DTC will set. If the engine was warm when started,
HO2S warm-up will the display “00:00:00”.
IAC POSITION — Tech 2 Range 0-255 Counts —
Displays the commanded position of the idle air control
pintle in counts. A larger number of counts means that
more air is being commanded through the idle air
passage. Idle air control should respond fairly quickly to
changes in engine load to maintain desired idle RPM.
IAT (INTAKE AIR TEMPERATURE) — Tech 2 Range
–40
°
C to 151
°
C (–40
°
F to 304
°
F) —
The PCM converts the resistance of the intake air
temperature sensor to degrees. Intake air temperature
(IAT) is used by the PCM to adjust fuel delivery and spark
timing according to incoming air density.
IGNITION 1 — Tech 2 Range 0-25.5 Volts —
This represents the system voltage measured by the
PCM at its ignition feed.
INJ. PULSE BANK 1/INJ. PULSE BANK 2 — Tech 2
Range 0-1000 msec. —
Indicates the amount of time the PCM is commanding
each injector “ON” during each engine cycle. A longer
injector pulse width will cause more fuel to be delivered.
Injector pulse width should increase with increased
engine load.
KS NOISE CHANNEL (Knock Sensor) —
Indicates the output from the KS noise channel. There is
always some electrical noise in an engine compartment
and to avoid mistaking this as engine knock, the output
from the knock sensor is compared to the output from the
noise channel. A knock condition is not set unless the
knock sensor output is greater than the noise channel
output.
LONG TERM FUEL TRIM BANK 1/BANK 2 —
The long term fuel trim is derived from the short term fuel
trim values and represents a long term correction of fuel
delivery for the bank in question. A value of 0% indicates
that fuel delivery requires no compensation to maintain
the PCM commanded air/fuel ratio. A negative value
significantly below 0% indicates that the fuel system is
rich and fuel delivery is being reduced (decreased injector
pulse width). A positive value significantly greater than
0% indicates that a lean condition exists and the PCM is
compensating by adding fuel (increased injector pulse
width). Because long term fuel trim tends to follow short
term fuel trim, a value in the negative range due to
canister purge at idle should not be considered unusual.
Fuel trim values at maximum authority may indicate an
excessively rich or lean system.
LOOP STATUS — Tech 2 Displays OPEN or
CLOSED —
“CLOSED” indicates that the PCM is controlling fuel
delivery according to oxygen sensor voltage. In “OPEN”
the PCM ignores the oxygen sensor voltage and bases
the amount of fuel to be delivered on TP sensor, engine
coolant, and MAF sensor inputs only.
MAF — Tech 2 Range 0.0-512 gm/s —
MAF (mass air flow) is the MAF input frequency
converted to grams of air per second. This indicates the
amount of air entering the engine.
MAP — Tech 2 Range 10-105 kPa (0.00-4.97 Volts)
—
The manifold absolute pressure (MAP) sensor measures
the change in the intake manifold pressure from engine
load, EGR flow, and speed changes. As intake manifold
pressure increases, intake vacuum decreases, resulting
in a higher MAP sensor voltage and kPa reading. The
MAP sensor signal is used to monitor intake manifold
pressure changes during the EGR flow test, to update the
BARO reading, and as an enabling factor for several of
the diagnostics.
MIL — Tech 2 Displays ON or OFF —
Indicates the PCM commanded state of the malfunction
indicator lamp.
POWER ENRICHMENT — Tech 2 Displays ACTIVE
or INACTIVE —
“ACTIVE” displayed indicates that the PCM has detected
conditions appropriate to operate in power enrichment
mode. The PCM will command power enrichment mode
when a large increase in throttle position and load is
detected. While in power enrichment mode, the PCM will
increase the amount of fuel delivered by entering open
loop and increasing the injector pulse width. This is done
to prevent a possible sag or hesitation from occurring
during acceleration.
6E–70
ENGINE DRIVEABILITY AND EMISSIONS
SPARK — Tech 2 Range –64
°
to 64
°
—
Displays the amount of spark advance being commanded
by the PCM on the IC circuit.
START-UP ECT — Tech 2 Range –40
°
C to 151
°
C
(–40
°
F to 304
°
F) —
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 — Tech 2 Range –40
°
C to 151
°
C
(–40
°
F to 304
°
F) —
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 — Tech 2 Range 0%-100% —
TP (throttle position) angle is computed by the PCM from
the TP sensor voltage. TP angle should display “0%” at
idle and “100%” at wide open throttle.
TP SENSOR — Tech 2 Range 0.00-5.00 Volts —
The voltage being monitored by the PCM on the TP
sensor signal circuit.
CATALYST PROTECTION MODE — Tech 2 Displays
YES or NO —
“YES” 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 — Tech 2 Range 0-255 km/h
(0-155 mph) —
The vehicle speed sensor signal is converted into km/h
and mph for display.
WEAK CYLINDER — Tech 2 Displays Cylinder
Number —
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–71
ENGINE DRIVEABILITY AND EMISSIONS
3.2/3.5L V-6 Engine
Tech 2
Parameter
Data List
Units
Displayed
Typical Data
Values (IDLE)
Typical Data
Values
(2500 RPM)
Refer To
A/C Clutch
Engine
On/Off
Off
Off
General Description and
Operation, A/C Clutch
Circuit Operation
A/C Request
Engine
Yes/No
No
No
General Description and
Operation, A/C Request
Signal
Air/Fuel Ratio
Engine
Ratio: _ to
1
14.7
14.7
General Description and
Operation, Fuel System
Metering Purpose
Barometric
Pressure
Engine
kPa
61-104 (depends
on altitude and
barometric)
61-104 (depends
on altitude and
barometric)
General Description and
Operation
CMP Act.
Counter (Cam
Position Activity)
Engine
Counts
0-255, always
increasing
0-255, always
increasing
DTC P0341 and P0342
Decel Fuel
Mode
Engine
Active/Inac
tive
Inactive
Inactive
General Description and
Operation, Deceleration
Mode
Desired EGR
Position
Engine
Percent
0%
0%
General Description and
Operation, EGR Pintle
Position Sensor
Desired Idle
Engine
RPM
750
—
General Description and
Operation, Idle Air Control
(IAC) Valve
ECT (Engine
Coolant Temp)
Engine
Degrees C,
Degrees F
80-100
°
C
(176-212
°
F)
80-100
°
C
(176-212
°
F)
General Description and
Operation, Engine Coolant
Temperature (ECT) Sensor
EGR Closed
Valve Pintle
Position
Engine
Steps
20-40
20-40
General Description and
Operation, EGR Pintle
Position Sensor
EGR Duty Cycle
Engine
Percent
0%
0%
General Description and
Operation, Linear EGR
Operation and Results of
Incorrect Operation
EGR Feedback
Engine
Volts
0.45-0.80
0.45-0.80
—
EGR
Normalized
Engine
Percent
0%
0%
—
Engine Load
Engine
Percent
2.0% - 5.5%
8.0% - 16.0%
General Description and
Operation, Mass Air Flow
(MAF) Sensor
Time From Start
Engine
Sec
Varies. Resets at
each engine
start.
Varies. Resets at
each engine
start.
—
Engine Speed
Engine
RPM
Within –50 to
+100 of “Desired
Idle”
Actual engine
speed
DTCs: P1508, P1509
Fuel Pump
Engine
On/Off
On
On
Engine Fuel
HO2S Bank 1
Sen.1 (millivolts)
O2 Sensor
Data
Millivolts
50-950 changing
quickly
50-950, always
changing quickly
General Description and
Operation, Fuel control
HO2S
6E–72
ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
Parameter
Refer To
Typical Data
Values
(2500 RPM)
Typical Data
Values (IDLE)
Units
Displayed
Data List
HO2S Bank 2
Sen.1 (millivolts)
O2 Sensor
Data
Millivolts
50-950 changing
quickly
50-950 changing
quickly
General Description and
Operation, Fuel Control
HO2S
HO2S Bank 1
Sen.1
(ready/not
ready)
O2 Sensor
Data
Ready
Yes/No
Ready
Yes
Ready
Yes
General Description and
Operation, Fuel Control
HO2S; DTC: P0135
HO2S Bank 2
Sen.1
(ready/not
ready)
O2 Sensor
Data
Ready
Yes/No
Ready
Yes
Ready
Yes
General Description and
Operation, Fuel Control
HO2S
HO2S Warm-Up
Time Bank 1
Sen.1
O2 Sensor
Data
Seconds
25-45
25-45
General Description and
Operation, Fuel Control
HO2S
HO2S Warm-Up
Time Bank 2
Sen.1
O2 Sensor
Data
Seconds
25-45
25-45
General Description and
Operation, Fuel Control
HO2S
IAT (Intake Air
Temp)
Engine
Degrees C,
Degrees F
0-100
°
C,
depends on
underhood
0-80
°
C, depends
on underhood
General Description and
Operation, Intake Air
Temperature (IAT) Sensor
Ignition Voltage
Engine
Volts
12.8-14.1
12.8-14.1
General Description and
Operation, Electronic
Ignition System
Inj. Pulse Bank
1
Engine
Millisecond
s
2.0-4.0
2.5-4.0
General Description, Fuel
Metering, Fuel Injector
Inj. Pulse Bank
2
Engine
Millisecond
s
2.0-4.0
2.5-4.0
General Description, Fuel
Metering, Fuel Injector
KS Noise
Channel (Knock
Sensor)
Engine
Volts
0.10-0.40
0.50-1.75
General Description and
Operation, Knock Sensor
Purpose and Operation;
DTCs: P0352, P0327
Loop Status
Engine
Open/Clos
ed
Closed
Closed
General Description and
Operation, Fuel Metering
System; DTCs:
P0125-P0155
MAF (Mass Air
Flow)
Engine
Grams per
second
2.85-6.65
9.5-16.5
General Description and
Operation, MAF; DTCs:
P101, P0102, P0103
MAP kPa
(Manifold
Absolute
Pressure)
Engine
Kilopascals
—
—
General Description and
Operation, Manifold
Absolute Pressure (MAP)
Sensor; DTCs: P0106,
P0107, P0108
MIL
Engine
On/Off
Off
Off
On-Board Diagnostic
System Check
Power
Enrichment
Engine
Inactive/Ac
tive
Inactive
Inactive
General Description and
Operation, Acceleration
Mode
Spark
(Advance)
Engine
Degrees
Before Top
Dead
Center
15-22
34-44
General Description and
Operation, Electronic
Ignition System
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