Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 764
6E–80
TROOPER 6VE1 3.5L 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 2, SEN. 2—Tech 2 Range 0-1000 mV—
Monitors the exhaust oxygen sensor output voltage. The
PCM monitors the operating efficiency of catalytic
converter by comparing the output voltages of sensor 1
and sensor 2 in this bank. If the catalytic converter is
operating efficiently, the output voltage of sensor 1 will
have a greater fluctuation than that of sensor 2. If the
PCM detects an abnormal level of voltage fluctuation
from sensor 2, a DTC P0430 will be set, indicating that the
catalytic converter for this bank is no longer operating
efficiently.
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 1,
SEN 2/BANK 2 SEN. 1/BANK 2 SEN. 2 — 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 tool
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”.
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.
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.
Fuel System 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.
MISFIRE CUR. CYL. #1 /#2 /#3 /#4 / #5 / #6 — Tech 2
Range 0-255 Counts —
The misfire current counters increase at a rate according
to the number of the possible misfires being detected on
each cylinder. The counters may normally display some
activity, but the activity should be nearly equal for all the
cylinders.
6E–81
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
MISFIRE CUR. CYL. #1 /#2 /#3 /#4 / #5 / #6 — Tech 2
Range 0-65535 Counts —
The misfire history counters display the relative level of
misfire that has been detected on each cylinder. The
misfire history counters will not update or show any
activity until a misfire DTC (P0300) has become active.
MISFIRE FAILURES SINCE FIRST FAIL — Tech 2
Range 0-65535 Counts —
Indicates the number of 200 crankshaft revolution sample
periods during which the level of misfire was sufficiently
high to report a fail.
MISFIRE PASSES SINCE FIRST FAIL — Tech 2
Range 0-65535 Counts —
Indicates the number of 200 crankshaft revolution sample
periods during which the level of misfire was sufficiently
low to report a pass.
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.
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.
TOTAL MISFIRE CURRENT COUNT — Tech 2
Range 0-255 —
Indicates the total number of cylinder firing events that
were detected as being misfires during the last 200
crankshaft revolution sample period.
TP1 — Tech 2 Range 0%-100% —
TP (throttle position) angle is computed by the PCM from
the TP sensor voltage. TP angle should display “6-12%”
at idle and “79-83%” at wide open throttle.
TP2 — Tech 2 Range 0%-100% —
TP (throttle position) angle is computed by the PCM from
the TP sensor voltage. TP angle should display “88-94%”
at idle and “19-23%” at wide open throttle.
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, accessories off, brake not
applied and air conditioning off.
6E–82
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
3.5L V-6 Engine (Automatic and Manual Transmission)
Tech 2
Parameter
Data List
Units Displayed
Typical Data
Values (IDLE)
Typical Data
Values
(2500 RPM)
Refer To
A/C Clutch
Relay
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
14.6–14.7
14.6–14.7
General Description and
Operation, Fuel System
Metering Purpose
APP Sensor1
Engine
Percent
11–15
16–24
General Description and
Operation
APP Sensor2
Engine
Percent
85–89
74–82
General Description and
Operation
APP Sensor3
Engine
Percent
85–89
76–84
General Description and
Operation
Barometric
Pressure
Engine
kPa
61-104
(depends on
altitude and
barometric
pressure)
61-104
(depends on
altitude and
barometric
pressure)
General Description and
Operation
Brake Light
Switch
Engine
Open 0V/Closed
12V
Open 0V
Open 0V
Refer to Section 5
Check Trans
Lamp (Auto
Trans)
Engine
On/Off
Off
Off
4L30-E Automatic
Transmission Diagnosis
Cruise Main
Switch
Engine
Active/Inactive
Inactive
Inactive
Refer to Section 10
Cruise Set
Switch
Engine
Active/Inactive
Inactive
Inactive
Refer to Section 10
Cruise Cancel
Switch
Engine
Active/Inactive
Inactive
Inactive
Refer to Section 10
Cruise
Resume
Switch
Engine
Active/Inactive
Inactive
Inactive
Refer to Section 10
Decel Fuel
Cutoff
Engine
Active/Inactive
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
Speed
Engine
RPM
700
800
General Description and
Operation
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
Pintle Position
Engine
Steps
20-40
20-40
General Description and
Operation, EGR Pintle
Position Sensor
6E–83
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
Parameter
Refer To
Typical Data
Values
(2500 RPM)
Typical Data
Values (IDLE)
Units Displayed
Data List
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
—
EVAP Purge
Solenoid
Engine
Percent
0%
0%
Diagnosis, EVAP
Emission Canister Purge
Valve Check
EVAP Vent
Valve
Engine
On/Off
Off
Off
Diagnosis, EVAP Canister
Purge Solenoid and
EVAP Vacuum Switch
and Visual Check; DTCs:
P1441, P1442
Fuel System
Status
Engine
Open
Loop/Closed
Loop
Closed Loop
Closed Loop
General Description
Fuel Level
Engine
Percent
—
—
Engine Fuel
Fuel Level
Sensor
Engine
Volts
—
—
Engine Fuel
Fuel Tank
(Vapor)
Engine
Volts
1.02 – 1.86
1.02 – 2.57
General Description and
Operation
Pressure
Sensor
in. H2O
—
—
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
HO2S Bank 1
Sen.2
(millivolts)
(Auto Trans)
O2
Sensor
Data
Millivolts
200-700
changing slowly
250-650
changing slowly
General Description and
Operation, Fuel Metering
System
HO2S Bank 1
Sen.2
(millivolts)
(Manual
Trans)
O2
Sensor
Data
Millivolts
50-950
changing
quickly
50-950
changing
quickly
General Description and
Operation, Fuel Metering
System
HO2S Bank 1
Sen.3
(millivolts)
(Manual
Trans)
O2
Sensor
Data
Millivolts
200-700
changing slowly
250-650
changing slowly
General Description and
Operation, Catalyst
Monitor Heated Oxygen
Sensor (Manual Trans)
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