2002 ISUZU AXIOM display

6E±77
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
HO2S BANK2, SEN. 1 ÐTech 2 Range 0-1132 mVÐ
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. 2ÐTech 2 Range 0-1000 mVÐ
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. 1ÐTech 2 Displays NOT
READY or READYÐ
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 Ð Tech 2 Displays NOT
READY or READY Ð
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 Ð Tech 2
Range 00:00:00-99:99:99 HRS:MIN:SEC Ð
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 ª00:00:00º.
IAT (INTAKE AIR TEMPERATURE) Ð Tech 2 Range
±40
C to 151
C (±40
F to 304
F) Ð
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 Ð Tech 2 Range 0-25.5 Volts Ð
This represents the system voltage measured by the
PCM at its ignition feed.INJ. PULSE BANK 1/INJ. PULSE BANK 2 Ð Tech 2
Range 0-1000 msec. Ð
Indicates the amount of time the PCM is commanding
each injector ªONº 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 Ð
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 Ð Tech 2 Displays OPEN or
CLOSED Ð
ªCLOSEDº indicates that the PCM is controlling fuel
delivery according to oxygen sensor voltage. In ªOPENº
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 Ð Tech 2 Range 0.0-512 gm/s Ð
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
Ð Tech 2 Range 10-105 kPa (0.00-4.97 Volts) Ð
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 Ð Tech 2 Displays ON or OFF Ð
Indicates the PCM commanded state of the malfunction
indicator lamp.
MISFIRE CUR. CYL. #1 /#2 /#3 /#4 / #5 / #6 Ð Tech 2
Range 0-255 Counts Ð
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±78
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
MISFIRE CUR. CYL. #1 /#2 /#3 /#4 / #5 / #6 Ð Tech 2
Range 0-65535 Counts Ð
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 Ð Tech 2
Range 0-65535 Counts Ð
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 Ð Tech 2
Range 0-65535 Counts Ð
Indicates the number of 200 crankshaft revolution sample
periods during which the level of misfire was sufficiently
low to report a pass.
POWER ENRICHMENT Ð Tech 2 Displays ACTIVE
or INACTIVE Ð
ªACTIVEº 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 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.
TOTAL MISFIRE CURRENT COUNT Ð Tech 2
Range 0-255 Ð
Indicates the total number of cylinder firing events that
were detected as being misfires during the last 200
crankshaft revolution sample period.
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 ª3-5%º
at idle and ª100%º at wide open throttle.
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, accessories off, brake not
applied and air conditioning off.

6E±79
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
3.5L V-6 Engine (Automatic and Manual Transmission)
Tech 2
Parameter
Data ListUnits DisplayedTypical Data
Values (IDLE)Typical Data
Values
(2500 RPM)Refer To
A/C Clutch
RelayEngineOn/OffOffOffGeneral Description and
Operation, A/C Clutch
Circuit Operation
A/C RequestEngineYes/NoNoNoGeneral Description and
Operation, A/C Request
Signal
Air/Fuel RatioEngineRatio: _ to 114.714.7General Description and
Operation, Fuel System
Metering Purpose
APP Sensor1EnginePercent11±1335±40General Description and
Operation
APP Sensor2EnginePercent87±8860±65General Description and
Operation
APP Sensor3EnginePercent87±8850±57General Description and
Operation
Barometric
PressureEnginekPa61-104
(depends on
altitude and
barometric
pressure)61-104
(depends on
altitude and
barometric
pressure)General Description and
Operation
Brake Light
SwitchEngineOpen 0V/Closed
12VOpen 0VOpen 0VRefer to Section 5
Check Trans
Lamp (Auto
Trans)EngineOn/OffOffOff4L30-E Automatic
Transmission Diagnosis
Cruise Main
SwitchEngineActive/InactiveInactiveInactiveRefer to Section 10
Cruise Set
SwitchEngineActive/InactiveInactiveInactiveRefer to Section 10
Cruise Cancel
SwitchEngineActive/InactiveInactiveInactiveRefer to Section 10
Cruise
Resume
SwitchEngineActive/InactiveInactiveInactiveRefer to Section 10
Decel Fuel
CutoffEngineActive/InactiveInactiveInactiveGeneral Description and
Operation, Deceleration
Mode
Desired EGR
PositionEnginePercent0%0%General Description and
Operation, EGR Pintle
Position Sensor
Desired Idle
SpeedEngineRPM750800General Description and
Operation
ECT (Engine
Coolant Temp)EngineDegrees C,
Degrees F80-100
C
(176-212
F)80-100
C
(176-212
F)General Description and
Operation, Engine
Coolant Temperature
(ECT) Sensor
EGR Closed
Pintle PositionEngineSteps20-4020-40General Description and
Operation, EGR Pintle
Position Sensor

6E±80
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
ParameterRefer To Typical Data
Values
(2500 RPM) Typical Data
Values (IDLE) Units Displayed Data List
EGR Duty
CycleEnginePercent0%0%General Description and
Operation, Linear EGR
Operation and Results of
Incorrect Operation
EGR
FeedbackEngineVolts0.45-0.800.45-0.80Ð
EGR
NormalizedEnginePercent0%0%Ð
Engine LoadEnginePercent2.0% - 5.5%8.0% - 16.0%General Description and
Operation, Mass Air Flow
(MAF) Sensor
Time From
StartEngineSecVaries. Resets
at each engine
start.Varies. Resets
at each engine
start.
Ð
Engine SpeedEngineRPMWithin ±50 to
+100 of
ªDesired IdleºActual engine
speed
Ð
EVAP Purge
SolenoidEnginePercent0%0%Diagnosis, EVAP
Emission Canister Purge
Valve Check
EVAP Vent
ValveEngineOn/OffOffOffDiagnosis, EVAP Canister
Purge Solenoid and
EVAP Vacuum Switch
and Visual Check; DTCs:
P1441, P1442
Fuel System
StatusEngineOpen
Loop/Closed
LoopClosed LoopClosed LoopGeneral Description
Fuel LevelEnginePercentÐÐEngine Fuel
Fuel Level
SensorEngineVoltsÐÐEngine Fuel
Fuel Tank
(Vapor)EngineVolts1.02 ± 1.861.02 ± 2.57General Description and
Operation
Pressure
Sensorin. H2OÐÐ
Fuel PumpEngineOn/OffOnOnEngine Fuel
HO2S Bank 1
Sen.1
(millivolts)O2
Sensor
DataMillivolts50-950
changing
quickly50-950, always
changing
quicklyGeneral Description and
Operation, Fuel control
HO2S
HO2S Bank 1
Sen.2
(millivolts)
(Auto Trans)O2
Sensor
DataMillivolts200-700
changing slowly250-650
changing slowlyGeneral Description and
Operation, Fuel Metering
System
HO2S Bank 1
Sen.2
(millivolts)
(Manual
Trans)O2
Sensor
DataMillivolts50-950
changing
quickly50-950
changing
quicklyGeneral Description and
Operation, Fuel Metering
System
HO2S Bank 1
Sen.3
(millivolts)
(Manual
Trans)O2
Sensor
DataMillivolts200-700
changing slowly250-650
changing slowlyGeneral Description and
Operation, Catalyst
Monitor Heated Oxygen
Sensor (Manual Trans)

6E±81
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
ParameterRefer To Typical Data
Values
(2500 RPM) Typical Data
Values (IDLE) Units Displayed Data List
HO2S Bank 2
Sen.1
(millivolts)O2
Sensor
DataMillivolts50-950
changing
quickly50-950
changing
quicklyGeneral Description and
Operation, Fuel Control
HO2S
HO2S Bank 2
Sen.2
(millivolts)
(Auto trans)O2
Sensor
DataMillivolts200-700
changing slowly250-650
changing slowlyGeneral Description and
Operation, Fuel Metering
System
HO2S Bank 1
Sen.1
(ready/not
ready)O2
Sensor
DataReady
Yes/NoReady
Ye sReady
Ye sGeneral Description and
Operation, Fuel Control
HO2S; DTC: P0135
HO2S Bank 2
Sen.1
(ready/not
ready)O2
Sensor
DataReady
Yes/NoReady
Ye sReady
Ye sGeneral Description and
Operation, Fuel Control
HO2S
HO2S
Warm-Up Time
Bank 1 Sen.1O2
Sensor
DataSeconds25-4525-45General Description and
Operation, Fuel Control
HO2S
HO2S
Warm-Up Time
Bank 1 Sen.2O2
Sensor
DataSeconds60-10060-100General Description and
Operation, Fuel Control
HO2S
HO2S
Warm-Up Time
Bank 2 Sen.1O2
Sensor
DataSeconds25-4525-45General Description and
Operation, Fuel Control
HO2S
HO2S
Warm-Up Time
Bank 2 Sen.2O2
Sensor
DataSeconds60-10060-100General Description and
Operation, Catalyst
Monitor Heated Oxygen
Sensor (Auto Trans)
IAT (Intake Air
Temp)EngineDegrees C,
Degrees F0-100
C,
depends on
underhood
temperature0-80
C,
depends on
underhood
temperatureGeneral Description and
Operation, Intake Air
Temperature (IAT) Sensor
Illumination
SwitchEngineClosed 0V/Open
12VClosed 0VClosed 0VRefer to Section 8
Ignition
VoltageEngineVolts12.8-14.112.8-14.1General Description and
Operation, Electronic
Ignition System
Inj. Pulse Bank
1EngineMilliseconds2.0-4.02.5-4.0General Description, Fuel
Metering, Fuel Injector
Inj. Pulse Bank
2EngineMilliseconds2.0-4.02.5-4.0General Description, Fuel
Metering, Fuel Injector
Knock PresentEngineNo/YesNoNoGeneral Description and
ION Sensing Module
Knock SignalEnginePercent1~41~4General Description and
ION Sensing Module
Knock Sensor
RetardEngine
CA00General Description and
ION Sensing Module
Knock CounterEngineCountsÐÐGeneral Description
Long Term FT
Bank 1 (Long
Term Fuel
Trim)MisfireCounts and
Percentage100 to 150
counts, ±22%
to +17%100 to 150
counts, ±22%
to +17%Diagnosis, Fuel Trim
System Monitor; DTCs:
P0171, P0172

6E±82
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
ParameterRefer To Typical Data
Values
(2500 RPM) Typical Data
Values (IDLE) Units Displayed Data List
Long Term FT
Bank 2 (Long
Term Fuel
Trim)MisfireCounts and
Percentage100 to 150
counts, ±22%
to +17%100 to 150
counts, ±22%
to +17%Diagnosis, Fuel Trim
System Monitor; DTCs:
P0171
MAF (Mass Air
Flow)EngineGrams per
second2.85-6.659.5-16.5General Description and
Operation, MAF; DTCs:
P101, P0102, P0103
MAP kPa
(Manifold
Absolute
EngineKilopascals23-4019-32General Description and
Operation, Manifold
Absolute Pressure (MAP)Absolute
Pressure)Volts0.65-1.320.46-1.10Absolute Pressure (MAP)
Sensor; DTCs: P0106,
P0107, P0108
MILEngineOn/OffOffOffOn-Board Diagnostic
System Check
Misfire Cur. Cyl
#1MisfireCounts0-20-2DTC P0300
Misfire Cur. Cyl
#2MisfireCounts0-20-2DTC P0300
Misfire Cur. Cyl
#3MisfireCounts0-20-2DTC P0300
Misfire Cur. Cyl
#4MisfireCounts0-20-2DTC P0300
Misfire Cur. Cyl
#5MisfireCounts0-20-2DTC P0300
Misfire Cur. Cyl
#6MisfireCounts0-20-2DTC P0300
Misfire Hist.
Cyl #1MisfireCounts00DTC P0300
Misfire Hist.
Cyl #2MisfireCounts00DTC P0300
Misfire Hist.
Cyl #3MisfireCounts00DTC P0300
Misfire Hist.
Cyl #4MisfireCounts00DTC P0300
Misfire Hist.
Cyl #5MisfireCounts00DTC P0300
Misfire Hist.
Cyl #6MisfireCounts00DTC P0300
Misfire Failures
Since First FailMisfireCounts00DTC P0300
Misfire Passes
Since First FailMisfireCounts00DTC P0300
PNP
(Park/Neutral
Position)EngineP-N /
R-D-3-2-LP-NP-N4L30-E Automatic
Transmission Diagnosis
Power
EnrichmentEngineNO/YESNONOGeneral Description and
Operation, Acceleration
Mode
PSP Switch
(Power
Steering
Pressure)EngineNormal/HiNormal
PressureNormal
PressureRefer to 2A Section

6E±83
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Tech 2
ParameterRefer To Typical Data
Values
(2500 RPM) Typical Data
Values (IDLE) Units Displayed Data List
Spark
(Advance)EngineDegrees Before
Top Dead Center15-2234-44General Description and
Operation, Electronic
Ignition System
Start-Up ECT
(Engine
Coolant Temp)EngineDegrees C,
Degrees FDepends on
engine coolant
temperature at
time of start-upDepends on
engine coolant
temperature at
time of start-upGeneral Description and
Operation, Engine
Coolant Temperature
(ECT) Sensor
Start-Up IAT
(Intake Air
Temp)EngineDegrees C,
Degrees FDepends on
intake air
temperature at
time of start-upDepends on
intake air
temperature at
time of start-upGeneral Description and
Operation, Intake Air
Temperature (IAT) Sensor
TCC Cruise
Brake SwitchEngineActive/InactiveActiveActiveRefer to Section 10
Total Misfire
Current CountMisfireCounts0-50-5DTC P0300
TP Sensor 1
(Throttle
Position
Sensor 1)EnginePercentage8±1228±36General Description and
Operation, Throttle
Position (TP) Sensor
TP Sensor 2
(Throttle
Position
Sensor 2)EnginePercentage8±1228±36General Description and
Operation, Throttle
Position (TP) Sensor
Throttle at IdleEngineNo/YesYe sNoGeneral Description and
Operation, Throttle
Position (TP) Sensor
Upshift Lamp
(manual trans)EngineOn/OffOffOffManual Transmission
Vehicle SpeedEngineMPH / km/h004L30-E Automatic
Transmission Diagnosis
Weak CylinderMisfireCylinder #ÐÐDTC P0300

6E±97
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Starter Control System Check

 
StepNo Ye s Value(s) Action
31. Gear position is ªpark or neutralº.
2. Do not depress the accelerator pedal.
3. Turn the key to ªSTARTº position.
4. Release the key switch to the to ªONº position.
Does the engine crank?
ÐGo to Step 27Go to Step 4
41. Install the Tech 2.
2. Select ªDisplay DTCsº with the Tech 2.
Are any DTCs stored?
ÐGo to Step 5Go to Step 6
5Review and record for Tech 2 Failure Records data and
DTCs.
Were any DTCs information stored?
Ð
Go to DTCs
Chart
Ð
61. Gear position is ªpark or neutralº.
2. Do not depress the accelerator pedal.
3. Turn the key to ªSTARTº position.
Is the engine cranking?
ÐGo to Step 27Go to Step 7
7Check the anti±theft module circuit. Check the circuit
between PCM and anti±theft module.
Is the problem found?
ÐGo to Step 8Go to Step 9
8Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
91. Probe the anti-theft module circuit to GND.
2. Turn the key to ªSTARTº position.
Is the engine cranking?
ÐGo to Step 10Go to Step 11
10Check the anti-theft system. Refer to section 8H
anti-theft.
ÐVerify repairÐ
11Check the starter relay, starter fuse and engine fuse.
Is the problem found?
Go to Step 12Go to Step 13
12Replace the starter relay, starter fuse and engine fuse.
Is the action complete?
ÐVerify repairÐ
13Check the starter circuit.
1. Ignition is ºOFFº.
2. Remove the starter relay.
3. Check the circuit between starter relay and starter
motor.
Is the problem found?
ÐGo to Step 14Go to Step 15
14Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
15Check the starter circuit.
1. Remove the main fuse (100A).
2. Check the circuit between main fuse and starter
motor.
3. Check the circuit between GND and starter motor.
Is the problem found?
ÐGo to Step 16Go to Step 17