automatic transmission ISUZU AXIOM 2002 Service Owner's Manual

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±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±98
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Starter Control System Check

 
StepNo Ye s Value(s) Action
16Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
17Check the starter signal circuit.
1. Remove the starter fuse (10A).
2. Disconnect the PCM.
3. Check the circuit between Powertrain Control
module (PCM) and starter fuse.
Is the problem found?
ÐGo to Step 18Go to Step 19
18Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
19Check the ªpark or neutralº signal circuit.
1. Remove the starter relay.
2. Disconnect the PCM.
3. Check the circuit between PCM and starter relay.
Is the problem found?
ÐGo to Step 20Go to Step 21
20Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
21Check the ªpark or neutralº signal circuit.
1. Remove the starter relay.
2. Disconnect the MODE switch.
3. Remove the engine (15A) fuse and back up (15A)
fuse.
4. Check the circuit between MODE switch and starter
relay.
5. Check the circuit between MODE switch and engine
fuse.
6. Check the circuit between MODE switch and PCM.
7. Check the circuit between MODE switch and back
up fuse.
Is the problem found?
ÐGo to Step 22Go to Step 23
22Repair the circuit as necessary.
Is the action complete?
ÐVerify repairÐ
23Check the MODE switch. Refer to 4L30E Automatic
transmission.
Is the problem found?Go to Step 24Go to Step 25
24Replace the MODE switch.
Is the action complete?
ÐVerify repairÐ
25Check the starter motor. Refer to Section 6D Engine
Electrical.
Is the problem found?Go to Step 26Go to Step 28
26Replace the starter motor.
Is the action complete?
ÐVerify repairÐ

6E±222
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0171 Fuel Trim System Lean Bank 1
060R200054
Circuit Description
To provide the best possible combination of driveability,
fuel economy, and emission control, a ªclosed loopº
air/fuel metering system is used. While in ªclosed loopº,
the powertrain control module (PCM) monitors the Bank 1
HO2S 1 and Bank 2 HO2S 1 signals and adjusts fuel
delivery based upon the HO2S signal voltages. A change
made to fuel delivery will be indicated by the long and
short term fuel trim values which can be monitored with a
Tech 2. Ideal fuel trim values are around 0%; if the HO2S
signals are indicating a lean condition the PCM will add
fuel, resulting in fuel trim values above 0%. If a rich
condition is detected, the fuel trim values will be below
0%, indicating that the PCM is reducing the amount of fuel
delivered. If an excessively lean condition is detected on
Bank 1, the PCM will set DTC P0171.
The PCM's maximum authority to control long term fuel
trim allows a range between ±15% (automatic
transmission) or ±12% (manual transmission) and +20%.
The PCM monitors fuel trim under various engine
speed/load fuel trim cells before determining the status of
the fuel trim diagnostic.
Conditions for Setting the DTC

None of the following: EGR DTCs, HO2S DTCs,
(response, transition, open, low volts, no activity), MAF
DTCs, TP sensor DTCs, MAP DTCs, IAT DTCs,
canister purge DTCs, EVAP DTCs, injector circuit
DTCs, or misfire DTCs.
Engine coolant temperature is between 6
C (42.8
F)
and 105
C (221
F).

Intake air temperature is between ±40
C (±40
F) and
120
C (248
F).

Manifold absolute pressure is between 24 kPa and 99
kPa.

Throttle angle is steady below 95%.

Vehicle speed is below 136 km/h (85 mph).

Engine speed is between 400 and 6,000 RPM.

Barometric pressure is greater than 72.5 kPa.

Mass air flow is between 2 g/second and 200 g/second.

Ignition voltage is above 9.5 volts.

Fuel system is in ªclosed loopº.

Canister purge duty cycle is greater than 0% if on.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P0171 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

6E±226
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0172 Fuel Trim System Rich Bank 1
060R200054
Circuit Description
To provide the best possible combination of driveability,
fuel economy, and emission control, a ªclosed loopº
air/fuel metering system is used. While in ªclosed loopº,
the powertrain control module (PCM) monitors the Bank 1
heated oxygen sensors (HO2S) 1 and Bank 2 HO2S 1
signals and adjusts fuel delivery based upon the HO2S
signal voltages. A change made to fuel delivery will be
indicated by the long and short term fuel trim values which
can be monitored with a Tech 2. Ideal fuel trim values are
around 0%; if the HO2S signals are indicating a lean
condition the PCM will add fuel, resulting in fuel trim
values above 0%. If a rich condition is detected, the fuel
trim values will be below 0%, indicating that the PCM is
reducing the amount of fuel delivered. If an excessively
rich condition is detected on Bank 1, the PCM will set DTC
P0172.
The PCM's maximum authority to control long term fuel
trim allows a range between ±15% (automatic
transmission) or ±12 (manual transmission) and +20%.
The PCM's maximum authority to control short term fuel
trim allows a range between ±11% and +20%. The PCM
monitors fuel trim under various engine speed/load fuel
trim cells before determining the status of the fuel trim
diagnostic.
Conditions for Setting the DTC

None of the following was set: EGR DTCs, HO2S
DTCs, (response, transition, open, low volts, no
activity), MAF DTCs, TPS DTCs, MAP DTCs, IATDTCs, canister purge DTCs, EVAP DTCs, injector
circuit DTCs, or misfire DTCs.

Engine coolant temperature is between 6
C (42.8
F)
and 105
C (221
F).

Intake air temperature is between ±40
C (±40
F) and
120
C (248
F).

Manifold absolute pressure is between 24 kPa and 99
kPa.

Throttle angle is steady below 95%.

Vehicle speed is below 136 km/h (85 mph).

Engine speed is between 400 and 6,000 RPM.

Barometric pressure is greater than 72.5 kPa.

Mass air flow is between 2 g/second and 200 g/second.

Ignition voltage is above 9.5 volts.

Fuel system is in ªclosed loopº.

Canister purge duty cycle is greater than 0%, if ªONº.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
fault is detected.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

6E±230
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0174 Fuel Trim System Lean Bank 2
060R200054
Circuit Description
To provide the best possible combination of driveability,
fuel economy, and emission control, a ªclosed loopº
air/fuel metering system is used. While in ªclosed loopº,
the powertrain control module (PCM) monitors the Bank 1
HO2S 1 and Bank 2 HO2S 1 signals and adjusts fuel
delivery based upon the HO2S signal voltages. A change
made to fuel delivery will be indicated by the long and
short term fuel trim values which can be monitored with a
Tech 2. Ideal fuel trim values are around 0%; if the HO2S
signals are indicating a lean condition the PCM will add
fuel, resulting in fuel trim values above 0%. If a rich
condition is detected, the fuel trim values will be below
0%, indicating that the PCM is reducing the amount of fuel
delivered. If an excessively lean condition is detected on
Bank 2, the PCM will set DTC P0174.
The PCM's maximum authority to control long term fuel
trim allows a range between ±15%(automatic
transmission) or ±12%(manual transmission) and +20%.
The PCM monitors fuel trim under various engine
speed/load fuel trim cells before determining the status of
the fuel trim diagnostic.
Conditions for Setting the DTC

None of the following DTCs are set: idle system, EGR,
HO2S, (response, transition, open, low volts, no
activity), MAF, TP sensor, MAP, IAT, canister purge,
EVAP, injector circuit, or misfire.

Engine coolant temperature is between 6
C (42.8
F)
and 105
C (221
F).
Intake air temperature is between ±40
C (±40
F) and
120
C (248
F).

Manifold absolute pressure is between 24 kPa and 99
kPa.

Throttle angle is steady between 3 and 95%.

Vehicle speed is below 136 km/h (85 mph).

Engine speed is between 400 and 6,000 RPM.

Barometric pressure is greater than 72.5 kPa.

Mass air flow is between 2 g/second and 200 g/second.

Ignition voltage is above 9.5 volts.

Fuel system is in ªclosed loopº.

Canister purge duty cycle is greater than 0%, if ªONº.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
failure is detected.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P0174 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

DTC P0174 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.

6E±234
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0175 Fuel Trim System Rich Bank 2
060R200054
Circuit Description
To provide the best possible combination of driveability,
fuel economy, and emission control, a ªclosed loopº
air/fuel metering system is used. While in ªclosed loopº,
the powertrain control module (PCM) monitors the Bank 1
HO2S 1 and Bank 2 HO2S 1 signals and adjusts fuel
delivery based upon the HO2S signal voltages. A change
made to fuel delivery will be indicated by the long and
short term fuel trim values which can be monitored with a
Tech 2. Ideal fuel trim values are around 0%; if the HO2S
signals are indicating a lean condition the PCM will add
fuel, resulting in fuel trim values above 0%. If a rich
condition is detected, the fuel trim values will be below
0%, indicating that the PCM is reducing the amount of fuel
delivered. If an excessively rich condition is detected on
Bank 2, the PCM will set DTC P0175.
The PCM's maximum authority to control long term fuel
trim allows a range between ±15%(automatic
transmission) or ±12%(manual transmission) and +20%.
The PCM's maximum authority to control short term fuel
trim allows a range between ±11% and +20%. The PCM
monitors fuel trim under various engine speed/load fuel
trim cells before determining the status of the fuel trim
diagnostic.
Conditions for Setting the DTC

None of the following DTCs are set: idle system, EGR,
HO2S, (response, transition, open, low volts, noactivity), MAF, TPS, MAP, IAT, canister purge, EVAP,
injector circuit, or misfire.

Engine coolant temperature is between 6
C (42.8
F)
and 105
C (221
F).

Intake air temperature is between ±40
C (±40
F) and
120
C (248
F).

Manifold absolute pressure is between 24 kPa and 99
kPa.

Throttle angle is steady between 3 and 95%.

Vehicle speed is below 136 km/h (85 mph).

Engine speed is between 400 and 6,000 RPM.

Barometric pressure is greater than 72.5 kPa.

Mass air flow is between 2 g/second and 200 g/second.

Ignition voltage is above 9.5 volts.

Fuel system is in ªclosed loopº.
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after the second consecutive trip in which the
failure is detected.

The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC

The PCM will turn the MIL ªOFFº on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

6E±259
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0300 ± Engine Misfire Detected

 
StepNo Ye s Value(s) Action
171. Perform the ªInjector Coil/Balance Testº.
2. If a problem is found, replace faulty injector(s) as
necessary.
Did any of the injectors require replacement?
ÐVerify repairGo to Step 18
181. Check for an engine mechanical problem. Refer to
Engine Mechanical Diagnosis to diagnose the
following conditions:

A faulty or incorrect camshaft

Leaking or sticky valves or rings

Excessive valve deposits

Weak valve springs

Incorrect valve timing

A leaking head gasket

A loose or broken motor mount
2. If a problem is found, repair as necessary.
Was a basic engine mechanical problem found and
repaired?
ÐVerify repairGo to Step 19
191. Check for a transmission TCC problem. Refer to
4L30-E Automatic Transmission Diagnosis.
2. If a problem is found, repair the transmission as
necessary. Refer to
4L30-E Automatic
Transmission Unit Repair
.
Was a transmission problem found and repaired?
ÐVerify repair Go to Step 20
20Replace the MAF sensor.
Is the action complete?
ÐVerify repairÐ

6E±299
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0401 EGR Flow Insufficient
060R200050
Circuit Description
The powertrain control module (PCM) tests the exhaust
gas recirculation (EGR) system during deceleration by
momentarily commanding the EGR valve to open while
monitoring the manifold absolute pressure (MAP) sensor
signal. When the EGR valve is opened, the PCM
monitors the change in MAP input signal. The PCM
compares the MAP change to a RPM vs. BARO table.
When the PCM interprets the change in MAP to be out of
limits, the PCM will set DTC P0401. The number of test
samples required to accomplish this may vary according
to the severity of the detected flow error.
Normally, the PCM will only allow one EGR flow test
sample to be taken during an ignition cycle. To aid in
verifying a repair, the PCM allows twelve test samples
during the first ignition cycle following a Tech 2 ªClear Infoº
or a battery disconnect. Between nine and twelve
samples should be sufficient for the PCM to determine
adequate EGR flow and pass the EGR test.
Conditions for Setting the DTC

No TP sensor, vehicle speed sensor (VSS), MAP
sensor, IAT sensor, IAC, EGR Pintle Position sensor,
ECT sensor, misfire, or automatic transmission DTCs
set.

Engine coolant temperature is greater than 60
C
(140
F).

Ignition voltage between 11.5 and 16 volts.

Vehicle speed is greater than 24 km/h (15 mph).
A/C clutch status is unchanged.

TCC status is unchanged.
Start Test

TP angle is less than 0.8%.

EGR duty cycle is less than 1%.

MAP is steady, changing less than 2 kPa.

Engine speed is between 1100 RPM and 2000 RPM
(M/T).

MAP between 10 kPa and 40 kPa.

Engine speed is between 900 RPM and 1500 rpm
(A/T).
The test will be aborted if the vehicle speed changes
by more than 16 km/h (10 mph), engine speed
changes by more than 100 RPM or the EGR is
opened less than 95% of commanded position.

The PCM will only run the EGR test during a closed
throttle condition.

The PCM will only run the EGR test at vehicle speeds
above 24 km/h (15 mph).

Several deceleration cycles will be necessary to run a
sufficient number of EGR flow tests.
Action Taken When the DTC Sets

The PCM will ON the MIL after second trip with
detected fault.