check engine ISUZU AXIOM 2002 Service Repair Manual

6E±125
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Evaporative (EVAP) Emissions Canister Purge Valve Check

StepActionValue(s)Ye sNo
11. Ignition ªOFFº.
2. Ignition ªONº, engine ªOFFº.
3. At the throttle body, disconnect the hose that goes
to the purge solenoid.
4. Using a hand vacuum pump with an attached
vacuum gauge J 23738-A, apply vacuum (10 in. Hg
or 34 kPa) to the solenoid.
Does the solenoid hold the vacuum?
ÐGo to Step 3Go to Step 2
21. Disconnect the solenoid electrical connector.
2. As in Step 1, apply vacuum (10 in. Hg or 34 kPa) to
the solenoid.
Does the solenoid hold the vacuum?
ÐGo to Step 4Go to Step 7
31. At the throttle body, put a cap over the vacuum port
where the hose was disconnected for testing. This
is to prevent a vacuum leak when the engine is
started.
2. Ignition ªOFFº.
3. Install the Tech 2.
4. Apply vacuum to the purge solenoid with the hand
vacuum pump.
5. Start the engine, run at 2500 RPM.
6. Using the Tech 2, select Powertrain, 3.5±V6 6VE1,
F3: Misc. Tests, F2: EVAP Purge, F0: EVAP Purge.
(Refer to the Misellaneous Test.)
7. Turn the purge solenoid ªONº.
Did the vacuum drop when the purge was turned on?
ÐGo to Step 8Go to Step 9
4Check for a short to ground in the S7 Pin wire.
Is there a short?
ÐGo to Step 5Go to Step 6
5Repair the short to ground.
Is the action complete?
ÐVerify repairÐ
6Replace the PCM.
IMPORTANT:The replacement PCM must be
programmed. Refer to
On-Vehicle Servicein
Powertrain Control Module and Sensors for
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
ÐVerify repairÐ
7Replace the faulty purge solenoid. Refer to On-Vehicle
Service, EVAP Canister Purge Solenoid.
Is the action complete?ÐVerify repairÐ

6E±126
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Evaporative (EVAP) Emissions Canister Purge Valve Check

 
StepNo Ye s Value(s) Action
81. Turn the ignition ªOFFº.
2. At the throttle body, install a vacuum gauge where
the hose from the purge solenoid was disconnected
for testing.
3. Start the engine.
4. Stabilize the engine speed at about 2500 RPM.
5. Momentarily snap the throttle open and let it return
to idle.
Is there approximately 10 in. Hg (34 kPa) of vacuum
available at the EVAP emission canister purge
solenoid?
Ð
No problem
found in the
EVAP
emission
canister
purge valve
check
Refer to
Diagnostic
Aids
91. Disconnect the solenoid electrical connector.
2. Connect a test lamp between the harness
terminals.
Does the test lamp light?
ÐGo to Step 7Go to Step 10
10Probe terminal A and terminal B with a test lamp to
ground.
Does the test lamp light on both terminals?
ÐGo to Step 11Go to Step 12
11Repair the short to voltage in the S7 Pin wire.
Is the action complete?
ÐVerify repairÐ
12Does one of the terminals light the test lamp?ÐGo to Step 13Go to Step 14
13Check for an open in the S7 Pin wire between the purge
solenoid and the PCM.
Was there an open circuit?
ÐGo to Step 15Go to Step 6
14Repair the open in the BLK/YEL wire.
Is the action complete?
ÐVerify repairÐ
15Repair the open in the S7 Pin wire.
Is the action complete?
ÐVerify repairÐ

6E±127
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
PCM Diagnostic Trouble Codes
The following table lists the diagnostic trouble codes
supported by this vehicle application. If any DTCs not
listed here are displayed by a Tech 2, the Tech 2 data may
be faulty; notify the Tech 2 manufacturer of any DTCs
displayed that are not included in the following table.
PCM Diagnostic Trouble Codes
DTC
DescriptionTypeIlluminate
MIL
(Check
Engine
Lamp)Illuminate
RPL
(Reduced
Power
Lamp)
P0101MAF System PerformanceBYe sNo
P0102MAF Sensor Circuit Low FrequencyBYe sNo
P0103MAF Sensor Circuit High FrequencyBYe sNo
P0106MAP Rationality/PerformanceBYe sNo
P0107MAP Circuit Low Input VoltageBYe sNo
P0108MAP Circuit High Input VoltageBYe sNo
P0112IAT Circuit Low Input VoltageBYe sNo
P0113IAT Circuit High Input VoltageBYe sNo
P0117ECT Circuit Low Input VoltageBYe sNo
P0118ECT Circuit High Input VoltageBYe sNo
P0125ECT Insufficient for Closed Loop Fuel ControlBYe sNo
P0128ECT Below Thermostat Regulating TemperatureBYe sNo
P0131O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)BYe sNo
P0132O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)BYe sNo
P0133O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)BYe sNo
P0134O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)BYe sNo
P0135O2 Sensor Heater Circuit (Bank 1 Sensor 1)BYe sNo
P0137O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)BYe sNo
P0138O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)BYe sNo
P0140O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)BYe sNo
P0141O2 Sensor Heater Circuit (Bank 1 Sensor 2)BYe sNo
P0151O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)BYe sNo
P0152O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)BYe sNo
P0153O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)BYe sNo
P0154O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)BYe sNo
P0155O2 Sensor Heater Circuit (Bank 2 Sensor 1)BYe sNo
P0157O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)BYe sNo
P0158O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)BYe sNo
P0160O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)BYe sNo
P0161O2 Sensor Heater Circuit (Bank 2 Sensor 2)BYe sNo
P0171O2 Sensor ± System too Lean (Bank 1)BYe sNo
P0172O2 Sensor ± System too Rich (Bank 1)BYe sNo
P0174O2 Sensor ± System too Lean (Bank 2)BYe sNo
P0175O2 Sensor ± System too Rich (Bank 2)BYe sNo

6E±128
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTCIlluminate
RPL
(Reduced
Power
Lamp) Illuminate
MIL
(Check
Engine
Lamp) Type Description
P0201Injector 1 Control CircuitAYe sNo
P0202Injector 2 Control CircuitAYe sNo
P0203Injector 3 Control CircuitAYe sNo
P0204Injector 4 Control CircuitAYe sNo
P0205Injector 5 Control CircuitAYe sNo
P0206Injector 6 Control CircuitAYe sNo
P0300Engine Misfire DetectedBYe sNo
P0301Engine Misfire Detected Cylinder #1BYe sNo
P0302Engine Misfire Detected Cylinder #2BYe sNo
P0303Engine Misfire Detected Cylinder #3BYe sNo
P0304Engine Misfire Detected Cylinder #4BYe sNo
P0305Engine Misfire Detected Cylinder #5BYe sNo
P0306Engine Misfire Detected Cylinder #6BYe sNo
P0325ION Sensing ModuleBYe sNo
P0336CKP Sensor Circuit Range/Performance (58X)BYe sNo
P0337CKP Sensor Circuit No signal (58X)BYe sNo
P0351Ignition 1 Control CircuitAYe sNo
P0352Ignition 2 Control CircuitAYe sNo
P0353Ignition 3 Control CircuitAYe sNo
P0354Ignition 4 Control CircuitAYe sNo
P0355Ignition 5 Control CircuitAYe sNo
P0356Ignition 6 Control CircuitAYe sNo
P0401EGR Flow InsufficientBYe sNo
P0402EGR Flow ExcessiveBYe sNo
P0404EGR Range/Performance (Open Valve)BYe sNo
P0405EGR Sensor Circuit Low VoltageBYe sNo
P0406EGR Sensor Circuit High VoltageBYe sNo
P0420Catalyst System Low Efficiency (Bank 1)AYe sNo
P0430Catalyst System Low Efficiency (Bank 2)AYe sNo
P0440EVAP Control SystemBYe sNo
P0442EVAP Control System Small Leak DetectedBYe sNo
P0444EVAP Purge Control Circuit OpenDNoNo
P0445EVAP Purge Control Circuit ShortDNoNo
P0446EVAP Canister Vent Control MalfunctionBYe sNo
P0447EVAP Vent Solenoid Circuit OpenDNoNo
P0448EVAP Vent Solenoid Circuit ShortDNoNo
P0452EVAP Control System Tank Pressure Sensor Low InputBYe sNo
P0453EVAP Control System Tank Pressure Sensor High InputBYe sNo
P0456EVAP Control System Very Small Leak DetectedBYe sNo
P0461Fuel Level Sensor Circuit Range/PerformanceDNoNo

6E±129
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTCIlluminate
RPL
(Reduced
Power
Lamp) Illuminate
MIL
(Check
Engine
Lamp) Type Description
P0462Fuel Level Sensor Circuit Low Input VoltageBYe sNo
P0463Fuel Level Sensor Circuit High Input VoltageBYe sNo
P0464Fuel Level Sensor Noisy SignalDNoNo
P0502No VSS SignalBYe sNo
P0506Idle Speed Control RPM too LowBYe sNo
P0507Idle Speed Control RPM too HighBYe sNo
P0562System Voltage is LowDNoNo
P0563System Voltage is HighBYe sNo
P0565Cruise Main Switch Circuit ErrorDNoNo
P0566Cruise Cancel Switch Circuit ErrorDNoNo
P0567Cruise Resume Switch Circuit ErrorDNoNo
P0568Cruise Set Switch Circuit ErrorDNoNo
P0601PCM/ECM Memory ChecksumAYe sNo
P0602PCM/ECM Programming errorDNoNo
P0604PCM/ECM RAM errorDNoNo
P0606PCM/ECM Internal PerformanceDNoNo
P1106MAP Circuit Intermittent High Voltage)DNoNo
P1107MAP Circuit Intermittent Low Input VoltageDNoNo
P 1111IAT Circuit Intermittent High VoltageDNoNo
P1112IAT Circuit Intermittent Low Input VoltageDNoNo
P1114ECT Circuit Intermittent Low VoltageDNoNo
P1115ECT Circuit Intermittent High VoltageDNoNo
P1120TPS1 CircuitBYe sNo
P1125ETC Limit Performance ModeAYe sYe s
P1133O2 Sensor ± Too Few Rich/Lean and Lean/Rich Switches (Bank
1 Sensor 1)BYe sNo
P1134O2 Sensor ± Transition Switch Time ratio (Bank 1 Sensor 1)BYe sNo
P1153O2 Sensor ± Too Few Rich/Lean and Lean/Rich Switches (Bank
2 Sensor 1)BYe sNo
P1154O2 Sensor ± Transition Switch Time ratio (Bank 2 Sensor 1)BYe sNo
P1167Fuel supply System RICH During Decel Fuel Cut Off (Bank 1)DNoNo
P1169Fuel supply System RICH During Decel Fuel Cut Off (Bank 2)DNoNo
P1171Fuel supply System Lean During Power EnrichmentDNoNo
P1220TPS2 CircuitBYe sNo
P1221TPS1±TPS2 Correlation (Circuit Performance)DNoNo
P1271APS1±APS2 Correlation (Circuit Performance)DNoNo
P1272APS2±APS3 Correlation (Circuit Performance)DNoNo
P1273APS1±APS3 Correlation (Circuit Performance)DNoNo
P1275APS1 CircuitBYe sNo
P1280APS2 CircuitBYe sNo
P1285APS3 CircuitBYe sNo

6E±130
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTCIlluminate
RPL
(Reduced
Power
Lamp) Illuminate
MIL
(Check
Engine
Lamp) Type Description
P1290ETC Forced Idle ModeAYe sYe s
P1295ETC Power Management ModeAYe sYe s
P1299ETC Forced Engine Shutdown in ModeAYe sYe s
P1310ION Sensing Module DiagnosticAYe sNo
P1311ION Sensing Module SEC 1 Line Circuit FaultAYe sNo
P1312ION Sensing Module SEC 2 Line Circuit FaultAYe sNo
P1326ION Sensing Module Combustion Quality circuitAYe sNo
P1340ION Sensing Module ± Cylinder SynchronizationBYe sNo
P1404EGR Range/Performance (Closed Valve)BYe sNo
P1441EVAP Control System Continuous Open Purge FlowBYe sNo
P1514TPS±MAF CorrelationAYe sNo
P1515Command±Acrual TPS CorrelationAYe sNo
P1516Command±Acrual TPS Correlation ErrorAYe sNo
P1523Throttle Actuator Control Return PerformanceDNoNo
P1625PCM/ECM System ResetDNoNo
P1635Reference Voltage #1 CircuitDNoNo
P1639Reference Voltage #2 CircuitDNoNo
P1640ODM Output circuit FaultDNoNo
P1650QDM Output Circuit FaultDNoNo

6E±131
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0101 MAF System Performance
060R200052
Circuit Description
The mass air flow (MAF) sensor measures the amount of
air which passes through it into the engine during a given
time. The powertrain control module (PCM) uses the
mass air flow information to monitor engine operating
conditions for fuel delivery calculations. A large quantity
of air entering the engine indicates an acceleration or high
load situation, while a small quantity or air indicates
deceleration or idle.
The MAF sensor produces a frequency signal which can
be monitored using a Tech 2. The frequency will vary
within a range of around 4 to 7g/s at idle to around 25 to
40g/s at maximum engine load. DTC P0101 will be set if
the signal from the MAF sensor does not match a
predicted value based on throttle position and engine
RPM.
Conditions for setting the DTC

The engine is running.

No TP sensor and MAP sensor DTCs are set.

No MAF frequency DTCs are set.

System voltage is between 11.5 volts and 16 volts.
Action Taken When the DTC Sets

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

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.
The PCM will store condition 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 P0101 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P0101 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:

Poor connections.

Misrouted harness.

Rubbed through wire insulation.

Broken wire inside the insulation.

The duct work at the MAF sensor for leaks.

An engine vacuum leak.

The PCV system for vacuum leaks.

An incorrect PCV valve.

The engine oil dip stick not fully seated.

The engine oil fill cap loose or missing.
Check for the following conditions:

6E±132
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.

Damaged harness- Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Mass Air Flow (MAF) display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.

Plugged intake air duct or filter element

A wide±open throttle acceleration from a stop should
cause the mass air flow displayed on a Tech 2 toincrease from about 3±6 g/s at idle to 100 g/s or greater
at the time of the 1±2 shift. If not, check for a restriction.
A change in the display will indicate the location of
the fault.
If DTC P0101 cannot be duplicated, the information
included in the Failure Records data can be useful in
determined vehicle mileage since the DTC was last
set.
If it is determined that the DTC occurs intermittently,
performing the DTC P001 Diagnostic Chart may
isolate the cause of the fault.
DTC P0101 ± MAF System Performance

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªOFFº.
2. Disconnect the Mass Air Flow (MAF) Sensor
harness connector from the MAF Sensor.
3. Place an unpowered test lamp between the 12 volt
signal circuit and the ground circuit, both at the MAF
Sensor connector.
4. Ignition ªONº, EngineªOFFº.
Did the test lamp illuminate?
ÐGo to Step 6Go to Step 3
31. Ignition ªONº, Engine ªOFFº.
2. Using a Digital Voltmeter (DVM), check the 12 volt
signal circuit for the correct voltage.
Did the DVM indicate a value within the following
range?
11.5 to 12.5
Volt
Go to Step 5Go to Step 4
41. Ignition ªOFFº.
2. Check the 12 volt signal circuit for the following
conditions:

An open circuit

A short to ground
Was the problem found?
ÐVerify repairÐ
5Check the MAF ground circuit for the following
conditions:

An open circuit

A short to voltage
Was a problem found?
ÐVerify repairÐ
61. Ignition ªOFFº.
2. Check the MAF Sensor signal circuit between the
PCM and the MAF Sensor for the following
conditions:

An open circuit

A short to ground

A short to battery voltage
Was a problem found?
ÐVerify repairGo to Step 7

6E±133
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0101 ± MAF System Performance

 
StepNo Ye s Value(s) Action
71. Connect the MAF Sensor wiring harness connector
to the MAF Sensor.
2. Connect the Tech 2 to the vehicle.
3. Place the Transmission in Park/Neutral, and fully
apply the Parking Brake.
4. Start the engine.
5. Select the Mass Air Flow (MAF) parameter on the
Tech 2.
With the engine idling, does the Tech 2 display the
following value(s)?
4 to 7 g/sGo to Step 8Go to Step 9
8Observe the Tech 2 value while increasing the engine
RPM to its upper limit.
Does the Tech 2 display the following value(s)?
25 to 40 g/sGo to Step 10Go to Step 9
9Replace the MAF Sensor.
Is the action complete?
ÐVerify repairÐ
10Replace the PCM.
IMPORTANT:The PCM must be reprogrammed. Refer
to PCM reprogramming.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Is the action complete?
ÐVerify repairÐ

6E±134
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0102 MAF Sensor Circuit Low Frequency
060R200052
Circuit Description
The mass air flow (MAF) sensor measures the amount of
air which passes through it into the engine during a given
time. The powertrain control module (PCM) uses the
mass air flow information to monitor engine operating
conditions for fuel delivery calculations. A large quantity
of air entering the engine indicates an acceleration or high
load situation, while a small quantity of air indicates
deceleration or idle.
The MAF sensor produces a frequency signal which can
be monitored using a Tech 2. The frequency will vary
within a range of around 4 to 7g/s at idle to around 25 to 40
g/s at maximum engine load. DTC P0102 will be set if the
signal from the MAF sensor is below the possible range of
a normally operating MAF sensor.
Conditions for Setting the DTC

The engine is running above 500 RPM for more than
10 seconds.

System voltage is above 11.5 volts.

MAF signal frequency is below 1.6g/s for a total of
50-percent of the last 1000 samples monitored. A
sample is taken every cylinder event.
Action Taken When the DTC Sets

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

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.
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 P0102 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

DTC P0102 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:

Poor connection at PCM ± Inspect harness connectors
for backed-out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.

Misrouted harness ± Inspect the MAF sensor harness
to ensure that it is not routed too close to high voltage
wires.

Damaged harness ± Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Tech 2 while moving connectors and wiring harnesses
related to the MAF sensor. A change in the display will
indicate the location of the fault.

Plugged intake air duct or filter element ± A wide-open
throttle acceleration from a stop should cause the
mass air flow displayed on a Tech 2 to increase from