ECO mode ISUZU AXIOM 2002 Service Manual PDF

6E±402
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Rubbed through wire insulation.

Broken wire inside the insulation.
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.

Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
AP sensor 1, AP sensor 2, AP sensor 3 display on the
Tech 2 while moving connectors and wiring harnesses
related to the sensor.A change in the display will indicate the location of
the fault.
If DTC P1125 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 P1125 Diagnostic Chart may
isolate the cause of the fault.
DTC P1125 ± ETC Limit Performance Model

StepActionValue(s)Ye sNo
1Was the ªOn-Board (OBD) System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
2Was the ªElectric Throttle Control (ETC) System
Checkº performed?
ÐGo to Step 3
Go to ETC
System
Check
3Observe the AP angle reading on the Tech 2 while
slowly opening the throttle.
Does the AP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?Idle position
AP sensor 1
=13 % AP
sensor 2, 3
=85 ~ 89 %
open throttle
AP sensor 1
=85 ~ 89 %
AP sensor 2
=11 ~ 15 %
Refer to
Diagnostic
Aids
Go to Step 4
41. Disconnect the AP sensor.
2. Observe the AP sensor reading on the Tech 2.
Is the AP sensor reading near the specified value?
0VGo to Step 5Go to Step 6
51. Connect a test light between the 5 Voltage supply
circuit and the AP1, AP2 AND AP3 sensor signal
circuit at the AP sensor harness connector.
2. Observe the AP sensor reading on the Tech 2.
Is the AP sensor reading near the specified value?
5VGo to Step 7Go to Step 8
6Check the following items;
1. AP1, AP2 or AP3 signal circuit for a short to voltage.
2. AP1, AP2 or AP3 sensor ground circuit for high
resistance between the PCM and the AP sensor.
3. AP1, AP2 or AP3 sensor ground circuit for a poor
connection.
4. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
ÐVerify repairGo to Step 9

6E±420
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1167 Fuel System Rich During Decel Fuel Cut Off (Bank 1)
060R200054
Circuit Description
The powertrain control module (PCM) continuously
monitors the heated oxygen sensor (HO2S) activity for 90
seconds after ªclosed loopº has been enabled. During the
monitoring period the powertrain control module (PCM)
counts the number of times a rich to lean response is
indicated and adds the amount of time it look to complete
all rich to lean transitions and lean to rich transitions.
This code detects if Bank1 O2 sensor indicated rich
exhaust while in Decel Fuel Cut Off (DFCO) for fuel
control sensors.
Conditions for setting the DTC

No related DTCs.

The engine coolant temperature is more than 60
C
(140
F).

Engine is operating in ªclosed loopº power enrichment
mode for 3 seconds.

While in ªpower enrichmentº mode the oxygen sensor
voltage remains more than 600mV in DFCO.
Action Taken When the DTC Sets

The PCM will not illuminate the malfunction
malfunction indicator lamp (MIL).

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC

A history DTC P1167 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1167 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids

Check for faulty fuel injectors and fuel pump.

6E±422
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1169 Fuel System Rich During Decel Fuel Cut Off (Bank 2)
060R200054
Circuit Description
The powertrain control module(PCM)
continuously monitors the heated oxygen sensor (HO2S)
activity for 90 seconds after ªclosed loopº has been
enabled. During the monitoring period the powertrain
control module (PCM) counts the number of times a rich
to lean response is indicated and adds the amount of time
it look to complete all rich to lean transitions and lean to
rich transitions.
This code detects if Bank2 sensor indicated rich exhaust
while in Decel Fuel Cut Off (DFCO) for fuel control
sensors.
Conditions for setting the DTC

No related DTCs.

The engine coolant temperature is more than 60
C
(140
F).

Engine is operating in ªclosed loopº power enrichment
mode for 3 seconds.

While in ªpower enrichmentº mode the oxygen sensor
voltage remains more than 600mV in DFCO.
Action Taken When the DTC Sets

The PCM will not illuminate the malfunction
malfunction indicator lamp(MIL).

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC

A history DTC P1169 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1169 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids

Check for faulty fuel injectors and fuel pump.

Check the pressure regulator.

6E±424
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1171 Fuel System Lean During Acceleration
060R200054
Circuit Description
The powertrain control module (PCM) internal circuitry
can identify if the vehicle fuel system is capable of
supplying adequate amounts of fuel during heavy
acceleration (power enrichment). The PCM monitors the
voltage of the oxygen sensor during power enrichment.
When a power enrichment mode of operation is
requested during ªclosed loopº operation (by heavy
acceleration), the PCM will provide more fuel to the
engine. Under these conditions the PCM should detect a
ªrichº condition (high oxygen sensor voltage). If this ªrichº
exhaust is not detected at this time, a DTC P1171 will set.
A plugged fuel filter, restricted fuel line, restricted in-tank
filter or defective fuel pump can prevent adequate
amounts of fuel from being supplied during power
enrichment mode.
Conditions for Setting the DTC

No related DTCs.

Engine is operating in ªclosed loop power enrichmentº
mode for 3 seconds.

Engine coolant temperature is above 60
C (140
F).

While in ªpower enrichmentº mode the oxygen sensor
voltage remains below 400 mV for 3 seconds.
Action Taken When the DTC Sets

The PCM will not turn the malfunction indicator lamp
(MIL) ªONº.

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame 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 P1171 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

DTC P1171 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids

A restricted fuel filter or fuel line, restricted in-tank filter,
or a defective fuel pump may supply adequate
amounts of fuel at idle, but may not be able to supply
enough fuel during heavy acceleration.

Water or alcohol in the fuel may cause low HO2S
voltage during acceleration.

Check for faulty or plugged fuel injector(s).

Check for low fuel.

6E±448
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1290 ETC Forced Idle Mode
060R200069
Circuit Description

The accelerator position (AP) sensor circuit provides a
voltage signal relative to accelerator pedal angle.
The accelerator pedal angle (AP1) will vary from
about 13 % at idle position to about 87 % at wide
open throttle (WOT).
This code detects that if the system is in Forced Idle
Mode. (Fail safe Mode)
Conditions for setting the DTC

The Ignition is ªONº.

Forced Idle Mode is active. (Fail safe Mode)
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time 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 P1290 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.
DTC P1290 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.

Mis routed harness.

Rubbed through wire insulation.

Broken wire inside the insulation.
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.

Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
AP sensor 1, AP sensor 2, AP sensor 3 display on the
Tech 2 while moving connectors and wiring harnesses
related to the sensor.
A change in the display will indicate the location of
the fault. If DTC P1290 cannot be duplicated, the
information included in the Failure Records data can
be useful in determining vehicle mileage since the
DTC was last set.
If it is determined that the DTC occurs intermittently,
performing the DTC
P1290 Diagnostic Chart may isolate the cause of the
fault.

6E±451
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1295 ETC Power Management Mode
D06RY00111
Circuit Description

The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle position (blade angle).
The throttle blade angle will vary from about 8 % at
closed throttle to about 92 % at wide open throttle
(WOT).

The DC motor circuit provides a voltage signal relative
to command throttle position (blade angle).

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 accelerator 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.

This DTC detects that if the system is in Power
Management Mode.(Fail safe Mode)
Conditions for setting the DTC

The ignition is ªONº.

Power Management Mode is active. (Fail safe Mode)
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

The PCM calculates an air flow value based on throttle
blade 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 P1295 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1295 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.
Check for the following conditions:

Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken

6E±452
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
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
TP sensor 1, TP sensor 2 display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P1295 cannot be duplicated, theinformation included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.
If it is determining that the DTC occurs intermittently,
performing the DTC
P1295 Diagnostic Chart may isolate the cause of the
fault.
DTC P1295 - ETC Power Management Mode

StepActionValue(s)Ye sNo
1Was the ªOn-Board (OBD) System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
2Was the ªElectric Throttle Control (ETC) System
Checkº performed?
ÐGo to Step 3
Go to ETC
System
Check
31. Ignition ªONº, engine ªOFFº.
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor ªDTCº info for DTC P1295.
Does the Tech 2 indicate DTC P1295 failed this
ignition?
ÐGo to Step 4
Refer to
Diagnostic
Aids
4Observe the TP angle reading on the Tech 2 while
slowly opening the throttle.
Does the TP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?Closed
throttle TP
sensor 1 =8 ~
10 % TP
sensor 2 =90
~ 92 % Wide
open throttle
TP sensor 1
=90 ~ 92 %
TP sensor 2
=8 ~ 10 %
Go to Step 9Go to Step 5
51. Ignition ªOFFº.
2. Disconnect the DC motor.
Is the DC motor reading near the specified value?
0.3 ~ 100
Go to Step 6Go to Step 8
6Check the DC motor harness between the PCM and
DC Motor circuit at the DC motor harness connector.
Was a problem found?
ÐVerify repairGo to Step 7
7Check the throttle valve assembly.
Was a problem found?
Verify repairGo to Step 8
8Replace the DC motor. (Replace the Throttle valve
assembly)
Is the action complete?
ÐVerify repairÐ
91. Disconnect the TP sensor.
2. Observe the TP sensor reading on the Tech 2.
Is the TP sensor reading near the specified value?
0VGo to Step 10Go to Step 11

6E±453
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P1295 - ETC Power Management Mode

 
StepNo Ye s Value(s) Action
101. Connect a test light between the 5Volt reference ªAº
circuit and the TP1 and TP2 sensor signal circuit at
the TP sensor harness connector.
2. Observe the TP sensor reading on the Tech 2.
Is the TP sensor reading near the specified value?
5VGo to Step 13Go to Step 12
11Check the following items;
1. TP1 and TP2 signal circuit for a short to voltage.
2. TP1 and TP2 sensor ground circuit for high
resistance between the PCM and the TP sensor.
3. TP1and TP2 sensor ground circuit for a poor
connection.
4. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
ÐVerify repairGo to Step 14
12Check the following items;
1. TP1and TP2 signal circuit or 5 volt reference circuit
for a poor connection.
2. TP1 and TP2 signal circuit or 5 volt reference circuit
for high resistance between the PCM and the
TP1and TP2 sensor.
3. If a problem is found, repair wiring harness as
necessary.
Was a problem found?
ÐVerify repairGo to Step 14
13Replace the TP sensor.
Is the action complete?
ÐVerify repairÐ
141. Start the engine.
2. With the engine idling, monitor ªMAF Frequencyº
display on the Tech 2.
Is the ªMAF Frequencyº below the specified value?
6 ~ 10 g/sGo to Step 15Go to Step 18
151. Ignition ªOFFº.
2. Disconnect the MAF sensor connector.
3. Ignition ªONº, engine idling.
4. Using a Tech 2, monitor ªMAF Frequencyº.
Does the Tech 2 indicate a ªMAF Frequencyº at the
specified value?
0g/sGo to Step 16Go to Step 17
16Replace the MAF sensor.
Is the action complete?
ÐVerify repairÐ
171. Check the MAF harness for incorrect routing near
high voltage components (solenoids, relays,
motors).
2. If incorrect routing is found, correct the harness
routing.
Was a problem found?
ÐVerify repairGo to Step 23
181. With the engine idling, monitor ªMAF Frequencyº
display on the Tech 2.
2. Quickly snap open throttle to wide open throttle
while under a road load and record value.
Does the Tech 2 indicate a ªMAF Frequencyº at the
specified value?
6 ~ 10 g/sGo to Step 16Go to Step 19

6E±455
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1299 ETC Forced Engine Shutdown Mode
060R200061
Circuit Description

The throttle position sensor circuit provides a voltage
signal relative to throttle position (blade angle).
The throttle blade angle will vary from about 8% at
closed throttle to about 92% at wide open
throttle(WOT).

The DC motor circuit provides a voltage signal relative
to command throttle position (blade angle).

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
accelerator 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.

This DTC detects if the system is in ETC Forced
Engine Shutdown Mode.(Fail safe Mode)
Conditions for setting the DTC

The ignition is ªONº.

ETC Forced Engine Shutdown Mode is active. (Fail
safe Mode)
Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.

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 P1299 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P1299 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.
Check for the following conditions:

Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken

6E±456
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
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
TP sensor 1, TP sensor 2 display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P1299 cannot be duplicated, theinformation included in the Failure Records data can
be useful in determined vehicle mileage since the
DTC was last set.
If it is determining that the DTC occurs intermittently,
performing the DTC P1299 Diagnostic Chart may
isolate the cause of the fault.
DTC P1299 - ETC Forced Engine Shutdown Mode

StepActionValue(s)Ye sNo
1Was the ªOn-Board (OBD) System Checkº performed?
ÐGo to Step 2
Go to OBD
System
Check
2Was the ªElectric Throttle Control (ETC) System
Checkº performed?
ÐGo to Step 3
Go to ETC
System
Check
3Observe the TP angle reading on the Tech 2 while
slowly opening the throttle.
Does the TP angle increase steadily and evenly from
the closed throttle value to the wide open throttle
value?Closed
throttle TP
sensor 1 =8 ~
10 % TP
sensor 2 =90
~ 92 % Wide
open throttle
TP sensor 1
=90 ~ 92 %
TP sensor 2
=8 ~ 10 %
Go to Step 8Go to Step 4
41. Ignition ªOFFº.
2. Disconnect the DC motor.
Is the DC motor reading near the specified value?
0.3 ~ 100
Go to Step 5Go to Step 7
5Check the DC motor harness between the PCM and
DC Motor circuit at the DC motor harness connector.
Was a problem found?
ÐVerify repairGo to Step 6
6Check the throttle valve assembly.
Was a problem found?
Verify repairGo to Step 7
7Replace the DC motor. (Replace the Throttle valve
assembly)
Is the action complete?
ÐVerify repairGo to Step 8
81. Disconnect the TP sensor.
2. Observe the TP sensor reading on the Tech 2.
Is the TP sensor reading near the specified value?
0VGo to Step 9Go to Step 10
91. Connect a test light between the 5 Volt reference
circuit and the TP1 and TP2 sensor signal circuit at
the TP sensor harness connector.
2. Observe the TP sensor reading on the Tech 2.
Is the TP sensor reading near the specified value?
5VGo to Step 12Go to Step 11