2002 ISUZU AXIOM ECO mode

6E±368
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0566 Cruise Cancel Switch Circuit Error
060R100094
Circuit Description
The cruise control keeps the vehicle running at a fixed
speed until a signal canceling this fixed speed is received.
When the main switch is turned on with the vehicle in the
running mode, the battery voltage is applied to powertrain
control module(PCM). When a signal from the control
switch is input to PCM while the vehicle is in this state, the
cruise control system is activated. Also, while the PCM is
operating, the ªCRUISE MAINº indicator light in the meter
assembly lights up.
When the cancel switch is ªONº, cruise system is ªOFFº.
Conditions for setting the DTC

The Ignition is ªONº.

Engine is running.

System voltage is between 11.5 volts and 16 volts.

The switch contact remains on for 40 seconds or more.
Noises are generated by poor switch contact 100 times
within 1.6 seconds.
Action Taken When the DTC Sets

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

The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.
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 P0566 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

6E±370
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0567 Cruise Resume Switch Circuit Error
060R200086
Circuit Description
The cruise control keeps the vehicle running at a fixed
speed until a signal canceling this fixed speed is received.
When the main switch is turned on with the vehicle in the
running mode, the battery voltage is applied to powertrain
control module(PCM). When a signal from the control
switch is input to PCM while the vehicle is in this state, the
cruise control system is activated. Also, while the PCM is
operating, the ªCRUISE MAINº indicator light in the meter
assembly lights up.
When the resume switch is ªONº, vehicle speed is reset to
the previous set speed.
Conditions for setting the DTC

The Ignition is ªONº.

Engine is running.

System voltage is between 11.5 volts and 16 volts.

The switch contact remain on for 50 seconds or more.
Noises are generated by poor switch contact 100 times
within 1.6 seconds.
Action Taken When the DTC Sets

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

The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.
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 P0567 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

DTC P0567 can be cleared using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.

6E±372
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P0568 Cruise Set Switch Circuit Error
060R200086
Circuit Description
The cruise control keeps the vehicle running at a fixed
speed until a signal canceling this fixed speed is received.
When the main switch is turned on with the vehicle in the
running mode, the battery voltage is applied to powertrain
control module (PCM). When a signal from the control
switch is input to PCM while the vehicle is in this state, the
cruise control system is activated. Also, while the PCM is
operating, the ªCRUISE MAINº indicator light in the meter
assembly lights up.
When the set switch is ªONº, vehicle speed is set.
Conditions for setting the DTC

The Ignition is ªONº.

Engine is running.

System voltage is between 11.5 volts and 16 volts.

The switch contact remain on for 120 seconds or more.
Noises are generated by poor switch contact 100 times
within 1.6 seconds.
Action Taken When the DTC Sets

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

The PCM will store conditions which were present
when the DTC was set in the Failure Records data only.
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 P0568 will clear after 40 consecutive trip
cycles during which the warm up cycles have occurred
without a fault.

6E±401
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1125 ETC (Electric Throttle Control) Limit Performance Mode
060R200064
Circuit Description

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

The Ignition is ª ONº.

Limit Performance 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 P1125 will clear after 40 consecutive trip
cycle during which the warm up cycles have occurred
without a fault.

DTC P1125 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.

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.