2002 ISUZU AXIOM Service Repair Manual

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Page 1265 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±298
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0356 ± Ignition 6 Control Circuit
StepNo Ye s Value(s) Action
11Check for an open ignition control circuit 6.
Was the ignition contr

Page 1266 of 2100

ISUZU AXIOM 2002 Service Repair Manual 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 r

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 60C
(140F).
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.

Page 1267 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±300
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Diagnostic Aids
Check for th

Page 1268 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±301
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0401 ± EGR Flow Insufficient
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD

Page 1269 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±302
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0402 EGR Pintle Crank Error
060R200050
Circuit Description
The powertrain control module (PCM) monitors the EGR
valve

6E±302
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0402 EGR Pintle Crank Error
060R200050
Circuit Description
The powertrain control module (PCM) monitors the EGR
valve pintle position input to ensure that the valve
responds properly to commands from the PCM, and to
detect a fault if pintle position is stuck open. If the PCM
detects a pintle position signal indicates more than 21.5%
and more than for 625 msec during cranking, the PCM will
set DTC P0402.
Conditions for Setting the DTC
Ignition voltage is between 11 and 16 volts.
At Engine revolution less than 600 RPM, EGR pintle
position indicates more than 21.0% and more than for
625 msecs.
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 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 P0402 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0402 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:
Foreign material on EGR valve between pintle and
seat may cause EGR stuck open. Inspect foreign
material in EGR valve.
Excessive carbon deposit may cause unsmooth
operation of EGR valve shaft. Inspect for carbon
deposit and clean up inside of carbon deposit.
Poor connection or damaged harness±inspect the
wiring harness for damage If the harness appears to be
OK, observe the EGR actual position display on the
Tech 2 while moving connectors and wiring harnesses
related to EGR valve. A change in the display will
indicate the location of the fault.
NOTE: If the EGR valve shows signs of excessive heat,
check the exhaust system for blockage (possibly a
plugged catalytic converter) using the ªRestricted
Exhaust System Checkº.

Page 1270 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±303
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0402 ± EGR Pintle Crank Open Error
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go

Page 1271 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±304
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0404 EGR Open Stuck
060R200050
Circuit Description
The powertrain control module (PCM) monitors the EGR
valve pintle

6E±304
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0404 EGR Open Stuck
060R200050
Circuit Description
The powertrain control module (PCM) monitors the EGR
valve pintle position input to ensure that the valve
responds properly to commands from the PCM, and to
detect a fault if pintle position is different from
commanded position. If the PCM detects a pintle position
signal indicates more than 15 points different between
current and commanded and more than 15 seconds, the
PCM will set DTC P0404.
Conditions for Setting the DTC
The engine is running.
Ignition voltage is between 11 and 16 volts.
Intake Air Temp is more than 3C (37.4F).
Desire EGR position is less than 3%.
The difference between desired EGR and current EGR
is less than 3%.
Difference EGR pintle position between current and
commanded position becomes more than 15% and
last more than 15 seconds, and this condition meets
three times in a trip. Then it trigger, the PCM lights on.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected the fault.The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in 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 P0404 will clear after 40 consecutive
warm-up cycles have occurred without a fault.
DTC P0404 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:
Excessive carbon deposit on EGR valve shaft may
cause EGR stuck open or unsmooth operation. Those
carbon deposit may occur by unusual port operation.
Clean up carbon may make smooth function of EGR
valve.
Poor connection or damaged harness ± Inspect the
wiring harness for damage. If the harness appears to
be OK, observe the EGR actual position display on the
Tech 2 while moving connectors and wiring harnesses
related to EGR valve. A change in the display will
indicate the location of the fault.

Page 1272 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±305
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0404 ± EGR Open Stuck
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
Syste

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