Isuzu Trooper (2000 year). Manual - part 333

6E–461

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC)

P1340 ION Sensing Module Cylinder ID Fault (Cylinder Synchronization Fail)

D06RY00067

Circuit Description

The Power Control Module (PCM) checks the validity of
the signals used in the ION Sensing module at the
following engine opreating conditions.

This test will return a fault if the cylinder
synchronization routine has not been completed after
a predetermined number of events after crank. This
test will detect fault that will prevent the PCM from
synchronaization, such as Knock Signal (KI) -
Combustion Quality (CQ) lines being swapped,
shorted spark plugs, ION Sensing module faults, an
PCM hardware faults.

Conditions for setting the DTC

Ignition voltage is between 11volt and 16 volts.

Engine speed is between 650rpm and 6500rpm.

No ECT DTCs set.

No injector DTCs set.

No Fuel Trim DTCs set.

No Misfire DTCs set.

No system voltage DTCs set.

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 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 “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condtion is no longer present.

A history DTC P1340 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.

DTC P1340 can be cleared using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

An intermittent may be caused by the following:

Poor connectons.

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
moving connectors and wiring harnesses related to the
sensor.

6E–462

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

A change in the display will indicate the location of
the fault. If DTC P1340 cannot be duplicated, the
information included in the Faillure 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 P1340
Diagnostic Chart may isolate the cause of the
fault.

DTC P1340 - ION Sensing Module Cylinder ID Fault

(Cylinder Synchronization Fail)

Step

Action

Value(s)

Yes

Was the “On-Board (OBD) System Check” performed?

—

Go to

Step 2

Go to

OBD

System

Check

1. Ignition “ON,” engine “OFF.”
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 “ DTC” info for DTC P1340.

Does the Tech 2 indicate DTC P1340 failed
thisignition?

—

Go to

Step 3

Refer to

DiagnosticAid

1. Ignition “OFF.”
2. Disconnect the ION Sensing module.
3. Disconnect the PCM.

Is the action complete?

—

Go to

Step 4

Go to

Step 3

Check the ION Sensing module harness between the
PCM and ICSS module circuit at the QC line harness
connector.

Was a problem found?

—

Verify repair

Go to

Step 6

1. Disconnect the ignition coil.

Is the action complete?

—

Go to

Step 6

Go to

Step 5

Check the ION Sensing module harness between the
ignition coil and ION Sensing module circuit at the ION
Sensing Module harness connector.

Was a problem found?

—

Verify repair

Go to

Step 7

Check the following items;

1. Ignition coil and ignition coil circuit.
2. Ignition coil ground circuit for a poor connection.
3. If a problem is found, repair wiring harness as

necessary.

Was a problem found?

—

Verify repair

Go to

Step 8

Replace the Ignition coil.

Is the action complete?

—

Verify repair

Go to

Step 9

Check the following items;

1. ION Sensing module ground circuit for a poor

connection.

2. If a problem is found, repair wiring harness as

necessary.

Was a problem found?

—

Go to

Step 10

Go to

Step 11

6E–463

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1340 - ION Sensing Module Cylinder ID Fault

(Cylinder Synchronization Fail)

(Cont'd)

Step

Yes

Value(s)

Action

Replace the ION Sensing module.

Is the action complete?

—

Verify repair

Go to

Step 10

Replace the PCM.

IMPORTANT: IMPORTANT;
The replacement PCM must be programmed.
Refer to

ON-Vehicle Service in Power 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 replasement PCM.

Is the action complete?

—

Verify repair

—

6E–464

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1404 EGR Stuck Closed

D06RY00178

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 current pintle zero position is different from
the learned zero position. If the PCM detects a pintle
position signal indicates more than 30 % different
between current zero position and the learned zero
position for more than 5 seconds, and this condition exists
3 times during trip, then the PCM will set DTC P1404.

Conditions for Setting the DTC

Ignition voltage is between 11 and 16 volts.

Intake Air temp is more than 3

Desired EGR position is 0.

Difference of EGR pintle position between current and
the learned zero is more than 30 % for more than 5
seconds, and exists three time to the above condition
during a trip the PCM will set DTC 1404. Then it trigger
the PCM lights on.

Action Taken When the DTC Sets

The PCM will illuminate the malfunction indicator lamp
(MIL) after consecutive 2nd 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 “OFF” on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condition is no longer present.

A history DTC P1404 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

DTC P1404 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.

Diagnostic Aids

Check for the following conditions:

Excessive carbon deposit on EGR valve shaft and/or
foreign material may cause the EGR valve not to fully
seated. The carbon deposit may occur by unusual port
operation. Remove foreign material and/or excessive
carbon deposit on EGR valve shaft and may allow the
EGR valve to be fully seated.

Poor connection or damaged harness – Inspect the
wiring harness for damage.

Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.

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