Isuzu Trooper (2000 year). Service manual — part 329

6E–445

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

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, 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 P1299
Diagnostic Chart may isolate the cause of the
fault.

DTC P1299 - ETC Forced Engine Shutdown Mode

Step

Action

Value(s)

Yes

No

1

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

—

Go to

Step 2

Go to

OBD

System

Check

2

Was the “Electric Throttle Control (ETC) System
Check” performed?

—

Go to

Step 3

Go to

ETC

System

Check

3

Observe 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 8

Go to

Step 4

4

1. Ignition “OFF.”
2. Disconnect the DC motor.

Is the DC motor reading near the specified value?

0.3

∼

100

m

Go to

Step 5

Go to

Step 7

5

Check the DC motor harness between the PCM and
DC Motor circuit at the DC motor harness connector.

Was a problem found?

—

Verify repair

Go to

Step 6

6

Check the throttle valve assembly.

Was a problem found?

Verify repair

Go to

Step 7

7

Replace the DC motor. (Replace the Throttle valve
assembly)

Is the action complete?

—

Verify repair

Go to

Step 8

8

1. Disconnect the TP sensor.
2. Observe the TP sensor reading on the Tech 2.

Is the TP sensor reading near the specified value?

0V

Go to

Step 9

Go to

Step 10

9

1. Connect a test light between the 5Volt 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?

5V

Go to

Step 12

Go to

Step 11

6E–446

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1299 - ETC Forced Engine Shutdown Mode

(Cont'd)

Step

No

Yes

Value(s)

Action

10

Check 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?

—

Verify repair

Go to

Step 13

11

Check 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?

—

Verify repair

Go to

Step 13

12

Replace the TP sensor.

Is the action complete?

—

Verify repair

—

13

1. Start the engine.
2. With the engine idling, monitor “MAF Frequency”

display on the Tech 2.

Is the “MAF Frequency” below the specified value?

6

∼

10 g/s

Go to

Step 16

Go to

Step 17

14

1. Ignition “OFF.”
2. Disconnect the MAF sensor connector.
3. Ignition “ON,” engine idling.
4. Using a Tech 2, monitor “MAF Frequency.”

Does the Tech 2 indicate a “MAF Frequency” at the
specified value?

0g/s

Go to

Step 15

Go to

Step 16

15

Replace the MAF sensor.

Is the action complete?

—

Verify repair

Go to

Step 18

16

1. 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?

—

Verify repair

Go to

Step 16

17

1. With the engine idling, monitor “MAF Frequency.”

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 “MAF Frequency” at the
specified value?

6

∼

10 g/s

Go to

Step 15

Go to

Step 18

18

1. Ignition “ON”,engine not running.
2. Observe the MAP reading on the Tech 2.

Is the MAP reading less than the specified value?

65kPa

Go to

Step 19

Go to

Step 22

6E–447

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1299 - ETC Forced Engine Shutdown Mode

(Cont'd)

Step

No

Yes

Value(s)

Action

19

1. Disconnect the MAP sensor.
2. Connect a test 5 volt reference “A” circuit and the

MAP signal at the MAP sensor harness connector.

3. Observe the MAP reading on the Tech 2.

Is the MAP reading less than the specified value?(If no,
start with diagnosis chart for other sensors in the circuit
and see if 5Vreturns.)

—

Go to

Step 21

Go to

Step 20

20

1. Check the MAP signal circuit between the PCM and

MAP ground circuit.

2. If the MAP signal circuit is open or shorted ,repair it

as necessary.

Was the MAP signal circuit open or shorted?

—

Verify repair

Go to

Step 22

21

Replace the MAP sensor.

Is the action complete?

—

Verify repair

—

22

Replace the PCM.

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 replacement PCM.

Is the action complete?

—

Verify repair

—

6E–448

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1310 ION Sensing Module Diagnosis

D06RY00067

Circuit Description

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

D

The Deceleration Fuel Cut Off (DFCO) test is
performed to evaluate the Combustion Quality (CQ)
signal pulse width if it is below a predetermined value,
the value it is expected to be during DFCO conditions.
If the CQ signal pilse width is above the predetermined
threshold, the fail counter will be incremented. If the
failure counter exceeds the calibration, then the test is
conplete and a failure will be reported.

D

The Power Enrichment (PE) test is performed to
evaluate the Combustion Quality (CQ) signal pulse
width if it is below a predetermined value, the value it
is expected to be during PE conditions.

If the CQ signal pulse width is above the
predetermined threshold, the fail counter will be
incremented. If the failure counter exceeds the
calibration, then the test is complete and a failure
will be reported.

D

The Combustion Quality (CQ) test is performed to
check if inappropriate (CQ) signal status were
detected. If missing CQ pulses or multiple CQ pulses
or CQ pulse width calculation errors were detected, the
fail counter will be incremented. If the failure counter
exceeds the calibration, then the test is complete and
a failure will be reported.

Conditions for setting the DTC

D

Ignition voltage is between 10volt and 16 volts.

D

MAP sensor signal is between 26kPa and 100 kPa.

D

Fuel level is more than 10%.

D

Engine speed is between 650rpm and 6500rpm.

D

No Crank DTCs set.

D

No System voltage DTCs set.

Action Taken When the DTC Sets

D

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

D

The PCM calculates an air flow value based on idle air
control valve position, throttle position, RPM and
barometric pressure.

D

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

D

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.

D

A history DTC P1310 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.

D

DTC P1310 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:

D

Poor connections.