Content .. 353 354 355 356 ..

Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual - part 355

6E–450

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1290 - ETC Forced Idle Mode

(Cont'd)

Step

Yes

Value(s)

Action

Replace the AP sensor.

Is the action complete?

—

Verify repair

—

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–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 “ON”.

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 “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 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 “Clear
Info” 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, the

information 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

Step

Action

Value(s)

Yes

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

—

Go to

Step 2

Go to

OBD

System

Check

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

—

Go to

Step 3

Go to

ETC

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 P1295.

Does the Tech 2 indicate DTC P1295 failed this
ignition?

—

Go to

Step 4

Refer to

Diagnostic

Aids

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

∼

10 %

Go to

Step 9

Go to

Step 5

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

Is the DC motor reading near the specified value?

0.3

∼

100

Go to

Step 6

Go to

Step 8

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 7

Check the throttle valve assembly.

Was a problem found?

Verify repair

Go to

Step 8

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

Is the action complete?

—

Verify repair

—

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

Is the TP sensor reading near the specified value?

Go to

Step 10

Go to

Step 11

6E–453

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1295 - ETC Power Management Mode

(Cont'd)

Step

Yes

Value(s)

Action

1. Connect a test light between the 5Volt reference “A”

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?

Go to

Step 13

Go to

Step 12

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 14

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 14

Replace the TP sensor.

Is the action complete?

—

Verify repair

—

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?

∼

10 g/s

Go to

Step 15

Go to

Step 18

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 16

Go to

Step 17

Replace the MAF sensor.

Is the action complete?

—

Verify repair

—

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 23

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?

∼

10 g/s

Go to

Step 16

Go to

Step 19

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