Isuzu Trooper (2000 year). Manual — part 337

6E–477

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC)

P1516 Command - Actual TPS Correlation Error

D06RY00088

Circuit Description

D

The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle position (blade angle).
The throttle blade angle will vary about 8 % at closed
throttle to about 92 % at wide open throttle (WOT).

D

The DC motor circuit provides a voltage signal relative
to command throttle position (blade angle).

D

This DTC detects the dufference between actual
throttle position and command throttle position in
steady state.

Conditions for setting the DTC

D

The ignition is “ON”.

D

Throttle Actuation mode is normal.

D

Command Throttle position-Actual Throttle positionis
less than 8 % when desird TPS is sutudy wihtin 0.5
%for 30 second within test samples (30 second)

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 P1516 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.

D

DTC P1516 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 connectons.

D

Mis routed harness.

D

Rubbed through wire insulation.

D

Broken wire inside the insulation.

Check for the following conditions:

D

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.

D

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 Tech2 while
moving connectors and wiring harnesses related to the
sensor.

6E–478

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

A change in the display will indicate the location of
the fault. If DTC P1516 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 P1516
Diagnostic Chart may isolate the cause of the
fault.

DTC P1516 - Command - Actual TPS Correlation Error

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

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 P1516.

Does the Tech 2 indicate DTC P1516 failed this
ignition?

—

Go to

Step 4

Refer to

Diagnostic

Aids

4

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 5

5

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

Is the DC motor reading near the specified value?

0.3

∼

100

m

Go to

Step 6

Go to

Step 7

6

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 8

7

Replace the DC motor.

Is the action complete?

—

Verify repair

Go to

Step 6

8

1. Disconnect the TP sensor.
2. Observe the TP sensor reading on the Tech2.

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–479

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1516 - Command - Actual TPS Correlation Error

(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 TP1
and 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

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 replasement PCM.

Is the action complete?

—

Verify repair

—

6E–480

TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1523 Actuator Control Return Performance

D06RY00088

Circuit Description

D

The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle position (blade angle).

The throttle blade angle will vary about 8 % at
closed throttle to about 92 % at wide open
throttle(WOT).

D

The DC motor circuit provides a voltage signal relative
to command throttle position (blade angle).

D

This DTC ditects if the throttle return to the default
position at key on, steady state.

Conditions for setting the DTC

D

The ignition is “ON”.

D

Normalized TPS is less than 0 % but Normalized TPS
is more than 25 %.

Action Taken When the DTC Sets

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 P1523 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.

D

DTC P1523 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 connectons.

D

Mis routed harness.

D

Rubbed through wire insulation.

D

Broken wire inside the insulation.

Check for the following conditions:

D

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.

D

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 P1523 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 P1523
Diagnostic Chart may isolate the cause of the
fault.