Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1509

6E2–487

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1523 - Actuator Control Return Performance

  (Cont'd)

Step

No

Yes

Value(s)

Action

10

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 11

11

Replace the TP sensor.

Was a problem found?

—

Verify repair

—

12

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

—

6E2–488

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) P1571 Brake Switch No Operation

060R200067

Circuit Description

The brake switch has 3 functions.

D

Brake pedal operation check

D

Brake light operation (On and off)

D

Cruise control (Cancel)

The PCM receives vehicle speed and switch position
signals from the brake switch. The PCM sets brake
operating conditions in response to these signals.
If the brake switch is on, the brake system is in normal
operation (cruise control cancelled).

Conditions for Setting the DTC

D

Two break switch signals do not acknowledge after
signal changed.

D

Switch does not change during accelerating vehicle or
decelerating.

D

VSS is not fault.

D

Engine is running.

Action Taken When the DTC Sets

D

The PCM will not turn the malfunction indicator lamp
(MIL) “ON”.

D

The PCM will store conditions which were present
when the DTC was set as Failure Records only.  This
information will not be stored as Freeze Frame data.

Conditions for Clearing the DTC

D

DTC P1571 can be cleared by using the scan tool
“Clear Info” function or by disconnecting the PCM
battery feed.

Diagnostic Aids

D

Damaged harness–Inspect the wiring harness for
damage.  If the harness appears to be OK, observe the
fuel level display on the scan tool while moving
connectors and wiring harnesses related to the sensor.
A change in the display will indicate the location of the
fault.

6E2–489

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

DTC P1571 Brake Switch No Operation

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Ignition “Off”.

Engine “Off”.

2. Check following fuses.

D

BACK 15A

D

STOP LAMP 15A

Was a problem found?

—

Verify repair

Go to 

Step 3

3

1. Make adjustment to the brake switch.

(Refer to 

“Brake switch” in “10A CRUISE

CONTROL SYSTEM”.)

Was the problem found?

—

Verify repair

Go to 

Step 4

4

1. Push the shaft on brake switch.
2. Check shaft operation for smooth movement.

Was the problem found?

—

Verify repair

—

5

1. Disconnect the connector at brake switch.
2. Check following terminal pin by ohmmeter.

(Leave the shaft position at brake switch. Don’t
push it.)

D

Between pin 1 and pin 2

D

Between pin 3 and pin 4

Was it specified value?

Between pin1

and pin2 is

0

W

,  Between

pin3 and pin4

is 

∞

W

Go to 

Step 6

Go to 

Step 9

6

1. Disconnect the connector at brake switch.
2. Check following terminal pin at ohmmeter.

(Don’t press the button of the brake switch.)

D

•

Between pin 1 and pin 2

D

•

Between pin 3 and pin 4

Was it specified value?

Between pin1

and pin2 is

∞

W

,  Between

pin3 and pin4

is 0

W

Go to 

Step 7

Go to 

Step 9

7

1. Probe related circuits for open or short to ground.
2. If a problem was found, repair as necessary.

Was a problem found?

—

Verify repair

Go to 

Step 8

8

1. Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed.  Refer to 

On-Vehicle Service in

Powertrain 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.

Was the action completed?

—

Verify repair

—

9

1. Replace the brake switch.

Was the action completed?

—

Verify repair

—

6E2–490

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Diagnostic Trouble Code (DTC) 

P1625 PCM Unexpected Reset

Circuit Description

The powertrain control module (PCM) monitors
unexpected PCM reset. This will not turn on MIL light on,
only record code DTC P1625.

Conditions for Setting the DTC

D

Clock or COP (Computer Operating Properly) reset.

Action Taken When the DTC Sets

D

The PCM will not illuminate the malfunction indicator
lamp (MIL).

D

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame 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 condition is no longer present.

D

A history DTC P1625 will clear after 40 consecutive
warm-up cycles have occurred without a fault.

D

DTC P1625 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:

D

P1625 stored alone does not need diagnosis. Clear
DTC code.

DTC P1625 – PCM Unexpected Reset

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to Step 2

Go to 

OBD

System

Check

2

1. Ignition is “ON”.
2. Install the Tech 2.
3. Start the engine and let it Idle.
4. On the Tech 2, select “DTC info”.

Does the Tech 2 indicate DTC P1625 failed?

—

Go to 

Step 3

Go to

Diagnostic

Aids

3

1. Ignition is “ON”.
2. Clear DTC P1625 by using the Tech 2 “Clear Info”.
3. Start the engine and let it Idle.
4. On the Tech 2, select “DTC info”.

Does the Tech 2 indicate DTC P1625 failed?

—

Go to 

Step 4

Go to

Diagnostic

Aids

4

1. Check for aftermarket electronics, such as

transceiver, stereos, and anti theft devices. They
may radiate EMI into the control system if they are
improperly installed. (This may cause a false sensor
reading and turn on the MIL.)

2. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

—