Isuzu Trooper (1998-2002 year). Manual - part 430

6E–90

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Malfunction Indicator Lamp (MIL) “ON” Steady

 

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”, disconnect PCM.
2. Ignition “ON”, observe the MIL (Service Engine

Soon lamp).

Is the MIL “ON”?

—

Go to 

Step 3

Go to 

Step 5

3

1. Ignition “OFF”, disconnect the instrument panel

cluster.

2. Check the MIL driver circuit between the PCM and

the instrument panel cluster for a short to ground.

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

Was the MIL driver circuit shorted to ground?

—

Go to 

OBD

System

Check

Go to 

Step 4

4

Replace the instrument panel cluster.

Is the action complete?

—

Go to 

OBD

System

Check

—

5

1. Ignition “OFF”, reconnect the PCM.
2. Ignition “ON”, reprogram the EEPROM. Refer to

On-Vehicle Service in Powertrain Control Module
and Sensors for procedures.

3. Using the Tech 2 output controls function, select

MIL dash lamp control and command the MIL
“OFF”. (Refer to the Miscellaneous test)

Did the MIL turn “OFF”?

—

Go to 

OBD

System

Check

Go to 

Step 6

6

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.

Is the action complete?

—

Go to 

OBD

System

Check

—

6E–91

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

No Service Vehilce Soon (SVS) Lamp

D06R200111

Circuit Description

The Service Vehicle Soon (SVS) lamp is a lamp which
added the function of Immobi warning to the Reduced
Power Lamp (RPL).
The SVS lamp should always be illminated and steady
with the ignition “ON” and the engine stopped.  Ignition
feed voltage is supplied to the SVS lamp bulb through the
meter fuse.  The powertrain control module (PCM) turns
the SVS lamp “ON” by grounding the SVS lamp driver
circuit.

Diagnostic Aids

An intermittent SVS lamp may be cased by a poor
connection, rubbed-through wire insulation, or a wire
broken inside the insulation.  Check for the following
items:

D

Inspect the PCM harness and connections for
improper mating, broken locks, improperly formed or
damaged terminals, poor terminal-to-wire
connection, and damaged harness.

D

If the engine runs OK, check for a faulty light bulb, an
open in the SVS lamp driver circuit, or an open in the
instrument cluster ignition feed.

D

If the engine cranks but will not run, check for an open
PCM ignition or battery feed, or a poor PCM to engine
ground.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. A “No SVS lamp” condition accompanied by a

no-start condition suggests a faulty PCM ignition
feed or battery feed circuit.

9. Using a test light connected to B+, probe each of the

PCM ground terminals to ensure that a good ground
is present.  Refer to 

PCM Terminal End View for

terminal locations of the PCM ground circuits.

12.In this step, temporarily substitute a known good

relay for the PCM relay.  The horn relay is nearby,
and it can be verified as “good” simply by honking
the horn.  Replace the horn relay after completing
this step.

17.This vehicle is equipped with a PCM which utilizes

an electrically erasable programmable read only
memory (EEPROM).  When the PCM is replaced,
the new PCM must be programmed.  Refer to 

PCM

Replacement and Programming Procedures
Powertrain Control Module (PCM) and Sensors.

6E–92

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

No Service Vehicle Soon (SVS) Lamp

 

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

Attempt to start the engine.

Does the engine start?

—

Go to 

Step 3

Go to 

Step 6

3

Check the meter fuse for the instrument cluster ignition
feed circuit.

Is the fuse OK?

—

Go to 

Step 4

Go to 

Step 16

4

Ignition “ON”, probe the ignition feed circuit at the
cluster connector with a test light to ground.

Is the test light “ON”?

—

Go to 

Step 5

Go to 

Step 13

5

1. Ignition “OFF”.
2. Disconnect the PCM.
3. Jumper the SVS lamp driver circuit at the PCM

connector to ground.

4. Ignition “ON”.

Is the SVS lamp “ON”?

—

Go to 

Step 10

Go to 

Step 11

6

Check the PCM ignition feed and battery feed fuses (15
A engine fuse and 15 A PCM fuse).

Are both fuses OK?

—

Go to 

Step 7

Go to 

Step 15

7

1. Ignition “OFF”.
2. Disconnect the PCM.
3. Ignition “ON”.
4. Probe the ignition feed circuit at the PCM harness

connector with a test light to ground.

Is the test light “ON”?

—

Go to 

Step 8

Go to 

Step 12

8

Probe the battery feed circuit at the PCM harness
connector with a test light to ground.

Is the test light “ON”?

—

Go to 

Step 9

Go to 

Step 14

9

Check for a faulty PCM ground connection.

Was a problem found?

—

Verify repair

Go to 

Step 10

10

Check for damaged terminals at the PCM.

Was a problem found?

—

Verify repair

Go to 

Step 17

11

Check for an open SVS lamp driver circuit between the
PCM and the SVS lamp.

Was a problem found?

—

Verify repair

Go to 

Step 18

12

Substitute a known “good” relay for the PCM main
relay.

Was the malfunction fixed?

—

Verify repair

Go to 

Step 13

13

Repair the open in the ignition feed circuit.

Is the action complete?

—

Verify repair

—

14

Locate and repair the open PCM battery feed circuit.

Is the action complete?

—

Verify repair

—

6E–93

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

No Service Vehicle Soon (SVS) Lamp

  (Cont'd)

Step

No

Yes

Value(s)

Action

15

Locate and repair the short to ground in the PCM
ignition feed circuit or PCM battery feed circuit.

Is the action complete?

—

Verify repair

—

16

Locate and repair the short to ground in the ignition
feed circuit to the instrument cluster, and replace the
fuse.

Is the action complete?

—

Verify repair

—

17

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to 

PCM in ON-Vehicle Service 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

—

18

Check the SVS lamp driver circuit for a poor connection
at the instrument panel connector.

Was a problem found?

—

Verify repair

Go to

Instrument

Panel in

Electrical

Diagnosis