Isuzu Trooper (1998-2002 year). Manual - part 431

6E–94

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Service Vehicle Soon (SVS) Lamp “ON” Steady

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 ignition “ON” and the engine stopped.  Ignition feed
voltage is supplied directly to the SVS lamp indicator.  The
powertrain control module (PCM) turns the SVS lamp
“ON” by grounding the SVS lamp driver circuit.
The RPL should not remain “ON” with the engine running
and no DTC(s) set.  A steady SVS lamp with the engine
running and no DTC(s) suggests a short to ground in the
SVS lamp driver circuit.

Diagnostic Aids

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

D

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

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
2. If the SVS lamp does not remain “ON” when the

PCM is disconnected, the SVS lamp driver wiring is
not faulty.

3. If the SVS lamp driver circuit is OK, the instrument

panel cluster is faulty.

6. 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 in
Powertrain Control Module (PCM) and Sensors.

6E–95

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

Service Vehicle Soon (SVS) Lamp “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 SVS lamp.

Is the SVS lamp “ON”?

—

Go to 

Step 3

Go to 

Step 5

3

1. Ignition “OFF”, disconnect the instrument panel

cluster.

2. Check the SVS lamp 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 SVS lamp 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

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

Did the SVS lamp 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–96

6VE1 3.5 ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

D06R200100

6E–97

6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS

D06R200081