Isuzu Rodeo UE. Manual — part 332

6E2–83

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

No Malfunction Indicator Lamp (MIL)

(Cont'd)

Step

No

Yes

Value(s)

Action

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

—

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 MIL driver circuit for a poor connection at the
instrument panel connector.

Was a problem found?

—

Verify repair

Go to

Instrument

Panel in

Electrical

Diagnosis

6E2–84

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Malfunction Indicator Lamp (MIL) “ON” Steady

D06RX012

Circuit description

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

f

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 MIL does not remain “ON” when the PCM is

disconnected, the MIL driver wiring is not faulty.

3. If the MIL 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.

6E2–85

RODEO 6VD1 3.2L 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 PCM. Refer to

On-Vehicle Service in Powertrain Control Module
and Sensor 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

—

6E2–86

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

D06RX013