Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1409

6E2–87

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

Malfunction Indicator Lamp (MIL) “ON” Steady

060R200049

Circuit description

The malfunction indicator 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:

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 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.

6E2–88

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 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

—

6E2–89

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

No Reduced Power Lamp (RPL)

060R200073

Circuit Description

The Reduced Power lamp (RPL) should always be
illuminated and steady with the ignition “ON” and the
engine stopped. Ignition feed voltage is supplied to the
RPL bulb through the meter fuse. The powertrain control
module (PCM) orders the RPL “ON” signal for Multiplex
Control Unit. When Multiplex Control Unit is received RPL
“ON” signal that turn RPL “ON” by grounding the RPL
driver circuit.

Diagnostic Aids

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

D

Inspect the PCM and Multiplex Control Unit 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 MIL 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 RPL” 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

Multiplex Control Unit ground terminals to ensure
that a good ground is present. Refer to Multiplex
Control Unit Terminal End View for terminal
locations of the Unit Terminal End View for terminal
locations of the Multiplex Control Unit ground
circuits.

12.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.

21.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.

24.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.

6E2–90

RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS

No Reduced Power Lamp (RPL)

 

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 11

3

Check the following fuses:
MAIN(100A), B+1(60A), B+2(50A), METER(15A),
ECM(15A) , ENGINE(15A)

Was a problem found?

—

Go to 

Step 14

Go to 

Step 4

4

1. Ignition ”OFF”.
2. Disconnect the cluster meter connector.
3. 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 15

5

1. Ignition “OFF”.
2. Disconnect the Multiplex Control Unit.
3. Check the circuit (Lamp driver Circuit) between

PCM and Multiplex Control Unit.

Was a problem found?

—

Go to 

Step 16

Go to 

Step 6

6

1. Reconnect the cluster meter connector.
2. Disconnect the Multiplex Control Unit.
3. Jumper the RPL driver circuit at the Multiplex

Control Unit connector to ground.

4. Ignition “ON”.

Is the RPL “ON”?

—

Go to 

Step 7

Go to

Instrument

Panel in

Electrical

Diagnosis

7

1. Ignition “OFF”.
2. Probe the ignition feed circuit at the Multiplex

Control Unit connector with a test light to ground.

3. Ignition “ON”.

Is the test light “ON”?

—

Go to 

Step 8

Go to 

Step 17

8

1. Ignition “OFF”.
2. Disconnect the PCM.
3. Check the circuit (Lamp driver Circuit) between

PCM and Multiplex Control Unit.

Was a problem found?

—

Go to 

Step 18

Go to 

Step 9

9

Check the Multiplex Control Unit ground connection
and circuit.

Was a problem found?

—

Go to 

Step 19

Go to 

Step 10

10

Check for damaged terminals at the Multiplex Control
Unit.

Was a problem found?

—

Go to 

Step 20

Go to 

Step 11

11

1. Ignition “ON”.
2. Probe the ignition feed circuit at the PCM harness

connector with a test light to ground.

Is the test light “ON”?

—

Go to 

Step 12

Go to 

Step 21