Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1252

6E1–84

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

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 in
Powertrain Control Module (PCM) and Sensors.

No Malfunction Indicator Lamp (MIL)

Step

Action

Value(s)

Yes

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

—

Go to Step 2

Go to OBD

System

Check

Attempt to start the engine.

Does the engine start?

—

Go to Step 3

Go to Step 6

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

Is the fuse OK?

—

Go to Step 4

Go to Step 16

1. Ignition ON.
2. Engine OFF.
3. 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

1. Ignition OFF.
2. Disconnect the PCM.
3. Jumper the MIL driver circuit at the PCM connector

to ground.

4. Ignition ON.

Is the MIL ON?

—

Go to Step 10

Go to Step 11

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

Are both fuses OK?

—

Go to Step 7

Go to Step 15

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

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

Check for a faulty PCM ground connection.

Was a problem found?

—

Verify repair

Go to Step 10

Check for damaged terminals at the PCM.

Was a problem found?

—

Verify repair

Go to Step 17

Check for an open MIL driver circuit between the PCM
and the MIL.

Was a problem found?

—

Verify repair

Go to Step 18

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

Was the malfunction fixed?

—

Verify repair

Go to Step 13

6E1–85

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

No Malfunction Indicator Lamp (MIL)

(Cont'd)

Step

Yes

Value(s)

Action

Repair the open in the ignition feed circuit.

Is the action complete?

—

Verify repair

—

Locate and repair the open PCM battery feed circuit.

Is the action complete?

—

Verify repair

—

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

Is the action complete?

—

Verify repair

—

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

—

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.

—

Verify repair

—

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

6E1–86

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

MALFUNCTION INDICATOR LAMP (MIL) ON STEADY

060R100048

Circuit Description

The malfunction indicator lamp (MIL) should always be
illuminated and steady with the 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:

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

6E1–87

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Malfunction Indicator Lamp (MIL) ON Steady

Step

Action

Value(s)

Yes

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

—

Go to Step 2

Go to OBD

System

Check

1. Ignition OFF, disconnect the PCM.
2. Ignition ON, observe the MIL (Service Engine Soon

lamp).

Is the MIL ON?

—

Go to Step 3

Go to Step 5

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

Replace the instrument panel cluster.

Is the action complete?

—

Go to OBD

System

Check

—

1. Ignition OFF, reconnect the PCM.
2. Ignition ON, reprogram the PCM. 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.

Did the MIL turn OFF?

—

Go to OBD

System

Check

Go to Step 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

—

Content .. 1250 1251 1252 1253 ..