Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service 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
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