instrument cluster ISUZU AXIOM 2002 Service User Guide

6E±89
6VE1 3.5L 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 ªONº 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 ªONº signal for Multiplex
Control Unit. When Multiplex Control Unit is received RPL
ªONº signal that turn RPL ªONº 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:

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.

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.

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 ªNo RPLº 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 ªgoodº 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.

6E±90
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
No Reduced Power Lamp (RPL)

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
Performed?
ÐGo to Step 2
Go to OBD
System
Check
2Attempt to start the engine.
Does the engine start?
ÐGo to Step 3Go to Step 11
3Check the following fuses:
MAIN(100A), B+1(60A), B+2(50A), METER(15A),
ECM(15A) , ENGINE(15A)
Was a problem found?
ÐGo to Step 14Go to Step 4
41. Ignition ºOFFº.
2. Disconnect the cluster meter connector.
3. Ignition ªONº, Probe the ignition feed circuit at the
cluster connector with a test light to ground.
Is the test light ªONº?
ÐGo to Step 5Go to Step 15
51. Ignition ªOFFº.
2. Disconnect the Multiplex Control Unit.
3. Check the circuit (Lamp driver Circuit) between
PCM and Multiplex Control Unit.
Was a problem found?
ÐGo to Step 16Go to Step 6
61. 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 ªONº.
Is the RPL ªONº?
ÐGo to Step 7
Go to
Instrument
Panel in
Electrical
Diagnosis
71. Ignition ªOFFº.
2. Probe the ignition feed circuit at the Multiplex
Control Unit connector with a test light to ground.
3. Ignition ªONº.
Is the test light ªONº?
ÐGo to Step 8Go to Step 17
81. Ignition ªOFFº.
2. Disconnect the PCM.
3. Check the circuit (Lamp driver Circuit) between
PCM and Multiplex Control Unit.
Was a problem found?
ÐGo to Step 18Go to Step 9
9Check the Multiplex Control Unit ground connection
and circuit.
Was a problem found?
ÐGo to Step 19Go to Step 10
10Check for damaged terminals at the Multiplex Control
Unit.
Was a problem found?
ÐGo to Step 20Go to Step 11
111. Ignition ªONº.
2. Probe the ignition feed circuit at the PCM harness
connector with a test light to ground.
Is the test light ªONº?
ÐGo to Step 12Go to Step 21

6E±93
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Reduced Power Lamp (RPL) ªONº Steady
060R200073
Circuit Description
The Reduced Power lamp (RPL) should always be
illuminated and steady with the ignition ªONº 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 ªONº signal for Multiplex
Control Unit. When Multiplex Control Unit is received RPL
ªONº signal that turn RPL ªONº by grounding the RPL
driver circuit.
The RPL should not remain ªONº with the engine running
and no DTC(s) set. A steady RPL with the engine running
and no DTC(s) suggests a short to ground in 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:
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 RPL does not remain ªONº when the Multiplex
Control Unit is disconnected, the RPL driver wiring
is not faulty.
3. If the RPL driver circuit is OK, the instrument panel
cluster is faulty.
10. 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±94
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Reduced Power Lamp (RPL) ªONº Steady

StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Ignition ªOFFº, disconnect Multiplex Control Unit.
2. Ignition ªONº, observe the RPL (Reduced Power
Lamp).
Is the RPL ªONº?
ÐGo to Step 3Go to Step 4
31. Ignition ªOFFº, disconnect the instrument panel
cluster.
2. Check the RPL driver circuit between the Multiplex
Control Unit and the instrument panel cluster for a
short to ground.
3. If a problem is found, repair as necessary.
Was the RPL driver circuit shorted to ground?
ÐVerify repairGo to Step 4
41. Replace the Multiplex Control Unit.
2. Install the Tech 2
3. Ignition ªONº.
4. Using the Tech 2 output controls function, select
RPL dash lamp control and command the RPL
ªOFFº. (Refer to the Miscellaneous test)
Did the MIL turn ªOFFº?
ÐVerify repairGo to Step 5
51. Ignition ªOFFº.
2. Disconnect the PCM.
3. Check the circuit (Lamp driver Circuit) between
PCM and Multiplex Control Unit.
Was a problem found?
ÐGo to Step 6Go to Step 7
6Locate and repair the circuit between Multiplex Control
Unit and PCM open circuit.
Is the action complete?
ÐGo to Step 7Ð
71. Install the Tech 2
2. Ignition ªONº.
3. Using the Tech 2 output controls function, select
RPL dash lamp control and command the RPL
ªOFFº. (Refer to the Miscellaneous test)
Did the MIL turn ªOFFº?
Ð
Go to Verify
repair
Go to Step 8
81. Ignition ºOFFº.
2. Disconnect the PCM.
3. Check the circuit (DLC line) between PCM and
DLC.
Was a problem found?
ÐGo to Step 9Go to Step 10

6E±500
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC)
P1640 Driver-1-Output Circuit Fault (ODM)
Circuit Description
Output driver modules (ODMs) are used by the
powertrain control module (PCM) to turn ªONº many of
the current-driven devices that are needed to control
various engine and transmission functions. Each ODM is
capable of controlling up to 7 separate outputs by
applying ground to the device which the PCM is
commanding ªONº.
Unlike the Quad Driver Modules (QDMs) used in prior
model years, ODMs have the capability of diagnosing
each output circuit individually. DTC P1640 set indicates
an improper voltage level has been detected on an ODM
output.
Since A/C is an option, No A/C will cause the air
conditioning clutch relay output to always fail. If a fault is
seen on the air conditioning clutch relay output, it will not
be logged as a fault until the A/C request input interrupts a
high voltage, indicating that A/C has been installed.
Conditions for Setting the DTC

Ignition ªONº.

Engine running.

Ignition voltage is above 13.2 volts for 4 seconds.

Output voltage does not equal ignition voltage when
output is ªOFFº or output voltage is not less than 1 volt
when output is ªONº.

Above conditions occur for at least 1 second.
Action Taken When the DTC Sets

The PCM will not illuminate the malfunction indicator
lamp (MIL).

The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC

A history DTC P1640 will clear after 40 consecutive
warm-up cycles occur without a fault.

DTC P1640 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:

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

Damaged harness ± Inspect the wiring harness for
damage, If the harness appears to be OK, disconnect
the PCM, turn the ignition ªONº and observe a
voltmeter connected to the suspect driver circuit at the
PCM harness connector while moving connectors and
wiring harnesses related to the MIL. A change in
voltage will indicate the location of the fault.

Poor connection at component ± Examine for
damaged connectors, unplugged connector, or
damaged terminals at the following locations:
Instrument cluster harness, canister purge solenoid,
A/C clutch relay. An open ignition feed circuit at any of
these components will cause DTC P1640 to be set.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
4. The Tech 2 Driver Module Status indicates the PCM
pin that is affected.
9. The Tech 2 may indicate ªshort circuitº even when
the problem is an open circuit. The cause of an
open circuit may be in the component itself-lamp,
purge, solenoid, or A/C compressor relay.
11.A short to ground on the ignition side of the
component will blow the fuse. Since the fuse was
checked in Step 2, a short to ground would be
between the affected component and the PCM.

7A±34
AUTOMATIC TRANSMISSION (4L30±E)
Shift Lock Cable
Removal
1. Set ignition key in ªLOCKº position and selector lever
in ªPº position.
2. Remove knee pads, cluster upper cover, center
cluster assembly, rear console, and front console.

Refer to
Selector Lever in this section.
3. Disconnect inner cable from selector lever assembly
then push claw and disconnect cable assembly.
256R200002
4. Disconnect lock adjust.
256R200003
5. Remove instrument panel lower cover and steering
column cover.6. Remove spring pin and disconnect inner cable.

Disconnect outer cable from bracket.
256RW008
Installation
1. Set ignition key in ªLOCKº position and selector lever
in ªPº position.
2. Connect outer cable to bracket near steering lock.

Connect inner cable to steering lock and install
spring pin.
3. Install steering column cover and instrument lower
cover.
4. Install adjust body of cable assembly to bracket in
selector lever assembly.

Install inner cable to lever, pulling inner cable with
outer cable.
256R200004

8A±14LIGHTING SYSTEM
Vanity Mirror Illumination Light Bulb
Removal
1. Disconnect the battery ground cable.
2. Remove the lens (1).
3. Remove the bulb (2).
805R200004
Installation
To install, follow the removal steps in the reverse order.
Switch Unit Assembly Illumination Light Bulb
(Power/Winter & Intelligent Suspension Switch)
Removal
1. Disconnect the battery ground cable.
2. Remove the center cluster assembly.

Refer to
Instrument Panel Assembly in Body
Structure
section.
3. Remove the audio.

Refer to
Audio in Entertainment section.
4. Remove the illumination light bulb.
825R200036
Installation
To install, follow the removal steps in the reverse order.

LIGHTING SYSTEM8A±15
TOD Switch Illumination Light Bulb
Removal
1. Disconnect the battery ground cable.
2. Remove the meter cluster (1).

Refer to
Instrument Panel Assembly in Body
Structure
section.
3. Remove the bulb (3).

Disconnect the TOD switch connector and cruise
control main switch connector.

Remove the TOD switch (2).
825R200033
Installation
To install, follow the removal steps in the reverse order.
Cruise Control Main Switch Illumination Light Bulb
Removal
1. Disconnect the battery ground cable.
2. Remove the meter cluster panel (4).

Refer to
Instrument Panel Assembly in Body
Structure
section.
3. Remove the bulb (1).

Disconnect the TOD switch connector and cruise
control main switch connector.

Remove the TOD switch (3).

Remove the cruise main switch (2).
825R200032
Installation
To install, follow the removal steps in the reverse order.

LIGHTING SYSTEM8A±19
Key Remind Switch (Starter Switch)
Removal and Installation
Refer to Lock Cylinder in Steering section.
Hazard Warning Light Switch
Removal
1. Disconnect the battery ground cable.
2. Remove the center cluster assembly (1).

Refer to
Instrument Panel Assembly in Body
Structure
section.
3. Remove the hazard warning switch (2).

Disconnect the switch connector.

To remove the switch, push the lock from the back
side of the center cluster assembly.
825R200026
Installation
To install, follow the removal steps in the reverse order.

8A±20LIGHTING SYSTEM
Stoplight Switch
Removal and Installation
Refer to Stoplight Switch in Brake section.
Turn Signal Light Switch (Combination Switch)
Removal and Installation
Refer to Combination Switch in Steering section.
Illumination Controller
Removal
1. Disconnect the battery ground cable.
2. Remove the meter cluster panel cover assembly (2).

Refer to
Instrument Panel Assembly in Body
Structure
section.
3. Remove the illumination controller (1).

Disconnect the controller connector.

Remove the controller knob (4).

Remove the nut (3).

Remove the controller from the back side of the
meter cluster panel assembly.
825R200027
Installation
To install, follow the removal steps in the reverse order.