Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual — part 265
6E–90
6VE1 3.5L 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
6E–91
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
No Reduced Power Lamp (RPL)
(Cont'd)
Step
No
Yes
Value(s)
Action
12
1. Ignition “OFF”.
2. Check for a faulty PCM ground connection and
Circuit.
Was a problem found?
—
Go to
Step 23
Go to
Step 13
13
Check for damaged terminals at the PCM.
Was a problem found?
—
Go to
Step 24
Go to
Step 25
14
Replace the fuse.
Is the action complete?
—
Verify repair
—
15
Locate and repair the cluster meter battery feed open
circuit.
Is the action complete?
—
Verify repair
—
16
Locate and repair the circuit between cluster meter and
Multiplex Control Unit open circuit.
Is the action complete?
—
Verify repair
—
17
Locate and repair the circuit Multiplex Control Unit
battery feed open circuit.
Is the action complete?
—
Verify repair
—
18
Locate and repair the between Multiplex Control Unit
and PCM open circuit.
Is the action complete?
—
Verify repair
—
19
Locate and repair the ground connection for Multiplex
Control Unit circuit.
Is the action complete?
—
Verify repair
—
20
Reconnect the Multiplex Control Unit. circuit.
Is the action complete?
—
Verify repair
—
21
Substitute a known “good” relay for the PCM main
relay.
Was the malfunction fixed?
—
Verify repair
Go to
Step 22
22
Repair the open in the ignition feed circuit.
Is the action complete?
—
Verify repair
—
23
Locate and repair the ground connection for PCM
circuit.
Is the action complete?
—
Verify repair
—
24
Replace the PCM.
IMPORTANT: The replacement PCM must be
programmed.
Refer to ON-Vehicle Service in Power 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?
—
Verify repair
—
6E–92
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
No Reduced Power Lamp (RPL)
(Cont'd)
Step
No
Yes
Value(s)
Action
25
1. Ignition “OFF”.
2. Reconnect all connectors.
3. Install the Tech 2.
4. Ignition “ON”.
5. Using the Tech 2 output controls function, select
RPL dash lamp control and command the RPL
“ON”. (Refer to the Miscellaneous test)
Did the RPL turn “ON”?
—
Verify repair
Go to
Step 26
26
1. Ignition “OFF”.
2. Disconnect the PCM.
3. Check the circuit (DLC line) between PCM and
DLC.
Was a problem found?
—
Go to
Step 27
Go to
Step 24
27
Locate and repair the circuit the between PCM and
DLC.
Is the action complete?
—
Go to
Step 25
—
6E–93
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Reduced Power Lamp (RPL) “ON” Steady
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.
The RPL should not remain “ON” 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:
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 RPL does not remain “ON” 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.
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