Isuzu Trooper (2000 year). Manual — part 242
6E–97
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Reduced Power Lamp (RPL) “ON” Steady
D06RY00127
Circuit Description
The Reduced Power lamp (RPL) should always be
illuminated and steady with ignition “ON” and the engine
stopped. Ignition feed voltage is supplied directly to the
RPL indicator. The powertrain control module (PCM)
turns the 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 cased 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 PCM is
disconnected, the RPL driver wiring is not faulty.
3. If the RPL 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.
6E–98
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Reduced Power Lamp (RPL) “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 RPL (Reduced Power
Lamp).
Is the RPL “ ON?”
—
Go to
Step 3
Go to
Step 5
3
1. Ignition “OFF,” disconnect the instrument panel
cluster.
2. Check the RPL 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 RPL 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
RPL dash lamp control and command the RPL
“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 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 PROGRMMED
SOFTWARE to the replasement PCM.
Is the action complete?
—
Go to
OBD
System
Check
—
6E–99
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Engine Cranks But Will Not Run
D06RY00150
6E–100
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
D06RY00042
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