Mitsubishi Montero Sport (2004+). Manual — part 62
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
TSB Revision
GENERAL <BODY AND CHASSIS>
00-7
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE
POINTS
M1001000200548
Troubleshooting of electronic control systems for
which the scan tool can be used follows the basic
outline described below. Even in systems for which
the scan tool cannot be used, part of these systems
still follows this outline.
TROUBLESHOOTING CONTENTS
.
1. STANDARD FLOW OF DIAGNOSTIC TROU-
BLESHOOTING
Troubleshooting strategy is shown in each group.
.
2. SYSTEM OPERATION AND SYMPTOM
VERIFICATION TESTS
If verification of the symptom(s) is difficult, proce-
dures for checking operation and verifying symptoms
are shown.
.
3. DIAGNOSTIC FUNCTION
The following trouble code diagnosis are shown.
• How to read diagnostic trouble codes
• How to erase diagnostic trouble codes
• Input inspection service points
.
4. DIAGNOSTIC TROUBLE CODE CHART
If the scan tool displays a diagnostic trouble code,
retrieve an applicable inspection procedure accord-
ing to this chart.
.
5. SYMPTOM CHART
If there are symptoms, even though the results of
inspection using the scan tool show that all diagnos-
tic trouble codes are normal, inspection procedures
for each symptom will be found by using this chart.
.
6. DTC PROCEDURES
Indicates the inspection procedures corresponding to
each diagnostic trouble codes. (Refer to .)
.
7. SYMPTOM PROCEDURES
Indicates the inspection procedures corresponding to
each symptoms classified in the Symptom Chart.
(Refer to
.
8. SERVICE DATA REFERENCE TABLE
Inspection items and normal judgment values have
been provided in this chart as reference information.
.
9. CHECK AT ECU TERMINALS
Terminal numbers for the ECU connectors, inspec-
tion items, and standard values have been provided
in this chart as reference information.
.
TERMINAL VOLTAGE CHECKS
1. Connect a needle-nosed wire probe to a voltmeter
probe.
CAUTION
Short-circuiting the positive (+) probe between a
connector terminal and ground could damage
the vehicle wiring, the sensor, the ECU, or all
three. Use care to prevent this!
2. Insert the needle-nosed wire probe into each of
the ECU connector terminals from the wire side,
and measure the voltage while referring to the
check chart.
NOTE: Measure voltage with the ECU connectors
connected.
You may find it convenient to pull out the ECU to
make it easier to reach the connector terminals.
Checks don't have to be carried out in the order
given in the chart.
3. If voltage readings differ from normal condition
values, check related sensors, actuators, and
wiring, then replace or repair.
4. After repair or replacement, recheck with the
voltmeter to confirm that the repair has corrected
the problem.
.
TERMINAL RESISTANCE AND CONTINUITY
CHECKS
1. Turn the ignition switch to "OFF" position.
2. Disconnect the ECU connector.
CAUTION
If resistance and continuity checks are per-
formed on the wrong terminals, damage to the
vehicle wiring, sensors, ECU, and/or ohmmeter
may occur. Use care to prevent this!
3. Measure the resistance and check for continuity
between the terminals of the ECU harness-side
connector while referring to the check chart.
NOTE: Checks don't have to be carried out in the
order given in the chart.
4. If the ohmmeter shows any deviation from the
Normal Condition value, check the corresponding
sensor, actuator and related electrical wiring, then
repair or replace.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
TSB Revision
GENERAL <BODY AND CHASSIS>
00-8
5. After repair or replacement, recheck with the
ohmmeter to confirm that the repair has corrected
the problem.
.
10. INSPECTION PROCEDURES USING AN
OSCILLOSCOPE
When there are inspection procedures using an
oscilloscope, these are listed here.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
TSB Revision
GENERAL <BODY AND CHASSIS>
00-9
HOW TO USE THE INSPECTION
PROCEDURES
The causes of many of the problems occurring in
electric circuitry are generally the connectors, com-
ponents, the ECU, and the harnesses between con-
nectors, in that order. These inspection procedures
follow this order. They first try to discover a problem
with a connector or a defective component.
ACX00861AF
(1) Relevant circuit(s) of the component which
the DTC indicates are described.
(3) Shows the location of the connector(s) from
the circuit(s) above.
(4) Explains about the operation principle of the
component or its relevant parts in that circuit.
B-48 (B)
(2) For connector color, refer to GROUP 80A,
How to read configuration diagrams.
HOW TO USE TROUBLESHOOTING/INSPECTION SERVICE POINTS
TSB Revision
GENERAL <BODY AND CHASSIS>
00-10
.
HARNESS INSPECTION
Check for an open or short circuit in the harness
between the terminals which were faulty according to
the connector measurements. Carry out this inspec-
tion while referring to GROUP 00E, Harness Con-
nector Inspection
. Here, "Check harness
between power supply and terminal xx" also includes
checking for blown fuse. For inspection service
points when there is a blown fuse, refer to "Inspec-
tion Service Points for a Blown Fuse."
.
MEASURES TO TAKE AFTER REPLACING THE
ECU
If the trouble symptoms have not disappeared even
after replacing the ECU, repeat the inspection proce-
dure from the beginning.
AC210616
(5) Explains about technical details.
(6) Describes the conditions for that DTC
being set (stored).
(8) Start of the diagnosis procedure
for that DTC.
(10) Provides the inspection procedure
for that DTC step by step.
(7) Describes possible
cause(s)for that DTC.
(9) Identifies the special tool(s)
necessary for diagnosing that DTC.
AB
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