Mitsubishi Outlander GS45X. Manual - part 1191

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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HOW TO USE TROUBLESHOOTING/

INSPECTION SERVICE POINTS

TROUBLESHOOTING CONTENTS

M1001013300642

DANGER

The SRS-ECU adopts the rollover specifica-
tion that the curtain airbag and seat belt 
pre-tensioner operate at the occurrence of 
rollover. Therefore, do not tilt the vehicle to 
the right and left with the IG ON or tilt the 
SRS-ECU to the right and left with the IG ON 
and the harness installed.

CAUTION

During diagnosis, a diagnostic trouble code 
associated with other system may be set when 
the ignition switch is turned "ON" with connec-
tor(s) disconnected. On completion, confirm all 
systems for diagnostic trouble code(s). If diag-
nostic trouble code(s) are set, erase them all.

WARNING

Since the radiator fan rotates during CAN 
bus line diagnostics, make sure that no one 
is servicing the engine compartment before 
diagnosing the CAN bus line. Since the CAN 
communication stops when diagnosing the 
CAN bus line, the ETACS-ECU detects the 
time-out of the engine control module, and 
activates the radiator fan to prevent over-
heating as fail-safe. 

Troubleshooting of electronic control systems for 
which scan tool MB991958 can be used follows the 
basic outline described below. Even in systems for 
which scan tool MB991958 cannot be used, some of 
these systems still follow this outline.

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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1. STANDARD FLOW OF DIAGNOSTIC TROUBLESHOOTING

Troubleshooting sections are based on the diagnos-
tic flow as below. If the diagnostic flow is different 
from that given below, or if additional explanation is 
required, the details of such differences or additions 
will also be listed.

Diagnostic method

• *

1

: For how to diagnose CAN bus lines, refer to 

GROUP 54C 

P.54C-10

.

• *

2

: For the CAN bus diagnosis chart, refer to 

GROUP 54C 

P.54C-17

.

• *

3

: When scan tool MB991958 detects a diagnos-

tic trouble code, its display informs users whether 
a mechanical problem currently exists or whether 
it existed before. The message for the former 
state identifies it as an "Active" and the message 
for the latter identifies it as a "Stored".

• *

4

: For how to treat past trouble, refer to 

P.00-17

.

• *

5

: For how to cope with intermittent malfunc-

tions, refer to 

P.00-15

.

• *

6

: For coding data, refer to 

P.00-44

.

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

AC704160

Gathering information 
from the customer

Reoccurs

Does not reoccur

Read the diagnosis code.

After taking note of the 
malfunction code, erase the 
diagnosis cod memory.

Recheck trouble symptom.

How to treat past 
trouble.*

4

INTERMITTENT MALFUNCTIONS

*

OK

NG

5

Coding data check*

6

Check trouble symptom

CAN bus diagnosis chart *

2

CAN bus diagnosis.*

1

Read the diagnosis code.

No diagnosis 
code.

No diagnosis 
code or 
communication 
with scan tool 
MB991958 not
possible.

How to treat past 
trouble*

4

Read the diagnosis code.

Refer to the INSPECTION CHART
FOR TROUBLE SYMPTOMS
(Refer to applicable group).

diagnosis code 
displayed.
(Current trouble)*

3

diagnosis  code 
displayed.
(Current trouble)*

3

diagnosis code 
displayed.
(Current trouble)*

3

diagnosis code 
displayed.
(Current trouble)*

3

No diagnosis 
code.

diagnosis  code 
displayed.

Refer to the INSPECTION CHART
FOR DIAGNOSIS CODES
(Refer to applicable group).

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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4. DIAGNOSTIC TROUBLE CODE CHART

If the scan tool displays a diagnostic trouble code, 
find the applicable inspection procedure according to 
this chart.

5. SYMPTOM CHART

If there are symptoms, even though the scan tools 
show that no DTCs are set, inspection procedures 
for each symptom will be found by using this chart.

6. DIAGNOSTIC TROUBLE CODE 
PROCEDURES

Indicates the inspection procedures corresponding to 
each diagnostic trouble code. (Refer to 

P.00-10

).

7. SYMPTOM PROCEDURES

Indicates the inspection procedures corresponding to 
each symptom listed in the Symptom Chart. (Refer to 

P.00-10

).

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. Replace or repair as needed.

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 the  "LOCK" (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.

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.

HOW TO USE TROUBLESHOOTING/ INSPECTION SERVICE POINTS

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GENERAL

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HOW TO USE THE INSPECTION PROCEDURES

M1001013500550

The causes of many of the problems occurring in electric circuitry are generally the connectors, components, 
the ECU, and the harnesses between connectors, in that order. These inspection procedures follow this 
order. They first try to discover a problem with a connector or a defective component.

AC610770

Intake air temperature circuit malfunction

Intake air temperature sensor
(Incorporated in volume air 
 flow sensor)

Powertrain
control
module (PCM)

Connector: B-48

Intake air

temperature

sensor

AB

(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.

Intake Air Temperature Circuit Malfunction