Mitsubishi Montero (2002-2004). Manual — part 624

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-193

STEP 3. Measure the sensor output voltage at PCM
connector D-135 by backprobing.
(1) Do not disconnect the connector D-135.
(2) Start the engine and run at idle.

(3) Measure the voltage between terminal No. 108 and ground

by backprobing.

• Warming up the engine. When the engine is 2,500 r/min,

the output voltage should repeat 0 to 0.8 volt alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 4.
NO : Go to Step 6.

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CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

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D-135 HARNESS
CONNECTOR:
HARNESS SIDE

AB

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-194

STEP 4. Check harness connector B-26 at left bank heated
oxygen sensor (front) and harness connector D-135 at
PCM for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 15.

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CONNECTOR: B-26

B-26(GR)

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

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CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-195

STEP 5. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item

11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).

• Warming up the engine. When the engine is revved, the

output voltage should be 0.6 to 1.0 volt.

• Warming up the engine. When the engine is idling, the

output voltage should repeat 0.4 volt and 0.6 to 1.0 volt
alternately.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points

P.00-6

.

NO : Replace the PCM. Then go to Step 15.

ACX01539

16-PIN

MB991502

AC

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DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-196

STEP 6. Check harness connector B-26 at left bank heated
oxygen sensor (front) and harness connector D-135 at
PCM for damage.
Q: Is the harness connector in good condition?

YES : Repair harness wire between left bank heated oxygen

sensor (front) connector B-26 (terminal No. 4) and
PCM connector D-135 (terminal No. 108) because of
open circuit or harness damage. Then go to Step 15.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 15.

AK201278

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CONNECTOR: B-26

B-26(GR)

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

RIGHT BANK
HEATED OXYGEN
SENSOR (FRONT)

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CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)