Mitsubishi Montero (2002-2004). Manual — part 763

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SYMPTOM PROCEDURES

13Ad-101

.

TROUBLESHOOTING HINTS (The most likely
causes for this case: )

• Malfunction of the ignition coil.

• Malfunction of the ignition power transistor.

• Improper connector contact, open circuit or short-

circuited harness wire.

• Malfunction of the PCM.

DIAGNOSIS

STEP 1. Check the ignition coil.
Refer to GROUP 16, Ignition System

− On-vehicle service −

Ignition Coil Check

P.16-29

.

Q: Are there any abnormalities?

YES : Go to Step 2.
NO : Replace the ignition coil. Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check harness connectors B-31, B-32, B-34 at
ignition coil for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK201291

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

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SYMPTOM PROCEDURES

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STEP 3. Measure the power supply voltage at ignition coil
connectors B-31, B-32, B-34.
(1) Disconnect the connector B-31, B-32, B-34 and measure at

the harness side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should measure battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 4.
NO : Check the connectors D-208, D-221, E-111 at

intermediate connectors for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection

P.00E-2

. If intermediate

connector are in good condition, repair harness wire
between ignition switch connector D-204 (terminal
No. 2) and ignition coil connector B-31, B-32, B-34
(terminal No. 1) because of open circuit. Then confirm
that the malfunction symptom is eliminated.

STEP 4. Check the circuit at ignition coil harness side
connectors B-31, B-32, B-34.
(1) Disconnect the connectors B-31, B-32, B-34 and measure

at the harness side.

(2) Engine cranking.

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

• Voltage should measure 0.3 and 3.0 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 0.3 and 3.0 volts?

YES : Go to Step 7.
NO : Go to Step 5.

AK201291

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000414AI

B-31, B-32, B-34 HERNESS
CONNECTORS:
COMPONENT SIDE

1

2

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AK201291

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

AK000415 AJ

B-31, B-32, B-34 HERNESS
CONNECTORS:
COMPONENT SIDE

1

2

3

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SYMPTOM PROCEDURES

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STEP 5. Check connector D-133 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 6. Check for open circuit and short circuit to ground
between ignition coil connector and PCM connector.

a. Check the harness wire between ignition coil connector B-

32 (terminal No. 3) and PCM connector D-133 (terminal No.
31) when checking ignition coil 1.

b. Check the harness wire between ignition coil connector B-

34 (terminal No. 3) and PCM connector D-133 (terminal No.
35) when checking ignition coil 2.

c. Check the harness wire between ignition coil connector B-

31 (terminal No. 3) and PCM connector D-133 (terminal No.
44) when checking ignition coil 3.

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then confirm that the malfunction

symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK200939

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AB

CONNECTOR: D-133

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-133(GR)

AK201291

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

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CONNECTOR: D-133

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-133(GR)

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SYMPTOM PROCEDURES

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STEP 7. Check for harness damage between ignition coil
connector and PCM connector.

a. Check the harness wire between ignition coil connector B-

32 (terminal No. 3) and PCM connector D-133 (terminal No.
31) when checking ignition coil 1.

b. Check the harness wire between ignition coil connector B-

34 (terminal No. 3) and PCM connector D-133 (terminal No.
35) when checking ignition coil 2.

c. Check the harness wire between ignition coil connector B-

31 (terminal No. 3) and PCM connector D-133 (terminal No.
44) when checking ignition coil 3.

Q: Is the harness wire in good condition?

YES : Go to Step 8.
NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 8. Check for continuity at ignition coil harness side
connectors B-31, B-32, B-34.
(1) Disconnect the connectors B-31, B-32, B-34 and measure

at the harness side.

(2) Check for continuity between terminal No. 2 and ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 9.
NO : Repair harness wire between ignition coil connectors

B-31, B-32, B-34 (terminal No. 2) and ground
because of open circuit or harness damage. Then
confirm that the malfunction symptom is eliminated.

AK201291

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2

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

AK200939

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CONNECTOR: D-133

HARNESS CONNECTOR:
COMPONENT SIDE

PCM

D-133(GR)

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B-31(GR)

B-32(GR)

B-34(GR)

AB

CONNECTORS: B-31, B-32, B-34

HARNESS
CONNECTOR:
COMPONENT SIDE

AK101265

1

2

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AI

B-31, B-32, B-34 HERNESS
CONNECTORS:
COMPONENT SIDE

1

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