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Mitsubishi Outlander XL. Manual - part 408

ZK603650AA00

A-13

Connector: A-13

ZK603652 AA00

B-21 (B)

Connector: B-21

Intermediate
connector

ZK603589

MFI relay

A-33X

Connector: A-33X

AA00

ZK603641AA00

B-01(B)

B-04(B)

B-05(B)

B-15(B)

B-18(B)

B-19(B)

Connectors: B-01, B-04, B-05, B-15, B-18
and B-19

ZK603591

ECM

B-10 (GR)

Connector: B-10

AA00

CIRCUIT OPERATION

｠

The battery positive voltage is applied from the MFI
relay to the ignition coil (terminal No.3) and is
grounded to the vehicle body via the ignition coil
(terminal No.1).

｠

A power voltage of 12 V is applied to the ignition coil
(terminal No. 3) from the ECM (terminal No. 4, No.
5, No. 20, No. 21, No. 52 and No. 53).

COMMENT

｠

When the ECM turn the power transistor in the unit
to OFF, the battery positive voltage is applied to the
power transistor in the ignition coil, resulting that the
power transistor is ON. And, when the ECM turns
the power transistor in the unit to ON, the power
transistor in the ignition coil will be turned OFF.

｠

When the power transistor in the ignition coil is
turned to ON with any signal from the ECM, the
primary voltage will be applied through the ignition
coil.When the power transistor in the ignition coil is
turned OFF, the primary current is blocked and high
voltage is generated in the secondary coil.

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

｠

Malfunction of the ignition coil.

｠

Improper connector contact, open circuit or short-
circuit harness wire.

｠

Malfunction of the ECM.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-827

SYMPTOM PROCEDURES

DIAGNOSIS

STEP 1. Check the ignition coil.

(1)

Remove the intake manifold.

(2)

Refer to GROUP 16, Ignition System - On-vehicle service -
Ignition Coil Check P.16c-3.

Q:Are there any abnormalities?

YES:

Replace the ignition coil. Then confirm that the

malfunction symptom is eliminated.

NO:

Go to Step 2.

STEP 2. Check harness connectors harness connector B-10
at ECM and harness connector A-33X at MFI relay and B-01,
B-04, B-05, B-15, B-18, B-19 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.

STEP 3. Check the continuity at ignition coil connectors
B-01, B-04, B-05, B-15, B-18, B-19.

ZK603204AA00

B-01, B-04, B-05,
B-15, B-18, B-19
harness connector:
component side

(1)

Disconnect the connector B-01, B-04, B-05, B-15, B-18 and
B-19 measure at the harness side.

(2)

Check for the continuity between terminal No. 2 and ground.

｠

Should be less than 2 ohms.

Q:Does continuity exist?

YES:

Go to Step 4.

NO:

Check the connector B-21 at intermediate connector

for damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection P.00E-2. If
intermediate connector is in good condition, repair
harness wire between ignition coil connector ignition
coil connectors B-01, B-04, B-05, B-15, B-18 and B-19
(terminal No. 2) and ground because of open circuit or
harness damage. Then confirm that the malfunction symptom
is eliminated.

STEP 4. Check for open circuit and harness damage
between MFI relay connector and ignition coil connector.

NOTE:

Check harness after checking intermediate connectors

A-13 and B-21. If intermediate connectors are damaged,
repair or replace it. Refer to GROUP 00E, Harness Connector
Inspection. Then confirm that the malfunction symptom is
eliminated.

(1)

Disconnect the MFI relay connector and ignition coil
connector.

13Ab-828

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES

ZK603205AA00

A-33X harness

connector :
component side

B-01, B-04, B-05,
B-15, B-18, B-19
harness connector:
component side

(2)

Measure the resistance between MFI relay connector and
ignition coil connector.

a
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-01 (terminal No. 3) at ignition coil 1.

b
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-19 (terminal No. 3) at ignition coil 2.

c
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-04 (terminal No. 3) at ignition coil 3.

d
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-18 (terminal No. 3) at ignition coil 4.

e
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-05 (terminal No. 3) at ignition coil 5.

f
.

MFI relay connector A-33X (terminal No. 2) and ignition coil
connector B-15 (terminal No. 3) at ignition coil 6.

｠

Should be less than 2 ohms.

Q:Is the measured resistance less than 2 ohms?

YES:

Go to Step 5.

NO:

Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 5. Check for open circuit and harness damage
between ignition coil connector and ECM connector.

NOTE:

Check harness after checking intermediate connector

B-21. If intermediate connector is damaged, repair or
replace it. Refer to GROUP 00E, Harness Connector
Inspection. Then confirm that the malfunction symptom is
eliminated.

(1)

Disconnect the ignition coil connector and ECM connector.

16 15 14 13 12 11 10 9 8 7 6 5 4 3

32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17

48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

ZK603206

AA00

B-10 harness
connector:
component side

B-01, B-04, B-05,
B-15, B-18, B-19
harness connector:
component side

(2)

Measure the resistance between ignition coil connector and
ECM connector.

a
.

Ignition coil connector B-01 (terminal No. 2) and ECM
connector B-10 (terminal No. 4) at ignition coil 1.

b
.

Ignition coil connector B-19 (terminal No. 2) and ECM
connector B-10 (terminal No. 5) at ignition coil 2.

c
.

Ignition coil connector B-04 (terminal No. 2) and ECM
connector B-10 (terminal No. 20) at ignition coil 3.

d
.

Ignition coil connector B-18 (terminal No. 2) and ECM
connector B-10 (terminal No. 21) at ignition coil 4.

e
.

Ignition coil connector B-05 (terminal No. 2) and ECM
connector B-10 (terminal No. 52) at ignition coil 5.

f
.

Ignition coil connector B-15 (terminal No. 2) and ECM
connector B-10 (terminal No. 53) at ignition coil 6.

｠

Should be less than 2 ohms.

Q:Is the measured resistance less than 2 ohms?

YES:

Go to Step 6.

NO:

Repair it. Then confirm that the malfunction symptom

is eliminated.

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

13Ab-829

SYMPTOM PROCEDURES

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

NOTE:

Check harness after checking intermediate connectors

A-13 and B-21. If intermediate connectors are damaged,
repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection. Then
confirm that the malfunction symptom is eliminated.

(1)

Disconnect the ignition coil connector and ECM connector.

ZK603207AA00

B-01, B-04, B-05,
B-15, B-18, B-19
harness connector:
component side

(2)

Check for the continuity between ignition coil connector and
ground.

a
.

Ignition coil connector B-01 (terminal No. 1) and ground at
ignition coil 1.

b
.

Ignition coil connector B-19 (terminal No. 1) and ground at
ignition coil 2.

c
.

Ignition coil connector B-04 (terminal No. 1) and ground at
ignition coil 3.

d
.

Ignition coil connector B-18 (terminal No. 1) and ground at
ignition coil 4.

e
.

Ignition coil connector B-05 (terminal No. 1) and ground at
ignition coil 5.

f
.

Ignition coil connector B-15 (terminal No. 1) and ground at
ignition coil 6.

｠

Not continuity.

Q:Is the harness wire in good condition?

YES:

Replace the ECM. When the ECM is replaced, register

the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8.

NO:

Repair it. Then confirm that the malfunction symptom

is eliminated.

13Ab-830

MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>

SYMPTOM PROCEDURES

Content .. 406 407 408 409 ..