Mitsubishi Eclipse. Manual - part 629

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1059

STEP 8. Check for open circuit between distributor
connector B-22 (terminal No. 2) and engine speed
detection connector A-12X (terminal No. 1).
Q: Is the harness wire in good condition?

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

AK300439

B-22 (B)

CONNECTOR: B-22

HARNESS CONNECTOR:
COMPONENT SIDE

AK300747

CONNECTOR: A-12X

A-12X

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1060

INSPECTION PROCEDURE 34: A/C system.

COMMENT

• When the A/C is "ON", the battery positive volt-

age is applied on the ECM (terminal 83) <M/T>
PCM (terminal 83) <A/T> from the automatic
compressor controller.
When battery positive voltage is applied to the
ECM <M/T> or PCM <A/T>, the ECM <M/T> or
PCM <A/T> turns "ON" the power transistor in the
ECM <M/T> or PCM <A/T>. The ECM <M/T> or
PCM <A/T> delays A/C engagement momentarily
while it increases idle rpm. Then the A/C com-
pressor clutch relay coil will be energized.

With this, the A/C compressor clutch relay turns
"ON", and the A/C compressor clutch functions.

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

• Malfunction of the A/C control system.

• Malfunction of the A/C switch.

• Improper connector contact, open circuit or

short-circuited harness wire.

• Malfunction of the ECM <M/T> or PCM <A/T>.

AK000721

GREEN-

RED

GREEN

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

83 <M/T>*2
83 <A/T>*4

20 <M/T>*1
20 <A/T>*3

A/C COMPRESSOR
RELAY

NOTE
*1:ECM connector C-51 <M/T>
*2:ECM connector C-62 <M/T>
*3:PCM connector C-52 <A/T>
*4:PCM connector C-59 <A/T>

AUTOMATIC
COMPRESSOR
CONTROLLER

88 89

76 77

72
79
91

73
80

81
92

82 83
93

84 85

86 87

95 96

100

76 77

72
79

C-62 <M/T>
(MU803783)

C-59 <A/T>
(MU803782)

C-51 <M/T>, C-52 <A/T>

(MU803784)

3 4

5 6

7 8

11 12 13 14 15 16 17 18 19 20

21 22 23

24 25

26 27 28 29

3132 33

34 35

A/C Circuit

AK000225

CONNECTORS : C-51, C-62<M/T>,
C-52, C-59<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

C-59

C-62

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1061

DIAGNOSIS

STEP 1. Check connector C-51, C-62 at ECM <M/T> or
connector C-52, C-59 at PCM <A/T> for damage.
Q: Is the connector in good condition?

YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 2. Check the circuit at ECM connector C-51 <M/T> or
PCM connector C-52 <A/T>.
(1) Disconnect the connectors C-51 <M/T> or C-52 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 20 and ground.

• Voltage should be battery positive voltage.

(4) Using a jumper wire, connect terminal 20 to ground.

• A/C compressor relay should turn "ON".

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage and A/C compressor relay condition

normal?
YES : Go to Step 3.
NO : Refer to GROUP 55, Diagnosis

− Introduction To

Heater, Air Conditioning And Ventilation Diagnosis

P.55-4

. Then confirm that the malfunction symptom is

eliminated.

AK000225

CONNECTORS : C-51, C-62<M/T>,
C-52, C-59<A/T>

C-52

C-51

PCM<A/T>

ECM<M/T>

C-59

C-62

AKX01448 AH

19 20 21

C-51<M/T>,C-52<A/T>
HARNESS SIDE
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-1062

STEP 3. Check the circuit at ECM connector C-62 <M/T> or
PCM connector C-59.
(1) Disconnect the connectors C-62 <M/T> or C-59 <A/T> and

measure at the harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 83 and ground.

• Voltage should be 1 volt or less when the A/C switch is

"OFF".

• Voltage should be battery positive voltage when the A/C

switch is "ON".

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

YES : Replace the ECM or PCM. Then confirm that the

malfunction symptom is eliminated.

NO : Refer to GROUP 55, Diagnosis

− Introduction To

Heater, Air Conditioning And Ventilation Diagnosis

P.55-4

DATA LIST REFERENCE TABLE

M1131152000876

CAUTION

• When shifting the select lever to D range, the brakes should be applied so that the vehicle does

not move forward.

• Driving tests always need two persons: one driver and one observer.

NOTE: Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second close to the engine.
NOTE: Bank 1 indicates the right bank cylinder, and bank 2 indicates the left bank cylinder.
NOTE:

*1:

If the idle speed is lower than the standard value on a very cold engine [approximately -20

(-4

F)] even when the IAC motor is fully opened, the air volume limiter built in the throttle body could be

defective.
NOTE:

*2:

In a new vehicle [driven approximately 500 km (311 mile) or less], the step of the stepper motor is

sometimes 30 steps greater than the standard value.
NOTE:

*3:

The injector drive time represents the time when the cranking speed is at 250 r/min or below when

the power supply voltage is 11 volts.
NOTE:

*4:

In a new vehicle [driven approximately 500 km (311 mile) or less], the injector drive time is some-

times 10% longer than the standard time.
NOTE:

: In a new vehicle [driven approximately 500 km (311 mile) or less], the volume airflow sensor output

frequency is sometimes 10% higher than the standard frequency.
NOTE:

: Applicable to GST

AK000389

100

C-62 HARNESS
SIDE CONNECTOR

<M/T>

AKX01449

<A/T>

C-59 HARNESS
SIDE CONNECTOR

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