Mitsubishi Galant (2004+). Manual - part 1049

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1013

INSPECTION PROCEDURE 25: Pressure Test of the Evaporative System Failure

.

COMMENT

• The test fails if there is a leak from the fuel tank or 

vapor line.

.

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

• Loose fuel tank filler tube cap.

• Broken seal in fuel tank, vapor line evaporative 

emission canister.

DIAGNOSIS

STEP 1. Check the evaporative emission purge solenoid.
Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission Purge Solenoid Check 

P.17-89

.

Q: Is the evaporative emission purge solenoid normal?

YES : Go to Step 2.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 2. Check the evaporative emission ventilation 
solenoid.
Refer to GROUP 17, Emission Control System 

− Evaporative 

Emission Ventilation Solenoid Check 

P.17-90

.

Q: Is the evaporative emission ventilation solenoid 

normal?
YES : Check the following items, and repair or replace the 

defective items.

a. Check for leaks from the vapor line or 

evaporative emission canister.

b. Check for leaks from the fuel tank.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1014

INSPECTION PROCEDURE 26: Generator output voltage is low (approximately 12.3 volts).

.

CIRCUIT OPERATION

• The PCM controls generator out put current by 

duty-controlling continuity between the generator 
G terminal (terminal No. 1) and ground.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this charging system:)

• Malfunction of the charging system.

• Short circuit in harness between generator G ter-

minal and PCM.

• PCM failed.

4

3

2

1

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128 129 130 131 132 133

134 135 136 137 138 139 140

141 142 143 144 145 146

147 148 149 150 151 152 153

AK303921

BLA

CK-RED

POWERTRAIN CONTROL
MODULE (PCM)

GENERATOR

VOLTAGE
REGULATOR

B-116

(MU802046)

1

132

B-23

Generator Circuit

AK303059

CONNECTOR: B-23

PCM

AB

AIR CLEANER

B-23

AK303883AB

CONNECTOR: B-116

B-116 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1015

DIAGNOSIS

Required Special Tool:

• MB991923: Power Train ECU Check Harness

STEP 1. Measure the voltage at PCM connector B-23 by 
using check harness special tool MB991923.
(1) Disconnect the all PCM connectors and connect check 

harness special tool MB991923 between the separated 
connectors.

(2) Start the engine and run at idle.

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133 132 131 130 129 128

140 139 138 137 136 135 134

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153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER

AK202954

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133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AB

POWER PLANT ECU 
CHECK HARNESS CONNECTOR

MB991923

PCM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1016

(3) Measure the voltage between terminal No. 132 and ground.

NOTE: Vehicle for Canada, the headlight, taillight, etc. 
remain lit even when the lighting switch is in "OFF" position 
but this is no problem for checks.

a. Engine: warming up
b. Radiator fan: stopped

c. Headlight switch: OFF to ON

d. Rear defogger switch: OFF to ON
e. Stoplight switch: OFF to ON

• Voltage rises.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage within the specified range?

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

malfunction symptom is eliminated.

STEP 2. Check harness connector B-23 at PCM connector 
and harness connector B-116 at generator connector 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.

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133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK203183AB

POWER PLANT ECU 
CHECK HARNESS 
CONNECTOR 

127 126 125 124 123 122 121

133 132 131 130 129 128

140 139 138 137 136 135 134

146 145 144 143 142 141

153 152 151 150 149 148 147

AK303058

HARNESS CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-23

B-23

PCM

AB

AIR CLEANER

AK303884

2

1

3

4

AB

CONNECTOR: B-116

B-116 (GR)

HARNESS 
CONNECTOR: 
COMPONENT SIDE