Mitsubishi Galant 9G. Manual — part 1197

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1088

.

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.

AK303059

CONNECTOR: B-23

PCM

AB

AIR CLEANER

B-23

AK303166AB

CONNECTOR: B-116

B-116 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1089

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.

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

AK202954

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

AB

POWER PLANT ECU
CHECK HARNESS CONNECTOR

MB991923

PCM

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1090

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

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

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 by 0.2 − 3.5 volts.

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

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

malfunction symptom is eliminated.

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

AK203183AB

POWER PLANT ECU
CHECK HARNESS
CONNECTOR

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1091

STEP 2. Check harness connector B-23 at PCM connector
and harness connector B-116 at generator connector for
damage.
Q: Is the 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.

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

AK303168

2

1

3

4

AB

CONNECTOR: B-116

B-116 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE