Mitsubishi Galant 9G. Manual - part 1207

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1128

STEP 3. Measure the power supply voltage at ignition coil
connectors B-114, B-117, B-118, B-102, B-103, B-101.
(1) Disconnect the connector B-114, B-117, B-118, B-102,

B-103, B-101 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 be 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 5.
NO : Go to Step 4.

STEP 4. Check for open circuit between ignition switch
connector C-308 (terminal No. 2) and ignition coil
connectors B-114, B-117, B-118, B-102, B-103, B-101
(terminal No. 1).

AK303233

B-118 (GR)

B-102 (GR)

B-101 (GR)

B-117 (GR)

B-103 (GR)

B-114 (GR)

CONNECTOR: B-101, B-102, B-103, B-114,
B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

AK303273

B-101, B-102, B-103, B-114,
B-117, B-118 HARNESS
CONNECTOR:
COMPONENT SIDE

AK203282

CONNECTOR: C-308

C-308

HARNESS
CONNECTOR:
COMPONENT SIDE

AK303233

B-118 (GR)

B-102 (GR)

B-101 (GR)

B-117 (GR)

B-103 (GR)

B-114 (GR)

CONNECTOR: B-101, B-102, B-103, B-114,
B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1129

NOTE: Check harness after checking intermediate connectors
A-13, B-32, C-29, C-211, C-215 and C-308. If intermediate con-
nectors are damaged, repair or replace them. Refer to GROUP
00E, Harness Connector Inspection

P.00E-2

. Then confirm that

the malfunction symptom is eliminated.
Q: Is the harness wire in good condition?

YES : Repair harness wire between ignition switch

connector C-308 (terminal No. 2) and capacitor
connector B-111 (terminal No. 1) because of short
circuit to ground. Then confirm that the malfunction
symptom is eliminated.

NO : Repair it. Then confirm that the malfunction symptom

is eliminated.

STEP 5. Check the circuit at ignition coil harness side
connectors B-114, B-117, B-118, B-102, B-103, B-101.
(1) Disconnect the connectors B-114, B-117, B-118, B-102,

B-103, B-101 and measure at the harness side.

(2) Crank the engine.

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

NOTE: The average voltage through an analog voltmeter is
described in this service manual (because the average volt-
age is too stable to be shown on a digital voltmeter).

• Voltage should be 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 8.
NO : Go to Step 6.

AK303233

B-118 (GR)

B-102 (GR)

B-101 (GR)

B-117 (GR)

B-103 (GR)

B-114 (GR)

CONNECTOR: B-101, B-102, B-103, B-114,
B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

AK303275

B-101, B-102, B-103, B-114,
B-117, B-118 HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1130

STEP 6. Check connector B-23 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 7.
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

AIR CLEANER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-1131

STEP 7. Check for open circuit and short circuit to ground
between ignition coil connector and PCM connector.

AK303233

B-118 (GR)

B-102 (GR)

B-101 (GR)

B-117 (GR)

B-103 (GR)

B-114 (GR)

CONNECTOR: B-101, B-102, B-103, B-114,
B-117, B-118

HARNESS CONNECTOR:
COMPONENT SIDE

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

AIR CLEANER

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