Mitsubishi Galant (2004+). Manual — part 1300
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-893
STEP 3. Measure the sensor supply voltage at accelerator
pedal position sensor harness side connector C-24.
(1) Disconnect the connector C-24 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 between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 7.
NO : Go to Step 4.
STEP 4. Check harness connector B-20 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
1
6 5 4 3 2
AK303203
C-24 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-894
STEP 5. Check for open circuit and short circuit to ground
between accelerator pedal position sensor connector C-24
(terminal No. 1) and PCM connector B-20 (terminal No. 30).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 11.
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-895
STEP 6. Using scan tool MB991958, check data list item 78:
Accelerator Pedal Position Sensor (main).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to the data reading mode for item
78, Accelerator Pedal Position Sensor (main).
• Output voltage is between 0.7 and 1.3 volts when foot is
released from accelerator pedal.
• Output voltage is 4.0 volts or higher when accelerator
pedal is fully depressed.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection. Service Points
.
NO : Replace the PCM. Then go to Step 11.
STEP 7. Check harness connector B-20 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 8.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 11.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-896
STEP 8. Check for harness damage between accelerator
pedal position sensor connector C-24 (terminal No. 1) and
PCM connector B-20 (terminal No. 30).
Q: Is the harness wire in good condition?
YES : Go to Step 9.
NO : Repair it. Then go to Step 11.
AK303202
1
6 5 4 3 2
ACCELERATOR
PERAL
AB
CONNECTOR: C-24
C-24 (B)
ACCELERATOR
PEDAL POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303092
25
21
24 23 22
29 28 27 26
34 33 32 31 30
38 37 36 35
43 42 41 40 39
CONNECTOR: B-20
B-20
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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