Mitsubishi Galant 9G. Manual — part 680
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-162
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991658: Test Harness
STEP 1. Using scan tool MB991958, check data list item 79:
Throttle 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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only
terminals No. 3, No. 4, No. 5, and No. 6.
(6) Set scan tool MB991958 to the data reading mode for item
79, Throttle Position Sensor (main).
• Output voltage should be between 0.3 and 0.7 volt when
the throttle valve is fully closed with your finger.
• Output voltage should be between 4.0 volts or more
when the throttle valve is fully open with your finger.
(7) 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
− How to
Cope with Intermittent Malfunctions
.
NO : Go to Step 2.
STEP 2. Check harness connector B-06 at throttle position
sensor 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
. Then go to Step 11.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303818
1
6 5 4 3 2
AB
CONNECTOR: B-06
B-06 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-163
STEP 3. Measure the sensor supply voltage at throttle
position sensor harness side connector B-06.
(1) Disconnect the connector B-06 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 5 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-22 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
. Then go to Step 11.
AK303818
1
6 5 4 3 2
AB
CONNECTOR: B-06
B-06 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
1
6 5 4 3 2
AK203049
B-06 HARNESS
CONNECTOR:
COMPONENT SIDE
AC
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-164
STEP 5. Check for open circuit and short circuit to ground
between throttle position sensor connector B-06 (terminal
No. 5) and PCM connector B-22 (terminal No. 94).
Q: Is the harness wire in good condition?
YES : Go to Step 6.
NO : Repair it. Then go to Step 11.
AK303818
1
6 5 4 3 2
AB
CONNECTOR: B-06
B-06 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-165
STEP 6. Using scan tool MB991958, check data list item 79:
Throttle 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) Detach the intake air hose at the throttle body.
(4) Disconnect the connector of the throttle position sensor.
(5) Use test harness special tool (MB991658) to connect only
terminals No. 3, No. 4, No. 5, and No. 6.
(6) Set scan tool MB991958 to the data reading mode for item
79, Throttle Position Sensor (main).
• Output voltage should be between 0.3 and 0.7 volt when
the throttle valve is fully closed with your finger.
• Output voltage should be 4.0 volts or more when the
throttle valve is fully open with your finger.
(7) 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
− How to
Cope with Intermittent Malfunctions
.
NO : Replace the PCM. Then go to Step 11.
STEP 7. Check harness connector B-22 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
. Then go to Step 11.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AK303016
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTOR: B-22
B-22 (B)
PCM
AB
HARNESS CONNECTOR:
COMPONENT SIDE
AIR CLEANER
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