Mitsubishi Galant 9G. Manual — part 847
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-830
DTC P0642: Throttle Position Sensor Power Supply
.
TECHNICAL DESCRIPTION
• PCM checks the throttle position sensor power
voltage for abnormal conditions.
.
DESCRIPTIONS OF MONITOR METHODS
Throttle position sensor source voltage is smaller
than the specified value.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITIONS
Check Conditions
• Battery positive voltage is higher than 6.3 volts.
Judgement Criteria
• Throttle position sensor power voltage should be
4.1 volts or less for 0.5 second.
.
OBD-II DRIVE CYCLE PATTERN
None.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• PCM failed.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-831
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P0642 set?
YES : Replace the PCM.
NO : 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
.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-832
DTC P0657: Throttle Actuator Control Motor Relay Circuit Malfunction
CAUTION
If DTC P0657 has been set, TCL related DTC
U1120 is also set. After P0657 has been diag-
nosed, don't forget to erase DTC U1120.
1
2
3
4
1
2
3
4
1 2
3 4 5
14
15
8 9
12 13
6 7
10 11
16 17
AK400896
121 122 123 124 125 126 127
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
THROTTLE ACTUATOR
CONTROL MOTOR RELAY
THROTTLE ACTUATOR
CONTROL MOTOR
POWER SOURCE
B-17X
B-14X
A-13
RED-BLUE
RED-
WHITE
RED-
WHITE
RED-
WHITE
RED-
WHITE
BLUE-WHITE
TO PCM
TO PCM
MFI
RELAY
RED
RED
RED
BATTERY
Throttle Actuator Contorol Motor Relay Circuit
2
1
5
3
4
2
1
3
4
123
122
POWERTRAIN
CONTROL
MODULE (PCM)
B-23
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-833
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the throttle
actuator control motor relay terminal (terminal
No. 1).
• Battery positive voltage is applied to the throttle
actuator control motor relay terminal (terminal
No. 2) from the MFI relay (terminal No. 4).
• PCM (terminal No. 123) applies current to the
throttle actuator control motor relay coil by turning
ON the power transistor in the unit in order to turn
the relay ON.
• When the throttle actuator control motor relay
turns ON, battery positive voltage is supplied by
the throttle actuator control motor relay (terminal
No. 4) to the PCM (terminal No. 122).
.
TECHNICAL DESCRIPTION
• When the ignition switch ON signal is input into
the PCM, the PCM turns ON the throttle actuator
control motor relay.
.
DESCRIPTIONS OF MONITOR METHODS
Throttle actuator control motor relay circuit voltage is
smaller than the specified value.
.
MONITOR EXECUTION
Continuous
.
MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Not applicable
Sensor (The sensor below is determined to be
normal)
• Not applicable
.
DTC SET CONDITIONS
Check Condition
• Battery positive voltage is higher than 8.3 volts.
Judgement Criteria
• The power line voltage of the electronic controlled
throttle valve system should be 6.0 volts or less
for 0.35 second.
.
AK303872AB
A-13 (GR)
CONNECTOR: A-13
AK303886AB
CONNECTOR: B-14X
THROTTLE
ACTUATOR
CONTROL
MOTOR RELAY
B-14X
AK303803AB
CONNECTOR: B-17X
MFI RELAY
B-17X
AK303059
CONNECTOR: B-23
PCM
AB
AIR CLEANER
B-23
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