Mitsubishi Galant (2004+). Manual — part 847
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-205
STEP 13. Check for short circuit to ground and harness
damage between cylinder 1, 4 heated oxygen sensor
(front) connector B-37 (terminal No. 4) and PCM connector
B-22 (terminal No. 92).
Q: Is the harness wire in good condition?
YES : Go to Step 14.
NO : Repair it. Then go to Step 15.
AK303821
1
2
3
4
AB
CONNECTOR: B-37
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
B-37 (GR)
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-206
STEP 14. Check the cylinder 1, 4 heated oxygen sensor
(front).
(1) Disconnect the cylinder 1, 4 heated oxygen sensor (front)
connector B-37 and connect test harness special tool
MB991316 to the connector on the cylinder 1, 4 heated
oxygen sensor (front) side.
(2) Warm up the engine until engine coolant temperature
reaches 80
°C (176°F) or higher.
(3) Perform a racing for 5 minutes or more with the engine
speed of 4,500 r/min.
(4) Connect a digital voltage meter between terminal No. 2
(black clip) and terminal No. 4 (white clip).
(5) While repeatedly revving the engine, measure the cylinder
1, 4 heated oxygen sensor (front) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wires;
incorrect connection can damage the heated oxygen
sensor (front).
• Be careful the heater is broken when voltage of beyond
8 volts is applied to the heated oxygen sensor (front)
heater.
NOTE: If the sufficiently high temperature [of approximate
400
°
C (752
°
F) or more] is not reached although the heated
oxygen sensor (front) is normal, the output voltage would be
possibly low although the rich air/fuel ratio. Therefore, if the
output voltage is low, use a jumper wire to connect the ter-
minal No. 1 (red clip) and the terminal No. 3 (blue clip) of
the heated oxygen sensor (front) with the positive terminal
and the negative terminal of 8 volts power supply respec-
tively, then check again.
Q: Is the measured voltage between 0.6 and 1.0 volt?
YES : Replace the PCM. Then go to Step 15.
NO : Replace the cylinder 1, 4 heated oxygen sensor
(front). Then go to Step 15.
AK303821
1
2
3
4
AB
CONNECTOR: B-37
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
B-37 (GR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MB991316
WHITE
BLACK
AN
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-207
STEP 15. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− OBD-II Drive Cycle − Procedure 6 −
Other Monitor
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0130 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0131: Cylinder 1, 4 Heated Oxygen Sensor Circuit Low Voltage (sensor 1)
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
52
51
53 54 55 56
57
58 59 60 61 62
63
64 65 66 67 68 69
70
71 72 73 74 75
76
77 78 79 80 81 82
83
AK303819
1
2
3
4
BLA
CK
BLUE
BLA
CK
TO PCM
FROM MFI RELAY
PINK
69
92
4
3
1
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
POWERTRAIN CONTROL
MODULE (PCM)
B-37
MU802665
2
B-22
Cylinder 1, 4 Heated Oxygen Sensor (front) Circuit
B-21
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-208
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 92) from the output terminal (terminal
No. 4) of the cylinder 1, 4 heated oxygen sensor
(front).
• Terminal No. 2 of the cylinder 1, 4 heated oxygen
sensor (front) is grounded with PCM (terminal
No. 69).
.
TECHNICAL DESCRIPTION
• The cylinder 1, 4 heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts those data to voltage,
and inputs the resulting signals to the PCM.
• When the cylinder 1, 4 heated oxygen sensor
(front) begins to deteriorate, the heated oxygen
sensor signal response becomes poor.
• The PCM forcibly varies the air/fuel mixture to
make it leaner and richer, and checks the
response speed of the cylinder 1, 4 heated oxy-
gen sensor (front). In addition, the PCM also
checks for an open circuit in the cylinder 1, 4
heated oxygen sensor (front) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Cylinder 1, 4 heated oxygen sensor (front) output
voltage stays low when air/fuel ratio is forced to
be rich. The above procedure is repeated when
oxygen sensor is inactive.
.
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)
• Heated oxygen sensor heater (front) monitor
• Misfire monitor
• Fuel system monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
• Throttle position sensor
• Accelerator pedal position sensor
.
AK303820AB
CONNECTOR: B-37
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (FRONT)
B-37 (GR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
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