Mitsubishi Galant 9G. Manual — part 733
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-374
STEP 14. Check the cylinder 2, 3 heated oxygen sensor
(rear).
(1) Disconnect the cylinder 2, 3 heated oxygen sensor (rear)
connector B-35 and connect test harness special tool
MD998464 to the connector on the cylinder 2, 3 heated
oxygen sensor (rear) 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
2, 3 heated oxygen sensor (rear) output voltage.
Standard value: 0.6
− 1.0 volt
CAUTION
• Be very careful when connecting the jumper wire;
incorrect connection can damage the right bank heated
oxygen sensor.
• Be careful the heater is broken when voltage of beyond
12 volts is applied to the heated oxygen sensor heater.
NOTE: If the sufficiently high temperature [of approximate
400
°
C (752
°
F) or more] is not reached although the heated
oxygen sensor is normal, the output voltage would be possi-
bly low although the rich air/fuel ratio. Therefore, if the out-
put voltage is low, use a jumper wire to connect the terminal
No. 1 (red clip) and the terminal No. 3 (blue clip) of the
heated oxygen sensor with the positive terminal and the
negative terminal of 12 volts power supply respectively,
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 2, 3 heated oxygen sensor
(rear). Then go to Step 15.
AK303835
1
2
3
4
AB
CONNECTOR: B-35
B-35 (B)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01624
HEATED
OXYGEN
SENSOR
COMPONENT
SIDE
CONNECTOR
MD998464
WHITE
BLACK
AL
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-375
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 −
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0156 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0157: Cylinder 2, 3 Heated Oxygen Sensor Circuit Low Voltage (sensor 2)
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
100
99
92
91
93 94 95
96 97 98
101 102 103 104
105 106 107 108
109 110 111 112 113
AK303833
1
2
3
4
GREEN
BLUE
BLA
CK
BLA
CK
TO PCM
FROM MFI RELAY
69
96
2
4
3
1
B-22
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
POWERTRAIN CONTROL
MODULE (PCM)
B-35
MU802605
Cylinder 2, 3 Heated Oxygen Sensor (rear) Circuit
B-21
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-376
.
CIRCUIT OPERATION
• A voltage corresponding to the oxygen concen-
tration in the exhaust gas is sent to the PCM (ter-
minal No. 96) from the output terminal (terminal
No. 4) of the cylinder 2, 3 heated oxygen sensor
(rear).
• Terminal No. 2 of the cylinder 2, 3 heated oxygen
sensor (rear) is grounded with PCM (terminal No.
69).
.
TECHNICAL DESCRIPTION
• The output signal of the cylinder 2, 3 heated oxy-
gen sensor (front) is compensated by the output
signal of the cylinder 2, 3 heated oxygen sensor
(rear).
• The PCM checks for an open circuit in the cylin-
der 2, 3 heated oxygen sensor (rear) output line.
.
DESCRIPTIONS OF MONITOR METHODS
Cylinder 2, 3 heated oxygen sensor (rear) 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
• Heated oxygen sensor heater (rear) monitor
• Air/fuel ratio feedback monitor
Sensor (The sensor below is determined to be
normal)
• Mass airflow sensor
• Engine coolant temperature sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK303834AB
CONNECTOR: B-35
B-35 (B)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (REAR)
AK303013
CONNECTORS: B-21, B-22
PCM
AB
AIR CLEANER
B-22 (B)
B-21 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-377
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• After 2 seconds or more pass from the time when
the monitor determines normally for detecting an
open circuit.
• Cylinder 2, 3 heated oxygen sensor (rear) signal
voltage has continued to be 0.15 volt or lower.
• Engine coolant temperature is higher than 76°C
(169
°F).
• Mass airflow sensor output is 6 g/sec or more.
• At least 20 seconds have passed since fuel shut
off control was canceled.
• Monitoring time: 8 seconds.
START
V
F
> =4.5V
2secs HAS PASSED
YES
YES
YES
NO
NO
NO
MALFUNCTION
MONITORING
CONDITIONS
YES
NO
MONITORING
CONDITIONS
+5V ON
AK401414
V
F
< 0.15V
8secs HAVE PASSED
YES
YES
NO
NO
END
MALFUNCTION
GOOD
MODULATE A/F CONDITION TO RICH
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