Mitsubishi Galant 9G. Manual — part 695
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-222
STEP 3. 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 P0132 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0133: Cylinder 1, 4 Heated Oxygen Sensor Circuit Slow Responce (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-223
.
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) rich/lean
switching frequency is under 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)
• 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)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-224
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 60°C
(140
°F).
• Engine speed is between 1,200 and 3,000 r/min.
• Volumetric efficiency is between 25 and 60 per-
cent.
• Under the closed loop air/fuel control.
• The accelerator pedal is open.
• Short-term fuel trim is between −25 and +25 per-
cent.
• More than 2 seconds have elapsed after the
above mentioned conditions have been met.
• The PCM monitors for this condition for 7 cycles
of 10 seconds each during the drive cycle.
Judgment Criteria
• The cylinder 1, 4 heated oxygen sensor (front)
sends "lean" and "rich" signals alternately 9 times
or less for 10 seconds. <Federal>
or
• The cylinder 1, 4 heated oxygen sensor (front)
sends "lean" and "rich" signals alternately 11
times or less for 10 seconds. <California>
NOTE: If the sensor switching frequency is lower
than the Judgment Criteria due to the MUT-III OBD-II
test Mode
−
H02S Test Results, it is assumed that
the heated oxygen sensor has deteriorated. If it is
higher, it is assumed that the harness is damaged or
has a short circuit.
If the heated oxygen sensor signal voltage has not
changed even once (lean/rich) after the DTC was
erased, the sensor switch time will display as 0 sec-
ond.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
.
F0: THRESHOLD VALUE FOR AVERAGE SWITCHING FREQUENCY
START
MONITORING
CONDITIONS
MALFUNCTION
GOOD
END
NO
NO
YES
YES
Ff < F0
CALCULATE AVERAGE SWITCHING
FREQUENCY (Ff) OVER SPECIFIED TIMES
AK302021
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-225
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Cylinder 1, 4 heated oxygen sensor (front) deteri-
orated.
• Connector damage.
• PCM failed.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991316: Test Harness
STEP 1. Using scan tool MB991958, check data list item 39:
Cylinder 1, 4 Heated Oxygen Sensor (front).
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) Start the engine and run at idle.
(3) Set scan tool MB991958 to the data reading mode for item
39, Cylinder 1, 4 Heated Oxygen Sensor (front).
(4) Warm up the engine, 2,500 r/min.
• Output voltage repeats 0.4 volt or less and 0.6 − 1.0 volt
10 times or more within 10 seconds.
(5) 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.
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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