Mitsubishi Galant 9G. Manual — part 710
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-282
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• Engine coolant temperature is higher than 76°C
(169
°F).
• The cylinder 1, 4 heated oxygen sensor (front) is
active.
• The cumulative mass airflow sensor output is
higher than 1,638 g.
• Repeat 3 or more times: drive
*1
, stop
*2
.
Drive
*1
:
• Engine speed is higher than 1,500 r/min.
• Volumetric efficiency is higher than 40 per-
cent.
• Vehicle speed is higher than 30 km/h (19
mph).
• A total of more than 10 seconds have
elapsed with the above mentioned condi-
tions, and more than 2 seconds have
elapsed with the fuel shut off.
Stop
*2
:
• Vehicle speed is lower than 1.5 km/h (1
mph).
END
YES
NO
NO
NO
START
MONITORING
CONDITION
YES
MALFUNCTION
GOOD
OUTPUT VOLTAGE
CHANGE < 0.313 V <FEDERAL> OR
0.234 V <CALIFOLNIA>
GO/STOP OPERATION
FOR SPECIFIED TIMES
YES
AK304256
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-283
Judgement Criteria
• Change in the output voltage of the cylinder 1, 4
heated oxygen sensor (rear) is lower than 0.313
volt. <Federal>
or
• Change in the output voltage of the cylinder 1, 4
heated oxygen sensor (rear) is lower than 0.234
volt. <California>
NOTE: Monitoring stops after fuel has been shut
off for more than 38 seconds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 4
− Heated Oxygen Sensor Monitor
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Cylinder 1, 4 heated oxygen sensor (rear) 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
• MD998464: Test Harness
STEP 1. Using scan tool MB991958, check data list item 69:
Cylinder 1, 4 Heated Oxygen Sensor (rear).
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
69, Cylinder 1, 4 Heated Oxygen Sensor (rear).
(4) Warm up the engine.
• After increasing the output voltage 0.15 volt or more by
the engine revving, finish it. Then confirm that the output
voltage reduces to 0.15 volt or less within 3 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 : Replace the heated oxygen sensor (rear). Then go to
AK303804AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-284
STEP 2. Check the cylinder 1, 4 heated oxygen sensor
(rear).
(1) Disconnect the cylinder 1, 4 heated oxygen sensor (rear)
connector B-38 and connect test harness special tool
MD998464 to the connector on the cylinder 1, 4 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
1, 4 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 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 : Go to Step 3.
NO : Replace the cylinder 1, 4 heated oxygen sensor
(rear). Then go to Step 4.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
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-285
STEP 3. Check harness connector B-38 at cylinder 1, 4
heated oxygen sensor (rear) and harness connector B-21,
B-22 at PCM for damage.
Q: Is the harness connector in good condition?
YES : Replace the PCM.Then go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 4.
AK303826
1
2
3
4
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-38
B-38 (B)
CYLINDER 1, 4
HEATED OXYGEN
SENSOR (REAR)
AK303052
55
56
54 53 52 51
57
62 61 60 59 58
63
69 68 67 66 65 64
70
75 74 73 72 71
76
82 81 80 79 78 77
83
104
96
94
95
93 92 91
99 98 97
103 102 101 100
108 107 106 105
113 112 111 110 109
CONNECTORS: B-21, B-22
AB
B-21 HARNESS CONNECTOR:
COMPONENT SIDE
B-22 HARNESS CONNECTOR:
COMPONENT SIDE
PCM
AIR CLEANER
B-22 (B)
B-21 (B)
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