Mitsubishi Galant 9G. Manual — part 726
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-346
DTC SET CONDITIONS
Logic Flow Chart
.
Check Conditions
• 60 seconds have elapsed from the start of the
previous monitoring.
• Engine coolant temperature is higher than 20°C
(68
°F).
• While the cylinder 2, 3 heated oxygen sensor
(front) heater is on.
• Battery positive voltage is between 11 and 16.5
volts.
Judgment Criteria
• The cylinder 2, 3 heated oxygen sensor (front)
heater current has continued to be lower than
0.16 ampere or higher than 7.5 ampere for 4 sec-
onds.
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Procedure 6
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Open or shorted cylinder 2, 3 heated oxygen sen-
sor (front) heater circuit, or harness damage.
• Open circuit in cylinder 2, 3 heated oxygen sen-
sor (front) heater.
• Connector damage.
• PCM failed.
START
END
YES
YES
YES
YES
NO
NO
NO
NO
MALFUNCTION
GOOD
CONTINUOUS
FAILURE FOR 4secs
MONITORING
CONDITIONS
CURRENT
< 0.16A
CURRENT
> 7.5A
AK302023
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-347
DIAGNOSIS
Required Special Tools:
• MB991316: Test Harness
• MB991923: Check Harness
STEP 1. Check harness connector B-36 at the cylinder 2, 3
heated oxygen sensor (front) for damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 12.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-348
STEP 2. Check the cylinder 2, 3 heated oxygen sensor
(front).
(1) Disconnect cylinder 2, 3 heated oxygen sensor (front)
connector B-36 and connect test harness special tool,
MB991316, to the connector on the cylinder 2, 3 heated
oxygen (front) sensor side.
(2) Measure the resistance between heated oxygen sensor
connector terminal No. 1 (red clip) and terminal No. 3 (blue
clip).
Standard value: 4.5
− 8.0 ohms [at 20°C (68°F)]
Q: Is the measured resistance between 4.5 and 8.0 ohms
[at 20
°C (68°F)]?
YES : Go to Step 3.
NO : Replace the cylinder 2, 3 heated oxygen sensor
(front). Then go to Step 12.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01624 AB
MB991316
HEATED
OXYGEN
SENSOR
EQUIPMENT
SIDE
CONNECTOR
BLUE
RED
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-349
STEP 3. Measure the power supply voltage at cylinder 2, 3
heated oxygen sensor (front) harness side connector B-36.
(1) Disconnect the connector B-36 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Go to Step 4.
STEP 4. Check harness connector B-17X at the MFI relay
for damage.
Q: Is the harness connector in good condition?
YES : Repair harness wire between MFI relay connector
B-17X (terminal No. 4) and cylinder 2, 3 heated
oxygen sensor (front) connector B-36 (terminal No. 1)
because of open circuit or short circuit to ground.
Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
. Then go to Step 12.
AK303830
1
2
3
4
AB
CONNECTOR: B-36
B-36 (GR)
CYLINDER 2, 3
HEATED OXYGEN
SENSOR (FRONT)
HARNESS
CONNECTOR:
COMPONENT SIDE
AKX01496
B-36 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AY
AK303806
2
1
3
4
AB
CONNECTOR: B-17X
B-17X
RELAY BOX
TRIANGLE
MARK
HARNESS CONNECTOR:
COMPONENT SIDE
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