Mitsubishi Galant. Manual - part 234
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-161
STEP 1. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
(4) Warm up the engine, 2500r/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(
).
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 2.
STEP 2. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to,
Procedure 6
−
Other Monitor(
(2) Check the diagnostic trouble code (DTC).
Q: Is the DTC P0153 is output?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0154: O
2
Sensor Circuit No Activity Detected (bank 2 sensor 1)
O
2
SENSOR CIRCUIT NO ACTIVITY DETECTED
(BANK 2 SENSOR 1) CIRCUIT
•
Refer to, DTC P0150
−
Left Bank Heated Oxygen
Sensor (front) Circuit (
).
•
Refer to, DTC P0202, P0204, P0206
−
Injector
Circuit (
CIRCUIT OPERATION
•
Refer to, DTC P0150
−
Left Bank Heated Oxygen
Sensor (front) Circuit (
).
•
Refer to, DTC P0202, P0204, P0206
−
Injector
Circuit (
TECHNICAL DESCRIPTION
•
The left bank heated oxygen sensor (front)
detects the concentration of oxygen in the
exhaust gas; it converts that data to voltage, and
sends it to the PCM.
•
When the left bank heated oxygen sensor (front)
begins to deteriorate, the heated oxygen sensor
signal response deteriorates also.
•
The PCM varies the air/fuel mixture to make it
leaner and richer, and checks the response
speed of the left bank heated oxygen sensor
(front). In addition, the PCM also checks for an
open circuit in the left bank heated oxygen sensor
(front) output line.
DTC SET CONDITIONS
Check Area
•
Thirty seconds or more have passed since the
starting sequence was completed.
•
Engine coolant temperature is higher than 81
°
C
(178
°
F).
•
Engine speed is higher than 1200 r/min.
•
Volumetric efficiency is higher than 30 percent.
•
Under the closed loop air/fuel control.
AC003081 AB
16 PIN
MB991502