Mitsubishi Outlander XL. Manual — part 314
Q:Are there any abnormalities?
YES:
Repair it. Then go to Step 4.
NO:
Go to Step 3.
STEP 3. Check the trouble symptoms.
(1)
Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function - OBD-II Drive Cycle - Pattern 3 P.
13Ab-8.
(2)
Check the diagnostic trouble code (DTC).
Q:Is DTC P0401 set?
YES:
Replace the ECM. When the ECM is replaced, register
the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8. Then go to Step 4.
NO:
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 P.00-15.
STEP 4. 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 - Pattern 3 P.
13Ab-8.
(2)
Check the diagnostic trouble code (DTC).
Q:Is DTC P0401 set?
YES:
Retry the troubleshooting.
NO:
The inspection is complete.
DTC P0421: Warm Up Catalyst Efficiency Below Threshold (bank 1)
M11310100229USA0000010000
TECHNICAL DESCRIPTION
⦆
The signal from the rear heated oxygen sensor
differs from the front heated oxygen sensor,
because the catalytic converter purifies exhaust
gas. When the catalytic converter has deteriorated,
the signal from the front heated oxygen sensor
becomes similar to the rear heated oxygen sensor.
⦆
The ECM compares the output of the front and rear
heated oxygen sensor signals.
DESCRIPTIONS OF MONITOR METHODS
Front and rear heated oxygen sensor rich/lean
switching frequencies are nearly equal.
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 (front) monitor
⦆
Heated oxygen sensor (rear) monitor
⦆
Heated oxygen sensor heater (front) monitor
⦆
Heated oxygen sensor heater (rear) monitor
⦆
Misfire monitor
⦆
Fuel system 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
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-451
DIAGNOSTIC TROUBLE CODE PROCEDURES
⦆
Throttle position sensor
⦆
Accelerator pedal position sensor
DTC SET CONDITIONS
Logic Flow Chart
AK603767 AA00
No
No
No
No
Yes
Yes
Yes
Yes
Good
Malfunction
Monitoring
conditions
Specified times monitored?
Rf < R1
Rf > R0
End
Start
Calculate frequency of
front oxygen sensor output signal (Ff)
Calculate frequency of
rear oxygen sensor output signal (Fr)
Calculate frequency ratio (Rf = Fr/Ff)
Calculate average frequency
ratio (Rf = Fr/Ff) of specified times
13Ab-452
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
Check Conditions
⦆
Engine speed is lower than 3,000 r/min.
⦆
Accelerator pedal is open.
⦆
Mass airflow is between 10 and 35 g/sec.
⦆
More than 3 seconds have elapsed after the above-
mentioned three conditions have been met.
⦆
Intake air temperature is higher than -10°C (14°F).
⦆
Barometric pressure is higher than 76 kPa (22.4
in.Hg).
⦆
Under the closed loop air/fuel ratio control.
⦆
Vehicle speed is 1.5 km/h (1.0 mph) or more.
⦆
The PCM monitors for this condition for 3 cycles of
12 seconds each during the drive cycle.
⦆
Short-term fuel trim is higher than -25 percent and
lower than +25 percent.
⦆
The cumulative mass airflow is higher than 1,638 g.
Judgement Criterion
⦆
When the monitoring for 12 seconds is carried out
5 times, the frequency ratio of rear and front is 0.7
or more.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle -
Pattern 4 P.13Ab-8.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
⦆
Catalytic converter deteriorated (Exhaust leak).
DIAGNOSIS
Required Special Tools:
⦆
MB991958: Scan tool (M.U.T.-III Sub Assembly)
⦆
MB991824: V.C.I.
⦆
MB991827: USB Cable
⦆
MB991910: Main Harness A
STEP 1. Replace the right bank side catalytic converter.
(1)
Replace the catalytic converter.
(2)
Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function - OBD-II Drive Cycle - Pattern 4 P.
13Ab-8.
(3)
Check the diagnostic trouble code (DTC).
Q:Is DTC P0421 set?
YES:
Replace the ECM. When the ECM is replaced, register
the ID code. Refer to GROUP 42B, ID Code Registration
Judgment Table <Vehicles with KOS> P.42B-12or GROUP
42C, ID Code Registration Judgment Table <Vehicles with
WCM> P.42C-8.
NO:
The inspection is complete.
DTC P0431: Warm Up Catalyst Efficiency Below Threshold (bank 2)
M11310100230USA0000010000
TECHNICAL DESCRIPTION
⦆
The signal from the rear heated oxygen sensor
differs from the front heated oxygen sensor,
because the catalytic converter purifies exhaust
gas. When the catalytic converter has deteriorated,
the signal from the front heated oxygen sensor
becomes similar to the rear heated oxygen sensor.
⦆
The ECM compares the output of the front and rear
heated oxygen sensor signals.
DESCRIPTIONS OF MONITOR METHODS
Front and rear heated oxygen sensor rich/lean
switching frequencies are nearly equal.
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
13Ab-453
DIAGNOSTIC TROUBLE CODE PROCEDURES
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 (front) monitor
⦆
Heated oxygen sensor (rear) monitor
⦆
Heated oxygen sensor heater (front) monitor
⦆
Heated oxygen sensor heater (rear) monitor
⦆
Misfire monitor
⦆
Fuel system 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
⦆
Throttle position sensor
⦆
Accelerator pedal position sensor
13Ab-454
MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS>
DIAGNOSTIC TROUBLE CODE PROCEDURES
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст