Mitsubishi Montero (2002-2004). Manual — part 676
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-401
STEP 6. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 3
− Catalytic Converter Monitor
.
(2) Read the diagnostic trouble code.
Q: Is DTC P0421 set?
YES : Replace the PCM. Then go to Step 7.
NO : The inspection is complete.
STEP 7. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 3
− Catalytic Converter Monitor
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0421 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0431: Warm up catalyst Efficiency Below Threshold (bank 2)
.
TECHNICAL DESCRIPTION
• The signal from the rear heated oxygen sensor
differs from the front heated oxygen sensor. That
is because the catalytic converter purifies
exhaust gas. When the catalytic converter has
deteriorated, the signal from the front heated oxy-
gen sensor becomes similar to the rear heated
oxygen sensor.
• The PCM compares the output of the front and
rear heated oxygen sensor signals.
.
DTC SET CONDITIONS
Check Conditions
• Engine speed is lower than 3,000 r/min.
• The throttle valve is open.
• Volume airflow sensor output frequency is
between 69 and 169 Hz.
• More than 3 seconds has 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 (11
psi).
• Under the closed loop air/fuel ratio control.
• Vehicle speed is 1.5 km/h (0.93 mph) or more.
• The PCM monitors for this condition for 7 cycles
of 12 seconds each during the drive cycle.
• Short-term fuel trim is higher than −30 percent
and lower than +25 percent.
• The cumulative volume airflow sensor output fre-
quency for every 2 seconds is higher than 4,000
Hz.
Judgment Criteria
• The left bank heated oxygen sensor (rear) signal
frequency divided by left bank heated oxygen
sensor (front) signal frequency = 0.75 or more.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Left bank side catalytic converter deteriorated.
• Left bank heated oxygen sensor failed.
• PCM failed.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-402
STEP 1. Check the exhaust leaks.
Q: Are there any abnormalities?
YES : Go to Step 2.
NO : Repair it. Then go to Step 7.
STEP 2. Using scan tool MB991502, check data list item 59:
Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting 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
59, Heated Oxygen Sensor Bank 2, Sensor 2 (left rear).
• Warming up the engine. When the engine is revved, the
output voltage should repeat 0 volt and 0.6 to 1.0 volt
alternately.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 3.
NO : Refer to DTC P0156
− Heated Oxygen Sensor Circuit
(Bank 2, Sensor 2)
, DTC P0157
− Heated
Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor
2)
− Heated Oxygen Sensor
Circuit High Voltage (Bank 2, Sensor 2)
,
DTC P0159
− Heated Oxygen Sensor Circuit Slow
Response (Bank 2, Sensor 2)
STEP 3. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item
11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
• Warming up the engine. When the engine is revved, the
output voltage should be 0.6 to 1.0 volt.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 4.
NO : Refer to DTC P0150
− Heated Oxygen Sensor Circuit
(Bank 2, Sensor 1)
, DTC P0151
− Heated
Oxygen Sensor Circuit Low Voltage (Bank 2, Sensor
1)
− Heated Oxygen Sensor
Circuit High Voltage (Bank 2, Sensor 1)
,
DTC P0153
− Heated Oxygen Sensor Circuit Slow
Response (Bank 2, Sensor 1)
P0154
− Heated Oxygen Sensor Circuit No Activity
Detected (Bank 2, Sensor 1)
.
ACX01539
16-PIN
MB991502
AC
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-403
STEP 4. Using scan tool MB991502, check data list item 11:
Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
(1) Start the engine and run at idle.
(2) Set scan tool MB991502 to the data reading mode for item
11, Heated Oxygen Sensor Bank 2, Sensor 1 (left front).
(3) Keep the engine speed at 2,000 r/min.
• 0 − 0.4 and 0.6 − 1.0 volt should alternate 15 times or
more within 10 seconds.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : Go to Step 5.
NO : Replace the left bank heated oxygen sensor (front).
Then go to Step 7.
STEP 5. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 3
− Catalytic Converter Monitor
.
(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?
YES : Replace the left bank side catalytic converter. Then
go to Step 6.
NO : The inspection is complete.
STEP 6. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 3
− Catalytic Converter Monitor
.
(2) Read the diagnostic trouble code.
Q: Is DTC P0431 set?
YES : Replace the PCM. Then go to Step 7.
NO : The inspection is complete.
STEP 7. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
GROUP 13A, Procedure 3
− Catalytic Converter Monitor
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0431 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-404
DTC P0441: Evaporative Emission System Incorrect Purge Flow
.
TECHNICAL DESCRIPTION
• PCM detects stuck open of evaporative emission
purge solenoid valve and stuck close of evapora-
tive emission ventilation solenoid valve by pres-
sure change in fuel tank.
• Stuck open of evaporative emission purge sole-
noid valve is judged through monitoring leak of
evaporative emission system.
• Stuck close of evaporative emission ventilation
solenoid valve is judged after 20 seconds of end
of monitoring leak of evaporative emission sys-
tem, or of usual operation of evaporative emis-
sion purge solenoid from ON to OFF.
.
DTC SET CONDITIONS
Check Conditions
• ON duty cycle of the evaporative emission purge
solenoid is 0 percent.
• 20 seconds have elapsed from the time the duty
cycle of the evaporative emission purge solenoid
has turned to 0 percent.
Judgment Criteria
• The pressure in the fuel tank is −2 kPa (0.29 psi)
or less for 0.1 second.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Evaporative emission purge solenoid failed.
• Evaporative emission ventilation solenoid failed.
• Choking up of hose between evaporative emis-
sion canister and evaporative emission ventila-
tion solenoid.
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P0451 set?
YES : Refer to, DTC P0451 - Evaporative Emission System
Pressure Sensor Range/Performance
NO : Go to Step 2.
AK200968
EVAPORATIVE
EMISSION PURGE
SOLENOID
AB
B-06(B)
CONNECTOR: B-06
AK201059
G-27(B)
AB
CONNECTOR: G-27
ACX01539
16-PIN
MB991502
AC
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