Mitsubishi Montero (2002-2004). Manual — part 576
13Ac-1
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-2
.
DTC P0101: Volume Airflow Circuit Range/Performance Ploblem
1 2 3 4 5 6 7
3 4
1 2
RED
GREEN
WHITE-BLA
CK
SKY B
ULE
WHITE-
BLA
CK
WHITE-
BLA
CK
AK201126
B-48
B-22X
MFI
RELAY
BATTERY
VOLUME AIRFLOW
SENSOR
POWERTRAIN CONTROL MODULE(PCM)
5 V
37
7
88
63
4
3
2
5
3
1
4
Volume Airflow Sensor Circuit
31
35363738394041 42 43
444546474849
50 51
5253
545556
57 58
32
33 34
D-133
(MU803803)
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-3
.
CIRCUIT OPERATION
• The volume airflow sensor power is supplied from
the MFI relay (terminal No. 1), and the ground is
provided on the PCM (terminal No. 88).
• 5-volt power is applied to the volume airflow sen-
sor output terminal (terminal No. 3) from the PCM
(terminal No. 63). The volume airflow sensor gen-
erates a pulse signal when the output terminal
and ground are opened/closed (opened/short).
.
TECHNICAL DESCRIPTION
• While the engine is running, the volume airflow
sensor outputs a pulse signal which corresponds
to the volume of air flow.
• The PCM checks whether the frequency of this
signal output by the volume airflow sensor while
the engine is running is at or above the set value.
• When the throttle position sensor output voltage
is low, the PCM causes the power transistor to be
"ON" to send an volume airflow sensor reset sig-
nal to the volume airflow sensor. In response to
the reset signal, the volume airflow sensor resets
the filter circuit and improves the ability of the vol-
ume airflow sensor to measure the amount of air
in a small air intake region.
.
DTC SET CONDITIONS
Check Conditions
• Throttle position sensor output voltage is 1.5 volts
or higher.
• Engine speed is higher than 2,000 r/min.
Judgement Criteria
• Volume airflow sensor output frequency has con-
tinued to be 60 Hz or lower for 2 seconds.
Check Conditions
• Throttle position sensor output voltage is 2 volts
or lower.
• Engine speed is lower than 2,000 r/min.
Judgement Criteria
• Volume airflow sensor output frequency has con-
tinued to be 800 Hz or higher for 2 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Volume airflow sensor failed.
• Open or shorted volume airflow sensor circuit, or
loose connector.
• PCM failed.
• Air leak between volume airflow sensor and throt-
tle body.
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
AK201038AH
CONNECTORS: D-133, D-134
PCM
D-134(GR)
D-133(GR)
AK200940AD
B-48(B)
CONNECTOR: B-48
VOLUME AIRFLOW
SENSOR
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-4
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 12:
Volume Airflow Sensor.
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
12, Volume Airflow Sensor.
(4) Warm up the engine to normal operating temperature: 80
°C
to 95
°C (176°F to 203°F).
• The standard value during idling should be 10 Hz or
more.
• When the engine is revved, the frequency should
increase according to the increase in engine speed.
(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 : Go to Step 2.
STEP 2. Measure the reset signal voltage at volume airflow
sensor connector B-48 by backprobing.
(1) Do not disconnect the connector B-48.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 7 and ground by
backprobing.
• Voltage should be between 6.0 and 9.0 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 6.0 and 9.0 volts?
YES : Go to Step 5.
NO : Go to Step 3.
ACX01539
16-PIN
MB991502
AC
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AKX01515
6 7
1 2 3 4 5
AKX01515
AJ
B-48 HARNESS
CONNECTOR:
HARNESS SIDE
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