Mitsubishi Montero (2002-2004). Manual — part 578
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-9
DTC P0102: Volume Airflow Circuit Low Input
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)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-10
.
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.
.
DTC SET CONDITIONS
Check Conditions
• Engine speed is higher than 500 r/min.
Judgement Criteria
• Volume airflow sensor output frequency has con-
tinued to be 3.3 Hz or lower 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
AK200940AD
B-48(B)
CONNECTOR: B-48
VOLUME AIRFLOW
SENSOR
AK201038AH
CONNECTORS: D-133, D-134
PCM
D-134(GR)
D-133(GR)
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-11
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 power supply 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.4 and ground by
backprobing.
• 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 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)
AKX01514
6 7
1 2 3 4 5
AKX01514
AK
B-48 HARNESS
CONNECTOR:
HARNESS SIDE
TSB Revision
DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-12
STEP 3. Measure the power supply voltage at volume
airflow sensor harness side connector B-48.
(1) Disconnect the connector B-48 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 4 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 4.
NO : Repair harness wire between MFI relay connector B-
22X (terminal No. 1) and volume airflow sensor
connector B-48 (terminal No. 4) because of open
circuit or short circuit to ground. Then go to Step 13.
STEP 4. Check connector B-48 at the volume airflow
sensor for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between MFI relay connector B-
22X (terminal No. 1) and volume airflow sensor
connector B-48 (terminal No. 4) because of harness
damage. Then go to Step 13.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
STEP 5. Check connector B-48 at volume airflow sensor
for damage.
Q: Is the connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 13.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AKX01405
B-48 HARNESS CONNECTOR:
COMPONENT SIDE
AK
1
2
3
4
5
6
7
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
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