Mitsubishi Montero (2002-2004). Manual — part 689
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-453
AC203992
Fuel Tank Differential Pressure Sensor Circuit
AB
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-454
.
CIRCUIT OPERATION
• The PCM (terminal 97) supplies a 5-volt refer-
ence signal to the fuel tank differential pressure
sensor (terminal 3). The fuel tank differential
pressure sensor (terminal 2) is grounded through
the PCM (terminal 96).
• The fuel tank differential pressure sensor (termi-
nal 1) returns a voltage signal to the PCM (termi-
nal 82) that is proportional to the pressure in the
fuel tank.
.
TECHNICAL DESCRIPTION
• The PCM monitors the fuel tank differential pres-
sure sensor output voltage.
• The PCM determines whether the fuel tank differ-
ential pressure sensor signal voltage is within
normal operating parameters.
.
DTC SET CONDITIONS
Test Conditions:
• Intake air temperature is greater than 5°C (41°F).
• Engine speed is greater than 1,600 r/min.
• Volumetric efficiency is between 25 and 80 per-
cent.
Judgment Criteria:
• When the evaporative emission purge solenoid is
off, the fuel differential pressure sensor output
voltage remains at 1.0 volt or less for ten sec-
onds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
• Malfunction of the fuel tank differential pressure
sensor.
• A damaged harness in the fuel tank differential
pressure sensor circuit.
• Malfunction of the PCM.
AC203998
CONNECTOR: D-112
AB
D-112
AC203993
CONNECTORS: D-134, D-135
AB
D-134
(GR)
D-135
(GR)
PCM
AC203999
CONNECTORS: E-111, E-113
AB
E-113
E-111
AC204000
CONNECTOR: F-07
AB
F-07 (B)
ACX00218
CONNECTOR : G-05
AQ
G-05 (B)
SECOND SEAT UNDER
SERVICE HOLE
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-455
.
OVERVIEW OF TROUBLESHOOTING
• DTC P0452 can be set by a faulty fuel tank differ-
ential pressure sensor or related circuit, or PCM
failure.
• To check a system blockage, do a performance
test which uses a mechanical vacuum gauge and
scan tool MB991502 set on the fuel tank differen-
tial pressure sensor (TANK PRS SNSR 73).
The mechanical gauge reading is used to verify
scan tool MB991502 reading.
A comparison of the mechanical gauge with the
reading on scan tool MB991502 will locate a
problem in the system.
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MB991658: Test Harness Set
STEP 1. Using scan tool MB991502, check data list item 73:
Fuel Tank Differential Pressure 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) Disconnect hose F from the evaporative emission canister
side, and plug the hose.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991502 to the data reading mode for item
73, Fuel Tank Differential Pressure Sensor.
• The fuel tank pressures reading on the scan tool should
be
−3.3 to 3.3 kPa (−0.97 to 0.97 inHg).
(6) Connect an evaporative emission system pressure pump to
the fuel tank filler tube and pressurize the fuel tank.
• The fuel tank pressure reading should increase.
(7) Disconnect an evaporative emission system pressure pump
and connect hose F.
(8) Turn the ignition switch to the "LOCK" (OFF) position and
disconnect scan tool MB991502.
Q: Is the fuel tank pressure between
−3.3 and 3.3 kPa (−
0.97 and 0.97 inHg)?
YES : 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 Malfunction
NO : Go to Step 2.
ACX01539
16-PIN
MB991502
AC
AC102602 AC
HOSE F
ACX01358
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-456
STEP 2. Measure the signal voltage at fuel tank differential
pressure sensor connector G-05.
(1) Tumble the second seat.
(2) Remove the service hole cover (upper) and packing.
(3) Remove the service hole cover (lower) and packing.
(4) Disconnect fuel tank differential pressure sensor connector
G-05.
(5) Connect special tool MB991658 between fuel tank
differential pressure sensor connector G-05 terminals 1, 2
and 3.
(6) Turn the ignition switch to the "ON" position.
(7) Remove the fuel cap.
(8) Measure the voltage between fuel tank differential pressure
sensor connector G-05 terminal 1 and ground.
• The voltage should measure between 2.0 and 3.0 volts.
(9) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 2.0 and 3.0 volts?
YES : Go to Step 10.
NO : Go to Step 3.
STEP 3. Measure the 5-volt reference signal at fuel tank
differential pressure sensor connector G-05.
(1) Disconnect fuel tank differential pressure sensor connector
G-05.
(2) Connect special tool MB991658 between fuel tank
differential pressure sensor connector G-05 terminals 1, 2
and 3.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between fuel tank differential pressure
sensor connector G-05 terminal 3 and ground.
• The voltage should measure between 4.8 and 5.2 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?
YES : Go to Step 8.
NO : Go to Step 4.
ACX00218
CONNECTOR : G-05
AS
G-05 (B)
SERVICE HOLE (UPPER)
G-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
SERVICE HOLE (LOWER)
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
ACX00218
CONNECTOR : G-05
AR
G-05 (B)
SECOND SEAT UNDER
SERVICE HOLE
G-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
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