Mitsubishi Montero (2002-2004). Manual — part 1050
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-71
DTC 61 : Master Cylinder Pressure Sensor System
.
CIRCUIT OPERATION
The master cylinder pressure sensor is monitoring
the brake fluid pressure to the rear wheels. The mas-
ter cylinder pressure sensor sends a signal from its
terminal No.1, and the M-ASTC-ECU receives the
signal at its connector No.59.
.
ABS DTC SET CONDITIONS
DTC 61 is set in the following case.
• When the power supply voltage is abnormally
high or low
• When the master cylinder pressure sensor output
signal is abnormally high or low
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the master cylinder pressure sen-
sor
• Malfunction of the M-ASTC-ECU
.
DIAGNOSIS
Required Special Tool:
• MB991223: Harness Set
Master Cylinder Pressure Sensor Circuit
AC204772AB
B-55(GR)
CONNECTOR: B-55
AC203901AF
CONNECTOR: E-120
E-120
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
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ANTI-LOCK BRAKING SYSTEM (ABS)
35B-72
STEP 1. Check the power supply circuit at pressure sensor
connector B-55.
(1) Do not disconnect pressure sensor connector B-55.
(2) Turn the ignition switch to the "ON" position.
(3) Measure voltage between terminal 2 and ground. It should
be approximately 5 volts.
Q: Is the voltage approximately 5 volts?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check the M-ASTC-ECU connectors E-120.
(1) Disconnect the M-ASTC-ECU connector E-120.
(2) Turn the ignition switch to the "ON" position.
(3) Measure voltage between terminal 50 and ground. It should
be approximately 5 volts.
Q: Is the voltage approximately 5 volts?
YES : Go to Step 3.
NO : Replace the M-ASTC-ECU and go to Step 10.
AC204772
AC204773AB
B-55(GR)
CONNECTOR: B-55
1
3
2
HARNESS CONNECTOR:
COMPONENT SIDE
AC203901
AC204627AV
CONNECTOR: E-120
E-120
ASC-ECU CONNECTOR:
HARNESS SIDE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-73
STEP 3. Check the harness wires between M-ASTC-ECU
connector E-120 terminal 50 and pressure sensor
connector B-55 terminal 2.
Q: Is the harness wire between M-ASTC-ECU connectors
E-120 terminal 50 and pressure sensor connector B-55
terminal 2 damaged?
YES : Repair it and then go to Step 10.
NO : This malfunction is intermittent. Refer to GROUP 00,
How to Use Troubleshooting/Inspection Service
Points
− How to Cope With Intermittent Malfunction
.
AC203901
AC204627AG
CONNECTOR: E-120
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
E-120
AC204772AC
B-55(GR)
CONNECTOR: B-55
1
3
2
HARNESS CONNECTOR:
COMPONENT SIDE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-74
STEP 4. Check the ground circuit at pressure sensor
connector B-55.
(1) Disconnect the pressure sensor connector B-55, and
measure at the harness side.
(2) Measure the resistance between terminal 3 and ground. It
should be less than 2 ohms.
Q: Is there continuity between the terminal number 3 and
ground?
YES : Go to Step 7.
NO : Go to Step 5.
AC204772
AC204773AC
B-55(GR)
CONNECTOR: B-55
1
3
2
HARNESS CONNECTOR:
HARNESS SIDE
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