Mitsubishi Montero (2004+). Manual — part 1056
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-67
STEP 3. Check the harness wire between the valve relay
connector B-21X terminal 2 and M-ASTC-ECU connector
E-120 terminal 62.
Q: Is the harness wire between the valve relay connector
B-21X terminal 2 and M-ASTC-ECU connector E-120
terminal 62 damaged?
YES : Repair it and then go to Step 5.
NO : Go to Step 4.
AC204706
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B-21X
CONNECTOR: B-21X
AB
RELAY BOX CONNECTOR
AC203901
AC204627AG
CONNECTOR: E-120
E-120
HARNESS CONNECTOR:
COMPONENT SIDE
E-120
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-68
STEP 4. Check the harness wire between the valve relay
connector B-21X terminal 4 and ground.
Q: Is the harness wire between the valve relay connector
B-21X terminal 4 and ground damaged?
YES : Repair it and then go to Step 5.
NO : Replace the M-ASTC-ECU and go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Q: Does DTC 51 reset?
YES : Go to Step 1.
NO : The procedure is complete.
DTC 52: Valve Relay System (Open Circuit or OFF Failure)
.
VALVE RELAY CIRCUIT
Refer to
.
CIRCUIT OPERATION
As the ignition switch is turned ON, M-ASTC-ECU
drives the valve relay in a series of ON
→OFF→ON
with the initial check in order to inspect the valve
relay for normal operation. It then maintains the valve
relay always at ON and supplies power to each sole-
noid valve.
.
ABS DTC SET CONDITIONS
DTC 52 is set if the M-ASTC-ECU judges that there
is a valve relay OFF problem when the valve relay is
on and power is not supplied to the solenoid valves.
.
TROUBLESHOOTING HINTS
• Malfunction of the valve relay
• Malfunction of the M-ASTC-ECU
• Damaged wiring harness or connector
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991223: Harness Set
AC204706
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B-21X
CONNECTOR: B-21X
RELAY BOX CONNECTOR
AC204706
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AC
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-69
STEP 1. Check the valve relay.
Q: Is the relay damaged?
YES : Replace it and go to Step 10.
NO : Go to Step 2.
STEP 2. Check the valve relay circuit at M-ASTC-ECU
connector E-119 by backprobing.
(1) Do not disconnect connector E-119.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 18 and ground by
backprobing. It should be less than 2V.
Q: Is the voltage less than 2V?
YES : Go to Step 3.
NO : Go to Step 5.
BATTERY VOLTAGE
TESTER
CONNECTION
SPECIFIED
CONDITION
Not applied
2
− 4
Less than 2
ohms
2
− 5
Open circuit
• Connect terminal 1 to the
positive battery terminal
• Connect terminal 3 to the
negative battery terminal
2
− 4
Open circuit
2
− 5
Less than 2
ohms
AC204274
AB
VALVE RELAY
2
1
3
5
4
1
3
2
4
5
AC203901AE
CONNECTOR: E-119
E-119
AC204705
HARNESS CONNECTOR:
COMPONENT SIDE
AB
E-119
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-70
STEP 3. Check the valve relay monitor circuit at
M-ASTC-ECU connector E-120 by backprobing.
(1) Do not disconnect connector E-120.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 55 and ground by
backprobing. It should be approximately 12 volts (battery
positive voltage).
Q: Is the voltage approximately 12 volts (battery positive
voltage)?
YES : Go to Step 4.
NO : Go to Step 6.
STEP 4. Check the M-ASTC-ECU connector E-120.
Q: Is the connector damaged?
YES : Repair it. Refer to GROUP 00E, Harness Connector
Inspection
NO : Replace the M-ASTC-ECU and go to Step 10.
STEP 5. Check the harness wire between ignition switch
(IG2) connector D-208 terminal 4 and M-ASTC-ECU
connector E-119 terminal 18.
NOTE: After inspecting ignition switch (IG2) connector D-208
and M-ASTC-ECU connector E-119, valve relay connector
B-21X, joint connector D-116, junction block connectors D-208,
D-212 and intermediate connector E-111, inspect the wire. If
ignition switch (IG2) connector D-208 and M-ASTC-ECU con-
nector E-106, valve relay connector B-21X, joint connector
D-116, junction block connectors D-208, D-212 and intermedi-
ate connector E-111 are damaged, repair or replace them.
Refer to GROUP 00E, Harness Connector Inspection
If the connector has been repaired or replaced, go to Step 10.
AC203901AF
CONNECTOR: E-120
E-120
AC205737
CONNECTOR: E-120
E-120
AB
HARNESS CONNECTOR:
HARNESS SIDE
AC203901AF
CONNECTOR: E-120
E-120
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