Mitsubishi Montero (2004+). Manual — part 1052
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-51
.
CIRCUIT OPERATION
As the ignition switch is turned ON, power is supplied
to each solenoid valve via the valve relay.
M-ASTC-ECU, by turning ON the transistor, grounds
the circuit and turns the solenoid valve ON.
.
ABS DTC SET CONDITIONS
The M-ASTC-ECU constantly monitors the solenoid
valve drive circuits. These codes are output if the
M-ASTC-ECU judges that there is an open circuit or
short-circuit in a solenoid coil or harness because the
solenoid valve is on but no current flows to the sole-
noid valve, or if current continues flowing to the sole-
noid valve even though the solenoid valve is off.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the M-ASTC-ECU
• Malfunction of the hydraulic brake booster (HBB)
.
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
AC203901AD
CONNECTORS: E-119, E-120
E-119
E-120
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-52
STEP 1. Check the solenoid valve circuit at M-ASTC-ECU
connector E-119 and E-120 by backprobing.
(1) Do not disconnect connector E-119 and E-120.
(2) Turn the ignition switch to the "ON" position.
(3) Measure voltage between the following terminals. It should
be approximately 12 volts (battery positive voltage).
When DTC 41 is set:
• M-ASTC-ECU connector E-120 terminal 43 and ground
• M-ASTC-ECU connector E-120 terminal 42 and ground
When DTC 42 is set:
• M-ASTC-ECU connector E-119 terminal 3 and ground
• M-ASTC-ECU connector E-119 terminal 10 and ground
When DTC 43 is set:
AC203901
AC204627AI
E-120
CONNECTOR: E-120
E-120
HARNESS CONNECTOR:
HARNESS SIDE
AC203901
AC204627AJ
E-119
CONNECTOR: E-119
E-119
HARNESS CONNECTOR:
HARNESS SIDE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-53
• M-ASTC-ECU connector E-119 terminal 1 and ground
• M-ASTC-ECU connector E-119 terminal 2 and ground
When DTC 44 is set:
• M-ASTC-ECU connector E-120 terminal 45 and ground
• M-ASTC-ECU connector E-120 terminal 44 and ground
When DTC 45 is set:
AC203901
AC204627AK
E-119
CONNECTOR: E-119
E-119
HARNESS CONNECTOR:
HARNESS SIDE
AC203901
AC204627AL
E-120
CONNECTOR: E-120
E-120
HARNESS CONNECTOR:
HARNESS SIDE
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-54
• M-ASTC-ECU connector E-119 terminal 7 and ground
When DTC 46 is set:
• M-ASTC-ECU connector E-120 terminal 8 and ground
Q: Is the voltage approximately 12 volts (battery positive
voltage)?
YES : Go to Step 2.
NO : Go to Step 3.
AC203901
AC204627AM
E-119
CONNECTOR: E-119
E-119
HARNESS CONNECTOR:
HARNESS SIDE
AC203901
AC204627AN
E-119
CONNECTOR: E-119
E-119
HARNESS CONNECTOR:
HARNESS SIDE
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