Mitsubishi Montero (2004+). Manual - part 1052

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-51

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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.

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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.

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TROUBLESHOOTING HINTS

• Damaged wiring harness or connector

• Malfunction of the M-ASTC-ECU

• Malfunction of the hydraulic brake booster (HBB)

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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