Mitsubishi Montero (2004+). Manual — part 1055
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-63
STEP 4. Check the solenoid valve
(1) Disconnect HBB connector B-14 and B-18, and measure at
the HBB side.
(2) Measure the resistance between the following solenoid
valve terminals.
• Control solenoid valve IN (FR): Between HBB connector
B-14 terminal 19 and HBB connector B-18 terminal 34
• Control solenoid valve OUT (FR): Between HBB con-
nector B-14 terminal 20 and HBB connector B-18 termi-
nal 34
• Control solenoid valve IN (FL): Between HBB connector
B-14 terminal 21 and HBB connector B-18 terminal 34
• Control solenoid valve OUT (FL): Between HBB connec-
tor B-14 terminal 22 and HBB connector B-18 terminal
34
• Control solenoid valve IN (RR): Between HBB connector
B-14 terminal 15 and HBB connector B-18 terminal 34
• Control solenoid valve OUT (RR): Between HBB con-
nector B-14 terminal 16 and HBB connector B-18 termi-
nal 34
• Control solenoid valve IN (RL): Between HBB connector
B-14 terminal 13 and HBB connector B-18 terminal 34
• Control solenoid valve OUT (RL): Between HBB con-
nector B-14 terminal 14 and HBB connector B-18 termi-
nal 34
• Select solenoid valve (FR): Between HBB connector
B-14 terminal 18 and HBB connector B-18 terminal 34
• Select solenoid valve (FL): Between HBB connector
B-14 terminal 17 and HBB connector B-18 terminal 34
Standard value: Control solenoid valve IN: 4.75
−
5.25
Ω
Control solenoid valve OUT: 2.0
− 2.4 Ω
Select solenoid valve: 3.5
− 3.9 Ω
Q: Is the resistance value within the standard value?
YES : Replace the M-ASTC-ECU and go to Step 5.
NO : Replace the HBB master cylinder and hydraulic unit
assembly. Then go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Q: Do DTCs 41, 42, 43, 44, 45 and 46 reset?
YES : Go to Step 1.
NO : The procedure is complete.
AC204702AC
CONNECTORS: B-14, B-18
B-18(B)
B-14(B)
AC204704
HARNESS
CONNECTOR:
HARNESS SIDE
HARNESS
CONNECTOR:
HARNESS SIDE
B-14
B-18
AB
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-64
DTC 51: Valve Relay System (Short Circuit or ON Failure)
AC204645AB
M-ASTC-ECU Power Supply Circuit
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-65
.
CIRCUIT OPERATION
As the ignition switch is turned ON, the
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 solenoid valve.
.
ABS DTC SET CONDITIONS
DTC 51 is set when the M-ASTC-ECU judges during
the initial check when the ignition switch is turned to
the ON position and the valve relay is OFF that there
is a fused relay contact or a short-circuit in the valve
relay drive circuit when power is being supplied to
the solenoid valve.
.
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
AC204545 AC
CONNECTORS: B-17, B-18
B-17 (GR)
B-18 (B)
AC204674
AB
B-21X (VALVE RELAY)
CONNECTOR: B-21X
AC204675AB
D-116
CONNECTOR: D-116
AC204547AB
CONNECTORS: D-208, D-212
D-208
D-212
JUNCTION BLOCK
(FRONT VIEW)
AC204548AL
E-111
CONNECTORS: E-108, E-111
E-108
AC203901AD
CONNECTORS: E-119, E-120
E-119
E-120
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-66
STEP 1. Check the valve relay.
Q: Is the relay damaged?
YES : Replace it and go to Step 5.
NO : Go to Step 2.
STEP 2. Check the valve relay circuit at M-ASTC-ECU
connector E-119.
(1) Disconnect connector E-119 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 18 and ground. It
should be approximately 12 volts (battery positive voltage).
Q: Is the voltage approximately 12 volts (battery positive
voltage)?
YES : Go to Step 3.
NO : Repair it because of short circuit to ground between
the valve relay and M-ASTC-ECU. Then 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
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