Mitsubishi Montero (2004+). Manual — part 1049
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-39
.
CIRCUIT OPERATION
• The M-ASTC-ECU has two power supply lines.
The M-ASTC-ECU power is supplied to the
M-ASTC-ECU (terminal 63) from the ignition
switch (IG2) through the multi-purpose fuse num-
ber 5 in the junction block and through the joint
connector number 4. The other M-ASTC-ECU
power is supplied to the M-ASTC-ECU (terminal
9) from the ignition switch (IG2) through the
multi-purpose fuse number 17 in the junction
block.
• If the ignition switch is turned to the "ON" posi-
tion, the M-ASTC-ECU turns on the valve relay,
and monitors the power supply voltage to the
valve relay at terminal 55.
.
ABS DTC SET CONDITIONS
M-ASTC-ECU always monitors the ignition switch
(IG2). DTC 31 is set when the M-ASTC-ECU detects
an open circuit for approximately four seconds with
the ignition switch at the "ON" position.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness or connector
• Malfunction of the M-ASTC-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
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-40
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Using scan tool MB991958, read the diagnosis
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the ABS DTC.
Q: Is ABS DTC 52 set?
YES : Carry out the troubleshooting regarding DTC 52.
Refer to
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, read the HBB
diagnosis trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Check the HBB DTC.
Q: Is HBB DTC 16 set?
YES : Carry out the troubleshooting regarding HBB. Refer to
GROUP 35A, HBB Diagnosis
NO : Go to Step 3.
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-41
STEP 3. Check the battery.
Refer to GROUP 54A, Battery
− On-vehicle Service − Battery
Testing Procedure
Q: Is the battery damaged?
YES : Charge or replace the battery and then go to Step 5.
NO : Go to Step 4.
STEP 4. Check the charging system.
Refer to GROUP 16, Charging System
− Diagnosis
.
Q: Is the charging system damaged?
YES : Repair the Charging System and then go to Step 5.
NO : Replace the M-ASTC-ECU and then go to Step 5.
STEP 5. Recheck for diagnostic trouble code.
Q: Does DTC 16 reset?
YES : Start over at Step 1.
NO : The procedure is complete.
ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS
TSB Revision
ANTI-LOCK BRAKING SYSTEM (ABS)
35B-42
DTC 33 : Stoplight Switch System
AC204646AB
Stoplight Switch Circuit
AC204676 AB
DETICATED FUSE No.16
RELAY BOX
AC204677AB
CONNECTORS: D-28, D-29, D-123, D-125
D-28
D-29
D-125
D-123
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