Mitsubishi Montero (2004+). Manual — part 1076
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-15
DTC 34: Defective CAN bus line
CAUTION
If the diagnostic trouble code(s), which indicate a defective CAN bus line, has been set, diagnose the
CAN main bus line.
.
CIRCUIT OPERATION
The M-ASTC-ECU gathers information through
CAN_H (terminal 83) and CAN_L (terminal 84) bus
lines from the power control module, the G and yaw
rate sensor and the steering wheel sensor.
.
M-ASTC DTC SET CONDITION
DTC 34 is set if communication errors have hap-
pened in at least two of the relevant ECUs and/or
sensors simultaneously, which are connected to
each other through the CAN bus line.
.
TROUBLESHOOTING HINTS
The most likely causes for DTC 34 to set are:
• The CAN bus line is defective.
AC204606
Can Bus Communication Circuit
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-16
• The register is defective.
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
STEP 1. Diagnose CAN main bus line.
CAUTION
If DTC 34 is set, diagnose the CAN main bus line.
Diagnose the CAN main bus line. Refer to
Q: Have you completed checking or repairing the CAN
main bus line?
YES : Go to Step 2.
NO : Diagnose the CAN main bus line. Refer to
.
STEP 2. Recheck for diagnostic trouble code.
Q: Does DTC 34 reset?
YES : Return to Step 1.
NO : The procedure is complete.
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-17
DTC 35, 37, 78: Defective power control module
.
CIRCUIT OPERATION
The M-ASTC-ECU gathers information regarding the
engine and automatic transmission, through the CAN
bus line from the power control module.
.
M-ASTC DTC SET CONDITION
DTC 35 is set if the engine related data contains an
error. DTC 37 is set if the automatic transmission
related data contains an error. In this case, the PCM
is sending data to the ECU, but the data contains a
fault.
.
TROUBLESHOOTING HINTS
The most likely causes for DTC 35, 37, 78 to set are:
• The power control module is defective
• The M-ASTC-ECU is defective.
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
AC205062
CAN Bus Communication Circuit (powertrain control module)
AB
M-ASTC DIAGNOSIS
TSB Revision
MITSUBISHI ACTIVE SKID AND TRACTION CONTROL SYSTEM
35C-18
STEP 1. Using scan tool MB991958, read the MFI
diagnostic 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 if the MFI DTC is set.
(4) Turn the ignition switch to the "LOCK (OFF)" position.
Q: Are MFI DTCs set?
YES : Diagnose the power control module. Refer to
NO : Go to Step 2.
STEP 2. Check by the substitution of a known good
M-ASTC-ECU (Recheck for diagnostic trouble code).
(1) Replace the M-ASTC-ECU with a know good unit.
(2) Check for DTC.
Q: Is DTC 35, 37 or 78 reset?
YES : Replace the power control module, and then go to
Step 3.
NO : Replace the M-ASTC-ECU, and then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Does DTC 35, 37 or 78 reset?
YES : Return to Step 1.
NO : The procedure is complete.
AC307591 AC
MB991911
MB991824
MB991827
AC307591
DATA LINK
CONNECTOR
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