Mitsubishi Evolution X. Manual — part 712
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-295
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
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. Refer to "How to connect the
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code
Check if DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU.
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the SRS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the SRS-ECU (Refer to
).
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to use Troubleshooting/inspection
Service Points
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-296
DTC U1415: Coding not Completed/Data Fail
CAUTION
• If the DTC U1415 is set, diagnose the CAN
main bus lines.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DIAGNOSTIC FUNCTION
If the vehicle information data is not registered to the
SRS-ECU, the SRS-ECU sets the DTC U1415.
.
JUDGMENT CRITERIA
With the global coding counter value "0", if all the glo-
bal coding data (vehicle information) are not stored,
the SRS-ECU determines that a problem has
occurred.
.
TROUBLESHOOTING HINTS
• The CAN bus line may be defective
• The ETACS-ECU may be defective
• The SRS-ECU may be defective
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicles Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
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. Refer to "How to connect the
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-297
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code
Check if DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU.
NO : Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the SRS-ECU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Replace the SRS-ECU.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to use Troubleshooting/inspection
Service Points
DIAGNOSTIC TROUBLE CODE CHART
<OCCUPANT CLASSIFICATION-ECU>
M1524003301628
CAUTION
During diagnosis, a DTC code associated with another system may be set when the ignition switch is
turned on with connector(s) disconnected. After completing the repair, confirm all systems for DTC
code(s). If DTC code(s) are set, erase them all.
Inspect according to the inspection chart that is appropriate for the DTC.
Diagnostic trouble
Code No.
Inspection item
Reference page
B1B78
Passenger seat weight sensor (front: LH) performance
B1B79
Passenger seat weight sensor (ground side) short-circuited
(front: LH)
B1B7A
Passenger seat weight sensor (power supply side)
short-circuited or open (front: LH)
B1B7D
Passenger seat weight sensor (front: RH) performance
B1B7E
Passenger seat weight sensor (ground side) short-circuited
(front: RH)
B1B7F
Passenger seat weight sensor (power supply side)
short-circuited or open (front: RH)
B1B82
Passenger seat weight sensor (rear: LH) performance
B1B83
Passenger seat weight sensor (ground side) short-circuited
(rear: LH)
B1B84
Passenger seat weight sensor (power supply side)
short-circuited or open (rear: LH)
B1B87
Passenger seat weight sensor (rear: RH) performance
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-298
B1B88
Passenger seat weight sensor (ground side) short-circuited
(rear: RH)
B1B89
Passenger seat weight sensor (power supply side)
short-circuited or open (rear: RH)
B1B8C
Seat slide sensor circuit performance
B1B8D
Seat slide sensor open circuit
B1B8E
Seat slide sensor (power supply side) short circuit
B1B91
Driver seat slide sensor configuration mismatch
B1BA7
Occupant classification system verification required
B1BA8
Occupant classification-ECU out of calibration/Not
calibrated
B1BBA
Passenger seat weight sensor power supply circuit
B1BBC
Occupant classification system negative system weight
B1BBD
Occupant classification -ECU Current configuration table
unprogrammed
B1C23
Passenger seat weight sensor (front: LH) configuration
mismatch
B1C24
Passenger seat weight sensor (front: RH) configuration
mismatch
B1C25
Passenger seat weight sensor (rear: LH) configuration
mismatch
B1C26
Passenger seat weight sensor (rear: RH) configuration
mismatch
B1CB2
Occupant classification-ECU parameter table incompatible
B210D
Battery voltage Low
B210E
Battery voltage High
B2206
Chassis number does not match
B2212
Occupant classification-ECU internal failure
B2250
Occupant classification-ECU not programmed/Flash
required
B2262
Occupant classification-ECU electrostatic discharge event
detected
U0020
CAN-B Bus off performance
U0021
CAN-B Bus (HI) circuit open
U0022
CAN-B Bus (HI) shorted to circuit ground
U0023
CAN-B Bus (HI) shorted to circuit power supply
U0024
CAN-B Bus (LO) circuit open
U0025
CAN-B Bus (LO) shorted to circuit ground
U0026
CAN-B Bus (LO) shorted to circuit power supply
U0141
ETACS CAN timeout
Diagnostic trouble
Code No.
Inspection item
Reference page
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