Mitsubishi Evolution X. Manual — part 709
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-283
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
STEP 3. Check for any diagnostic trouble code.
Check the front impact sensor (RH).
(1) Disconnect the negative battery terminal.
(2) Alternate the front impact sensor (RH) and front impact
sensor (LH), and then install the alternated sensors.
(3) Connect the negative battery terminal.
(4) Erase diagnostic trouble code from memory, and check the
diagnostic trouble code.
Q: Is DTC U0170 set?
YES : Replace the front impact sensor (RH) with a new one
(Refer to
). Go to Step 5.
NO : Go to Step 4.
STEP 4. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-37 (terminal No.23
and 24) and front impact sensor (RH) connector A-52
(terminal No.2 and 1).
NOTE: After inspecting intermediate connector A-42, C-131
inspect the wiring harness. If the intermediate connector A-42,
C-131 is damaged, repair or replace it.
Q: Are the harness wires between SRS-ECU connector
C-37 (terminal No.23 and 24) and front impact sensor
(RH) connector A-52 (terminal No.2 and 1 in good
condition?
YES : Go to Step 5.
NO : Replace the harness wires between SRS-ECU
connector C-37 and front impact sensor (RH)
connector A-52.
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-284
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0171 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 Cope with Intermittent
Malfunction
).
DTC U0172: Side Impact Sensor (LH) Communication Error
SIDE IMPACT
SENSOR
(LH)
SRS-ECU
ACCELERO
METER
CPU
Side Impact Sensor (LH) Circuit
AC708951AD
Connector: C-36
C-36 (Y)
AC708955AJ
Connector: D-26
D-26 (Y)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-285
CAUTION
If DTC U0172 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
If an impact of set value or more is detected, the side
impact sensor sends the coded acceleration data to
SRS-ECU. Based on the acceleration data,
SRS-ECU determines the necessity of side-air bag
and curtain air bag deployment, and then turns ON
the power supply circuit to the inflator.
.
DTC SET CONDITIONS
These DTCs are set if communication between the
side impact sensor (LH) and the SRS-ECU is not
possible or faulty.
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Malfunction of the side impact sensor (LH)
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle 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-286
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
STEP 3. Check for any diagnostic trouble code.
Check the side impact sensor (LH).
(1) Disconnect the negative battery terminal.
(2) Alternate the side impact sensor (LH) and side impact
sensor (RH), and then install the alternated sensors.
(3) Connect the negative battery terminal.
(4) Erase diagnostic trouble code from memory, and check the
diagnostic trouble code.
Q: Is DTC U0175 set?
YES : Replace the side impact sensor (LH) with a new one
(Refer to
). Go to Step 5.
NO : Go to Step 4.
STEP 4. Check the harness wires for open circuit or short
circuit between SRS-ECU connector C-36 (terminal No.49
and 50) and side impact sensor (LH) connector D-26
(terminal No.1 and 2).
Q: Are the harness wires between SRS-ECU connector
C-36 (terminal No.49 and 50) and side impact sensor
(LH) connector D-26 (terminal No.1 and 2) in good
condition?
YES : Go to Step 5.
NO : Replace the harness wires between SRS-ECU
connector C-36 and side impact sensor (LH)
connector D-26.
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC U0172 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 Cope with Intermittent
Malfunction
).
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