Mitsubishi Outlander XL. Manual — part 944
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication between the Scan Tool and the SRS-ECU
is not possible.
M15204000261USA0000010000
ETACS-ECU
Diagnosis Connector Circuit
FRONT SIDE
DATA LINK
CONNECTOR
ZC6008750000
Connector: C-125
C-125 (B)
ZC6008780006
Connector: C-317
TECHNICAL DESCRIPTION (COMMENT)
If the scan tool (M.U.T.-III Sub Assembly) can not
communicate with the SRS system, the CAN bus lines
may be defective. If the SRS system does not work,
the SRS-ECU or its power supply circuit may be
defective.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
⦆
Damaged wiring harness or connector
⦆
Malfunction of the SRS-ECU
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-307
SRS AIR BAG DIAGNOSIS
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. V.C.I. status check
Check that the V.C.I. indicator light is illuminated in green.
Q:Is it illuminated in green?
YES:
Diagnose the CAN bus line, and repair if necessary.
(Refer to GROUP 54D, Diagnosis P.54D-17.)
NO:
Go to Step 2.
STEP 2. Connector check: C-317 ETACS-ECU connector,
C-125 data link connector
Q:Is the check result normal?
YES:
Go to Step 3.
NO:
Repair the connector concerned.
STEP 3. Wiring harness check between the C-317 ETACS-
ECU connector No. 8 and the C-125 data link connector
terminal No. 16
⦆
Check the power supply line for open circuit.
Q:Is the check result normal?
YES:
Go to Step 4.
NO:
Repair the wiring harness.
STEP 4. Wiring harness check between the C-125 data link
connector terminal No. 4 or 5 and the ground
⦆
Check the ground wires for open circuit.
Q:Is the check result normal?
YES:
Check the scan tool.
NO:
Repair the wiring harness.
52B-308
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS AIR BAG DIAGNOSIS
INSPECTION PROCEDURE 2: Power supply circuit system
M15204000264USA0000010000
ETACS-ECU
SRS-ECU
IGNITION
SWITCH (IG1)
IG1
RELAY
FUSIBLE
LINK
34
IG1 Power Supply Circuit
POWER
SUPPLY
ZC600876
Connector: C-27
C-27 (Y)
0025
ZC6008780023
Connectors: C-309, C-313, C-317
C-309 (B)
C-316
C-317
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-309
SRS AIR BAG DIAGNOSIS
CIRCUIT OPERATION
⦆
The SRS-ECU is energized by the ignition switch
(IG1) through multi-purpose fuse 18 and the SRS-
ECU terminal 61 and multi-purpose fuse 12 and the
SRS-ECU terminal 62.
⦆
If the power supply to the SRS-ECU has failed, scan
tool (M.U.T.-III Sub Assembly) will not be able to
communicate with it.
TROUBLESHOOTING HINTS (THE MOST LIKELY
CAUSES FOR THIS CASE:)
⦆
Damaged wiring harness or connector
⦆
Defective battery
⦆
Charging system failed
⦆
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. Resistance measurement at the C-27 SRS-ECU
connectors
ZC600210
A
Lock lever
0000
(1)
While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction of
the arrow to release the lock lever, and disconnect the C-27
SRS-ECU connectors.
ZC5007880065
C-27 Harness side
connector (front view)
(2)
Take the measurements below at the C-27 wiring harness
side connectors.
⦆
Continuity between C-27 wiring harness side connector
terminal No. 59 and body ground
OK: Continuity (Less than 2 ohms)
Q:Is the check result normal?
YES:
Go to Step 2.
NO:
Repair the wiring harness between the C-27 SRS-ECU
connector terminal No. 59 and the ground.
STEP 2. Wiring harness check between the C-27 SRS-ECU
connector terminal Nos. 61 and 62 and the ignition switch
IG1
NOTE:
Prior to the wiring harness inspection, check the
ETACS-ECU connectors C-309, C-317 and C-313, and repair if
necessary.
⦆
Check the power supply line for open circuit.
Q:Is the check result normal?
YES:
Go to Step 3.
52B-310
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS AIR BAG DIAGNOSIS
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