Mitsubishi Evolution X. Manual — part 1157
TROUBLESHOOTING
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LOCAL INTERCONNECT NETWORK (LIN)
54B-21
Recheck for diagnostic trouble code.
Check again if the DTC is set to the ETACS-ECU.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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
Scan Tool (M.U.T.-III)
(2) Erase the DTC.
(3) Turn the ignition switch to the "ON" position.
(4) Check if the DTC is set.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES <A DTC other than U1514 is set.> : Replace the
appropriate ECU.
YES <The DTC U1514 is set.> : Replace the ETACS-ECU.
NO <The DTC is not set.> : The trouble can be an
intermittent malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction
TROUBLESHOOTING
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LOCAL INTERCONNECT NETWORK (LIN)
54B-22
DTC U1515: No-Bus activity error (LIN)
LIN Communication Circuit
INTERFACE CIRCUIT
INPUT CIRCUIT
CPU
COLUMN-ECU
COLUMN
SWITCH
POWER WINDOW
MAIN SWITCH
SUNROOF MOTOR
ASSEMBLY
LIN DRIVE CIRCUIT
ETACS-ECU
JOINT
CONNECTOR (2)
LIGHTING CONTROL
SENSOR
AC708950BR
C-129 (BR)
C-102 (B)
Connectors: C-102, C-129
AC708953AG
Connector: C-212
AC708972BG
Connectors: C-301, C-316
ETACS-ECU
C-301
C-316
AC708954 AU
Connectors: D-02, D-06
D-02
D-06 (GR)
AC608167AF
Connector: E-15
TROUBLESHOOTING
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LOCAL INTERCONNECT NETWORK (LIN)
54B-23
.
TROUBLE JUDGMENT
The ETACS-ECU will set DTC U1515 when no com-
munication has been carried out for more than a cer-
tain period after the slave task received last valid
data.
.
TROUBLESHOOTING HINTS
• The ETACS-ECU may be defective.
• The slave ECU may be defective.
• LIN bus lines shorted to power supply
• LIN bus lines shorted to ground
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB992006: Extra Fine Probe
• 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. Check the following connectors.
Check the following connectors:
• Column switch connector C-212
• ETACS-ECU connectors C-301 and C-316
• Sunroof motor assembly connector D-06 <Vehicles with
sunroof>
• Power window main switch connector E-15
• Lighting control sensor connector D-02 <Vehicles with auto
light function>
Q: Are all the connectors in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
TROUBLESHOOTING
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LOCAL INTERCONNECT NETWORK (LIN)
54B-24
STEP 2. Check the following wiring harness.
Check the wiring harness between the following connectors:
• Wiring harness from ETACS-ECU connector C-301 (termi-
nal 1) to column switch connector C-212 (terminal 3)
• Wiring harness from ETACS-ECU connector C-316 (termi-
nal 1) to sunroof motor assembly connector D-06 (terminal
7)
• Wiring harness from ETACS-ECU connector C-301 (termi-
nal 1) to power window main switch connector E-15 (termi-
nal 7)
• Wiring harness from ETACS-ECU connector C-316 (termi-
nal 1) to lighting control sensor connector D-02 (terminal 3)
NOTE: Also check joint connector C-102 and intermediate con-
nector C-129 for loose, corroded, or damaged terminals, or ter-
minals pushed back in the connector. If joint connector C-102
or intermediate connector C-129 is damaged, repair or replace
the connector as described in GROUP 00E, Harness Connec-
tor Inspection
.
Q: Are all the wiring harness wires in good condition?
YES : Go to Step 3.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.
STEP 3. Measure the voltage at the LIN bus lines.
Check the LIN bus lines for short to power supply.
(1) Disconnect all the ECU connectors which are connected to
the LIN bus lines.
(2) Turn the ignition switch from "LOCK" (OFF) to "ON" position
.
AC608254 CW
Harness side: C-212
(3) Measure the voltage between column switch connector
C-212 (terminal 3) and ground.
• The voltmeter needle does not swing.
NOTE: If the LIN bus lines are short to power supply, the
voltmeter indicates a constant value.
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