Mitsubishi Lancer (4A9 engine). Manual — part 240
TROUBLESHOOTING
LOCAL INTERCONNECT NETWORK (LIN)
54B-11
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-316 ETACS-ECU
connector, D-02 lighting control sensor
connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Resistance measurement at the D-02
lighting control sensor connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the D-02
lighting control sensor connector terminal No. 2
and the body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 3.
STEP 3. Wiring harness check from D-02 lighting
control sensor connector terminal No. 2 to body
earth
Check the earth wires for open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 4. Voltage measurement at the D-02
lighting control sensor connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the D-02 lighting
control sensor connector terminal No. 1 and the
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Wiring harness check between the D-02
lighting control sensor connector terminal No. 1
and the C-317 ETACS-ECU connector terminal
No. 10
Check the power supply line for open circuit and
short circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-130, and repair if neces-
sary.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 6. Check the wiring harness wires between
C-316 ETACS-ECU connector terminal No. 1 and
D-02 lighting control sensor connector terminal
No. 3.
Check the communication lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the wiring harness.
STEP 7. Check whether the diagnosis code is
reset.
Check again if the diagnosis code is set to the
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the lighting control sensor.
NO :
A poor connection, open circuit, or other
intermittent malfunctions in the LIN bus lines
between the lighting control sensor and the
ETACS-ECU (Refer to GROUP 00
− How to
Cope with Intermittent Malfunction ).
TROUBLESHOOTING
LOCAL INTERCONNECT NETWORK (LIN)
54B-12
Code No.U1006 Security alarm siren LIN timeout <Vehicles with security alarm sensor>
CAUTION
Before replacing the ECU, ensure that the communication circuit is normal.
INTERFACE
CIRCUIT
LIN DRIVE
CIRCUIT
SECURITY
ALARM
SIREN
LIN
CUTOFF
CONTROL
UNIT
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet PU : Purple SI : Silver
Security Alarm Siren LIN Communication Circuit
ETACS-
ECU
FUSE
8
ACA00897
AB
A-78 (B)
Connector: A-78
ACA00891
AB
Connector: C-63 <LHD>
ACA00896
AB
Connector: C-63 <RHD>
ACA00886
AD
Connectors: C-301, C-304, C-312, C-317
<LHD>
ETACS-ECU
C-317
C-301
C-312
C-304
ACA00887
AD
Connectors: C-301, C-304, C-312, C-317
<RHD>
ETACS-ECU
C-317
C-301
C-312
C-304
TROUBLESHOOTING
LOCAL INTERCONNECT NETWORK (LIN)
54B-13
JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U1006
when no signals are received from the security alarm
siren.
PROBABLE CAUSES
• Faulty security alarm siren
• Faulty LIN cutoff control unit
• Malfunction of the LIN bus
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-301, C-304, C-312
and C-317 ETACS-ECU connectors, C-63 LIN
cutoff control unit connector, A-78 security alarm
siren connector
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the defective connector.
STEP 2. Resistance measurement at the A-78
security alarm siren connector
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the resistance between the A-78
security alarm siren connector terminal No. 1 and
the body earth.
OK: Continuity exists (2
Ω or less)
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 3.
STEP 3. Wiring harness check from A-78 security
alarm siren connector terminal No. 1 to body
earth
Check the earth wires for open circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connector A-79, and repair if necessary.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 4. Voltage measurement at the A-78
security alarm siren connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the A-78 security
TROUBLESHOOTING
LOCAL INTERCONNECT NETWORK (LIN)
54B-14
alarm siren connector terminal No. 2 and the
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
STEP 5. Wiring harness check between the A-78
security alarm siren connector terminal No. 2 and
the C-304 ETACS-ECU connector terminal No. 4
Check the power supply line for open circuit and
short circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connector A-79, and repair if necessary.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00
− How to
use Troubleshooting/inspection Service
Points
− How to Cope with Intermittent
Malfunction ).
NO :
Repair the wiring harness.
STEP 6. LIN cutoff control unit check
Check the LIN cutoff control unit. Refer to GROUP
54A
− Security Alarm System .
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Replace the LIN cutoff control unit.
STEP 7. Voltage measurement at the C-312
ETACS-ECU connector.
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Measure the voltage between the C-312 ETACS-
ECU connector terminal No. 9 and the body
earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Go to Step 8.
STEP 8. Wiring harness check between the C-317
ETACS-ECU connector terminal No. 10 and the C-
63 LIN cutoff control unit connector terminal No.
1
Check the power supply line for open circuit and
short circuit.
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the wiring harness.
STEP 9. Wiring harness check between the C-63
LIN cutoff control unit connector terminal No. 8
and the C-312 ETACS-ECU connector terminal
No. 9
Check the power supply line for open circuit and
short circuit.
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-127, and repair if neces-
sary.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
STEP 10. Check the wiring harness wires
between C-301 ETACS-ECU connector terminal
No. 1 and C-63 LIN cutoff control unit connector
terminal No. 7.
Check the communication lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 11.
NO :
Repair the wiring harness.
STEP 11. Check the wiring harness wires
between C-63 LIN cutoff control unit connector
terminal No. 5 and A-78 security alarm siren
connector terminal No. 3.
NOTE: Prior to the wiring harness inspection, check
intermediate connectors A-79 and C-127, and repair
if necessary.
Check the communication lines for open circuit.
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Repair the wiring harness.
STEP 12. Replace the security alarm siren
temporarily, and check whether the diagnosis
code is set.
Check again if the diagnosis code is set to the
ETACS-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from the LOCK (OFF)
position to the ON position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
Replace the security alarm siren.
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