Mitsubishi Lancer (4A9 engine). Manual — part 273
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-116
connector (CAN1) terminal No.6 and body earth.
OK: 1 k
Ω or more
(3) Measure the resistance between C-04 joint
connector (CAN1) terminal No.17 and body
earth.
OK: 1 k
Ω or more
Q: Is the check result normal?
YES :
Go to Step 10.
NO :
Repair the wiring harness between C-103
spare connector (for audio) and C-04 joint
connector (CAN1).
STEP 10. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint
connector (CAN1) for short to earth (resistance
measurement).
CAUTION
• Disconnect the negative battery terminal. For
details refer to .
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
• Strictly observe the specified wiring harness
repair procedure. For details refer to .
(1) Disconnect ETACS-ECU connector and joint
connector (CAN1), and measure at the wiring
harness side.
(2) Measure the resistance between C-04 joint
connector (CAN1) terminal No.11 and body earth.
OK: 1 k
Ω or more
(3) Measure the resistance between C-04 joint
connector (CAN1) terminal No.22 and body
earth.
OK: 1 k
Ω or more
Q: Is the check result normal?
YES :
Go to Step 27.
NO :
Repair the wiring harness between C-301
ETACS-ECU connector and C-04 joint
connector (CAN1).
STEP 11. Check the wiring harness between C-
122 SRS connector and C-04 joint connector
(CAN1) for short to power supply (voltage
measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.10 and body
earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.21 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 20.
STEP 12. Check the wiring harness between C-60
heater control unit connector <vehicles without
A/C> or C-15 A/C-ECU connector <vehicles with
A/C> and C-04 joint connector (CAN1) for short
to power supply (voltage measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.8 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.19 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES :
Go to Step 13.
NO :
Go to Step 21.
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-117
STEP 13. Check the wiring harness between C-01
combination meter connector and C-04 joint
connector (CAN1) for short to power supply
(voltage measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.9 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.20 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES <vehicles without KOS> :
Go to Step 14.
YES <vehicles with KOS> :
Go to Step 15.
NO (the check result is not normal.) :
Go to Step
22.
STEP 14. Check the wiring harness between C-06
WCM connector and C-04 joint connector (CAN1)
for short to power supply (voltage
measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.7 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.18 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES <vehicles with radio and CD player> :
Go to
Step 16.
YES <vehicles with MMCS (vehicles for Russia)> :
Go to Step 17.
YES <vehicles without MMCS and without radio
and CD player> :
Go to Step 18.
NO (the check result is not normal.) :
Go to Step
23.
STEP 15. Check the wiring harness between C-23
KOS-ECU connector and C-04 joint connector
(CAN1) for short to power supply (voltage
measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.5 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.16 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES <vehicles with radio and CD player> :
Go to
Step 16.
YES <vehicles with MMCS (vehicles for Russia)> :
Go to Step 17.
YES <vehicles without MMCS and without radio
and CD player> :
Go to Step 18.
NO (the check result is not normal.) :
Go to Step
24.
STEP 16. Check the wiring harness between C-
103 radio and CD player connector and C-04 joint
connector (CAN1) for short to power supply
(voltage measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-118
connector (CAN1) terminal No.6 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.17 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Go to Step 25.
STEP 17. Check the wiring harness between C-54
CAN box unit connector and C-04 joint connector
(CAN1) for short to power supply (voltage
measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.6 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.17 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Go to Step 26.
STEP 18. Check the wiring harness between C-
103 spare connector (for audio) and C-04 joint
connector (CAN1) for short to power supply
(voltage measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
(1) Disconnect joint connector (CAN1), and measure
at the wiring harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.6 and body earth.
OK: 5 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.17 and body
earth.
OK: 5 V or less
Q: Is the check result normal?
YES :
Go to Step 19.
NO :
Repair the wiring harness between C-103
spare connector (for audio) and C-04 joint
connector (CAN1).
STEP 19. Check the wiring harness between C-
301 ETACS-ECU connector and C-04 joint
connector (CAN1) for short to power supply
(voltage measurement).
CAUTION
• A digital multimeter should be used. For
details refer to .
• The test wiring harness should be used. For
details refer to .
• Strictly observe the specified wiring harness
repair procedure. For details refer to .
(1) Disconnect ETACS-ECU connector and joint
connector (CAN1), and measure at the wiring
harness side.
(2) Turn the ignition switch to the ON position.
(3) Measure the voltage between C-04 joint
connector (CAN1) terminal No.11 and body earth.
OK: 1 V or less
(4) Measure the voltage between C-04 joint
connector (CAN1) terminal No.22 and body
earth.
OK: 1 V or less
Q: Is the check result normal?
YES :
Go to Step 27.
NO :
Repair the wiring harness between C-301
ETACS-ECU connector and C-04 joint
connector (CAN1).
TROUBLESHOOTING
CONTROLLER AREA NETWORK (CAN)
54C-119
STEP 20. M.U.T.-III CAN bus diagnostics
(checking the SRS-ECU for internal failure)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-122 SRS-ECU connector, and diag-
nose the CAN bus line.
ACB01921AC
M.U.T.
JC
JC
SAS
AT/
CVT
EPS
ENGINE
ABS/
ASC
: Red section on screen
AS&G
ETACS
JC
KOS/
WCM
SRS
A/C
AUDIO
METER
MMCS
Levelling
Cor ner
OK: The display of the M.U.T.-III is as shown
in the figure.
Q: Does M.U.T.-III screen correspond to the
illustration?
YES :
Repair the wiring harness between C-122
SRS-ECU connector and C-04 joint
connector (CAN1).
NO :
Check the SRS-ECU connector, and repair
if necessary. If the SRS-ECU connector is in
good condition, replace the SRS-ECU.
STEP 21. M.U.T.-III CAN bus diagnostics
(checking the heater control unit <vehicles
without A/C> or A/C-ECU <vehicles with A/C> for
internal failure)
CAUTION
Strictly observe the specified wiring harness
repair procedure. For details refer to .
Disconnect C-60 heater control unit connector <vehi-
cles without A/C> or C-15 A/C-ECU connector <vehi-
cles with A/C> connector, and diagnose the CAN bus
line.
ACB01921AC
M.U.T.
JC
JC
SAS
AT/
CVT
EPS
ENGINE
ABS/
ASC
: Red section on screen
AS&G
ETACS
JC
KOS/
WCM
SRS
A/C
AUDIO
METER
MMCS
Levelling
Cor ner
OK: The display of the M.U.T.-III is as shown
in the figure.
Q: Does M.U.T.-III screen correspond to the
illustration?
YES :
Repair the wiring harness between C-60
heater control unit connector <vehicles
without A/C> or C-15 A/C-ECU connector
<vehicles with A/C> and C-04 joint
connector (CAN1).
NO :
Check the heater control unit connector
<vehicles without A/C> or A/C-ECU
connector <vehicles with A/C> connector,
and repair if necessary. If the heater control
unit connector <vehicles without A/C> or A/
C-ECU connector <vehicles with A/C> is in
good condition, replace the heater control
unit <vehicles without A/C> or A/C-ECU
<vehicles with A/C>.
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