Mitsubishi Lancer (4A9 engine). Manual — part 215
ETACS
CHASSIS ELECTRICAL
54A-522
PROBABLE CAUSES
• Malfunction of CVT-ECU
• Malfunction of A/T-ECU
• Malfunction of the ETACS-ECU
• Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the CVT-ECU, A/T-
ECU.
Q: Is the diagnosis code set to the any of the above?
Set to the CVT-ECU. :
Troubleshoot the CVT. Refer
to GROUP 23A
− Diagnosis code chart .
Set to the A/T-ECU. :
Troubleshoot the A/T. Refer
to GROUP 23C
− Diagnosis code chart .
The diagnosis code is not set. :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0101 is set to the
engine-ECU.
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the CVT-ECU, A/T-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the CVT-ECU, A/T-ECU and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
STEP 5. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the CVT-ECU, A/T-ECU and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
Code No.U0121 ABS/ASC CAN timeout
CAUTION
• If diagnosis code No. U0121 is set to the
ETACS-ECU, always diagnose the CAN bus
line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from ABS-ECU or ASC-ECU cannot be
received, the ETACS-ECU sets the diagnosis code
No. U0121.
JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the ABS-ECU or
ASC-ECU cannot be established for 600 ms or more,
the ETACS-ECU determines that a problem has
occurred.
• No abnormality is present to the network.
• Ignition switch is in the ON position.
• No abnormality is present to the power supply
fuse (IOD fuse), or the odometer value is at 80.5
km or more.
• ETACS-ECU system voltage is at 10−16 V.
ETACS
CHASSIS ELECTRICAL
54A-523
PROBABLE CAUSES
• Malfunction of ABS-ECU
• Malfunction of ASC-ECU
• Malfunction of the ETACS-ECU
• Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ABS-ECU or
ASC-ECU.
Q: Is the diagnosis code set to the any of the above?
Set to the ABS-ECU. :
Troubleshoot the ABS.
Refer to GROUP 35B
− Troubleshooting .
Set to the ASC-ECU. :
Troubleshoot the ASC.
Refer to GROUP 35C
− Troubleshooting .
The diagnosis code is not set. :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0121 is set to the
engine ECU.
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ABS-ECU or ASC-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the ABS-ECU or ASC-ECU and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
STEP 5. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the ABS-ECU or ASC-ECU and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
Code No.U0126 Steering wheel sensor CAN timeout
CAUTION
• If diagnosis code No. U0126 is set to the
ETACS-ECU, always diagnose the CAN bus
line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from steering wheel sensor cannot be
received, the ETACS-ECU sets the diagnosis code
No. U0126.
JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the steering
wheel sensor cannot be established for 600 ms or
more, the ETACS-ECU determines that a problem
has occurred.
• No abnormality is present to the network.
• Ignition switch is in the ON position.
• No abnormality is present to the power supply
fuse (IOD fuse), or the odometer value is at 80.5
km or more.
• ETACS-ECU system voltage is at 10−16 V.
ETACS
CHASSIS ELECTRICAL
54A-524
PROBABLE CAUSES
• Malfunction of steering wheel sensor
• Malfunction of the ETACS-ECU
• Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the steering wheel
sensor.
Q: Is the diagnosis code set?
YES :
Troubleshoot the steering wheel sensor.
Refer to GROUP 35C
− Troubleshooting .
NO :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0126 is set to the
AFS-ECU.
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the steering wheel sensor.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the steering wheel sensor and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
STEP 5. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the steering wheel sensor and the ETACS-
ECU (GROUP 00
− How to use
Troubleshooting/inspection Service Points
−
How to Cope with Intermittent Malfunction ).
Code No.U0131 EPS CAN timeout
CAUTION
• If diagnosis code No. U0131 is set to the
ETACS-ECU, always diagnose the CAN bus
line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from EPS-ECU cannot be received, the
ETACS-ECU sets the diagnosis code No. U0131.
JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the EPS-ECU
cannot be established for 600 ms or more, the
ETACS-ECU determines that a problem has
occurred.
• No abnormality is present to the network.
• Ignition switch is in the ON position.
• No abnormality is present to the power supply
fuse (IOD fuse), or the odometer value is at 80.5
km or more.
• ETACS-ECU system voltage is at 10−16 V.
ETACS
CHASSIS ELECTRICAL
54A-525
PROBABLE CAUSES
• Malfunction of EPS-ECU
• Malfunction of the ETACS-ECU
• Malfunction of the CAN bus
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN bus line (Refer to GROUP
54C
− Troubleshooting ).
STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the EPS-ECU.
Q: Is the diagnosis code set?
YES :
Troubleshoot the EPS. Refer to GROUP
37B
− Troubleshooting .
NO :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis code
Check if the diagnosis code No. U0131 is set to the
engine-ECU.
Q: Is the diagnosis code set?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the EPS-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the EPS-ECU and the ETACS-ECU
(GROUP 00
− How to use Troubleshooting/
inspection Service Points
− How to Cope
with Intermittent Malfunction ).
STEP 5. 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 "LOCK" (OFF)
position to "ON" position.
(3) Check if diagnosis code is set.
Q: Is the diagnosis code set?
YES :
Replace the ETACS-ECU.
NO :
The trouble can be an intermittent
malfunction such as a poor connection or
open circuit in the CAN bus lines between
the EPS-ECU and the ETACS-ECU
(GROUP 00
− How to use Troubleshooting/
inspection Service Points
− How to Cope
with Intermittent Malfunction ).
Code No.U0151 SRS CAN timeout
CAUTION
• If the diagnosis code No. U0151 is set to the
ETACS-ECU, always diagnose the CAN bus
line.
• Before replacing the ECU, ensure that the
communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from SRS-ECU cannot be received, the
ETACS-ECU sets the diagnosis code No. U0151.
JUDGMENT CRITERIA
After the following statuses continue to be true for 5
seconds, if the communication with the SRS-ECU
cannot be established for 2,500 ms or more, the
ETACS-ECU determines that a problem has
occurred.
• No abnormality is present to the network.
• Ignition switch is in the ON position.
• No abnormality is present to the power supply
fuse (IOD fuse), or the odometer value is at 80.5
km or more.
• ETACS-ECU system voltage is at 10−16 V.
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