Mitsubishi Evolution X. Manual — part 560
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-147
DTC C1915: Transmitter OFF Mode 1
DTC C1925: Transmitter OFF Mode 2
DTC C1935: Transmitter OFF Mode 3
DTC C1945: Transmitter OFF Mode 4
CAUTION
If there is any problem in the CAN bus lines, an incorrect
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C,
Trouble code diagnosis
.
DTC SET CONDITION
When the TPMS transmitter(s) is in the OFF MODE, this code
is set.
.
TROUBLESHOOTING HINTS
The most likely causes for this DTC to set are:
• OFF mode cancellation not performed
• Damaged wiring harness and connector
• Malfunction of TPMS transmitter
• Malfunction of KOS-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
STEP 1. M.U.T.-III CAN bus diagnostics
Use scan tool to diagnose the CAN bus lines.
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus lines (Refer to GROUP 54C
−
CAN Bus Diagnostics table
). On
completion, go to Step 2.
STEP 2. Diagnostic trouble code recheck after resetting
CAN bus lines
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1915, C1925, C1935 or C1945 set?
YES : Go to Step 3.
NO : The procedure is complete.
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-148
STEP 3. Diagnostic trouble code check
(1) Drive the vehicle for five minutes.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(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: Are the all DTC C1915, C1925, C1935 and C1945 set?
YES : Replace the TPMS transmitters of all the four wheels,
and register ID codes (Refer to
). Then go
to Step 4.
NO : Register the ID codes (Refer to
). Then go
to Step 4.
STEP 4. Diagnostic trouble code recheck after register the
ID codes
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1915, C1925, C1935 or C1945 set?
YES : Replace the KOS-ECU and register the ID codes
(Refer to
). Then start over at Step 1.
NO : The procedure is complete.
DTC U0019: Bus off (CAN-B)
CAUTION
• If DTC U0019 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DIAGNOSTIC FUNCTION
If the CAN-B circuit malfunction occurs, the combina-
tion meter sets DTC U0019.
.
JUDGMENT CRITERIA
If KOS-ECU cannot perform the data transmission in
normal conditions due to a malfunction of the CAN-B
bus circuit, KOS-ECU determines that there is a
problem.
.
TROUBLESHOOTING HINTS
The CAN bus line may be defective
DIAGNOSIS
Required Special Tools:
• 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
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-149
STEP 1.Recheck for diagnostic trouble code.
Check again if the DTC is set to the KOS-ECU.
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) Turn the ignition switch from "LOCK" (OFF) position to "ON"
position.
(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 2.
NO : The trouble can be an intermittent malfunction (Refer
to GROUP 00
− How to use
Troubleshooting/inspection Service Points
− How to
Cope with Intermittent Malfunction
STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
(1) Turn the ignition switch to the "ON" position.
(2) Diagnose the CAN bus line.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be 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 CAN bus line (Refer to GROUP 54C,
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
DIAGNOSIS
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KEYLESS OPERATION SYSTEM (KOS)
42B-150
DTC U0141: ETACS-ECU CAN timeout
CAUTION
• If DTC U0141 is set, be sure to diagnose the
CAN bus line.
• When replacing the ECU, always check that
the communication circuit is normal.
.
DIAGNOSTIC FUNCTION
If the signal from ETACS-ECU cannot be received,
the KOS-ECU sets DTC U0141.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus line
• Malfunction of KOS-ECU
• Malfunction of ETACS-ECU
DIAGNOSIS
Required Special Tools:
• 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
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line
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) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. Using scan tool MB991958, read the ETACS-ECU
diagnostic trouble code
Check again if the DTC is set to the ETACS-ECU.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU (Refer to GROUP 54A
−
ETACS, Diagnosis
).
NO : Go to Step 3.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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