Mitsubishi Evolution X. Manual — part 221
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
17-53
STEP 9. Using scan tool MB991958, check data list item 87:
Neutral switch <TC-SST>.
(1) Connect scan tool MB991958 to the data link connector
(Refer to
).
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for cruise
control system (Refer to
).
• Item 87: Neutral switch.
• When shift lever is at the "N", "P", "R" position, the
display on scan tool MB991958 should be "ON".
• When shift lever is other than "N", "P", "R" position,
the display on scan tool MB991958 should be
"OFF".
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the switch operating properly?
YES : Go to Step 10.
NO : Refer to
, Symptom Procedures
− Inspection
Procedure 3. Then go to Step 11.
STEP 10. Check the symptoms.
Q: Can cruise control be set (Is the "COAST/SET" or
"ACC/RES" switch operation available)?
YES : It can be assumed that this malfunction is intermittent
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
NO : Replace the ECM [Refer to GROUP 13A, Engine
]. When the ECM is
replaced, register the encrypted code (Refer to
GROUP 42C, Diagnosis
− ID Code Registration
Judgment Table
STEP 11. Check the symptoms.
Q: Can cruise control be set (Is the "COAST/SET" or
"ACC/REs" switch operation available)?
YES : The procedure is complete.
NO : Return to Step 1.
INSPECTION PROCEDURE 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set
Vehicle Speed.
.
COMMENT
The wheel speed sensor signal (vehicle speed sig-
nal) or the MFI system is suspected.
The wheel speed sensor signal (vehicle speed sig-
nal) is transmitted from the ASC-ECU to the ECM via
CAN bus line.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
• Malfunction of the CAN bus line system.
• Malfunction of the ASC system
• Malfunction of the MFI system
• Malfunction of the ECM.
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
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DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
CAUTION
• If there is any problem in the CAN bus lines, an incor-
rect DTC may be set. Prior to this diagnosis, diagnose
the CAN bus lines.
• Whenever the ECM is replaced, ensure that the CAN
bus lines are normal.
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
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 to the data link connector
(Refer to
).
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line (Refer to
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the check result satisfactory?
YES : Go to Step 2
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis
− Can Bus Diagnostic Chart
Then go to Step 6.
STEP 2. Using scan tool MB991958, check for ASC system
DTC.
(1) Connect scan tool MB991958 to the data link connector
(Refer to
).
(2) Turn the ignition switch to the "ON" position.
(3) Check for ASC system DTC (Refer to GROUP 35C,
Diagnosis
− Diagnostic Function
).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?
YES : Diagnose the ASC system (Refer to GROUP 35C,
Diagnosis
− Diagnostic Trouble Code Chart
). Then go to Step 6.
NO : Go to Step 3.
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
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STEP 3. Using scan tool MB991958, check for MFI system
DTC.
(1) Connect scan tool MB991958 to the data link connector
(Refer to
).
(2) Turn the ignition switch to the "ON" position.
(3) Check for MFI system DTC (Refer to GROUP 13A,
Diagnosis
− Diagnostic Function
).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is any DTC set?
YES : Diagnose the MFI system (Refer to GROUP 13A,
Diagnosis
− Diagnostic Trouble Code Chart
). Then go to Step 6.
NO : Go to Step 4.
STEP 4. Using scan tool MB991958, check data list item 4:
Vehicle speed.
(1) Connect scan tool MB991958 to the data link connector
(Refer to
).
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for cruise
control system (Refer to
).
• Item 4: Vehicle speed.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
(5) Disconnect scan tool MB991958.
Q: Is the check result satisfactory?
YES : Go to Step 5.
NO : Replace the ECM [Refer to GROUP 13A, Engine
]. When the ECM is
replaced, register the encrypted code (Refer to
GROUP 42C, Diagnosis
− ID Code Registration
Judgment Table
STEP 5. Retest the system
Q: Does hunting occur?
YES : Replace the ECM [Refer to GROUP 13A, Engine
]. When the ECM is
replaced, register the encrypted code (Refer to
GROUP 42C, Diagnosis
− ID Code Registration
Judgment Table
NO : It can be assumed that this malfunction is intermittent
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
STEP 6. Retest the system
Q: Does hunting occur?
YES : Return to Step 1.
NO : The procedure is complete.
AUTO-CRUISE CONTROL
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ENGINE AND EMISSION CONTROL
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INSPECTION PROCEDURE 7: When "ON/OFF" Switch is Turned ON, "CRUISE" Indicator Light Inside
Combination Meter does not Illuminate (However, Cruise Control System is Normal).
.
CIRCUIT OPERATION
The ECM detects "ON/OFF" switch "ON" signal to
illuminate the "CRUISE" indicator light on the combi-
nation meter.
The "CRUISE" indicator light illuminate signal is
transmitted from the ECM to the combination meter
via CAN bus line.
.
COMMENT
The CAN bus line between the ECM and the
ETACS-ECU and between the ETACS-ECU and the
combination meter may be defective.
The combination meter, ETACS-ECU or ECM may
also be defective.
.
TROUBLESHOOTING HINTS
• Malfunction of CAN bus system.
• Damaged harness or connector.
• Malfunction of the combination meter.
• Malfunction of the ETACS-ECU
• Malfunction of the ECM
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
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