Mitsubishi Lancer Evolution X. Manual - part 117

CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

17-55

STEP 10. Using scan tool MB991958, check data list item 
88: Neutral switch <TC-SST.>
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for cruise 

control system (Refer to 

P.17-10

.)

• Item 88: 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".

Q: Is the switch operating properly?

YES : Go to Step 11.
NO :  Repair the shift lever system (Refer to 

P.17-44

, 

Symptom Procedures − Inspection Procedure 3.) Then 

go to Step 12.

STEP 11. Check the symptoms.
Q: Can cruise control be set?

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 

P.00-15

.)

NO :  Replace the ECM [Refer to GROUP 13A, Engine 

Control Module (ECM) 

P.13A-888

.] When the ECM is 

replaced, register the encrypted code (Refer to 
GROUP 42C, Diagnosis − ID Code Registration 

Judgment Table 

P.42C-9

.) Then go to Step 12.

STEP 12. Check the symptoms.
Q: Can cruise control be set?

YES : The procedure is complete.
NO :  Return to Step 1.

CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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Inspection Procedure 6: Hunting (Repeated Acceleration and Deceleration) Occurs at the Set Vehicle 
Speed.

.

COMMENT

• The wheel speed sensor signal (vehicle speed 

signal) or the throttle body is suspected.

• The wheel speed sensor signal (vehicle speed 

signal) 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 throttle body.
• Malfunction of the ECM.

DIAGNOSTIC PROCEDURE

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 incorrect 
diagnostic trouble code (DTC) may be set. Prior to this 
diagnosis, diagnose the CAN bus lines (Refer to GROUP 
54C, Trouble code diagnosis 

P.54C-9

.)

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 to the data link connector 

(Refer to 

P.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line (Refer to 

P.17-10

.)

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 

P.54C-15

.) 

Then go to Step 6.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 2. Using scan tool MB991958, check for ASC system 
DTC.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Check for ASC system DTC (Refer to GROUP 35C, 

Diagnosis − Diagnostic Function 

P.35C-8

.)

Q: Is any DTC set?

YES : Repair the ASC system (Refer to GROUP 35C, 

Diagnosis − Diagnostic Trouble Code Chart 

P.35C-22

.) Then go to Step 6.

NO :  Go to Step 3.

STEP 3. Using scan tool MB991958, check for MFI system 
DTC.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Check for MFI system DTC (Refer to GROUP 13A, 

Diagnosis − Diagnostic Function 

P.13A-9

.)

Q: Is any DTC set?

YES : Repair the MFI system (Refer to GROUP 13A, 

Diagnosis − Diagnostic Trouble Code Chart 

P.13A-48

.) Then go to Step 6.

NO :  Go to Step 4.

STEP 4. Using scan tool MB991958, check data list item 04: 
Vehicle speed.
(1) Connect scan tool MB991958 to the data link connector 

(Refer to 

P.17-10

.)

(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to data reading mode for cruise 

control system (Refer to 

P.17-10

.)

• Item 04: Vehicle speed.

Q: Is the check result satisfactory?

YES : Go to Step 5.
NO :  Replace the ECM [Refer to GROUP 13A, Engine 

Control Module (ECM) 

P.13A-888

.] When the ECM is 

replaced, register the encrypted code (Refer to 
GROUP 42C, Diagnosis − ID Code Registration 

Judgment Table 

P.42C-9

.) Then go to Step 6.

CRUISE CONTROL

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ENGINE AND EMISSION CONTROL

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STEP 5. Check the symptoms.
Q: Does hunting occur?

YES : Replace the ECM [Refer to GROUP 13A, Engine 

Control Module (ECM) 

P.13A-888

.] When the ECM is 

replaced, register the encrypted code (Refer to 
GROUP 42C, Diagnosis − ID Code Registration 

Judgment Table 

P.42C-9

.) Then go to Step 6.

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 

P.00-15

.)

STEP 6. Check the symptoms.
Q: Does hunting occur?

YES : Return to Step 1.
NO :  The procedure is complete.

Inspection Procedure 7: When the "ON/OFF" Switch is Turned ON, "CRUISE" Indicator Light 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.

• 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 (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Malfunction of CAN bus system.
• Damaged harness or connector.
• Malfunction of the combination meter.
• Malfunction of the ETACS-ECU.
• Malfunction of the ECM.

DIAGNOSTIC PROCEDURE

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