Mitsubishi Evolution X. Manual - part 221

 

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Mitsubishi Evolution X. Manual - part 221

 

 

AUTO-CRUISE CONTROL

TSB Revision

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 

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 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 

P.17-44

, 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 

P.00-15

).

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

Control Module (ECM) 

P.13A-920

]. 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 11  .

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

TSB Revision

ENGINE AND EMISSION CONTROL

17-54

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 

P.17-10

).

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

P.17-10

).

(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 

P.54C-14

). 

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 

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

).

(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 

P.35C-20

). Then go to Step 6.

NO :  Go to Step 3.

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-55

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

).

(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 

P.13A-44

). 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 

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 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 

Control Module (ECM) 

P.13A-920

]. 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.

STEP 5. Retest the system
Q: Does hunting occur?

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

Control Module (ECM) 

P.13A-920

]. 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. Retest the system
Q: Does hunting occur?

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

AUTO-CRUISE CONTROL

TSB Revision

ENGINE AND EMISSION CONTROL

17-56

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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