Lancer Sportback L4-2.4L (4B12) (2010)
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1. Connect scan tool MB991958 to the data link connector. See: Reading and Clearing Diagnostic Trouble Codes/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. See: Scan Tool Testing and Procedures/How to Diagnose the Can Bus Line
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Repair the CAN bus lines (Refer to Diagnosis - Can Bus Diagnostic Chart.) See: Powertrain Management/Computers and Control
Systems/Information Bus/Testing and Inspection/Scan Tool Testing and Procedures/CAN Bus Diagnostics Table Then go to Step 6.
STEP 2. Using scan tool MB991958, check for CVT system DTC.
1. Connect scan tool MB991958 to the data link connector. See: Reading and Clearing Diagnostic Trouble Codes/How to Connect the Scan Tool
(M.U.T.-Iii.)
2. Turn the ignition switch to the "ON" position.
3. Check for CVT system DTC (Refer to Diagnosis - Diagnostic Function.) See: Transmission and Drivetrain/Continuously Variable
Transmission/Transaxle/Testing and Inspection/Initial Inspection and Diagnostic Overview
Q: Is any DTC set?
YES : Repair the CVT system (Refer to Diagnosis - Diagnostic Trouble Code Chart.) See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Descriptions/Continuously Variable Transaxle (CVT) 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. See: Reading and Clearing Diagnostic Trouble Codes/How to Connect the Scan Tool
(M.U.T.-Iii.)
2. Turn the ignition switch to the "ON" position.
3. Check for MFI system DTC (Refer to MFI Diagnosis - Diagnostic Function.) See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Function
Q: Is any DTC set?
YES : Repair the MFI system (Refer to MFI Diagnosis - Diagnostic Trouble Code Chart.) See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Descriptions 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. See: Reading and Clearing Diagnostic Trouble Codes/How to Connect the Scan Tool
(M.U.T.-Iii.)
2. Turn the ignition switch to the "ON" position.
3. Set scan tool MB991958 to data reading mode for cruise control system. See: Reading and Clearing Diagnostic Trouble Codes/How to Connect
the Scan Tool (M.U.T.-Iii.)
-
Item 04: Vehicle speed.
Q: Is the check result satisfactory?
YES : Go to Step 5.
NO : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Diagnosis - ID Code Registration Judgment Table.)
See: Body and Frame/Body Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/ID Codes Registration Judgment Table
Then go to Step 6.
STEP 5. Check the symptoms.
Q: Does hunting occur?
YES : Replace the ECM. When the ECM is replaced, register the encrypted code (Refer to Diagnosis - ID Code Registration Judgment Table.)
See: Body and Frame/Body Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/ID Codes Registration Judgment Table
