Engine Control - Lancer Evolution Mitsubishi Lancer Evolution X

GENERAL INFORMATION

For the accelerator system, an electronic throttle valve control system is utilized, eliminating the accelerator cable.

Scheme 6

INTRODUCTION

If there is a malfunction in the engine control system, the accelerator pedal or throttle body may be faulty.

TROUBLESHOOTING STRATEGY

Use these steps to plan your diagnostic strategy.

If you follow them carefully, you will be sure that you have exhausted most of the possible ways to find an engine control system fault.

1. Gather information from the customer.
2. Verify that the condition described by the customer exists.
3. Find the malfunction by following the Symptom Chart.
4. Verify that the malfunction is eliminated.

SYMPTOM CHART

SYMPTOM CHART

COMMENT

The throttle body or accelerator pedal position sensor is suspected.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)

1. Malfunction of the throttle body.
2. Malfunction of the accelerator pedal position sensor.
3. Malfunction of the engine control module (ECM).

DIAGNOSIS

Required Special Tools

1. 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

Scheme 7

1. STEP 1. Using scan tool MB991958, read the MFI system diagnostic trouble code (DTC). CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Ensure that the ignition switch is at the "LOCK" (OFF) position. Start up the personal computer. Connect special tool MB991827 to special tool MB991824 and the personal computer. Connect special tool MB991910 to special tool MB991824. Connect special tool MB991910 to the data link connector. Turn the power switch of special tool MB991824 to the "ON" position. NOTE: When special tool MB991824 is energized, special tool MB991824 indicator light will be illuminated in a green color. Start the M.U.T.-III system on the personal computer. Turn the ignition switch to the "ON" position. Check for MFI system DTC. (Refer to «MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-lancer-evolution) ). Turn the ignition switch to the "LOCK" (OFF) position, and then remove scan tool MB991958 in the reverse order of installation. Q: Is any DTC set? YES: Repair MFI system. (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-lancer-evolution) ). Then go to Step 2. NO: Go to Step 2.
2. STEP 2. Retest the system. Q: Does the throttle valve fully open and close? YES: The procedure is complete. NO: Return to Step 1 .

The accelerator pedal, its installation condition or the accelerator pedal position sensor is suspected.

1. Malfunction of the accelerator pedal.
2. Incorrectly installed accelerator pedal.
3. Malfunction of the accelerator pedal position sensor.

Required Special Tools

1. 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

1. STEP 1. Check if the accelerator pedal is installed correctly. Q: Is the accelerator pedal installed correctly? YES: Go to Step 2. NO: Remove and reinstall the accelerator pedal (Refer to «ACCELERATOR PEDAL»(/mitsubishi/lancer-evolution/x-2007-2016/remont/engine-control-systems/#engine-control-lancer-evolution) ). Then go to Step 3 .
2. STEP 2. Using scan tool MB991958, read the MFI system DTC. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Ensure that the ignition switch is at the "LOCK" (OFF) position. Start up the personal computer. Connect special tool MB991827 to special tool MB991824 and the personal computer. Connect special tool MB991910 to special tool MB991824. Connect special tool MB991910 to the data link connector. Turn the power switch of special tool MB991824 to the "ON" position. NOTE: When special tool MB991824 is energized, special tool MB991824 indicator light will be illuminated in a green color. Start the M.U.T.-III system on the personal computer. Turn the ignition switch to the "ON" position. Check for MFI system DTC. (Refer to «MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-lancer-evolution) ). Turn the ignition switch to the "LOCK" (OFF) position, and then remove scan tool MB991958 in the reverse order of installation. Q: Is any DTC set? YES: Repair MFI system (Refer to «DIAGNOSTIC TROUBLE CODE CHART»(/mitsubishi/lancer-evolution/x-2007-2016/remont/testing-diagnostics/#multiport-fuel-injection-mfi-lancer-evolution) ). Then go to Step 3. NO: Go to Step 3.
3. STEP 3. Retest the system. Q: Does the accelerator pedal work normally? YES: The procedure is complete. NO: Return to Step 1 .

SPECIAL TOOL

SPECIAL TOOL REFERENCE Tool Tool number and name Supersession Application MB991958 MB991824 MB991827 MB991910 MB991911 MB991914 MB991825 MB991826 Scan tool (M.U.T.-III sub assembly) Vehicle communication interface (V. C. I.) M.U.T.-III USB cable M.U.T.-III main harness A (Vehicles with CAN communication system) M.U.T.-III main harness B (Vehicles without CAN communication system) M.U.T.-III main harness C (for Chrysler models only) M.U.T.-III measurement adapter M.U.T.-III trigger harness MB991824-KIT NOTE: g: MB991826 M.U.T.-III Trigger Harness is not necessary when pushing V.C.I. ENTER key. CAUTION: For vehicles with CAN communication, use M.U.T.-III main harness A to send simulated vehicle speed. If you connect M.U.T.-III main harness B instead, the CAN communication does not function correctly. Checking diagnostic trouble code (DTC)

Scheme 8

Scheme 9

See also:
• MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
• INSPECTION PROCEDURE 1: THROTTLE VALVE WILL NOT FULLY OPEN OR CLOSE