Mitsubishi Evolution X. Manual — part 208
17-1
GROUP 17
ENGINE AND
EMISSION
CONTROL
CONTENTS
ENGINE CONTROL . . . . . . . . . .
GENERAL INFORMATION . . . . . .
ENGINE CONTROL SYSTEM
DIAGNOSIS . . . . . . . . . . . . . . . . . .
INTRODUCTION . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING STRATEGY . . .
SYMPTOM CHART . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . .
SPECIAL TOOL . . . . . . . . . . . . . . .
ACCELERATOR PEDAL. . . . . . . .
REMOVAL AND INSTALLATION . . . . .
GENERAL INFORMATION . . . . . .
AUTO-CRUISE CONTROL SYSTEM
DIAGNOSIS . . . . . . . . . . . . . . . . . .
INTRODUCTION TO CRUISE CONTROL
SYSTEM DIAGNOSIS . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLESHOOTING
STRATEGY . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC FUNCTION . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE
CHART . . . . . . . . . . . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES . . . . . . . . . . . . . . . . . . .
SYMPTOM CHART . . . . . . . . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . .
ECM TERMINAL VOLTAGE REFERENCE
CHART FOR CRUISE CONTROL SYSTEM
OPERATION . . . . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS . . . . . . . . . . . . . .
ON-VEHICLE SERVICE . . . . . . . . .
CRUISE CONTROL SWITCH CHECK. .
CRUISE CONTROL SYSTEM COMPONENT
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . .
AUTO-CRUISE CONTROL SWITCH . . .
REMOVAL AND INSTALLATION. . . . . .
Continued on next page
17-2
EMISSION CONTROL
MFI - T/C. . . . . . . . . . . . . . . . . . . . . . .
GENERAL INFORMATION . . . . . .
SERVICE SPECIFICATIONS. . . . .
DIAGNOSIS . . . . . . . . . . . . . . . . . .
SPECIAL TOOLS. . . . . . . . . . . . . .
VACUUM HOSES . . . . . . . . . . . . .
VACUUM HOSE ROUTING. . . . . . . . . .
VACUUM CIRCUIT DIAGRAM . . . . . . .
VACUUM HOSE INSTALLATION . . . . .
VACUUM HOSE CHECK. . . . . . . . . . . .
POSITIVE CRANKCASE
VENTILATION SYSTEM . . . . . . . .
GENERAL INFORMATION (POSITIVE
CRANKCASE VENTILATION
SYSTEM) . . . . . . . . . . . . . . . . . . . . . . . .
COMPONENT LOCATION . . . . . . . . . .
POSITIVE CRANKCASE VENTILATION
(PCV) SYSTEM CHECK . . . . . . . . . . . .
POSITIVE CRANKCASE VENTILATION
(PCV) SYSTEM CHECK . . . . . . . . . . . .
EVAPORATIVE EMISSION
CONTROL SYSTEM. . . . . . . . . . . .
GENERAL INFORMATION (EVAPORATIVE
EMISSION SYSTEM) . . . . . . . . . . . . . . .
COMPONENT LOCATION. . . . . . . . . . .
PURGE CONTROL SYSTEM CHECK
(PURGE FLOW CHECK) . . . . . . . . . . . .
EVAPORATIVE EMISSION PURGE
SOLENOID CHECK . . . . . . . . . . . . . . . .
MASS AIRFLOW SENSOR CHECK . . .
No. 1 INTAKE AIR TEMPERATURE
SENSOR CHECK. . . . . . . . . . . . . . . . . .
BAROMETRIC PRESSURE SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . .
ENGINE COOLANT TEMPERATURE
SENSOR CHECK. . . . . . . . . . . . . . . . . .
THROTTLE POSITION SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . .
CRANKSHAFT POSITION SENSOR
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . .
EVAPORATIVE EMISSION CANISTER
AND FUEL TANK PRESSURE RELIEF
VALVE . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
CATALYTIC CONVERTER . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
ENGINE CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-3
ENGINE CONTROL
GENERAL INFORMATION
M1171000100921
For the accelerator system, an electronic throttle
valve control system is utilized, eliminating the accel-
erator cable.
CONSTRUCTION DIAGRAM
AC613376AB
Accelerator pedal assembly
[Built-in accelerator pedal position
sensor (APS)]
Resin arm
Aluminum pedal pad
ENGINE CONTROL SYSTEM DIAGNOSIS
INTRODUCTION
M1171002000351
If there is a malfunction in the engine control system,
the accelerator pedal or throttle body may be faulty.
TROUBLESHOOTING STRATEGY
M1171002100381
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
M1171002200429
Symptom
Inspection procedure
Reference page
Throttle valve will not fully open or close
1
Accelerator pedal operation not smooth (over
acceleration)
2
ENGINE CONTROL
TSB Revision
ENGINE AND EMISSION CONTROL
17-4
SYMPTOM PROCEDURES
Inspection Procedure 1: Throttle Valve will not Fully Open or Close
.
COMMENT
The throttle body or accelerator pedal position sen-
sor (APP sensor) is suspected.
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CASE:)
• Malfunction of the throttle body.
• Malfunction of the APP sensor.
• Malfunction of the engine control module (ECM).
DIAGNOSIS
Required Special Tools:
• 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
STEP 1. Using scan tool MB991958, read the MFI system
diagnostic trouble code (DTC).
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) Ensure that the ignition switch is at the "LOCK" (OFF)
position.
(2) Start up the personal computer.
(3) Connect special tool MB991827 to special tool MB991824
and the personal computer.
(4) Connect special tool MB991910 to special tool MB991824.
(5) Connect special tool MB991910 to the data link connector.
(6) 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.
(7) Start the M.U.T.-III system on the personal computer.
(8) Turn the ignition switch to the "ON" position.
(9) Check for MFI system DTC. (Refer to GROUP 13A, MFI
Diagnosis, Diagnostic Function
− How to Read and Erase
Diagnostic Trouble Codes
).
(10)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 GROUP 13A, MFI
Diagnosis
− Diagnostic Trouble Code Chart
). Then go to Step 2.
NO : Go to Step 2.
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