Inspection Procedure 1: Engine Malfunctions Due to Insufficient: Diagnosis

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the MFI system diagnostic trouble code.
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.
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.
  
  Fig 1: Connecting Special Tool To Data Link Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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 diagnostic trouble code (Refer to DIAGNOSTIC FUNCTION ) <2.0L ENGINE Non-turbo>, (Refer to DIAGNOSTIC FUNCTION ) <2.0L ENGINE Turbo>, or (Refer to DIAGNOSTIC FUNCTION ) <2.4L ENGINE.>
10. Turn the ignition switch to the "LOCK" (OFF) position, and then remove scan tool MB991958 in the reverse order of installation.
  Q: Is the DTC set?
  1. YES: Repair MFI system (Refer to DIAGNOSTIC TROUBLE CODE CHART ) <2.0L ENGINE Non-turbo>, (Refer to DIAGNOSTIC TROUBLE CODE CHART ) <2.0L ENGINE Turbo>, or ( DIAGNOSTIC TROUBLE CODE CHART ) <2.4L ENGINE>. Then go to Step 6.
  2. NO: Go to Step 2.
STEP 2. Check the fuel pressure.
Release residual pressure from the fuel line to prevent fuel spray (Refer to FUEL PRESSURE TEST ) <2.0L ENGINE Non-turbo>, (Refer to FUEL PRESSURE TEST ) <2.0L ENGINE Turbo>, or (Refer to FUEL PRESSURE TEST ) <2.4L ENGINE.>

Q: Is the fuel pressure in good condition?
1. YES: Go to Step 5.
2. NO: Repair or replace. Then go to Step 3.
STEP 3. Check for bending, twisting or clogging of the fuel main pipe and fuel high-pressure hose.
Q: Are the fuel main pipe and fuel high-pressure hose in good condition?
1. YES: Go to Step 4.
2. NO: Repair or replace the fuel main pipe and fuel high-pressure hose. Then go to Step 6.
  
  Fig 2: Identifying Fuel High-Pressure Hose And Fuel Main Pipe
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
  
  Fig 3: Identifying Fuel High-Pressure Hose And Fuel Main Pipe
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 4. Check the fuel pump module operation.
Refer to FUEL PUMP OPERATION CHECK <2.0L ENGINE Non-turbo>

Refer to FUEL PUMP OPERATION CHECK <2.0L ENGINE Turbo>

Refer to FUEL PUMP OPERATION CHECK <2.4L ENGINE>

Q: Is the fuel pump module operation in good condition?
1. YES: Then go to Step 5.
2. NO: Replace the fuel pump module (Refer to FUEL TANK <2.0L ENGINE Non-turbo, 2.4L ENGINE> ) <2.0L ENGINE Non-turbo, 2.4L ENGINE> or (Refer to FUEL TANK <2.0L ENGINE Turbo> ) <2.0L ENGINE Turbo>. Then go to Step 6.
STEP 5. Check the inside of the fuel tank for contamination and rust.
Remove the fuel tank (Refer to FUEL TANK <2.0L ENGINE Non-turbo, 2.4L ENGINE> ).

Q: Is the fuel tank in good condition?
1. YES: Go to Step 6.
2. NO: Replace the fuel filter, and clean the fuel tank and fuel line. Then go to Step 6.
STEP 6. Retest the system.
Q: Is the engine malfunction eliminated?
1. YES: The procedure is complete.
2. NO: Return to Step 1.