System Inspection

Check for fuel pressure
1. Reduce the internal pressure of the fuel pipe and hoses and cover the hose connection with a shop towel to prevent splashing of fuel.
2. Remove the bolt connecting the fuel line to the fuel delivery pipe.
3. Using the fuel pressure gauge adaptor, install the fuel pressure gauge to the fuel pressure gauge adaptor.
4. Apply battery voltage to the terminal for the pump drive and activate the fuel pump: then, with fuel pressure applied, check fuel leakage from the pressure gauge or connection part.
5. Start an engine and warm up to operating temperature.
6. Check for fuel pressure at idle.
  Specification: Fuel pressure at idle: 51 psi (350kPa, 3.5Kg/cm)
  
  Fig 1: Checking Fuel Pressure At Idle
  Courtesy of HYUNDAI MOTOR CO.
7. Is fuel pressure within specification?
  YES
  - Go to "Compression test" below.
  NO
  - Check fuel delivery system.
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
Compression test
1. Perform compression test at 300 RPM.
  Specification:
  
  Approximately: 193 psi (1360kPa, 13.5Kg/cm² )
  
  No more than 10% between highest and lowest cylinder.
  
  Fig 2: Checking Engine Compression
  Courtesy of HYUNDAI MOTOR CO.
2. Is fuel pressure within specification?
  YES
  - Substitute with a known-good PCM and check for proper operation. If the problem is corrected, replace PCM and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Perform leak down test to determine source of low compression.
  - Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.