Compression Check (With Scan Tool)

Perform KOER CYLINDER CONTRIBUTION SELF-TEST under QUICK TEST in SELF-DIAGNOSTICS - EEC V - DIESEL article. Service any DTCs that are present. The following are possible causes for failing this test:

• Broken Compression Rings
• Burnt Or Bent Valves
• Bent Push Rods
• Bent Connecting Rods
• Damaged Rocker Arms
• Faulty Fuel Injector Assembly