Engine compression test

This page covers general engine compression test as implemented in BimCOM and in future also other tools.

No special tools are required to perform the test, no engine component disassembly is needed. This is pure OBD-II diagnostics test.

Test prerequisites:

  • Engine OFF
  • Ignition ON
  • Transmission must be in neutral

Test procedure:

  • Immediately after starting the test, start engine for at least 5 seconds (engine won't start)
  • After stopping starting, do not turn ignition "OFF" (leave it ON, otherwise connection with diagnostic tester may interrupt)

Individual cylinder speed values are displayed (min-max during the test)

Coverage in SECONS diagnostic tools