Fault Finding
No Communication
• Check communication cable. Check tat it is plugged in firmly and does not have a
damage. Cables are easily damaged when shut in car doors.
• Make sure that the FIFO buffers are turned off, se help “Windows FIFO setup”
• Make sure you are using correct Com port, “try another port” menu is showed
when trying to go online.
• Check the cable with “check data link” which is viewed when trying to go online.
• Check power to the SM4, Check that the ignition switch input has power when
ignition is on.
• Check that no other software is using the COM port.
No RPM signal
• Check that the Hall Effect or Optical trigger has power if either of these types are
used as Cylinder Pulse trigger.
• Check that the SM4 has +12 volt on both ignition switch and power inputs while
cranking. Some vehicles disconnect power to accessory devices during cranking
to minimize power draw from these devices.
• Check the trigger wiring. If you have access to an oscilloscope , then check the
input to the SM4.
• Check that the software is setup correct under “I/P Crank & Cyl”.
• If using magnetic triggers, make sure you use shielded wires and that the polarity
is wired correctly.
No Spark or Injection pulses
• Check that you have a RPM signal. You should have a cranking speed of 100-300
rpm, if not se above No RPM Signal.
• Check power to your injectors and ignitions coil(S) while cranking.
• Check that all power leads to the ECU has power during cranking.
• Check that the software is configured correctly to match your ignition setup.
• If injectors are firing but there are no spark the most common cause will be the
reference sensor. Check that there are no “Sync Errors” reported and there is a
good Reference signal from the cam sensor.
• If you got an oscilloscope, check the injector/ignition outputs for a pulsing signal.
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