7.10 CAN bus / Testmodes 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• 14: Oil pressure out of range
• 15: Fuel pressure sensor out of range
• 16: EGT safety shutdown triggered
• 17: AFR safety shutdown triggered
7.10.12 Limp Mode
After detecting a sensor fault, the MS3Pro can take action based on what it has detected - either substitute a
replacement sensor reading, ignore the sensor, or use an alternate sensor. The limp mode can also impose a
low rev limit and limit boost. The purpose of the limp mode is to get you home or off the race-track etc. without
damaging the engine. Certain faults will cause poor operation; the aim is to allow some operation in preference to
no operation.
Here is what action the MS3Pro can take in response to sensor failures.
• MAP sensor failure: The MS3Pro can either continue running on the MAP sensor but apply the rev and boost
limits, or it can substitute a fallback MAP table that guesses the MAP reading based on throttle position and
RPM.
• MAT sensor failure: Substitutes a fixed sensor reading.
• CLT sensor failure: Approximates a coolant sensor reading based on time after start. Note - It’s a good idea
to set the warmed up value to a point high enough to turn your cooling fan on, if the MS3Pro is controlling
the fans.
• TPS failure: Disables TPS based acceleration enrichment and assumes a zero TPS value.
• EGO sensor failure: Turns off all closed loop O
2
correction.
• Flex fuel sensor failure: Uses the fallback timing addition and fuel multiplier defined on the flex fuel screen.
• MAP triggers limp mode - whether a MAP fault triggers limp mode
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 270
To Next Page
Loading...