↑ Return to Featured Articles

Fault Management

Fault Management

Fault Managementis a strategy used by the O.E.M. vehicle manufacturers for years to help protect the vehicles powertrain. The tuner has access to numerous conditions the Powertrain controller is always monitoring. This allows the tuner to setup minimum and maximum operating conditions of the powertrain. If any of these conditions are exceeded or have not been met, then a fault is triggered by the PCM. With this fault trigger the tuner can setup a set of actions based upon these triggers. These triggers all have adjustable sample rates to allow the tuner to fine tune what is truly a fault condition or a quick blip in a transition state. When a fault is triggered, a code will be set that can be read from the blinking of a check engine light, or from a laptop connection. ProEFI’s base fault codes are based upon OBDII protocol for faults. These codes are tuner selectable and may be changed by the tuner as well.Example 1: Lean condition – The tuner has set a lean fuel fault condition to trigger a fault at above 12.5 to 1 Air/Fuel ratio when manifold pressure is above 150kpa (7.3psi). The tuner can now go in to the fault management and set condition 1 to trigger a check engine light, condition 2 to set the boost to minimum allowed boost, condition 3 to disengage nitrous control, and condition 4 to enter a cut mode, either ignition or fuel. The tuner can now set this fault can either be released when normal operating conditions are met, held until the ignition key is cycled, or held until the fault condition is reset by the tuner.

Example 2: Fuel pressure variance – One of the biggest problems in today’s high horsepower turbocharged engines is fuel delivery. The ProEFI’s built in strategy to monitor fuel pressure for all types of fuel systems, allows for some really trick safety features. While monitoring fuel pressure, the PCM will see when the fuel pressure is not maintaining the proper pressure ratio across the injector. Although the computer will automatically adjust the injector opening time to maintain the proper air/fuel ratio, if a limit is exceeded, a fault condition will be triggered. The tuner can then setup in the fault management for Conditions 1 to default to base boost, Condition 2 to turn on the check engine light, Condition 3 to disengage nitrous, and condition 4 to enter a cut mode.