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APPENDIX 2.0 SENSOR DIAGNOSTICS AND STATUSES
Sensor diagnostics are included in the handheld. If one of the main sensors has some type of error, a small, blinking red circle will appear
in the upper right of the screen. To navigate to the diagnostics, select MONITOR and DIAGNOSTICS. If there is an issue, an error will
also be shown on any of the MONITOR or GAUGES screens.
Wideband Oxygen Sensor Status – Shows status of wideband oxygen sensors.
Signifies that sensor channel is not enabled.
First shown for an instant when the system is powered on. Displayed so quickly you will likely not see this.
Sensor is below calibrated operating temperature. Unit will still read but accuracy may be impacted.
Sensor is above calibrated operating temperature. Unit will still read but accuracy may be impacted.
General Sensor Status – These are shown for the coolant and air temperature, MAP, TPS, Oil and Fuel pressure sensors. If you do not
have an oil or fuel pressure sensor installed, you will see this error. It will not cause a problem.
Unlikely failure indicated that a sensor is not properly defined.
A sensor displaying this can be unplugged, have an open or short circuit, or be otherwise damaged.
A sensor displaying this can be unplugged, have an open or short circuit, or be otherwise damaged.
RPM (Crank Signal Inputs) Diagnostics – The following are shown for the “RPM” parameter which indicates the status of the crank
sensor/engine speed input.
Signal detected. Position being established.
Will show briefly after crank signal and cam/crank positions established. Actual engine RPM will then be
indicated.
Cam/Crank input error detected.
TPS Diagnostics – The following are shown for the “TPS” parameter.
If you see an error, contact Holley Tech Service.
TPS Autoset needs to be performed.
Closed Loop Diagnostics – Shows status of closed loop operation.
System is in open loop operation.
System is in closed loop operation.
Learn Status – Shows status of learn mode.
Learn is in an active state.
Switched Inputs/Outputs Status – Shows status of switched inputs and outputs.
Input or Output is not active.
Input or Output is active.
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