AEM 30-5132M Analog Boost Metric Gauge - Manual (Page 5)

Page 5
Status Light Fault Corrective Action
Left Sensor Wiring and/or sensor Make sure sensor is
connected, check for
broken wires
Right Sensor and/or sensor wiring Check for shorted
sensor wires
Analog Output
The analog output from the AEM Analog boost gauge is a linear dc voltage signal that
varies from 0.5 Vdc at 30 inHg (-1 Bar) vacuum to 4.5 Vdc at 35 psi (2.4 Bar) boost
over the operating range of the gauge. The signal is used for sending information to a
data logger or an engine management system like the AEM EMS or F/IC. Since the
gauge displays different units for vacuum and boost, two different transfer functions are
needed. The vacuum (inhg) and boost (psi) transfer functions are listed below
Boost Range: 0-35 psi, 1.68 – 4.5 volts
Boost = 12.41 x Voltage – 20.85
Vacuum Range: 0-30 inhg, 0.5 – 1.67 volts
Vacuum = -25.42 x Voltage + 42.71
The transfer function for pressure units in bar is listed below. Since both the vacuum
and boost ranges use the same units, bar, a single transfer function can be used.
Vacuum/Boost Range: -1 Bar Vacuum to 2.4 Bar Boost, 0.5 – 4.5 volts
Vacuum/Boost = 0.85 x Voltage – 1.43
A list of output voltages and corresponding pressures is shown below in Table 1.
Table 1. Error Codes