5 - 8 Testing and Fault Finding
K0260 Issue No. 8
TABLE 5-2 SYSTEM SCREEN INFORMATION
Data Identifier Function Expected Display or Value
RPT Diagnostics Ps/Altitude Sensor
RPT Diode [mV] Temperature Compensation 400 (hot) ............. 800 (cold)
RPT Count Value proportional to pressure 248,553 .............4,473,600
TEMP [c] Ps channel (RPT) measured temperature 5°...... 60°C (over permitted ambient range)
PDCR Diagnostics Qc/Airspeed Sensor
PDCR Vc [mV] Temperature Compensation 980 ............. 2100
PDCR Vd [mV] Value proportional tp pressure 0 to 140 mV (always active)
Valve Diagnostics Pressure Output and Control
Ps Output Ps Port isolation valve state L:L <—> H:H (open) —:— (closed)
Pt Output Pt Port isolation valve state L:L <—> H:H (open) —:— (closed)
Ground Ground pressure sense valve state —:— (closed, normal), H:H (at ground)
Qc Zero Qc auto-zero valve state —:— (closed, normal), H:H (at ground, auto-zero)
Pressure Ps Ps pressure valve drive level 0 (Leak/Measure), varying to 9999 (control)
Vacuum Ps Ps vacuum valve drive level 0 (Leak/Measure), varying to 9999 (control)
Pressure Pt Pt pressure valve drive level 0 (Leak/Measure), varying to 9999 (control)
Vacuum Pt Pt vacuum valve drive level 0 (Leak/Measure), varying to 9999 (control)
Pump Diagnostics Controller Source Pressures
Pressure Pressure pump drive state POV (Pressure On Flow) or blank (pump off)
Vacuum Vacuum pump drive state VOF (Vacuum On Flow) or blank (pump off)
Processed information Major Measurement/Control Parameters
Ps
Ps Channel Pressure, mbar absolute 0 to 1355
Qc
Qc Channel Pressure, mbar differential -1355 to 2490
Pt
Pt Channel Pressure, mbar absolute 0 to 3845
ground
Ambient pressure estimate 800 to 1300
Ps VOL
System Ps volume estimate 0.125 (min) varies with connected system
Pt VOL
System Pt volume estimate 0.125 (min) varies with connected system
Characterisation Control Valve Data
PWM PPS VB Valve bias (VB) calculated in real time Variable with temperature
PWM PPS ERR Determined during manufacture or service operations Constant
PWM VPS VB Valve bias (VB) calculated in real time Variable with temperature
PWM VPS ERR Determined during manufacture or service operations Constant
PWM PPT VB Valve bias (VB) calculated in real time Variable with temperature
PWM PPT ERR Determined during manufacture or service operation Constant
PWM VPT VB Valve bias (VB) calculated in real time Variable with temperature
PWM VPT ERR Determined during manufacture or service operations Constant
Tertiary Information Other system control states
CAL: Calibration lock switch state Disabled (normal)
DUMP: Pump pressure vent state Shut (normal)
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