A power voltage of 5 V is applied to the EGR valve assembly
power terminal (terminal No. 3) from the engine-ECU (terminal No. 71) and earthed to the engine-ECU
(terminal No. 81) from the EGR valve assembly (terminal No. 2).
The sensor signal is inputted to the engine-ECU (terminal No. 57) from the EGR valve
assembly output terminal (terminal No. 1).
The EGR valve assembly detects the position of the EGR
valve and sends the signal to the engine-ECU.
Based on the signal, the engine-ECU performs the feedback control of the EGR valve.
Battery positive voltage is 8 – 16 V
2 seconds later after the ignition switch has been in “ON” position or the engine
has started up.
The EGR valve position sensor output voltage is 4.80 V or more for 0.5 second.
Failed EGR valve position sensor
Open circuit in EGR valve position sensor circuit or loose connector contact