The function diagram for the BCP sensor includes the following:
• BCP sensor
• Injection Control Pressure (ICP) sensor
• Camshaft Position (CMP) sensor
• Crankshaft Position (CKP) sensor
• Injection Pressure Regulator (IPR)
• Electronic Control Module (ECM)
• Engine Oil Temperature (EOT) sensor
• ENGINE lamp (amber)
The BCP sensor is a Micro Strain Gauge (MSG) sensor. The BCP sensor is under the valve cover, forward of the No. 2 fuel injector in the high-pressure oil rail. The engine harness connection on the valve cover gasket for the BCP sensor is left of the No. 2 injector connector. The ECM supplies a 5 V reference signal which the BCP sensor uses to produce a linear analog voltage that indicates pressure.
The ECM monitors the BCP signal to determine the oil pressure in the brake gallery of the high-pressure oil rail. During engine brake operation, if the ECM recognizes that the BCP signal is greater than desired brake control pressure or less than the ICP signal, the ECM will set a DTC and illuminate the amber ENGINE lamp.