Ignition Switch On (Engine Off)

When the Electronic Ignition Switch/Central GateWay (EIS/CGW) is turned to the ON position, it will send the ON signal to the gas PCM or diesel ECM through the CAN-C bus. When the diesel ECM receives the ON signal, it will send a signal through the LIN bus to actuate the glow plug module, which provides battery voltage to the glow plugs. At the same time, the gas PCM or diesel ECM actuates the fuel pump relay, which battery voltage to the in-tank (low pressure) fuel pump. If the engine is not started within approximately 4 seconds of the gas PCM or diesel ECM receiving the ON signal from the EIS/CGW, the gas PCM or diesel ECM will turn off the in-tank fuel pump.