Description The “Service Throttle Soon” (STS) in the instrument panel alerts the driver to conditions in the accelerator pedal position (APP) circuit that require attention.…
Description The A/C signal comes from the A/C-heater control head in the vehicle and informs the PCM that the driver has turned the air conditioner…
Description The fuel temperature sensor is part of the optical sensor (see figure 5-36). It is a thermistor that controls signal voltage to the PCM.…
Description The Engine Shutoff (ESO) solenoid is located on the injection pump (figure 5-30). When the ignition switch is “OFF,” the ESO solenoid is in…
The PCM has the ability to increase and decrease the amount of fuel to each cylinder to provide smooth idle operation. If the fuel correction…
Fuel Solenoid Driver Circuit Operation The fuel solenoid driver receives an inject-command signal from the PCM on CKT 984 (figure 5-29). The driver provides current-regulated…
Description The 6.5L EFI PCM uses Accelerator Pedal Position (APP) sensors to control fuel delivery as requested by driver demands at the accelerator pedal. Three…
Description The Intake Air Temperature (IAT) sensor is mounted in the intake manifold (figure 5-25). Like the ECT sensor, the IAT is a thermistor that…
Description The Engine Coolant Temperature (ECT) sensor is mounted in the engine coolant stream (figure 5-23). The PCM uses coolant temperature as an indicator of…
The outlet of the transfer pump connects to a threaded restrictor known as the vent wire assembly (figure 5-22). The assembly includes a wire with…