PCM Related Inputs
Air Conditioning Pressure (ACP) SensorThe PCM uses this information for A/C clutch control, cooling fan control and idle speed control.
Air Conditioning Pressure Switch
The A/C Pressure Switch (ACPSW) is either dual function for two speed electric fan applications or single function for all others.
Brake On/Off Switch
The Brake On/Off Switch (BOO) signals the PCM with a battery voltage (B+) signal whenever the vehicle brakes are applied. The signal informs the PCM to disengage the torque converter clutch. On certain applications, the PCM adjusts engine idle speed with brakes applied and A/C turned On, or turns the A/C Off after a calibrated time.
Camshaft Position Sensor
The Camshaft Position (CMP) sensor detects the position of the camshaft to identify when piston number one is at Top Dead Center (TDC) point of its compression stroke. The signal is then supplied to the Powertrain Control Module (PCM) and used for synchronizing the firing of sequential fuel injectors.
Crankshaft Position Sensor
The Crankshaft Position (CKP) sensor is the primary sensor for ignition information to the integrated Ignition Control Module (ICM).
Engine Coolant and Intake Air Temperature Sensors
The Engine Coolant Temperature (ECT) and Intake Air Temperature (IAT) sensors change with temperature. The PCM uses information as correction factors in the calculation of fuel, spark and MAF.
Fan Monitor
The Fan Monitor (FANM) circuit is used by the Powertrain Control Module (PCM) on 2-speed fan applications for diagnostic purposes and confirms that the FANM, Power-To-Low Speed Fan and Power-To-High Speed Fan (if applicable) circuits are not shorted to power.
Fuel Pump Monitor
The Fuel Pump Monitor (FPM) circuit is used by the Powertrain Control Module (PCM) for diagnostic purposes. The PCM can verify that the FPM circuit and the Power-To-Pump circuit are complete from the FPM splice through the fuel pump to ground. This also confirms that the Power-To-Pump or FPM circuits are not shorted to power.
Fuel Pump Driver Module
The Fuel Pump Driver Module (FPDM) communicates diagnostic information to the Powertrain Control Module (PCM) on the Fuel Pump Monitor (FPM) circuit.
Heated Oxygen Sensor
The Heated Oxygen Sensor (HO2S) detects the presence of oxygen in the exhaust and provides feedback to the processor indicating air/fuel ratio in order to achieve a near stoichiometric air/fuel ratio of 14.7:1 during closed loop engine operation. The HO2S generates a voltage between 0.0 and 1.1 volts.
Knock Sensor
The Knock Sensor (KS) converts engine vibration to an electrical signal. The PCM uses this signal to determine the presence of engine knock and to retard spark timing.
Mass Air Flow Sensor
The Mass Air Flow (MAF) sensor measures the amount of air entering the engine. This input also used in determining EPC, shift and torque converter clutch scheduling.
Octane Adjust Shorting Bar
The Octane Adjust (OCT ADJ) shorting bar is used to retard spark timing.
Output Shaft Speed Sensor Or Turbine Shaft Speed Sensor
The Output Shaft Speed (OSS) sensor or Turbine Shaft Speed (TSS) sensor tells the PCM the turbine shaft speed or output shaft rpm. The signal is also used for shift schedules, torque converter clutch scheduling, and determining EPC pressure.
Power Steering Pressure Switch
The Power Steering Pressure (PSP) switch monitors the hydraulic pressure within the power steering system to compensate for additional loads on the engine by adjusting the idle rpm and preventing engine stall during parking maneuvers.
Throttle Position Sensor
The Throttle Position (TP) sensor provides a signal to the PCM that is linearly proportional to the throttle plate/shaft position. Four operating conditions are determined by the PCM from the TP. Those conditions are closed throttle (includes idle or deceleration), part throttle (includes cruise or moderate acceleration), wide open throttle (includes maximum acceleration or de-choke on crank), and throttle angle rate.
Transmission Control Switch
The Transmission Control Switch (TCS) signals the PCM with keypower whenever the TCS is cycled.
Transmission Fluid Temperature Sensor
The Transmission Fluid Temperature (TFT) sensor uses this signal to determine whether a cold start shift schedule is necessary. The cold start shift schedule lowers shift speeds to allow for the reduced performance of cold engine operation.
Transmission Range Sensor
The Transmission Range (TR) Sensor provides an input signal to the Powertrain Control Module (PCM), notifying the PCM of the current transmission shift lever position.
Vehicle Speed Sensor
The Vehicle Speed Sensor (VSS) generates a frequency that is proportional to the speed of the vehicle, to control such parameters as fuel injection, ignition timing, transmission/transaxle shift scheduling and torque converter clutch scheduling.