The Manifold Absolute Pressure (MAP) sensor is a variable capacitance sensor that operates on a 5 volt reference signal from the ECM to produce a linear analog voltage signal that indicates pressure. For the MAP sensor function diagram, see Figure “Manifold Absolute Pressure Sensor Function Diagram” . Figure 1. Manifold Absolute Pressure Sensor Function Diagram… Read More »
The Idle Shutdown feature is an optional feature that allows the ECM to shut off the engine if an idle condition has been detected for more than a customer specified programmed period (2 to 120 minutes). Prior to engine shutdown, the Oil/Water Lamp (red) will flash for 30 seconds to warn the driver of the… Read More »
The Intake Air Temperature (IAT) sensor is a thermistor type sensor that has a variable resistance that changes when exposed to different temperatures. When interfaced with the ECM, it produces a 0–5 volt analog signal that will deduce temperature. For IAT sensor function diagram, see Figure “Intake Air Temperature Sensor Function Diagram” . Figure 1.… Read More »
The Engine Oil Temperature (EOT) sensor is a thermistor type sensor that has a variable resistance that changes when exposed to different temperatures. When interfaced with the ECM, it produces a 0 to 5 volt analog signal that indicates temperature. For the EOT sensor function diagram, see Figure “Engine Oil Temperature Sensor Function Diagram” .… Read More »
The Engine Oil Pressure (EOP) sensor is a variable capacitance sensor, that when supplied with a 5 volt reference signal from the ECM, produces a linear analog voltage signal that indicates engine oil pressure. For the EOP sensor function diagram, see Figure “Engine Oil Pressure Sensor Function Diagram” . Figure 1. Engine Oil Pressure… Read More »
For the Engine Data Line (EDL) Diagram, see Figure “Engine Data Line Diagram” . Figure 1. Engine Data Line Diagram Section 27.1.1 Circuit Functions The ECM is programmed with two shift schedules — the Closed Throttle Mode and the Wide Open Throttle Mode. Closed Throttle Mode is for situations with moderate engine load. ECM pin… Read More »
The Engine Coolant Temperature (ECT) sensor is a thermistor type sensor that has a variable resistance that changes when exposed to different temperatures. When interfaced with the ECM it produces a 0 to 5 volt analog signal that indicates temperature. See Figure “Engine Coolant Sensor Function Diagram” . Figure 1. Engine Coolant Sensor Function Diagram… Read More »
The purpose of the Engine Coolant Level (ECL) monitoring system is to signal the driver in the event of a low coolant situation. Depending on the programming of the control module it is also capable of shutting off the engine to prevent damage to the engine due to low coolant level. See Figure “Engine Coolant… Read More »
The Engine Crank Inhibit (ECI) feature of the ECM is used to control the operation of the cranking motor. The ECM prevents the cranking motor from being engaged when the engine is running. The transmission neutral safety switch or clutch switch will prevent the cranking motor from being engaged when the transmission is in gear… Read More »
Follow these procedures to diagnose and correct the Electronic Foot Pedal Assembly and Idle Validation Sensor. Section 23.1.1 Signal Functions The accelerator position sensor is a potentiometer type sensor that, when supplied with a 5 volt reference signal from the ECM provides a linear analog voltage signal that indicates the driver’s demand for power.… Read More »