Engine Manual
Table Of Contents
- Safety Precautions and Instructions
- Introduction
- Service Assistance
- Section 1. Components and Maintenance Locations
- Section 2. Operation
- Section 3. Maintenance
- Section 4. Troubleshooting
- Section 5. Storage
- Section 6. Specifications
18 TP-7095 4/18
Sensors
Air Temperature / Manifold Absolute Pressure (TMAP) Sensor
The Air Temperature / Manifold Absolute Pressure (TMAP) sensor monitors the absolute pressure in the intake manifold. This
sensor also measures the temperature of the incoming air. Data returned by the TMAP sensor prompts the ECM to adjust the
air-fuel mixture as needed.
Camshaft Position Sensor
The camshaft position sensor measures the rotary speed and camshaft turning angle. Through the camshaft position, the ECM
determines the stroke, or cycle, of the engine and optimizes ignition. The sensor, which consists of a permanent magnet and
coil, is integrated into the distributor. When the camshaft is turning, the position wheel (or 1 tooth wheel) passes the sensor at
different speeds and causes a change of magnet resistance at the sensor to produce a changeable signal.
Coolant Temperature Sensor
The engine coolant temperature sensor provides engine coolant temperature data to the ECM. The ECM uses this data to adjust
for cold starting conditions, and regulates various fuel and emission control functions.
Crankshaft Position Sensor
Crankshaft Position Sensor (CPS) measures the rotary speed and crankshaft turning angle. The ECM ensures the ignition timing
for each cylinder depending on the turning signal. The sensor, which consists of a permanent magnet and coil, is installed on
the timing case cover next to the crankshaft pulley. When the crankshaft is turning, the position wheel passes the sensor at
different speeds and causes a change of magnet resistance at the sensor to produce a changeable signal.
Heated Exhaust Gas Oxygen (HEGO) Sensor
The Heated Exhaust Gas Oxygen (HEGO) sensor measures the amount of oxygen present in the exhaust stream to determine
whether the air-fuel ratio is too rich or too lean.
Oil Pressure Sender
The engine oil pressure sender ensures sufficient lubrication throughout the engine. The sender is a pressure valve that is
monitored by the ECM. A drop in pressure will trigger a fault code.
Throttle Position Sensor (TPS)
The electronic throttle control device incorporates an internal Throttle Position Sensor (TPS), which provides output signals to
the ECM as to the location of the throttle shaft and blade. The ECM will use the signal to monitor and adjust the engine speed.