Tracker 4WD V6-2.5L VIN 4 (2001)
Electrostatic Discharge (ESD) Damage
NOTE: In order to prevent possible Electrostatic Discharge damage to the PCM, Do Not touch the connector pins or the soldered components or the
circuit board.
Electronic components used in the engine control system are often designed to operate at very low voltages. Electronic components are susceptible to
damage caused by electrostatic discharge. Less than 100 volts of static electricity can cause damage to some of the electronic components. There are
several ways for a person to become statically charged. The most common methods of charging are by friction and by induction. An example of charging
by friction is a person sliding across a car seat. Charging by induction occurs when a person with well insulated shoes stands near a highly charged object
and momentarily touches ground. Charges of the same polarity are drained off leaving the person highly charged with the opposite polarity. Therefore, it
is important to use care when handling and testing electronic components in order to avoid electrostatic charges that can cause electronic component
damage.
Input Components
The PCM supplies a buffered voltage to the various information sensors and switches. The PCM monitors the input components for circuit continuity
and out-of-range values. The PCM also provides performance checking. Performance checking refers to the PCM indicating a fault when the signal from
an input does not seem reasonable (i.e. a Throttle Position (TP) sensor that indicates a high throttle position at low engine loads or low manifold absolute
pressure sensor voltage). The input components may include, but are not limited to the following sensors and switches:
^
The Vehicle Speed Sensor (VSS)
^
The Crankshaft Position (CKP) sensor
^
The Throttle Position (TP) sensor
^
The Engine Coolant Temperature (ECT) sensor
^
The Camshaft Position (CMP) sensor
^
The Mass Air Flow (MAF) sensor
^
The Manifold Absolute Pressure (MAP) sensor
^
The Heated Oxygen Sensors (HO2S)
^
The Fuel Tank Pressure (FTP) sensor
^
The fuel level sensor
^
The Transmission Range (TR) switch
^
The Power Steering Pressure (PSP) switch, if equipped
Output Components
The PCM is responsible for the control and operation of many output components. The PCM controls many components with an electronic switch that
completes a ground circuit when turned ON. The PCM monitors the output components for the proper response to the PCM commands. Components
where functional monitoring is not feasible will be monitored for circuit continuity and out-of-range values if applicable.
Output components to be monitored include, but are not limited to, the following circuits:
^
The Idle Air Control (IAC) valve
^
The Exhaust Gas Recirculation (EGR) valve
^
The main relay
^
The Malfunction Indicator Lamp (MIL) control
^
The A/C compressor control module, or the A/C relay
^
The A/C condenser cooling fan relay
Catalyst Monitor Diagnostic Operation
