Tracker 4WD L4-2.0L VIN C (1999)
Fuel Pump Relay
The fuel pump relay provides power to the electric fuel pump. The fuel pump relay is controlled by the Powertrain Control Module (PCM). The PCM
provides an electrical ground for the coil of the fuel pump relay, which causes the contacts in the relay to close. When the ignition switch is turned to the
START position, the circuit opening relay will be energized for 3 seconds in order to allow the fuel pump to operate and pressurize the system.
The fuel pump will continue to operate if the PCM receives an ignition reference signal while the engine is cranking or the engine is started and running.
The fuel pump operates as long as the fuel pump relay is energized by the PCM. When the fuel pump relay is de-energized, the fuel pump will stop
operating. The fuel pump relay (2) is located in the junction box (3), next to the main relay (1), behind the LH side kick panel of the passenger
compartment.
A/C Condenser Fan Relay
The A/C condenser fan motor, is operated by the A/C condenser fan relay, which is controlled by the PCM. The PCM turns ON the A/C condenser fan
relay under any of the following conditions:
^
The A/C system is operating.
^
ECT sensor indicates that the engine coolant temperature is more than 110°C (230°F).
^
The PCM detects an ECT sensor malfunction.
Malfunction Indicator Lamp (MIL)
The Malfunction Indicator Lamp (MIL) is located in the instrument panel gauge cluster. The MIL is illuminated by the Powertrain Control Module (
PCM) in order to notify the vehicle operator of an engine control system malfunction.
The MIL receives ignition positive voltage anytime the ignition is ON. The PCM illuminates the MIL by providing a ground for the MIL circuit. The
MIL should be illuminated whenever the ignition is ON and the engine is not running. Illuminating the MIL whenever the ignition is ON and the engine
is not running provides a check of the bulb and circuit. The PCM will turn OFF the MIL once the engine is started or running if there are no engine
control system malfunctions.
Many of the conditions for illuminating and extinguishing of the MIL are performed by the PCM in accordance with OBD II regulations. For more
information on the MIL function, refer to Powertrain Control Module (PCM) Description (Common OBD II Systems).
The Powertrain On-Board Diagnostic (OBD) System Check guides the user to the correct diagnosis and repair of the MIL circuit.
A/C Cutout Signal
The Powertrain Control Module (PCM) can prevent the engagement of the A/C compressor clutch through the A/C compressor control module. The
PCM provides a ground signal to the A/C compressor control module that enables the A/C compressor control module to operate the A/C compressor
clutch relay.
The PCM allows the A/C compressor clutch to operate at customer request except during any of the following conditions:
^
The PCM did not receive the A/C request input (idle-up signal) from the A/C compressor control module.
^
Wide Open Throttle (WOT) engine operation.
^
ECT sensor indicates that the engine coolant temperature is more than 110°C (230°F).
^
Engine speed is less than 500 RPM or more than 6,500 RPM.
Cruise Control Throttle Opening Signal (A/T Only)
The PCM sends a signal to the cruise control module indicating a change in throttle valve opening. The cruise control module uses this input in order to
help determine when to request that the PCM turn off the TCC and suspend overdrive operation.
