Tracker 4WD L4-2.0L VIN C (1999)
System Description
The Powertrain Control Module (PCM) will energize the fuel pump relay for 3 seconds when the ignition switch is turned to the ON position. The fuel
pump will operate and pressurize the fuel system when the fuel pump relay is energized. The PCM receives ignition system reference pulses when the
engine is being cranked or when the engine is running. The PCM will continue to energize the fuel pump relay as long as the PCM receives ignition
system reference pulses. The PCM will de-energize the fuel pump relay when ignition system reference pulses are no longer detected.
The fuel supply system delivers fuel to the fuel injectors at a controlled pressure. The controlled fuel pressure is 250-300 kPa (36-43 psi) when the fuel
pump is energized and the engine is not running. The controlled fuel pressure is 210-260 kPa (30-37 psi) when the engine is idling at normal operating
temperatures. The fuel pressure regulator maintains the correct fuel pressure at all times by returning excess fuel to the fuel tank.
Diagnostic Aids
Improper fuel system pressure can result in any of the following conditions:
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The engine cranks but will not start
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The engine cuts out or stalls (may feel like an ignition malfunction)
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A decrease in fuel economy and a decrease in power
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Hard starting
One minute after the fuel pump stops, fuel pressure should hold at approximately 180 kPa (25 psi) or higher.
