Powertrain Control Module (PCM) Diagnosis

Fuel Supply Components
The fuel supply is stored in the fuel tank. An electric fuel pump, located in the fuel tank with the gage sending unit, pumps fuel through in-line fuel filter to the fuel rail assembly. The pump provides fuel at a pressure greater than is needed by the injectors. The pressure regulator, part of the fuel rail assembly, keeps fuel available to the injectors at a controlled pressure. Unused fuel is returned to the fuel tank by a separate line.

Powertrain Control Module (PCM)
A faulty PCM will be determined in the diagnostic tables. Before replacing the PCM, a re-programming procedure should not be attempted unless instructed.
If the re-programming is unsuccessful a DTC P0602 will set.