P0602

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) used in this vehicle utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). The EEPROM contains program information and the calibrations required for powertrain diagnostics operation.

Unlike the Programmable Read Only Memory (PROM) used in past applications, the EEPROM is not replaceable. When the PCM is replaced or a calibration update is required, the PCM must be programmed using approved Techline equipment.

CONDITIONS FOR RUNNING THE DTC
Tested during crank and PCM power up

CONDITIONS FOR SETTING THE DTC
The PCM does not contain the correct program required to operate the vehicle, or has not been programmed.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
^ The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Freeze Frame and/or Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM turns the MIL OFF after 3 consecutive drive trips during which the diagnostic runs and passes.
^ A last test failed, or the current DTC, clears when the diagnostic runs and passes.
^ A History DTC clears after 40 consecutive warm-up cycles, if no other emission related diagnostic failures are reported.
^ Use a scan tool in order to clear the MIL diagnostic trouble code.
^ Interrupting the PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Powertrain Control Module (PCM) Description, Clearing Diagnostic Trouble Codes.

TEST DESCRIPTION

Steps 1-5:

The number below refers to the step number on the diagnostic table.
3. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). If the PCM is replaced, the new PCM must be programmed.