P1624

CIRCUIT DESCRIPTION

The PCM performs an internal self-test on it's Random Access Memory (RAM) or read/write memory. If this self-test fails, this DTC sets.

CONDITIONS FOR SETTING THE DTC

^ Ignition voltage is greater than 10 volts.

^ Ignition is ON for 5 seconds.

^ The internal RAM test fails.

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 the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

^ A last test failed (current DTC) clears when the diagnostic runs and does not fail.

^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.

TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. This DTC indicates an internal PCM problem.