PZ1556

CIRCUIT DESCRIPTION

The test for DTC 1556 is run for each write or block of writes to the EEPROM. The PZM writes to an EEPROM cell and then reads the data back.

DTC WILL SET WHEN

The data read by the PZM does not match the data written to EEPROM after two consecutive attempts.

DTC WILL CLEAR WHEN

The data read by the PZM matches the data written to the EEPROM

TROUBLESHOOTING HINTS

If DTC PZ 1556 is set, clear DTCs and cycle the ignition. If DTC PZ 1556 is still current, replace PZM.