Diagnostic Instructions
DTC Descriptors
DTC 051: Control Module Electronic Erasable Programming Read Only Memory (EEPROM)
DTC 055: Control Module Internal Performance.
Circuit/System Description
This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM). This diagnostic also addresses if the ECM is not programmed.
Conditions for Setting the DTC
051
The ECM detects that the checksum calculation does not match the expected checksum.
055
The ECM detects an internal condition.
Diagnostic Aids
The following conditions could also set the DTC.
• | Physical damage to the EEPROM |
• | Excessive play or looseness of the EEPROM |
• | Improper installation of the EEPROM |
Circuit/System Testing
Important: If the EEPROM is damaged in any way, replace the EEPROM.
- Ignition ON, observe the DTC information with a scan tool. DTCs 051 or 055 should not set.
⇒ | If DTC 055 failed this ignition, replace the ECM. |
- Replace the EEPROM and clear the DTCs.
⇒ | If DTC 051 failed this ignition, replace the ECM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for ECM replacement, setup, and programming.