EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-64 90-860074--1 FEBRUARY 2002
EEPROM Fault (EEPROM and Configuration)
Scan Code: P1680
Blink Code: 1313
Malfunction Indicator Lamp: OFF
7533675336
a-ECM (Engine Control Module)
CIRCUIT DESCRIPTION
The EEPROM Fault code may appear as a result of a calibration failure in the ECM. At
startup the defect memory is read out from the EEPROM and interpreted. Thus a
determination is made concerning how many entries are filed in the defect memory. Failures
may include detected checksum errors, internal ECM communication errors, and even
incorrect numbers stored in the EEPROM.
A failure in the EEPROM circuits should set a Scan Code P1680.
DIAGNOSTIC AIDS:
An intermittent Code P1680 may be caused by a bad cell in the EEPROM that is sensitive
to temperature changes. If the EEPROM failed more than once, but is intermittent, replace
ECM.
An intermittent problem may be caused by a poor or corroded connection, rubbed through
wire connection, a wire that is broken inside the insulation, or a corroded wire.
Any circuitry that is suspected as causing the intermittent complaint should be thoroughly
checked for backed-out terminals, improper mating, broken locks, improperly formed or
damaged terminals, poor terminal-to-wiring connections, corroded terminals and/or wiring,
or physical damage to the wiring harness. After repairs, clear codes following “Clearing
Codes” in “ECM Self-Diagnostics.” Failure to do so may result in codes not properly being
cleared.
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