DIAGNOSTICS
SERVICE MANUAL NUMBER 24
90-861327--1 OCTOBER 1999
Page 5G-87
Code 52 (1 of 1): EEPROM Failure
72801
CIRCUIT DESCRIPTION:
This test allows the ECM to check for a calibration failure by comparing the calibration value
to a known value stored in the EEPROM.
This test is also used as a security measure to prevent improper use of calibrations or
changes to these calibrations that may alter the designed function of EFI.
DIAGNOSTIC AIDS:
If DTC 52 failed more than once, but is intermittent, replace the ECM.
Step
Action
Yes
No
PROCEED TO
1.
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
Step 2.
OBD
a. Clear trouble code 52.
Refer to
2.
b. Ignition ON.
Diag-
nostic
Does trouble code 52 reset?
Step 3.
nostic
Aids
3.
Replace faulty ECM and verify trouble code 52 does not
reset.
Verify
Repair
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Index