TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-69
Code 52 (1 of 1): EEPROM Failure (Scan)
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.
TEST DESCRIPTION:
Step 2. This step checks to see if the fault is present during diagnosis. If present, the
ECM is not functioning properly and must be replaced.
STEP ACTION VALUE YES NO
PROCEED TO
1
Was the “On-Board Diagnostic” (OBD) System
Check Performed?
– Step 2
Go to
OBD
System
Check
2
1. Clear trouble code 52.
Refer to
2. Ignition “ON.”
ag-
n
ti
Is trouble code 52 reset?
– Step 3
Aids
3
Replace faulty ECM and verify trouble code 52
does not reset.
–
Verify
Repair
–
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