TROUBLE CODE DIAGNOSTICS - 7.4L MPI
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5G-37
Code 52 (1 of 2): EEPROM Failure (Non-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 the EFI system.
DIAGNOSTIC AIDS:
If DTC 52 failed more than once, but is intermittent, replace the ECM.
TEST DESCRIPTION:
Number(s) below refer to step number(s) on the diagnostic table.
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. Install Marine Diagnostic Code Tool.
2. Using clear trouble code procedure, clear
trouble code 52.
Refer to
3. Ignition “ON”.
ag-
n
ti
4. Switch Marine Diagnostic Code Tool to
the “Service Mode”.
Aids
Does trouble code 52 reset?
– Step 3
3
Replace faulty ECM and verify trouble code
does not reset.
Is action complete?
–
Verify
Repair
–
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