DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Code 51 (1 of 1): Calibration Memory 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 51 failed more than once, but is intermittent, replace the ECM.
Step
Action
VALUE
YES
NO
PROCEED TO
Was the “On-Board Diagnostic” (OBD) Sys-
tem Check Performed?
1.
–
Step 2.
OBD
Ignition ON.
2.
Clear trouble code 51.
Does Code 51 reset?
Refer to
Diag-
nostic
Aids
–
–
Step 4.
Refer to
Diag-
nostic
Aids
3.
4.
Fault is not present at this time.
-
Replace faulty ECM and verify trouble code 51
does not reset.
Verify
Repair
–
–
Index
Page 5G-86
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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