ECM AFRecorder 4800 - Maintenance; Unit-Specific Information; Troubleshooting; Air-To-Fuel Ratio Measurement Failure

Maintenance
Unit-Specific Information
AFRecorder 4800 Serial No.: __________
AFR Sensor Serial No.: ______________ AFR Sensor Serial No.: ______________
Io
2
: __________ Io
2
: __________
Ico: __________ Ico: __________
Ih
2
: __________ Ih
2
: __________
I
1
: __________ I
1
: __________
I
2
: __________ I
2
: __________
ICCl (lean): 5.0 (for typical production engines)
ICCs (stoichiometric): 5.0 (for typical production engines)
ICCr (rich): 5.0 (for typical production engines)
Troubleshooting
Air-to-Fuel Ratio Measurement Failure
The AFR sensing function has failed if the AFRecorder displays "xxxx", "----", "V LO",
or an oscillating %O
2
reading for AFR when the AFR sensor is enabled and in stationary air.
Errors Reported on the AFRecorder's Display
There are two ways that the AFRecorder reports errors: as "ERROR # ..." (where # is a
number) or as "EEPROM Errors Found ...".
"ERROR # ..." is most often caused by the entry of an unrealistic setup parameter or
combination of parameters, or an incorrect “AIR CAL”. Should this occur, all setup
parameters should be verified and at least one sensor parameter constant be reentered (even if
it is already correct). If an incorrect setup parameter cannot be found and normal operation
cannot be restored, contact ECM with the error number and the entered setup parameters.
"EEPROM Errors Found ..." indicates that one or more of the setup parameters stored in the
EEPROM has been corrupted. Usually, this is the result of a severe powerline or signal
surge. If this occurs, the AFRecorder replaces the corrupted setup parameters(s) with default
values. Should this occur, all setup parameters should be verified as the default values may
not be as desired.
Maintenance 43