4 Section 1: Diagnostic Introduction
Use MIL to Read DTCs
Proceed as follows:
1. Verify that battery voltage is above 12v.
2. Turn Ignition key OFF for ten seconds.
3. Turn Ignition key ON-OFF-ON-OFF-ON
(but do not start the engine).
NOTE: No more than 2.5 seconds can
elapse between each ON and OFF cycle
or the routine is aborted.
4. When performed correctly, the MIL begins
to fl ash the fi rst of four digits.
NOTE: While each DTC actually begins
with the letter “P,” only the numeric charac-
ters are fl ashed.
5. Also, the fi rst digit of every DTC is zero,
which is represented as a series of ten
fl ashes before the fi rst one second pause.
6. Count the number of fl ashes after the fi rst
one second pause to obtain the second
digit of the DTC.
7. Count the number of fl ashes after the sec-
ond one second pause to obtain the third
digit, and then count the number of fl ashes
after the third one second pause to obtain
the fourth digit.
8. Write down each digit as it is displayed.
9. If there is more than one DTC, the next
DTC begins to fl ash after a three second
pause.
10. After all DTCs are reported, the number
“61” is fl ashed to indicate this condition
to the technician. The fl ashing sequence
is then restarted and the technician may
choose to verify the DTCs written down or
exit the routine.
NOTE: If “61” is the fi rst code fl ashed, then
no active DTCs are set.
Use Tiny Scan Code Reader
to Read/Clear DTCs
Proceed as follows:
NOTE: Always follow steps 1-9 for an accurate
report of current DTCs. Failure to do so may
generate a report that includes historic codes.
1. Obtain Briggs & Stratton Tiny Scan Code
Reader (Part No. 19626).
2. Connect code reader to DLC.
3. Turn Ignition ON, Engine OFF.
NOTE: If the Tiny Scan Code Reader can-
not connect to the ECM, “no-C” is dis-
played, which stands for “no communica-
tion.” If communication is established, the
= P0337 CKP Sensor No Signal
= 61 End Code
= 6
=1
One second pause
Three second pause
= 0
= 3
= 3
= 7
First one second pause
Second one second pause
Third one second pause
First digit (always 0)
Second digit
Third digit
Fourth digit
Figure 1-1 MIL Flash Sequence.
Figure 1-2 Data Link Connector (DLC).
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