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Old 02-10-2010, 11:41 AM   #1
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Default MegaSquirt Lost Sync Reasons

List of Lost Sync Reasons with typical causes. Thought I would post it here since this info is hard to find.



0 = no problem
1 = init error
2 = missing tooth at wrong time
3 = too many teeth before missing tooth (last)
4 = too few teeth before missing tooth (last)
5 = 1st tooth failed test
6 = nonsense input (last)
7 = nonsense input (mid)
8 = too many teeth before missing tooth (mid)
9 = too few teeth before missing tooth (mid)
10 = too many teeth before end of sequence
11 = too few teeth before second trigger
12 = too many sync errors
13 = dizzy wrong edge
14 = trigger return vane size
15 = EDIS
16 = EDIS

special wheels
20 = subaru 6/7 tooth 6 error
21 = subaru 6/7 tooth 3 error
22 = Rover #2 missing tooth error
23 = 420A long tooth not found
24 = 420A cam phase wrong
25 = 420A
26 = 420A
27 = 420A
28 = 36-1+1
29 = 36-2-2-2
30 = 36-2-2-2
31 = Miata 99-00 - 2 cams not seen
32 = Miata 99-00 - 0 cams seen
33 = 6G72 - tooth 2 error
34 = 6G72 - tooth 4 error
35 = Weber-Marelli
36 = CAS 4/1
37 = 4G63
38 = 4G63
39 = 4G63
40 = Twin trigger
41 = Twin trigger
42 = Chrysler 2.2/2.5
43 = Renix
44 = Suzuki Swift
45 = Vitara
46 = Vitara
47 = Daihatsu 3
48 = Daihatsu 4
49 = VTR1000
50 = Rover #3
51 = GM 7X
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Old 02-10-2010, 02:39 PM   #2
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That's only uS/MSII specific though no?
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Old 02-10-2010, 02:54 PM   #3
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MS2-E, I think 2.1.0 and later.
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Old 02-10-2010, 06:18 PM   #4
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I get sync lost reason code 39 some times. This usually happend under load and never at idling. Any good way to debug this?
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Old 02-10-2010, 07:37 PM   #5
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I'll see if I can get the list of trouble code descriptions for the special wheels completed. 37-39 are obviously NA miata related.
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Old 02-10-2010, 08:27 PM   #6
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That would be great.

Thanks.
-Raj
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Old 04-28-2010, 03:29 PM   #7
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i get 39 as well, and so far only at cruise, but it's getting worse (about a miss every 10-20 minutes) rpm drops to zero then recovers immediately
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Old 05-15-2010, 03:02 PM   #8
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Any idea the difference between
31 = Miata 99-00 - 2 cams not seen
32 = Miata 99-00 - 0 cams seen

0 seen verses 2 not seen? Does that mean "missed the doublet" as in "only saw one pulse" - where 32 means missed the can entirely?
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Old 05-17-2010, 01:54 PM   #9
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I believe so.
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Old 06-21-2010, 02:03 PM   #10
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updated

0 = no problem
1 = init error
2 = missing tooth at wrong time
3 = too many teeth before missing tooth (last)
4 = too few teeth before missing tooth (last)
5 = 1st tooth failed test
6 = nonsense input (last)
7 = nonsense input (mid)
8 = too many teeth before missing tooth (mid)
9 = too few teeth before missing tooth (mid)
10 = too many teeth before end of sequence
11 = too few teeth before second trigger
12 = too many sync errors
13 = dizzy wrong edge
14 = trigger return vane size
15 = EDIS
16 = EDIS
17 = didn't received the second trigger when expected in wheel mode

space for more common reasons
plus other special reasons for the custom wheels
20 = subaru 6/7 tooth 6 error
21 = subaru 6/7 tooth 3 error
22 = Rover #2 missing tooth error
23 = 420A long tooth not found
24 = 420A cam phase wrong
25 = 420A
26 = 420A
27 = 420A
28 = 36-1+1
29 = 36-2-2-2 semi sync failed
30 = 36-2-2-2 tooth 14 error
31 = Miata 99-00 - 2 cams not seen
32 = Miata 99-00 - 0 cams seen
33 = 6G72 - tooth 2 error
34 = 6G72 - tooth 4 error
35 = Weber-Marelli
36 = CAS 4/1
37 = 4G63
38 = 4G63
39 = 4G63
40 = Twin trigger
41 = Twin trigger
42 = Chrysler 2.2/2.5
43 = Renix
44 = Suzuki Swift
45 = Vitara
46 = Vitara
47 = Daihatsu 3
48 = Daihatsu 4
49 = VTR1000
50 = Rover #3
51 = GM 7X
52 = 36-2-2-2 tooth 30 error
53 = rc51 semi error
54 = rc51 re-sync error tooth 6
55 = rc51 re-sync error tooth 16
56 = rc51 re-sync error tooth 18
57 = Nissan CAS: wrong pattern, e.g. slot length increases but should decrease
58 = Nissan CAS: longest slot test failed
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Old 04-07-2016, 08:31 PM   #11
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What is the most updated list of sync errors?
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