When diagnosing engine problems it comes in handy to know the engine firing order. For a 1999 Toyota Camry the firing order is 1-3-4-2.
The 1999 Toyota Avalon OBD 2 port is behind fuse cover
oil barring on 1998 Toyota Avalon blower motor?
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You should replace the water pump on a 1999 Toyota Avalon when it becomes worn out. You can also replace it when it begins leaking.
#1 (From furthest left plug) - Longest wire == ==
I have attached a link to your question that contains the firing orders for just about every Toyota vehicle made in 99'.
19
6
It
The turn signal relay on a 1999 Toyota Avalon is located in the main fuse panel. This can be located under the dash, near the hood release.