Diagnostic Aids
When TAC module detects a condition within ETC system, PCM receives a message across serial data, and more than one ETC system-related DTC may set. This condition is due to many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Be aware of this condition when you review captured DTC info.
If problem is intermittent, see INTERMITTENT TROUBLE CODE DETERMINATION under SELF-DIAGNOSTIC SYSTEM.