For K-series engines that use a drive-by-cable throttle body, the MAP + TPS sensor’s both share the same style 3-wire oval connector. These connectors can easily be crossed when reconnecting them if not labeled or made aware of. A common issue that results from crossing these plugs is blowing out the MAP sensor. Unfortunately, when this happens there is no CEL that kicks on when the MAP blows out under this specific condition.
Symptoms of a blown MAP sensor due to connector crossing:
- Engine is hard to start or won’t start
- Hiccups like it wants to start but won’t start
- Engine runs but sounds really rough
- Idle is rough and can stall often
- Doesn’t rev up smoothly like a properly running engine
- Heavy gas fumes
- KPRO in live mode reads a positive MAP pressure
A tip for preventing this from happening is paying attention to the TPS and MAP connector wire colors and simply marking the connector too.
TPS connector factory wire colors:
yellow w/green stripe (right) (A10 – sensor ground from ecu)
red w/black stripe (A15 – signal)
green w/yellow stripe (A20 – sensor voltage)
MAP connector factory wire colors:
green w/white stripe (right) (A11 – sensor ground from ecu)
green w/red stripe (middle) (A19 – signal)
yellow w/red stripe (left) (A21 – sensor voltage)