Rejstřík chybových kódů · medium
P1780
D – 4 Switch circuit malfunction
D – 4 Switch circuit malfunction
Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): TRANS EOBD, TRANS OBD II · Factory MIL flag: 2 · Default action: None (D – 4 Switch signal ignored)
Common causes
- J-Gate adjustment incorrect Selector cable adjustment / installation incorrect Range sensor incorrect installation / adjustment D – 4 Switch to TCM circuit: short circuit, open circuit, high resistance J-Gate ground circuit: open circuit, high resistance TCM Ground circuit: open circuit, high resistance
- J Gate – incorrect setting Selector cable adjustment / installation incorrect Range sensor incorrect installation / adjustment D – 4 Switch to TCM circuit: short circuit, open circuit, high resistance J-Gate ground circuit: open circuit, high resistance TCM Ground circuit: open circuit, high resistance
Quick checks
- Confirm freeze-frame and conditions when the code set
- Inspect connectors, grounds, and harness for the circuit named in the code
- Compare live sensor values vs expected (unplugged/biased sensors are common)