194002889 - Y049 P0638 - THROTTLE VALVE CONTROL (SC TO EARTH)

The diagnostic equipment signals: Error P0638 (throttle valve control), with detail "short circuit to earth"

This error is detected if there is a short circuit to earth in the circuit connected to Pin 59 of the junction unit for at least 0.24 secs.

0	Preliminary check	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check, in the junction unit under the dashboard, that fuse F35 has not blown (it is the second from the right in the top row)    See B002 JUNCTION UNIT UNDER DASHBOARD	Move on to Step 1	The fuse has blown	Continue carrying out the    See Test 1064BE SUPERCHARGING VALVE PROTECTIVE FUSE CHECK
1	Check on throttle casing operation	ALL OK	PROBLEMS ENCOUNTERED	ACTION
	Check that the integrated throttle casing actuator is working properly by carrying out the    See Test 1060GO CHECK ON OPERATION OF MOTORIZED THROTTLE CASING	End of diagnosis