Vehicle: 2007 Volkswagen Eos (1F7) L4-2.0L Turbo
Problem: This VW came to the shop with the MIL
(Malfunction Indicator Light) on and the customer’s concerns were
that the vehicle had no power and no throttle response. The
vehicle would go into limp-in mode anytime there was a load on
Details: The technician retrieved DTC 005445
(P1545) – Throttle Valve Controller Malfunction. With a scan
tool, the technician checked the Accelerator Pedal Position (APP1
and APP2) sensors and the Throttle Position (TP1 and TP2) sensor
data to be sure there were no glitches and that they all followed
each other properly. With the key “On Engine Off” and while
pressing the accelerator pedal through its full sweep, all of the
sensors worked normally.
Since all of the throttle position sensors were operating
normally and the problem only occurred with the engine running
under a load, the Tech-Assist Consultant advised the technician
to check the camshaft (CMP) and crankshaft (CKP) sensors with a
scope, even though there were no codes for those sensors.
Confirmed Repair: The technician connected a
scope and noticed that the CKP pattern had only 2 volts of
amplitude at idle when it should have had 7-8 volts. He replaced
the CKP sensor, cleared the codes and test drove the vehicle. The
throttle valve controller code did not come back and the
drivability problem was fixed. See CKP scope pattern comparison
The red pattern shows the bad CKP sensor at idle with low
amplitude (2v) reading.
The blue pattern shows the new CKP sensor at idle with a the
correct (9-10v) amplitude.