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if you clear the codes and crank it over what code will reset first ?
yes it could be
as the 651 code is saying on a shared 5 volts reference that crank sensor and throttle body uses is showing more than 5 volts
if you unplug the crank sensor and clear the codes and crank it over will the 651 still set ?
ok that 651 is again a code set because of the shared 5 volts reference to the crank sensor or throttle body or gas pedal or secondary air pump is shorted or one of those is causing to much power down the signal shared 5 volts
with the crank sensor unplugged and it still setting the code if the wiring looks good to the crank sensor then unplug the throttle body connector will the 651 go away with that unplugged ?
unplugged is fine
ok unplug the gas pedal connector and if it still shows that code then unplug the secondary air pump
with all 4 unplugged will the 651 reset ?
with those all unplugged and that code setting one of those wires to each device shorted causing the code and this issue
if the 5 volt wires are shorted this will happen
or shorted to power or ground or a bad computer
a muti meter is needed next to start to test the 5 volt reference wiring
most shops can nail this down within an hour or so of testing
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