P1653 fault code interesting stuff
Hi dear alfisti! Trying to be quick on this one...
Today tried once more to investigate a permanent p1653, variator related fault, on my 156 1.8 TS M.Y.2000, Bosch M1.5.5, with tests below.
Steps 1) to 6) were also done on my older 146 1.6 TS M.Y.1997, Bosch M2.10.4, which is faultless, and passed all of them.
1) Checked variator solenoid resistance, 5 to 7 Ohm (10 Ohm on service manual, 33 Ohm on my 146)
2) Reset fault code with MES
3) Started the engine and let it warm a bit
4) Plugged a multimeter on solenoid terminals and checked voltage while accelerating, 0 V (about 14V on my 146)
5) Plugged the multimeter in series with the solenoid, checked current while accelerating, 0 A (about 0,8 A on my 146)
6) Fault code flashed on MES but no engine managment light
7) Fault code reset
8) Fitted a 12 Ohm/17 Watt resistor in series with solenoid
9) Repeated step 4), about 14V
10) Repeated step 5), about 0,8 A
11) No fault code
1) When solenoid has very low resistance, it draws too much current, ECU automatically detects this fault and shuts power down to the solenoid, fault code pops!
2) The 12 Ohm resistor forces to drop current, ECU lets power get to solenoid, no fault code.
3) Seems like the faulty part is the variator solenoid and not the camshaft sensor, which is surprisingly not as expensive as the solenoid (solenoid almost 400 euros here in Portugal!!!!!) but much more complicated to change.
1) Can I drive the car this way, with the 12 Ohm resistor fitted?
2) Is the variator really working this way?
3) Should I trade my 156 solenoid with the one on my 146? Parts are different, but are compatible?
4) What could be causing this lower impedance? This part is usually very relliable.
Last edited by alfizta; 17-09-13 at 20:04.