I have a P0722 on my 1996 Vanden Plas the code says engine speed circuit no signal. Does this have something to do with the Crankshaft Position Sensor. If so can someone please shed some light on this. Can I clean CPS and call it a day?

 

P0722 Output speed sensor, no signal

OBD II MONITORING CONDITIONS

Drive vehicle in a forward gear at an engine

POSSIBLE CAUSES

Transmission internal harness speed sensor circuit: open circuit or short circuit to ground
or B+ voltage
Transmission to TCM harness speed sensor
circuit: open circuit or short circuit to ground
or B+ voltage
Output speed sensor failure

Transmission mechanical failure (no drive)

Sounds like a circuit fault rather than a mechanical one.
Check the harness connector to the gearbox for continuity.

bob gauff

 

Thank you very much!! Now this happened after my car stalled for an unknown reason. I only have these codes P0722 and P1775. I have and idea whats P1775: Trans MIL Fault as it may correlate with the transmission selector switch. Also I read where that I can clean my EGR valve. Any thoughts I hate to pick brains but I'm new to these cars and I'm pretty handy and know my way around tools and cars. I'm not a parts changer I can diagnose and troubleshoot but these cars I want to know what I'm doing.

 

FYI - P0722 is typically the sensor failure itself. I've replaced a couple. It could be a connection problem, but I'm betting the sensor is bad.

They usually go "flakey", first failing intermittently, then give out completely. When they're intermittent, you can clear the fault code and everything seems good again, the P0722 comes back.

 

Which sensor should I replace ? Let me know so that I can get rolling again.

 

Start by verifying/checking connections, grounds, shorts anyway, then look to the sensor. Here are the JTIS instructions:

8.1.10 TRANSMISSION SPEED SENSOR, RENEW (4,0L)SRO 44.15.34Raise the hood and fit a fender cover.Raise the vehicle on a ramp.Drain the transmission lubrication system, see Sub-section 8.1.2.Remove the fluid pan, see Sub-section 8.1.7.Displace the transmission speed sensor harness from the valve body rear securing clip.Release and remove the speed sensor and connector retaining clip from the valve body.Displace the speed sensor and connector from the transmission main casing.Disconnect and remove the speed sensor from the harness connector.Clean the speed sensor, retaining clip and mating surface.Connect the new speed sensor to the harness connector.Fully seat the speed sensor into the transmission unit main casing.Fit the speed sensor and connector retaining clip to the valve body, engaging the tangs onto the connector.Fit and tighten the speed sensor and connector retaining clip securing screws.Reposition and fully seat the speed sensor harness into the valve body rear; secure the clip.Refit the fluid pan, see Sub-section 8.1.7.Lower the vehicle on the ramp.Refill the transmission unit with fluid, see Sub-section 8.1.2.Remove the fender cover and lower the hood.

 

Do you have a part Number for the transmission mounted speed sensor. I have a similar problem. Bill W.