How do I test a 1993 volvo crank shaft position sensor?
1993 Volvo 940 2.3
i have followed tests in the Chiltons manual that I have. This manual is too general as to model as it covers many different models of volvo. I need instructions for testing crank position sensor. Vehicle has no spark. Coil checks ok. Thanks for your help, Larry
Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
Which series is it?
1993 940 2.3 non turbo
I have this,
TESTING PROCEDURE :
I did test on crank position sensor and voltage to ecm as per info you sent and everything checks out . Can you help with next step? thanks much Larry
The best way to diagnos that system would be with a scan tool. However, they did use a couple of different ignition setups in that year. The "Bosch" system would have a power stage type of module for the ignition. See if there is a part under the hood that looks like this. You will have to remove the air filter top housing to see. Also, that the distributor is turning when you crank the engine.
Turn ignition OFF and access the power stage by removing the air filter housing top.
The "Bendix" type will be built into the ignition ECU and will be,
The ignition system control unit is located under driver side dash board.
It will look like this,
From what I can tell this system is REX-1. ECM is Bendix. Power stage and coil combo are mounted on strut tower on bracket, drivers side of car, one three wire connector and one two wire connector.
Terminal A of power stage three way connector has 11 volts while cranking engine.
Checked for poor ground. From terminal B of three way connector to ground 0.1 ohm
Checked terminal A of two way connector, Same.
Thank you, Larry
Are you getting any trouble codes?
Trouble code 1-1-1 no fault found. Rotor is turning with engine.
That's all the information that I have on it. Let me opt out and we can relist the case to see if there may be another expert who may have more insight as to what it may be. Thank you for your patience.
when you checked for codes were you in pin 6 of the socket? pin 2 is the F.I. and pin 6 is the ignition system. get back to me on that and I will have some more information for you. Mike
20+ yrs volvo technician, Ase A1-A8, L1, A/C certified
connector a volt meter to terminal "B" on the 2 pin connector and ground. cranking the motor you should have at least 250mv it that is correct needs a new coil/power stage unit. I have seen these fail on several cars. what was you resisatance reading of the crank sensor across terminal 1 and 2 on the 3 pin connector at the firewall for the crank sensor?
connected to #6 in socket.
connected voltmeter to term B in two pin connector to ground. cranked engine shows approximate 495 Mv. Motor started.
Now where do we go? No doubt it will fail again.
Thanks for help, Larry
I would replace the coil/power stage assembly. they can be intermitent. did you have a code in pin #6?
Code in pin #6 was 1-1-1
No codes. I would suggest replacing the coil assembly. that is what I have seen fail other than the crank sesnor.
Did you receive your payment?
Did you get your payment?
I see the accept on there, I'm sure he got it, thanks
I got it thanks Mike