2001 7.3 repeated CSPS failure
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2nd Gear
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2001 7.3 repeated CSPS failure
My 2001 excursion limited 7.3 Powerstroke 203k miles 4x4 automatic has been a flawless rig up till all of a sudden! Drove to the store couple weeks ago and would not start back up. Replace cam shaft positioning sensor and fires right up couple days later won’t start again in the morning replace the sensor and fired up again this one lasted 3 day then the next 2 days. So I now have replaced the plug in and wires from the cps to the top of the valve covers along with another new cps. That lasted about 4 day and then no start again! Computer is saying there are no codes in the system. After I plugged the scan tool into the OBD port the car started right up and I did nothing but plug the scanner in and it ran all day next morning no start again. It has never stumbled while running or stalled out like a typical cps going out. With a volt meter I ohmed out the sensors and the first 3 were bad and I based that range off of what a new cps/good one ohmed out to. The cps in it now is ohming out the same as a new cps. Has to be a short somewhere for the cps to keep failing I would think but I am not finding a short anywhere. Am I leaning the right way on thinking I may have a failing PCM?
Last edited by Doyle17; Nov 11, 2022 at 09:09 PM.
It's a Van Gogh
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2nd Gear
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Took my multimeter and checked voltage at the plug in to the sensor. I unplugged the sensor and checked voltage at the plug terminals middle connector is giving me a 0.32v reading the connector on the left is reading 0.90 and the one on the right is reading 0 that is with the ignition off. So if I did this correctly voltage is low correct? But the car fired right up after checking the voltage.
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I'm going to add to this and recommend that a new plug kit be installed along with the new CPS. Corrosion from salt, age, rain, whatnot can work it's way in and create resistance that will put the signal enough out of spec to create problems. These trucks are now 20 years old and especially for those of you who live in the rust belt, salt is insidious in how well it can penetrate its way into and travel up the conductor of the wiring harness.
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