Test for CPS Sensor

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Jul 3, 2025 | 09:58 AM

Loftatsea

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Mountain Pass

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Test for CPS Sensor

I have a 2000 f450 with a 7.3. Ran fine last night and now it cranks but does not start. To test CPS sensor I read I should unplug it and crank the engine. If the RPM gauge does not move it is indicative of a possible bad CPS sensor. Before I unplugged it I cranked the engine and saw the RPM needle move a bit After I unplugged it, the RPM needle did not move at all so I replaced it with a Standard brand CPS. Truck still doesn't start and the RPM needle doesn't move at al when I crank it with the new one in there. No codes either.

Jul 3, 2025 | 10:06 AM

Tpayne621

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Has to be plugged in to read rpm. If it's reading rpm on tach then it's picking up and more then likely jot your issue. If it's plugged IN and NOT reading then it is indicative of a bad one.

Jul 3, 2025 | 11:19 AM

Eman85

Laughing Gas

Joined: May 2024

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From: E TN

Don't remember the year it changes but not all years show on the tach when cranking. Does it have fuel? Does it have fuel pressure? Is the fuel filter full? Is it full of oil?

Jul 3, 2025 | 11:25 AM

Loftatsea

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Mountain Pass

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Yes it has fuel. Pump is filling the bowl when I turn the key on. Oil is good.

Jul 3, 2025 | 11:26 AM

Tpayne621

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Quote:

Originally Posted by Eman85

Don't remember the year it changes but not all years show on the tach when cranking. Does it have fuel? Does it have fuel pressure? Is the fuel filter full? Is it full of oil?

Changed in 02 with the digital odometer clusters.

Jul 3, 2025 | 11:45 AM

INFRNL

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Joined: Apr 2012

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From: Bottom Of Pikes Peak

check the hpop reservoir to see if it is full of oil(within 1" of top)
does it smoke while trying to crank?

Jul 3, 2025 | 02:09 PM

Loftatsea

Thread Starter

Mountain Pass

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HPOP reservoir is full with oil. No smoke when cranking.

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Jul 3, 2025 | 05:33 PM

RacinJasonWV

Lead Driver

Joined: Jul 2017

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From: WV

Quote:

Originally Posted by Loftatsea

Truck still doesn't start and the RPM needle doesn't move at al when I crank it with the new one in there.

Based on this I would put the original CPS back in. It read rpm whereas the new one does not. Non-oem sensors can cause issues or fail in short order.

Jul 4, 2025 | 04:15 PM

#10

corpsedub

Mountain Pass

Joined: Jul 2004

Posts: 245

Likes: 41

You saw the tach move with the original sensor but no start. Is it possible that your new cps is junk. Many dont trust anything but motorcraft/int. Parts(and for good reason).

But let's go back to the original cps and start down the "yes" path:

https://www.ford-trucks.com/forums/a...6&d=1564895572