code po340 and po1336 - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 06-17-2016
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code po340 and po1336

i have a 2004 ranger 3.0 with 195000 miles. I had a shop replace the cam position sensor (used a motorcraft one) about 3 months ago since it was in there for something else. the other day driving down the interstate with cruise set the truck bucked then ran fine. i went about 10 more miles, stopped for gas and when i got back on the road got a check engine light that gives the codes in the title. truck runs fine. i found the bolt that holds the cam positioner loose (like 2 turns) took it back to the shop. he said it was out of sync, resync'd it. i got about 3 miles from the shop and the check engine light came back on with the same code. its back at the shop. any suggestions?
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Old 06-17-2016
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The 2 codes are for different sensors

P0340 is an erratic Cam position sensor(CPS/CMP), part that was changed.

P1336 is an erratic Crank Position(CKP) sensor

CKP sensor is on the lower front of the engine, on 3.0l it is behind main crank pulley at about 10:00 position.

It reads a "tone wheel" on the crankshaft, looks like teeth on a gear.
Make sure tone wheel is clean, no mud or ???
And that CKP sensor is tight.
Disconnect its wire connector and make sure it is clean and dry, then reconnect.

CKP sensor is the main timing sensor for spark and fuel, engine won't run without it.
Engine does run so sensor is OK but wiring or being loose would cause issues.
CPS fine tunes fuel injection.

Problem could still be just the CPS because computer compares the two "timing" signals, and if there is a discrepancy, only the CKP signal will be used but computer may set both codes because they don't both match.
Letting driver/mechanic know to check both signals
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Old 06-17-2016
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thanks for the info. i just spoke to the shop and he replaced the whole cam position sensor (mechanical and pickup) reset the code and he said it came back in about 4 miles later, so i don't think my problem is in the cam position sensor. the mechanic even said it runs great. I will definitely look at the crank sensor and clean the connections. I live on a dirt road so it could be dirty. thanks for the information and i will update after i get this done. if i can't get it to clear i think it will be time to part with my ranger after 12 years and 192k miles
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Old 07-01-2016
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So I disconnected negative battery cable, removed electrical connector that goes to the ecm and cleaned the ground wire for the ecm (it wasn't really dirty). Reinstalled ecm harness and reconnected battery cable. I started the truck it ran a little rough for a minute or so but the check engine light stayed out. I have since bought a code scanner and the truck shows no codes. I have driven it for about 500 miles and it seems to be running great. I guess the computer just needed a reboot. I did buy a crankshaft sensor but haven't replace it yet, probably wont now that its running well. Thanks for the input.
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Old 07-01-2016
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Thanks for the update, reads like problem was solved
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