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My rpm guage is not working even though all the other guages are working perfectly. Scan tool gives me P0335 which says crankshaft position sensor. I've replaced the sensor but no change. I've inspected the reluctor wheel and its in perfect condition. I've checked and rechecked all grounds. I've gone thru the wiring and the crankshaft sensor plug and have no issues with either. I've checked all fuses and relays but all are good. I've changed the fuse box but no change. If anyone has experienced this issue any help would be much appreciated.
What do you mean by “I’ve gone through the wiring” ??…have you ACTUALLY checked this Hall Effect sensor at least with a DVOM ??…a visual inspection is not the way to diagnose this…the sensor has a power (5 volt ref.), ground, and signal wire…was the sensor replaced with an OE one or aftermarket ??
The sensor was replaced with a OE sensor. The sensor has been checked with a dvom and the 5v reference is good along with the signal and ground wire.
How exactly did you check the signal wire and ground ???…what was your procedure ??…if all three were checked the car should start if the sensor was good…are you using a scan tool ??
How exactly did you check the signal wire and ground ???…what was your procedure ??…if all three were checked the car should start if the sensor was good…are you using a scan tool ??
I checked the signal wire and ground with a test light. The car will start but runs rough because it needs a crankshaft sensor relearn. My scan tool will not do the sensor relearn because there's no rpm showing up on the scan tool. Scan tool thinks the car's not running because of no rpm's.
You would check the "low reference" (ground) with a test light connected to battery positive or with a DVOM less than 100 millivolts cranking or running...you wouldn't however check the signal wire with a test light though...if your scan tool shows a CKP "counter" and it increments up during starting and running you can assume the ECM is receiving a signal from the sensor...doing a "bypass test" would also let you know if the ECM was receiving a signal...whether it is receiving the proper signal is another story...the ECM is expecting to see the sensors digital square wave go from 5 volts and then ALL THE WAY to ground as it passes a reluctor tooth...without chasing your tail with this I'd find a diagnostic shop in your area that has a scope and let them scope that signal wire...below is my CKP signal which is a 24 tooth and which uses a 12 volt feed...BTW not doing a crank relearn will not cause the rough running...the relearn just recalibrates the cam-crank relationship and also makes the accuracy of the crank sensor since it is the ECM's misfire monitor more accurate. 24X Crank 1X Cam
I checked the signal wire and ground with a test light. The car will start but runs rough because it needs a crankshaft sensor relearn. My scan tool will not do the sensor relearn because there's no rpm showing up on the scan tool. Scan tool thinks the car's not running because of no rpm's.
If the car is at least running the ECM is receiving some type of signal from the sensor.
A “long” crank time can also be a cam sensor…without a scope you’re only guessing !!
I replaced the cam sensor at the same time i did the crankshaft sensor. On a side note, if i pull the ecm relay while the car is running, the rpm guage will jump up to 5 or 600 rpm and then fall back to 0 as the engine is shutting down.
I replaced the cam sensor at the same time i did the crankshaft sensor. On a side note, if i pull the ecm relay while the car is running, the rpm guage will jump up to 5 or 600 rpm and then fall back to 0 as the engine is shutting down.
Yes it's a mini relay but it's # 61 ECM in my 2014
I can’t find any type of “ECM Relay” in the Powertrain Management wiring section…do you have a pin out for this relay ??…I looked in both the OE and redrawn wiring…can’t see any ??
I can’t find any type of “ECM Relay” in the Powertrain Management wiring section…do you have a pin out for this relay ??…I looked in both the OE and redrawn wiring…can’t see any ??
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RPM Guage Not Working Help!
