Nissan Forum banner

1 - 15 of 15 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
Purchase an 01 Pathfinder without an engine it was missing wiring harness for the positive battery terminal. Purchase a JDM Engine from eBay track down the correct harness change front and back engine crank sensor and cam position sensor no spark. Rear crank sensor is getting power 12 volts had trouble checking signal at the coil seems to have voltage even when not cranking. Any ideas would be very helpful thank you
 

·
Sup Mod keeping the peace
Joined
·
7,224 Posts
Purchase an 01 Pathfinder without an engine it was missing wiring harness for the positive battery terminal. Purchase a JDM Engine from eBay track down the correct harness change front and back engine crank sensor and cam position sensor no spark. Rear crank sensor is getting power 12 volts had trouble checking signal at the coil seems to have voltage even when not cranking. Any ideas would be very helpful thank you
Perform an ECU code readout with a portable scan tool to see if there's any fault codes which might help you finding your problem. Both front and rear crank sensors should see 12V with the ignition switch in the ON position. Make sure the engine ground connections are tight and no oxidation.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #5
Perform an ECU code readout with a portable scan tool to see if there's any fault codes which might help you finding your problem. Both front and rear crank sensors should see 12V with the ignition switch in the ON position. Make sure the engine ground connections are tight and no oxidation.
I forgot to mention I did scan it with my scan tool only code is water temperature sensor which I do not have to. As I'm missing the connector which is actually a strange connector into another connector according to the Nissan diagram but not sure that has anything to do with the spark issue. The rear sensor does have 12 volts but the front sensor I did not check for voltage it's a two wire not a 3
 

·
Registered
Joined
·
128 Posts
Thanks I was wondering about that. O2 sensors not hooked up either. Any other ideas?
Just realized yours is an ‘01 Pathy. I’m probably wrong. Hopefully someone smarter than I am can help. But I’m pretty sure you need all those sensors hooked up and functioning properly.
 

·
Sup Mod keeping the peace
Joined
·
7,224 Posts
Thanks I was wondering about that. O2 sensors not hooked up either. Any other ideas?
If the water temp sensor is not connected, the ECU will put the system into "fail safe" operation. The engine has two crankshaft position sensors and one camshaft position sensor; if one or more of the said sensors are not working, then the engine most likely will not start up.
 

·
Registered
Joined
·
31 Posts
The scanner can tell you if the crank sensor (CKP) is working. There will be no engine speed reading while cranking if the CKP is inop. On older V6's, most ECM's won't start the engine if just one cam sensor (CMP) is working, but will start it after a long crank if both CMP's are out. So if the CKP shows good, try pulling the plugs on both CMP's and see if she'll run. To find out quickly if fuel is the issue, squirt some Brakleen down the barrel. If she starts and then dies then you have no fuel delivery.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #12
That's great info thank you! Just came back from the junkyard I needed pigtail to hook up both temperature sensors for the coolant. I don't have that hooked up yet
 

·
Registered
Joined
·
31 Posts
You're most welcome! Amcip1 is right about the ECT sensor just causing the ECM to go "limp", it shouldn't prevent starting. Same for the HO2S's (on an '01 those may not even be diagnosed by the ECM until you get it running). One other thing, since this sounds like a complete swap... make sure the security light isn't lit. On older Path's I recall it's on the lower left dash. If it's solid red then the vehicle has an inductive smart key and it won't start till you get it programmed to the ECM. The security DTC's aren't OBD-II, so most cheap scanners won't pick them up.
 
1 - 15 of 15 Posts
Top