I watch too many car repair videos on youtube to remember which cars have this behavior. But I THINK it might be the Nissans that will run their fans at high speed as soon as you turn on the ignition if there is a comm problem on the CAN bus. Have you scanned for codes? I'm also fairly certain if you have an active U1000 CAN code, it will result in a crank no start condition.
Nissan Murano 2007 Crank no start.
Hello dear members,
I come to you to ask for your help.
Indeed I have a problem which seems to be a short circuit to the ground.
I have a Nissan Murano 2007, 2.5L ZT50 right hand.
At the beginning I had an overheating which was caused by driving without coolant in the radiator. This caused holes in the radiator that made the coolant leak. So the radiator was fixed and put back in place, but the engine continued to overheat. We removed the thermostat hoping to solve the problem, but the engine continued to heat up after about a minute after starting, the high speed fans were not running. A technician came by to fix this problem, after his intervention every time the key is turned on, the highspeed fans immediately turn without stopping. And if I start the vehicle, it cranks but does not start. So I decided to see this problem by myself: Here is what I noticed:
Volia roughly what happens on my vehicle, I beg you to be indulgent with my fears, I do not speak a purely technical language since I am not the field. Thank you in advance.
I come to you to ask for your help.
Indeed I have a problem which seems to be a short circuit to the ground.
I have a Nissan Murano 2007, 2.5L ZT50 right hand.
At the beginning I had an overheating which was caused by driving without coolant in the radiator. This caused holes in the radiator that made the coolant leak. So the radiator was fixed and put back in place, but the engine continued to overheat. We removed the thermostat hoping to solve the problem, but the engine continued to heat up after about a minute after starting, the high speed fans were not running. A technician came by to fix this problem, after his intervention every time the key is turned on, the highspeed fans immediately turn without stopping. And if I start the vehicle, it cranks but does not start. So I decided to see this problem by myself: Here is what I noticed:
- In the fuse box / IPDM there are cables that connect to the E7 connector at the IPM 17 Red Green and 25 Red Yellow that were cut. I have repaired them and put them back in place but there is one that is not powered.
- I have the 12v power from the battery to the IPDM on the E5 connector and the ground. So the battery current is coming cleanly to the IPDM.
- The ECM relay is not working properly, there is a lack of ground on this realais. But when I pick up a ground next to it and connect it to the IPDM, the relay works. Without this ground that I give him manually, the relay does not work and the Engine Light check is not displayed in the dashboard with the key on. From that I connect a mass to him, the relay functions and the chek engine light appears in the dashboard with the key on. The fuel pump is also powered.
- The injectors do not have a ground. On their connector I have the positive current but not the ground.
- I made the test on the connectors of the ECM to see if there is the ground, but no ground.
Volia roughly what happens on my vehicle, I beg you to be indulgent with my fears, I do not speak a purely technical language since I am not the field. Thank you in advance.
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Hello,I watch too many car repair videos on youtube to remember which cars have this behavior. But I THINK it might be the Nissans that will run their fans at high speed as soon as you turn on the ignition if there is a comm problem on the CAN bus. Have you scanned for codes? I'm also fairly certain if you have an active U1000 CAN code, it will result in a crank no start condition.
Sorry for the delay,
I also watched several video and a specially followed the recommendation as per the Nissan Murano's Maintenance book. I performed the checking on the OBD II Terminals as follow :
1. Check power and ground :
Terminal 4 and 5 : The ground is okay
Terminal 16 : I got 12.43V , okay.
2. Check Voltage on High and Law CAN bus :
High : I got 2.54V
Law : I got 2.29V
3. Check Network Intergrity
On Pins 6 and 14, got 60.8 hohm.
Follow the instructions, i undertand that the CAN COMM is good. May be i'm wrong, you can tell me more.
After that i checked the Power and ground on ECM and got the result as follow :
1. ECM terminals 119 and 120 : No voltage ; but i got voltage on 121 terminal from battery. But as i understand from the maintenance book, 119 and 120 must have voltage.
2. ECM terminals 115 and 116 don't have ground, i'm not certain to test them well is their any method to test that?
I also red that the ECM Realay is grounded by the terminal 111 (white and green wire) from the ECM, is that right? So if this terminal don't have ground, the ECM won't received power on terminal 119 and 120. Your thoughts.
I'm sure that the problem is neither the ECM nor the IPDM as i Checked ECM and IPDM E/R internal circuit and got right values as per the maintenance book.
Your advices please.
I haven't reviewed all your measurements against wiring diagrams to confirm everything looks correct but it doesn't sound like your bus is shorted. I don't see any mention of you trying to connect to the various modules and read any codes. The behavior you're describing sounds like fail-safe mode when the ECM cannot communicate on the CAN bus. It sounds like your measurements don't point to anything obviously shorted which would mean your ECM should be able to communicate on the CAN bus. At some point you're going to have to confirm if it can communicate by trying to communicate with it.
One video I watched that pointed out that specific fail-safe fan operation noted that there are quite a few modules on the CAN bus and any of them have the ability to short it out and prevent everybody from talking on it. One method to figure out where the fault lies is to remove one module at a time from the bus until communication is restored. In that particular case it was the HVAC controller where the CAN bus was shorted. But if your bus is not shorted, your troubleshooting may need to take a different approach.
Have you downloaded the FSM from the NICOclub site? It will have a chapter called starting system that will include a step by step debug guide that will probably be more efficient at debugging your no start problem.
One video I watched that pointed out that specific fail-safe fan operation noted that there are quite a few modules on the CAN bus and any of them have the ability to short it out and prevent everybody from talking on it. One method to figure out where the fault lies is to remove one module at a time from the bus until communication is restored. In that particular case it was the HVAC controller where the CAN bus was shorted. But if your bus is not shorted, your troubleshooting may need to take a different approach.
Have you downloaded the FSM from the NICOclub site? It will have a chapter called starting system that will include a step by step debug guide that will probably be more efficient at debugging your no start problem.
- The ECM relay is not working properly, there is a lack of ground on this realais[sic].
- The injectors do not have a ground. On their connector I have the positive current but not the ground.
- I made the test on the connectors of the ECM to see if there is the ground, but no ground.
All these symptoms scream that there's something wrong with the ECM ground. If there's no ECM ground then there's no power to the ECM. No power to the ECM, no communication to the IPDM (cooling fans run constantly w/ ignition on). You need to figure out what's going on with the ECM ground (i.e. loose connection, broken wire, something wrong internally with the ECM, etc.)After that i checked the Power and ground on ECM and got the result as follow :
1. ECM terminals 119 and 120 : No voltage ; but i got voltage on 121 terminal from battery. But as i understand from the maintenance book, 119 and 120 must have voltage.
2. ECM terminals 115 and 116 don't have ground, i'm not certain to test them well is their any method to test that?
BTW, you said you have a 2.5L engine? Is it diesel?
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