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Matt
Matt, Mechanical Engineer
Category: Nissan
Satisfied Customers: 20592
Experience:  BEng hons Mech engineering, in auto industry 22 years
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NISSAN qUASHQUAI WONT START

Customer Question

NISSAN qUASHQUAI WONT START
Submitted: 1 year ago.
Category: Nissan
Expert:  Matt replied 1 year ago.
Hello if the engine won't turn over / crank then first check it can turned over by hand so double checking for any mechanical issues If OK then check that the main battery cablesare on tight and the terminals are clean and bright. Do the same for the engine/ gearbox earth strap.Then follow the main positive lead back to the engine and down to the starter motor, and check the connection at this end as well. There should alsobe a small wire to the motor which should have 12V when you're turning the ignition switch to crank. If the 12V isn't there, check back along this wire for damage to the insulation or corroded connections This 12V feed comes directly from the ignition switch so this may be faulty and need replacing Check the resistance of the main positive lead that runs down to the motor as anything more than a few ohms and it should be replacedDon't forget to try a jump start from another car / battery as its possible the battery is poor, if you have a voltmeter a healthy battery should read 12.7+V also trysubstituting the battery for another as I've known a very flat battery to dragdown the system voltage too far even with jump cablesone other thing to consider is that the immobiliser is faulty and preventingthe starter from being enabled - however if the dash / ignition lights are onthen this usually means that its offIf this is all OK then its possible the car needs a new starter motor
Expert:  Matt replied 1 year ago.
now if it cranks / turns over then check that you're getting full power to the glow-plugs, they pull a lot of current so take carewhen checking but see if the relay is clicking when the ignition is turned onfirst and also check the fuse if this is OK check to see if the engine earthstrap is also OK.If the plugs haven't been changed in the last 20K then they may have to bereplaced.You can test the glow-plugs with a multimeter by measuring the resistance across the plug (between the power connection and the body) it should be around 4-8ohms if itstending to infinity / open circuit the plug is faulty or by using a clip on current clamp, either on the supplywire to glow plugs or onto engine earth, with glow plug light on you should see15-20amps for each glow plug fitted, 4 cylinders would be approximately 60-80amps.Also its worth checking that the electric pump that feeds the main fuel pump isworking correctly, it should run for a few seconds then switch off when youfirst turn the ignition on. If the connections to this are corroded or damagedthen the pump could stop at any time. Check that its relay switches in and outand the relay contacts are clean and bright – replace the relay if in any doubtand do the same for the fuse, ideally measure the voltage at the pump and check its getting 12VAlso if its not injecting at all then check the connections to the crankshaft sensor, unplug it and check for corroded contacts and broken wiring, and consider fitting a new sensor - do the same for the cam position sensorIf the EGR valve is stuck open then this too can effect starting so try disconnecting it to see if this helps or changes anything Could also be an injector leaking fuel back through the overspill pipe, so not getting enough fuel pressure to tell ECU to fire the injectors, this is trickier to find and you’ll need the garage to do a ‘run back’ test to identify which one is theissueLastly it’s also worth considering fitting a new fuel filter as if only slightly blocked this can lower fuel supply pressure and choke the main pump, the pump will be more sensitive to this when its cold as diesel thickens considerably with low temperatures.
Expert:  Matt replied 1 year ago.
Hello Pat

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