2008 Nissan 370Z - No Start - No Stored Fault Codes - See How to Diagnose a camshaft timing fault

Описание: See how to diagnose a No Start Condition on 2008 Nissan 350Z. The vehicle does not start, the engine does crank (turn over) and there are no fault codes stored. If the camshaft sensor (CMP) on bank 1 (right side of engine when seated in the vehicle) is disconnected the engine will start.
With the bank 1 camshaft position sensor disconnected, Bernie confirms the engine does start. Right away the Fuel Control system shows an issue, with total fuel trim too high at 35%. With both banks reading the same, 35% positive fuel trim, that shows the problem is affecting both banks, and not likely a cam timing issue.
To get more info from the engine control system, Bernie connects an 8-Channel scope to the crankshaft sensor, the camshafts sensors, ignition coil #1 and the VCT control. Using the deep record feature, no trigger has to be set, all of the voltage data is recorded and easily reviewed. Zooming in, Bernie notices the camshaft sensor signals are not lined up correctly. Using the cursors and the measurement tool in the Elite 8-Channel scope, timing degree is measured in seconds, showing engine mechanical timing is off.
With the possibility of a stuck VCT, Bernie using the Elite 8-channel scope to activate the VCT phaser while monitoring the timing camshaft sensor waveforms to determine if the phaser is stuck. The camshaft phaser does activate and moves as expected.
Using pressure transducers, Bernie determines mechanical camshaft timing is good. But when he looks closer at the camshaft position sensor electrical signals, he finds they are off. This points to a faulty toothed tone ring on a camshaft phaser, it has shifted position. A new camshaft phaser fixed the issue.
Diagnostic equipment used:
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