217: Cam And Crank Reluctor Diagnosis
About this episode
Two complex diagnostic cases involving cam and crankshaft reluctor sensors highlight the challenges of interpreting circuit codes. A 2016 Mazda CX-9 with a no-start issue revealed a damaged camshaft reluctor wheel missing most teeth, while a 2014 Infiniti QX-80 showed a faulty crankshaft reluctor on the flex plate after timing chain repairs. Both cases emphasize the importance of using oscilloscope waveforms to verify sensor signals and patterns rather than relying solely on code definitions. The episode also discusses how some vehicles run on cam sensors alone and the critical role of timing and sensor integrity in engine management.
Today on the show I share 2 case studies on vehicles I had back to back with very similar problems. First a 2016 Mazda CX-9 and then a 2014 Infiniti QX80. The Mazda is a no start and the Infiniti starts, but with several issues.
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Infiniti QX80
"But either way, interesting enough, even if it was just one. So the two vehicles that we're going to talk about, one is the 2016 Mazda CX-9, and the other one is the 2014 Infiniti QX-80. So I'll do it in chronological order."
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