My service engine soon light is lit.

The codes pulled were P1320 followed by the P0325 Knock Sensor Code and then again the P1320. (Thank you Autozone!)

From previous threats, I've understood a P1320 represens an Ignition Signal Primary Circuit Fault and it may be a caused by:

- Harness or connectors (the ignition primary circuit is open or shorted.)
- Power transistor unit built into ignition coil
- Condenser
- Crankshaft Position Sensor (REF)
- Crankshaft Position Sensor (REF) circuit


***** Does anyone know what specific event(s) are considered a cause for error? For example, possibly a certain number of seconds at a certain voltage? *****

My coils pass the Haynes resistance test, but I'm not yet ready to rule them out. I'd like to troubleshoot this myself as the dealer's remedy is to replace all six coils and go from there.

'99 Nissan Maxima SE w/ 73,000 miles

Your knowledge and wisdom is much appreciated!

thanks,

- Dave

 

This error code is coming up right away as I am cranking the car to start. However, it starts up quickly and it runs fine. It may have lost a small amout of power.. but that could be just in my head.

Any thoughts?


Thanks,

- Dave

 

DTC 0201

Diagnostic Trouble Code 0201 indicates a problem with the ignition coil and power transistor.

The ignition signalfrom the Engine Control Module is sent to and amplified by the power transistor. The power transistor turns onand off the ignition coil primary circuit. This on-off operation induces the proper high voltage in the coilsecondary circuit. The malfunction is detected when the ignition signal in the primary circuit is not entered during engine cranking or running.

The items to check include
- Harness or connectors (the ignition primary circuit is open or shorted.)
- Power transistor unit built into ignition coil
- Condenser
- Crankshaft Position Sensor (REF)
- Crankshaft Position Sensor (REF) circuit

A misfire on any individual cylinder should set a code, and a problem with the CPS should also set a code.

I would have expected to see DTC 0201 along with one of the following DTCs.
0407 - Crankshaft Position Sensor (REF)
0608 - Cylinder 1 misfire
0607 - Cylinder 2 misfire
0606 - Cylinder 3 misfire
0605 - Cylinder 4 misfire
0604 - Cylinder 5 misfire
0603 - Cylinder 6 misfire

You didn't get one of these "companion" DTCs, and that is puzzling. Maybe one of them will show up in the next
few days.