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Posted on Jan 02, 2017
SOURCE: 2001 kia optima starts but
P0320 - Ignition Failure Sensor Circuit Malfunction
It sounds to me like you might just have a bad ignition failure sensor. This is very common; with the engine running check for battery voltage to the ignition failure sensor on the Pink wire, less than 0.05 volts on the Black wire, and battery voltage from the ignition failure sensor on the Black/White wire. Check for battery voltage to the coils on the Black/White wire and verify the voltage is the same as the voltage on the Pink wire at the ignition failure sensor. With the engine running, scope the signal on the Yellow/Red wire from the ignition failure sensor (click over image for zoom).
Ignition Failure Sensor
Ignition Failure Sensor Wiring
I know this is a different engine, but it will look something like this...
This is the PART REPLACEMENT...
Here... got this from a fellow expert (click over image for zoom)...
Posted on Jul 19, 2011
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P0320 Ignition Engine Speed Input Circuit Malfunction-The ignition engine speed sensor input signal to PCM is continuously monitored. The test fails when the signal indicates that two successive erratic profile ignition pickup (PIP) pulses have occurred.
The DTC indicates that two successive erratic PIP pulses occurred
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