Home Auto Repair 2004 Hyundai Sonata Tachometer is erratic and it seems to miss under...

2004 Hyundai Sonata Tachometer is erratic and it seems to miss under a light load while driving

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Download Tachometer is erratic and it seems to miss under a light load while driving. Has codes P0320. P0300, P0301, P0302, P0303, and P0304. Cleared the codes and P0320 returned. Tests/Procedures: Potential Causes: 1. Check for battery voltage at idle to the ignition failure sensor at terminal 4, Pink/Black wire. 2. Check for battery voltage from the ignition failure sensor to the coils at idle from terminal 3, Tan/Black wire. 3. Bypass the ignition failure sensor by jumping from terminal 4 to terminal 3 and test drive the vehicle to see if the miss still occurs. 4. Scope the signal at the ignition failure sensor at terminal 2, White wire that goes to the instrument cluster for the tach signal. Ignition Failure Sensor