P0321 - Ignition/Distributor Engine Speed Input Circuit Range/Performance
- Ignition/Distributor engine speed sensor harness is open or shorted
- Ignition/Distributor engine speed sensor circuit poor electrical connection
- Faulty Crankshaft Position sensor
- Low battery charge
- Faulty Engine Control Module (ECM)
- Lack/Loss of Power
- The engine may be harder to start
- The engine may stumble or stall
Ignition failure sensor is used to check whether the spark ignition is occurred correctly or not and also used to tachometer drive. The sensor monitors the voltage difference between a resistance which is on the battery circuit for ignition coil. When the ignition coil works properly, the electric current through the resistance is detected as voltage drop. This is confirmed for every ignition event with the crankshaft sensor and the camshaft sensor. If ECM detects a malfunction, no ignition is possible, so the engine would not start. If there is no ignition signal for a predetermined cycle for one or two ignition coils, an ignition coil circuit failure exists.
P0321 MAZDA Crankshaft Sensor Circuit Malfunction
P0321 MERCEDES-BENZ Ignition/Distributor Engine Speed Input Circuit Range/Performance
P0321 VOLKSWAGEN Ignition Engine Speed Input Circuit Range/Performance
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