Ignition/Distributor Engine Speed Input Circuit No Signal
What does P0322 mean?
The P0322 code means the vehicle's onboard diagnostic system has detected: Ignition/Distributor Engine Speed Input Circuit No Signal. This is a critical severity code.
Common Symptoms
- Engine cranks but will not start
- Engine stalls and will not restart
- Tachometer reads zero during cranking
- Check Engine Light illuminated
- No spark from ignition system
Probable Causes (Ranked by Likelihood)
- Failed crankshaft position sensor Very High
- Broken or disconnected sensor wiring High
- Corroded sensor connector preventing signal High
- Sheared reluctor ring or damaged crankshaft trigger wheel Moderate
- PCM engine speed input circuit failure Low
Step-by-Step Diagnostic Procedure
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Verify no RPM signal on the scan tool during cranking -- confirms no signal is reaching the PCM
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Test the CKP sensor output with a multimeter set to AC volts during cranking -- should produce 0.5V or more
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Check for 5V reference voltage (Hall effect sensor) or proper ground at the sensor connector
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Inspect the sensor and reluctor ring for physical damage, metal debris, or contamination
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If the sensor and wiring test good, check for signal continuity from the sensor to the PCM connector
Frequently Asked Questions
Can I drive with code P0322?
No. With no engine speed signal, the PCM cannot control ignition or fuel injection. The engine will not start or will stall and not restart.
Can a CKP sensor fail from heat?
Yes. Crankshaft position sensors are exposed to engine heat and can fail when hot, then work again when cool. This is one of the most common intermittent failure patterns for CKP sensors.
Is this an easy DIY repair?
On most vehicles, replacing the CKP sensor is a moderate DIY task. The sensor is typically located near the front or rear of the crankshaft and held in by one or two bolts.