Engine Speed Sensor Circuit No Signal
The P0322 code indicates that the Engine Control Module (ECM) has detected no signal from the crankshaft position sensor or distributor pickup coil. This sensor is critical for determining engine speed and timing; without it, the ECM cannot properly control ignition timing or fuel injection. The issue often stems from a faulty sensor, damaged wiring, or a failed distributor module.
1. Most Common Causes
- Faulty crankshaft position sensor
- Damaged or corroded wiring/connectors
- Failed distributor pickup coil
- Malfunctioning ECM
2. Symptoms You Will Notice
- Engine cranks but won't start
- Engine stalls while driving
- Check Engine Light illuminated
- Rough idle or misfires
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0322 is present.
Step 2: Inspect the crankshaft position sensor and wiring for damage or corrosion.
Step 3: Test sensor resistance and AC voltage output while cranking.
Step 4: Check distributor pickup coil if applicable.
Step 5: Verify ECM power and ground circuits.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The engine may stall unexpectedly or fail to start, leading to a breakdown or accident.
How much does it cost to fix?▼
Typically $50-$150 for parts and labor, depending on the sensor location and vehicle make.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.