Meaning of Honda P1393
The P1393 code on Honda vehicles typically indicates a problem with intermittency or mismatch between the signals from the crankshaft position sensor (CKP) and the camshaft position sensor (CMP).
Possible Causes
- Faulty CKP sensor (crankshaft)
- Faulty CMP sensor (camshaft)
- Wiring issue or corroded/cut connectors
- Timing problem (misaligned timing belt)
- Reluctor fault (damaged gear wheel)
- PCM issue (rare)
Common Symptoms
- Engine hard to start (especially when cold)
- Misfires at idle or during acceleration
- Unstable idle
- Noticeable power loss
- Check engine light on
Recommended Diagnosis
- Check the CKP and CMP sensors
- Visual inspection (cracks, damage)
- Resistance measurement (compare with specific values)
- Signal analysis with an oscilloscope
- Inspect the wiring
- Check continuity between sensors and PCM
- Look for short circuits or corrosion
- Check the timing
- Verify alignment of timing marks
- Check the condition of the timing belt/chain
- Examine the gear wheels
- Check for missing or broken teeth on the reluctors
Repair
- Replace the faulty sensor (CKP or CMP)
- Repair wiring if necessary
- Reset the timing if there is a synchronization issue
- Clear the codes and perform a road test
Affected Honda Models
This issue can occur on various Honda models, including:
- Civic
- Accord
- CR-V
- Odyssey
- And other models with F, K, or J series engines
Important note: Some Honda models require a specific relearn procedure after replacing the sensors. A diagnostic tool may be necessary for certain operations.