1. Specific Meaning of Acura P1393
The P1393 code on Acura vehicles indicates:
“Camshaft Position (CMP) Sensor Circuit Performance/Range Problem – Bank 1”
Differences from similar codes:
- P1391/P1392: CKP and CMP correlation issues
- P1393: Specific CMP circuit failure
2. Affected Acura Models
| Model | Engine | Years | Critical Mileage |
|---|---|---|---|
| TL | 3.2L V6 (J32A) | 1999-2003 | 120,000-180,000 km |
| MDX | 3.5L V6 (J35Y) | 2007-2013 | 100,000-160,000 km |
| RSX | 2.0L I4 (K20A) | 2002-2006 | 90,000-150,000 km |
| RDX | 2.3L Turbo (K23A) | 2007-2012 | 80,000-140,000 km |
3. Main Causes
A. Electrical Problems (75%)
- Faulty CMP sensor (ref. Acura 37550-RPY-013)
- Damaged wiring (especially near exhaust manifold)
- Oxidized connector (green terminal degradation)
- Power supply issue (voltage <4.5V or >5.5V)
B. Mechanical Problems (20%)
- Metal deposits on sensor target
- Excessive clearance in camshaft
- Timing issue after service
C. Other Causes (5%)
- PCM failure (rare but possible)
- Electromagnetic interference
- Contaminated engine oil
4. Diagnostic Procedure
Step 1 – Initial Checks
- Check oil level and quality
- Visually inspect CMP sensor and wiring
- Check associated codes (P0340, P0341, etc.)
Step 2 – Electrical Tests
| Test | Method | Normal Values |
|---|---|---|
| Power supply voltage | Multimeter (ignition ON) | 4.5-5.5V |
| CMP resistance | Multimeter (sensor disconnected) | 400-1000 ohms |
| Output signal | Oscilloscope (engine running) | Regular square signal |
Step 3 – Advanced Checks
- CMP data analysis with HDS scanner
- Mechanical timing verification
- Wiring continuity test to PCM
5. Specific Solutions by Engine
For J-Series (V6)
- CMP sensor replacement (revised version)
- CMP harness inspection (critical area: firewall passage)
- PCM connector cleaning
For K-Series (I4)
- CMP seal check (frequent oil leaks)
- VTC pulley control
- PCM reprogramming if necessary
6. Key Technical Data
- CMP supply voltage: 5V ±0.5V
- Preventive replacement interval: 150,000 km
- Sensor tightening torque: 10 Nm (K-series) / 12 Nm (J-series)
7. Repair Costs
| Service | Cost (USD) | Warranty |
|---|---|---|
| Sensor replacement | $120-$250 | 2 years |
| Wiring repair | $150-$400 | 1 year |
| Professional diagnosis | $80-$150 | – |
8. Common Mistakes
- Neglecting CMP seal inspection
- Using non-OEM sensors (failure rate >35%)
- Forgetting to check power supply voltage
9. Technical FAQ
Q: Can this code cause hard starting?
→ Yes, PCM may mismanage injection without valid CMP signal
Q: Can I reset the code without repair?
→ No, the code will return as long as the problem persists
Q: Difference between P1393 and P0341?
→ P1393 = performance problem, P0341 = circuit problem
10. Post-Repair Procedure
- Clear codes with HDS scanner
- Perform driving cycle:
- 10 min at constant speed (60-80 km/h)
- 3 complete stops/starts
- Verify code does not return
11. Prevention Tips
- Regular oil changes (every 10,000 km max)
- Annual CMP wiring inspection
- Use of premium synthetic oil
- Periodic connector cleaning
12. Conclusion
To permanently resolve P1393 on Acura:
- Complete diagnosis with HDS scanner
- Thorough electrical verification
- Replacement with Acura/Honda OEM parts
⚠️ Important: Recurring CMP problems on Acura often require thorough inspection of wiring and connectors. Consult a certified Acura technician for complex diagnostics.