Acura Fault Code P1392 – Complete Diagnostic
(Applicable to Acura/Honda models: TL, MDX, RSX, Integra, etc.)
1. Specific Meaning for Acura
Code P1392 on Acura indicates:
“Problem with correlation between CKP (crankshaft) and CMP (camshaft) sensors – Intermittent Circuit”
➡️ This code is often associated with:
- Temporary or permanent desynchronization between the two sensors
- An intermittent electrical issue (more common than with P1391)
- Early wear of the timing chain (on some engines)
2. Priority Causes for Acura
(Ranked in order of probability)
A. Electrical Problems (60% of cases)
- 📍 Loose or corroded CMP sensor connector (typical on 2000s Acura models)
- 📍 Rubbing of the wiring harness (especially on MDX 2001-2006)
- 📍 CMP sensor starting to weaken
B. Mechanical Problems (30% of cases)
- ⚙️ Excessive timing chain play (J-series V6 engines)
- ⚙️ Worn timing chain tensioner
- ⚙️ VTEC actuator problem
C. Other Causes (10%)
- 🔋 Poor power supply voltage (check alternator)
- 💻 ECU software issue (requires flash)
3. Step-by-Step Acura-Specific Diagnostic
Step 1 – Quick Check
- Disconnect/reconnect the CMP connector (often under the engine cover)
- Clean contacts with WD-40 Contact Cleaner
- Perform a road test
If the code returns →
Step 2 – Advanced Tests
| Test | Method | Correct Values |
|---|---|---|
| CMP Resistance | Multimeter on terminals 1-2 | 350-700 Ω (depending on model) |
| CMP Signal | Oscilloscope preferred | Regular square signal |
| Power Supply | Measure voltage on + wire | 12V with ignition on |
Step 3 – Mechanical Check
- Remove timing chain inspection plug (if present)
- Check chain tension with Honda HDS diagnostic tool
- Inspect hydraulic tensioner condition
4. Most Common Solutions
- On RSX/Integra Type-S: Replace CMP sensor gasket (frequent oil leak)
- On MDX/TL 3.2L/3.5L: Tighten ECU connectors + preventive tensioner replacement
- On VTEC models: Complete oil change + synthetic 5W-30 oil
5. Mistakes to Avoid
❌ Do not confuse with P0341 (CMP circuit problem)
❌ Do not ignore the code – can lead to serious misfire issues
❌ Avoid aftermarket sensors – prefer Denso or OEM
6. Most Affected Acura Models
- MDX 2001-2006 (3.5L V6) – Connector issues
- RSX 2002-2006 – Oil leak on CMP
- TL 1999-2003 (3.2L) – Timing chain tensioner wear
Average repair cost:
- $50-200 for simple electrical issue
- $400-800 for chain/tensioner replacement