Your engine's crankshaft and camshaft timing are out of sync on Bank 1's intake side, like two dancers falling out of step. The ECU detected they're not opening and closing the valves at the right moment relative to piston position.
The ECM compares crankshaft position (CKP) sensor signals against camshaft position (CMP) sensor signals for Bank 1 Intake to verify valve timing correlation. It monitors the phase difference between the two sensors and flags a fault when the correlation exceeds acceptable limits, typically beyond 5° of crankshaft rotation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CMP-to-CKP Phase Correlation (Bank 1 Intake) | 0° to ±5° correlation within spec | >5° deviation or no valid correlation detected |
| Timing Signal Coherence | Continuous valid signals from both sensors | Intermittent or missing CMP/CKP signal correlation |