🔧 Crankshaft and Camshaft Position Sensor Issues
📌 Possible Causes
NOTE: This list is not exhaustive. Other causes may also be responsible for the problem.
🔴 Faulty crankshaft position sensor (CKP)
🔴 Faulty camshaft position sensor (CMP)
🔴 Crankshaft position sensor wiring open or short circuit
🔴 Poor electrical connection in crankshaft position sensor circuit
🔴 Camshaft position sensor wiring open or short circuit
🔴 Poor electrical connection in camshaft position sensor circuit
❓ What Does This Mean?
The camshaft position sensor (CMP) detects the camshaft position and identifies when piston number 1 is on its compression stroke. This signal is then sent to the powertrain control module (PCM) to synchronize:
✅ Sequential fuel injector firing
✅ Correct coil firing in coil-on-plug (COP) ignition systems
The crankshaft position sensor (CKP), on the other hand, is a magnetic sensor mounted on the engine block near an impulse wheel on the crankshaft. It is the primary sensor that provides the PCM with accurate information for ignition timing.
The PCM monitors both CKP and CMP sensors. If incorrect timing or erratic signals are detected, a diagnostic trouble code (DTC) will be generated and the check engine light may illuminate.
🔎 Possible Symptoms
⚠️ Check engine light on (or maintenance warning light)
⚠️ Loss of power
⚠️ Engine stalling
⚠️ Difficulty starting the engine
🛠️ How to Repair?
1️⃣ Refer to the “Possible Causes” section to identify components to check.
2️⃣ Visually inspect the wiring harness and associated connectors.
3️⃣ Look for the following:
🔍 Damaged components
🔍 Broken, bent, or corroded connector pins
🔍 Loose or improperly connected components
If a problem is identified, replace or repair the affected component.