Each camshaft is equipped with a camshaft position (CMP) sensor that the engine control module (ECM) monitors. The CMP sensor is a hall effect switch that works in conjunction with a 4X reluctor wheel. The reluctor wheels are mounted to the camshaft position actuators that are mounted to the end of the camshafts. The ECM uses the CMP sensor signals in order to determine the position of the camshafts.
The ECM supplies 5 volts to the CMP sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The CMP sensors provide a signal to the ECM on the signal circuits. If the ECM detects extra or missing CMP sensor signal transitions within a certain number of crankshaft revolutions, this DTC sets.
新款CTS的汽油濾清器內置於油箱內，因此正常情況下無需進行保養，這樣可以節省將近400元的保養費用。相比之下老款車型汽油濾清器並未設置在油箱內，因此需要正常更換。另外空調濾芯原則上是春秋兩季進行更換，也就是一年兩次，為了查看方便，我們按照每隔一次保養更換一次為大家展示。
| 1) | Left Secondary Timing Chain Tensioner |
| (2) | Left Secondary Timing Chain Shoe |
| (3) | Left Secondary Timing Chain |
| (4) | Left Intake Camshaft Position Actuator Timing Mark |
| (5) | Left Exhaust Camshaft Position Actuator Timing Mark |
| (6) | Left Secondary Timing Chain Guide |
| (7) | Intermediate Position Actuator Timing Mark |
| (8) | Primary Timing Chain Guide |
| (9) | Crankshaft Position Actuator Pin Alignment Slot |
| (10) | Primary Timing Chain |
| (11) | Crankshaft Position Actuator Timing Mark |
| (12) | Primary Timing Chain Tensioner |
| (13) | Right Secondary Timing Chain Tensioner |
| (14) | Right Secondary Timing Chain Shoe |
| (15) | Right Exhaust Camshaft Position Actuator Timing Mark |
| (16) | Right Intake Camshaft Position Actuator Timing Mark |
| (17) | Right Secondary Timing Chain |
| (18) | Right Secondary Timing Chain Guide |
