General Description
With the ignition switch in the “ON” or “START” position, voltage is applied to the ignition coil. Each ignition coil consists of two coils, a primary and secondary coil. The coils are mounted on top of the spark plugs. To energize the primary ignition coils, the Powertrain Control Module (ECM) provides the ground to the primary circuit. The ECM uses the crankshaft position sensor and camshaft position sensor signals to time the energizing of the coil. When a primary ignition coil is energized and de-energized, the secondary coil produces a high voltage spike to the attached spark plug.
DTC Description
ECM monitors spark timing, if the actual spark timing differs from the commanded spark timing, ECM sets a P050B DTC. The Malfunction Indication Lamp (MIL) turns on when the malfunction lasts two consecutive driving cycles.
DTC Detecting Condition
Item | Detecting Condition | Possible cause |
DTC Strategy | Monitor the spark timing
| Faulty Ignition Coil Faulty ECM |
Enable Conditions | After engine soaking overnight
Vehicle is not rapidly accelerating or decelerating.
Battery Voltage between 11V and 16V
Engine is running.
NO DTC related to CKPS,Ignition coil, and Misfire
|
Threshold value | The actual spark timing > the commanded spark timing + 15° or < the commanded spark timing -15°
|
Diagnosis Time | Within 1 minute after cold-starting
|
MIL On Condition | 2 Drive Cycles
|