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No Cylinder Deactivation: Notes

NO CYLINDER DEACTIVATION (VINs 7, L, M) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item No cylinder deactivation
Description
  • Cylinder deactivation control does not operate.
Possible cause
  • Cylinder deactivation control is in inhibit mode due to any of the following conditions

Due to customer's driving operation or vehicle conditions
  • Selector lever position is P, N or R position (ATX)
  • Shift lever position: Any neutral, reverse, or low speed gear (MTX)
  • Vehicle speed: 5 km/h {3 mph} or less
  • Engine speed: 1, 000 rpm or less, or 3, 600 rpm or more

Other
  • Characteristic learning (1) for cylinder deactivation system-related parts is not completed
  • Engine torque is larger than specified value
  • Insufficient engine warm-up
  • Engine coolant or engine oil temperature is high
  • During or directly after DSC operation
  • Cylinder deactivation control continues for long periods
  • Cylinder deactivation system-related part malfunction
  • Battery voltage is extremely low

(1) To perform cylinder deactivation control, the PCM performs the crankshaft installation tolerance learning and learns the individual differences (variations) of the sensor which occurs during the manufacturing of the engine oil pressure sensor relative to the cylinder deactivation control-related parts.
WARNING:
  • The crankshaft installation tolerance learning and the engine oil pressure sensor variation learning are performed at the following timing, however it could result in an accident. Explain to the customer that the vehicle is not to be driven to perform learning for the PCM intentionally.

Crankshaft installation tolerance learning
  • While deceleration continues for approx. 6 s with accelerator pedal released and brake pedal released while driving at a speed of approx. 60 km/h {37 mph} or more

Engine oil pressure sensor variation learning
  • During 11 s while vehicle is stopped after ignition switched OFF
NOTE:
  • The inhibit conditions relative to the driving condition directly before cylinder deactivation control is not implemented can be verified by using the M-MDS function.
  • This function indicates the [Other] conditions which frequency is high as a reason that cylinder deactivation control is inhibited for the driving operation and driving range available for cylinder deactivation.
System wiring diagram
  • Not applicable
Connector diagram
  • Not applicable
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