Menu +
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

NO CYLINDER DEACTIVATION [SKYACTIV-G]

NO CYLINDER DEACTIVATION [SKYACTIV-G]

SM2334631

id0103s4891700

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

Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY IF CHARACTERISTIC LEARNING IS COMPLETED
• Verify if cylinder deactivation control has not been implemented directly after the following servicing.
― Directly after battery removal
― Directly after PCM configuration
• Does the non-implementation of the cylinder deactivation control apply to the above conditions?
Yes
Explain to the customer that cylinder deactivation control has not been implemented because the characteristic learning is not completed.
Go to repair completion verification.
No
Go to the next step.
2
VERIFY HOW CUSTOMER DRIVES VEHICLE
• Verify if cylinder deactivation control has not been implemented under the following situations.
Driving condition
― Vehicle speed: 5 km/h {3 mph} or less
Engine torque is large
― Accelerator pedal depression amount is large
― Accelerator pedal operation is too aggressive
― Large amount of vehicle load
Insufficient engine warm-up
― Right after engine start
Engine coolant or engine oil temperature is high
― Continuous, high-load driving
DSC operation
― During or directly after DSC operation
Cylinder deactivation continues for long periods
― Cylinder deactivation condition continues for 5 min or more
Note
• Cylinder deactivation control does not operate for approx. 30 s after cylinder deactivation control is continued for 5 min or more.
• Is there an applicable item for the situation in which cylinder deactivation control is not implemented?
Yes
Explain to the customer that the vehicle is normal and advise the customer how to drive the vehicle appropriately.
Go to repair completion verification.
No
Go to the next step.
3
VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-G (US))].)
No
Go to the next step.
4
DETERMINE IF MALFUNCTION CAUSED BY BATTERY BY VERIFYING BATTERY VOLTAGE
• Access the VPWR PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Verify the VPWR PID value.
• Is the VPWR PID value 11.5 V or less?
Yes
Go to the next step.
No
Go to Step 6.
5
INSPECT BATTERY FOR MALFUNCTION
• Inspect the applicable part. (See BATTERY INSPECTION [(US)].)
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(See BATTERY RECHARGING [(US)].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
6
VERIFY REPEATABILITY OF MALFUNCTION SYMPTOM
• Drive the vehicle 3 times under the following conditions.
― Deceleration continues for approx. 6 s with accelerator pedal and brake pedal released while driving at a speed of approx. 60 km/h {37 mph} or more.
• Can implementation of cylinder deactivation control be verified? (Verify using center display)
Yes
Go to the next step.
No
Replace the PCM and perform the repair completion verification.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
Yes
Complete the symptom troubleshooting. (Explain contents of repair to customer)
No
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(US)].)
• If the CAN communication is normal, perform the diagnosis from Step 1.
― If the malfunction recurs, go to the next step.
Repair completion verification 2
VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
• Verify repair information and verify that there is a new calibration in the PCM.
• Is there a new calibration in the PCM?
Yes
Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)