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Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC U042F is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
Is applicable DTC detected?
Perform diagnosis of applicable. DTC Index
.
 
2.CHECK CAN COMMUNICATION LINE
Perform trouble diagnosis of CAN communication system. Refer to Trouble Diagnosis Flow Chart.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
3.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Is the inspection result normal?
Replace electric intake valve timing control module. Refer to ELECTRIC INTAKE VALVE TIMING CONTROL MODULE : Removal & Installation.
Repair or replace error-detected parts.