VEHICLE SPEED DECREASES UNINTENTIONALLY [INTELLIGENT SPEED ASSISTANCE (ISA)]

id1503d8030900

Note

•  Due to environmental effects, the system behavior may differ from the driver’s intentions even though the vehicle has no malfunction. To perform symptom troubleshooting, an understanding of the applicable system from the new vehicle instruction is required. For details on the control conditions of the system, refer to the [INTELLIGENT SPEED ASSISTANCE (ISA)] operation in the service highlights/technical guide.

Outline

Description	•  The vehicle speed decreases unintentionally during intelligent speed assistance (ISA) operation.
Possible cause	•  Personalization feature not set •  Invalid SD card •  Forward sensing camera (FSC) optical axis deviation •  Forward sensing camera (FSC) malfunction •  Connectivity master unit (CMU) malfunction •  BCM malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ALL SYSTEM DTCs •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	Go to the next step.
2	VERIFY PERSONALIZATION FEATURES SETTING •  Verify the [notification and warning volume] using the personalization features. Note •  For personalization features setting using the center display, refer to Mazda Connect's [PERSONALIZATION FEATURES]. •  Was the speed limit sign threshold set to Automatic?	Yes	Complete the symptom troubleshooting. (Explain the system operation conditions to the customer.)
		No	Go to the next step.
3	VERIFY IF SD CARD IS VALID •  Perform diagnostic assist function “Storage Diagnostic Test” MAP Areas. (Refer to the [DIAGNOSTIC ASSIST FUNCTION] in the workshop manual) •  Has the traffic sign speed limit sync been turned off?	Yes	Go to the next step.
		No	Explain to the customer that the SD card is not valid.
Repair completion verification	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 [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction is not resolved, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)