DTC B1557 / B1561 / B1563

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
B1557: Wheel Speed Sensor and/or Its Circuit Malfunction HVAC control module receives invalid data of vehicle speed sensor signal from ECM.	•Wheel speed sensor •ESP^® control module •ECM •HVAC control module
B1561: Engine Coolant Temperature Sensor and/or Its Circuit Malfunction HVAC control module receives invalid data of ECT signal from ECM.	•ECT sensor •ECM •HVAC control module
B1563: A/C Refrigerant Pressure Sensor and/or Its Circuit Malfunction HVAC control module receives invalid data of A/C refrigerant pressure signal from ECM.	•A/C refrigerant pressure sensor •ECM •HVAC control module

DTC Confirmation Procedure

NOTE:

Check that the following condition is satisfied in this procedure.

•U0073, U0100, U0140 and/or U0155 are not detected

1)Start engine and operate A/C system.

2)B1557: Drive vehicle for about 1 minute.

DTC Troubleshooting

Step	Action	Yes	No
1	DTC check 1)Check DTC of ECM. •M16A model: •K14C model: •D16AA model: Is there any DTC(s) detected?	Go to applicable DTC diagnosis flow. •M16A model: •K14C model: •D16AA model:	Replace HVAC control module and recheck DTC.