Code No. U0164 A/C CAN timeout


caution
  • If diagnosis code No. U0164 is set, be sure to diagnose the CAN bus line.
  • Before replacing ECU, ensure that the communication circuit is normal.

DIAGNOSTIC FUNCTION



JUDGEMENT CRITERIA


Check Conditions
  • When all the following conditions are met.

  1. Power supply mode: ON
  2. ETACS-ECU system voltage is at 10 to 16 V.
Judgment Criterion
  • After the following condition is met, 2,500 ms or more have elapsed.

  1. CAN signal from the heater control unit or A/C-ECU cannot be received.

PROBABLE CAUSES



  • Malfunction of the CAN bus line
  • Malfunction of heater control unit or A/C-ECU
  • Malfunction of heater control unit or A/C-ECU power supply circuit
  • Malfunction of OSS-ECU

DIAGNOSIS PROCEDURE


1.
2.
3.