To help control the A/C Compressor, the A/C control unit receives the engine RPM from the ECM via CAN.
The Air conditioner Control Module sets DTC B1685 if Engine RPM signal has not been received through the CAN signal.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Check CAN signal | 1. Faulty Engine RPM 2. CAN communication |
Enable Conditions |
•
IG KEY ON | |
Threshold value |
•
No signal via CAN for 1.5 seconds or receiving Error value | |
Failsafe |
•
Substitued Engine RPM value as '0' |
