DTC Description

The Air conditioner Control Module sets DTC B1685 when Engine RPM signal has not been received through the CAN signal.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

•

Check CAN signal

1.

Poor connection in power supply circuit of A/C Control Module

2.

Open in A/C Control Module C- CAN communication line

3.

Short to ground in C-CAN communication line

4.

Short to battery in C-CAN communication line

5.

Faulty Engine RPM Sensor

6.

Faulty Engine system

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'

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