Component Location
General Description

A/C relay which is controled by ECM supplies and cut electrical power to A/C compressor. ECM activates or deactivates A/C relay based on inputted signal such as A/C switch siganl and A/C pressure switch signal. As controlling A/C relay, ECM 1)turns OFF A/C compressor at rapid acceleration to retain suffiecient capacity for acceleration, 2)actively performs idle-up function to cope with the change of engine load which happens at A/C compressor operation.

DTC Description

P0647 is set when excessive current is detected in A/C relay control circuit for more than 1 sec.. This code is due to short to battery in A/C relay control circuit or internal short in relay component.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Voltage monitoring

● A/C relay circuit

● A/C relay component

Enable Conditions

● IG KEY "ON"

Threshold Value

● Short to battery

Diagnostic Time

● 1.0 sec.

Fail Safe

Fuel Cut

NO

EGR Off

NO

Fuel Limit

NO

Check Lamp

OFF

Schematic Diagram
note
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