DTC Description

P1634 is set when excessive current or "0"A is detected in heater relay control circuit for more than 1.0 sec. at heater relay operating condition. This code is due to 1)open or 2)short to battery or ground in heater relay control circuit or 3)component problem.

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

Voltage monitoring

PTC heater relay #1 control circuit

Heater relay component

Enable Conditions

IG KEY "ON" (monitoring only performed at relay operating condition)

Threshold Value

Short to battery

Diagnostic Time

1.0 sec.

Fail Safe

Fuel Cut

NO

EGR Off

NO

Fuel Limit

NO

Check Lamp

NO

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