HVAC System - Manual

Schematic:

CIRCUIT DESCRIPTION
The left temp door motor is an electronic actuator stepper motor with a feedback potentiometer. The IPM determines the position of the door motor based on the voltage from the potentiometer. Whenever the IPM battery power is interrupted (or by using the scan tool) the IPM will recheck motor travel range.

CONDITIONS FOR RUNNING THE DTC
^ The IPM power must be interrupted.
^ Perform the Recalibrate all Motors command using the scan tool.

CONDITIONS FOR SETTING THE DTC
The left temp door motors actual total travel range (max - min) is less than or greater than the calibrated limits.

ACTION TAKEN WHEN THE DTC SETS
^ The IPM will continue to make use of whatever motor travel range is still available.
^ Each time the ignition switch is turned ON the IPM will recheck the motor travel range.

CONDITIONS FOR CLEARING THE DTC
The motor travel range error must be corrected.

DIAGNOSTIC AIDS
^ The range fault code can only be set following a check of the motor travel range. The motor travel range check can only be initiated by disrupting power to the IPM (disconnecting the battery) or with the scan tool.
^ The calibration limit is 152 to 220 counts (3.0-4.4 V). An actual range below this limit suggests an obstruction (something stuck in the door limiting travel). An actual range above this limit suggests an over travel condition (damaged or missing foam seals).
^ Refer to Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-8:

Steps 9-16:

The number(s) below refer to the step number(s) on the diagnostic table.
8. Tests for the proper operation of the motor in both directions.