NO.8 INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop system) [SKYACTIV-D 2.2]

id1103a2001300

8

INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop SYSTEM)

DESCRIPTION

•  A/C airflow temperature gradually increases or decreases while i-stop function is operating.

POSSIBLE CAUSE

A/C system malfunction

•  Front climate control unit falsely recognizes MAX HOT or MAX COLD of air mix door on driver-side

―  Driver-side front air mix actuator malfunction

―  Driver-side front air mix actuator position sensor malfunction

―  Driver-side air mix door link stuck

•  Cabin temperature of target vehicle cannot be calculated.

―  Cabin temperature sensor malfunction

―  Solar radiation sensor malfunction

―  Ambient temperature sensor malfunction

•  Refrigerant pressure sensor malfunction

•  A/C relay malfunction

•  Magnet clutch malfunction

8	INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop SYSTEM)
DESCRIPTION	• A/C airflow temperature gradually increases or decreases while i-stop function is operating.
POSSIBLE CAUSE	A/C system malfunction • Front climate control unit falsely recognizes MAX HOT or MAX COLD of air mix door on driver-side ― Driver-side front air mix actuator malfunction ― Driver-side front air mix actuator position sensor malfunction ― Driver-side air mix door link stuck • Cabin temperature of target vehicle cannot be calculated. ― Cabin temperature sensor malfunction ― Solar radiation sensor malfunction ― Ambient temperature sensor malfunction • Refrigerant pressure sensor malfunction • A/C relay malfunction • Magnet clutch malfunction

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	DETERMINE IF MALFUNCTION CAUSE IS i-stop SYSTEM OR A/C SYSTEM • Verify the malfunction symptom. • Does the malfunction occur only while the i-stop function is operating (engine stopped)?	Yes	Go to the next step.
1		No	Go to the applicable A/C malfunction diagnostic procedure. (See TROUBLESHOOTING INDEX [FULL-AUTO AIR CONDITIONER].)
2	VERIFY DTC • Retrieve the PCM, instrument cluster and front climate control unit DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].) (See DTC TABLE [INSTRUMENT CLUSTER].) (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
2		No	Go to the next step.
3	DETERMINE IF MALFUNCTION CAUSE IS AMBIENT TEMPERATURE SENSOR SIGNAL OR OTHER • Switch the ignition ON (engine off). • Compare the ambient temperature sensor on the LCD with the actual ambient temperature. • Does the ambient temperature on the LCD correspond to the actual ambient temperature?	Yes	Go to Step 5.
3		No	Go to the next step.
4	INSPECT AMBIENT TEMPERATURE SENSOR • Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION.) • Is there any malfunction?	Yes	Replace the ambient temperature sensor, then go to Step 15. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
4		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Ambient temperature sensor terminal A—PCM terminal 2AX • Ambient temperature sensor terminal B—PCM terminal 2AY If there is any malfunction: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Ambient temperature sensor terminal A—PCM terminal 2AX • Ambient temperature sensor terminal B—PCM terminal 2AY If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short or open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short or open circuit. Go to Step 15.
5	DETERMINE IF MALFUNCTION CAUSE IS CABIN TEMPERATURE SENSOR SIGNAL OR OTHER • Access the climate control unit PID INC_TMP_SEN using the M-MDS. (See PID/DATA MONITOR DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Does the INC_TMP_SEN PID value indicate the actual cabin temperature of the vehicle?	Yes	Go to Step 7.
5		No	Go to the next step.
6	INSPECT CABIN TEMPERATURE SENSOR • Inspect the cabin temperature sensor. (See CABIN TEMPERATURE SENSOR INSPECTION.) • Is there any malfunction?	Yes	Replace the cabin temperature sensor, then go to Step 15. (See CABIN TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
6		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Cabin temperature sensor terminal A—Front climate control unit terminal 1A • Cabin temperature sensor terminal B—Front climate control unit terminal 1Q If there is any malfunction: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Cabin temperature sensor terminal A—Front climate control unit terminal 1A • Cabin temperature sensor terminal B—Front climate control unit terminal 1Q If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short or open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short or open circuit. Go to Step 15.
7	DETERMINE IF MALFUNCTION CAUSE IS SOLAR RADIATION SENSOR SIGNAL OR OTHER • Access the climate control unit PID SLR_R_SEN_L and SLR_R_SEN_R using the M-MDS. (See PID/DATA MONITOR DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) • Does the SLR_R_SEN_L and SLR_R_SEN_R PID value display according to the solar radiation condition?	Yes	Go to Step 9.
7		No	Go to the next step.
8	INSPECT SOLAR RADIATION SENSOR • Inspect the solar radiation sensor. (See SOLAR RADIATION SENSOR INSPECTION.) • Is there any malfunction?	Yes	Replace the solar radiation sensor, then go to Step 15. (See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION.)
8		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Solar radiation sensor terminal B—Front climate control unit terminal 1F • Solar radiation sensor terminal C—Front climate control unit terminal 1H If there is any malfunction: ― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Solar radiation sensor terminal B—Front climate control unit terminal 1F • Solar radiation sensor terminal C—Front climate control unit terminal 1H If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short or open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short or open circuit. Go to Step 15.
9	DETERMINE IF MALFUNCTION CAUSE IS DRIVER-SIDE AIR MIX ACTUATOR SIGNAL OR OTHER • Measure the voltage at the following terminal (wiring harness-side) when the driver-side temperature setting is MAX HOT and MAX COLD. ― Front climate control unit terminal 2I • Is the voltage normal? (See FRONT CLIMATE CONTROL UNIT INSPECTION.)	Yes	Go to Step 11.
9		No	Go to the next step.
10	INSPECT DRIVER-SIDE AIR MIX ACTUATOR • Inspect the driver-side front air mix actuator. (See FRONT AIRFLOW MODE ACTUATOR INSPECTION.) • Is there any malfunction?	Yes	Replace the driver-side front air mix actuator, then go to Step 15. (See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
10		No	Inspect the front air mix actuator and linkage for sticking. (See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.) • If there is any malfunction: ― Repair or replace the malfunctioning part according to the inspection results. Go to Step 15.
11	INSPECT A/C RELAY • Switch the ignition off. • Remove the A/C relay. • Inspect the A/C relay. (See RELAY INSPECTION.) • Is the A/C relay normal?	Yes	Install the A/C relay, then go to the next step.
11		No	Replace the A/C relay, then go to Step 15.
12	DETERMINE IF MALFUNCTION CAUSE IS A/C RELAY CONTROL SIGNAL OR MAGNETIC CLUTCH • Start the engine and idle it. • Access the PCM PID ACCS using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) • Turn the ACCS PID to ON from OFF using the M-MDS simulation function. • Measure the voltage at the magnetic clutch terminal A (wiring harness-side). • Is the voltage 10.5 V or more?	Yes	Go to the next step.
12		No	Go to Step 14.
13	INSPECT IF MALFUNCTION CAUSE IS MAGNETIC CLUTCH OR MAGNETIC CLUTCH GROUND CIRCUIT • Switch the ignition off. • Disconnect the magnetic clutch connector. • Inspect for continuity between magnetic clutch terminal A (part-side) and body ground. • Is there continuity?	Yes	Inspect the magnetic clutch. (See MAGNETIC CLUTCH INSPECTION.) • If there is any malfunction: (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 2.2].) ― Replace the magnetic clutch, then go to Step 15.
13		No	Inspect the A/C compressor. (poor contact to ground) • If there is any malfunction: ― Repair or replace the malfunctioning part according to the inspection results, then go to Step 15. • If there is no malfunction: ― Replace the A/C compressor, then go to Step 15.
14	INSPECT REFRIGERANT PRESSURE SENSOR • Inspect the refrigerant pressure sensor. (See REFRIGERANT PRESSURE SENSOR INSPECTION.) • Is the refrigerant pressure sensor normal?	Yes	The system is normal. • Effect is due to a possible change in the vehicle environment while the engine is stopped (change in solar radiation). Go to the next step.
14		No	Replace the refrigerant pressure sensor, then go to the next step. (See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION.)
15	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-D 2.2].) • If a malfunction remains, inspect the related Service Information and perform the repair or diagnosis. ― If the vehicle is repaired, troubleshooting is completed. ― If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 2.2].)