NO.35 INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop system) [SKYACTIV-G 2.0]

id0103e6334000

35

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

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

―  Driver-side air mix actuator malfunction

―  Driver-side air mix actuator position sensor malfunction

―  Driver-side air mix door link stuck

•  Airflow temperature cannot be determined correctly.

―  Heater core temperature sensor (heater airflow temperature sensor) malfunction

•  Cabin temperature of target vehicle cannot be calculated.

―  Cabin temperature sensor malfunction

―  Solar radiation sensor malfunction

―  Ambient temperature sensor malfunction

35	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 • Climate control unit falsely recognizes MAX HOT or MAX COLD of air mix door on driver-side ― Driver-side air mix actuator malfunction ― Driver-side air mix actuator position sensor malfunction ― Driver-side air mix door link stuck • Airflow temperature cannot be determined correctly. ― Heater core temperature sensor (heater airflow temperature sensor) malfunction • Cabin temperature of target vehicle cannot be calculated. ― Cabin temperature sensor malfunction ― Solar radiation sensor malfunction ― Ambient temperature sensor 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 climate control unit DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) (See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [SKYACTIV-G 2.0].) (See DTC TABLE [INSTRUMENT CLUSTER].) (See DTC TABLE [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 to ON. • Compare the ambient temperature sensor on the information display/multi information display with the actual ambient temperature. • Does the ambient temperature on the information display/multi information display 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 [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
4		No	Inspect the wiring harness between the following terminals: • Ambient temperature sensor terminal A—BCM 1X • Ambient temperature sensor terminal B—BCM 1H ― If there is any malfunction: • Repair or replace the suspected wiring harness.
5	DETERMINE IF MALFUNCTION CAUSE IS CABIN TEMPERATURE SENSOR SIGNAL OR OTHER • Access the climate control unit PID CABIN_TEMP using the M-MDS. (See PID/DATA MONITOR DISPLAY [FULL-AUTO AIR CONDITIONER].) • Does the CABIN_TEMP 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 [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the cabin temperature sensor. (See CABIN TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
6		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Cabin temperature sensor terminal D—Climate control unit terminal 2M • Cabin temperature sensor terminal B—Climate control unit terminal 2N • Cabin temperature sensor terminal A—Relay block terminal 1F (vehicles with advanced keyless entry and push button start system) • Cabin temperature sensor terminal A—Ignition switch terminal D (vehicles without advanced keyless entry and push button start system) • Cabin temperature sensor terminal C—Body ground ― If there is any malfunction: • Repair or replace the suspected wiring harness.
7	DETERMINE IF MALFUNCTION CAUSE IS SOLAR RADIATION SENSOR SIGNAL OR OTHER • Access the climate control unit PID SOLAR_SSR_R using the M-MDS. (See PID/DATA MONITOR DISPLAY [FULL-AUTO AIR CONDITIONER].) • Does the SOLAR_SSR_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 [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the solar radiation sensor. (See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
8		No	Inspect the wiring harness between the following terminals: • Solar radiation sensor terminal B—Climate control unit terminal 1F • Solar radiation sensor terminal C—Climate control unit terminal 1H ― If there is any malfunction: • Repair or replace the suspected wiring harness.
9	DETERMINE IF MALFUNCTION CAUSE IS DRIVER-SIDE AIR MIX ACTUATOR SIGNAL OR OTHER • Measure the voltage at the climate control unit terminal 1G (wiring harness-side) when the driver-side temperature setting is MAX HOT and MAX COLD. • Is the voltage normal? (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)	Yes	Go to Step 11.
9		No	Go to the next step.
10	INSPECT DRIVER-SIDE AIR MIX ACTUATOR • Inspect the driver-side air mix actuator. (See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the driver-side air mix actuator. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
10		No	Inspect the air mix actuator and linkage for sticking. (See A/C UNIT DISASSEMBLY/ASSEMBLY.) • If there is any malfunction: ― Repair or replace the malfunctioning part according to the inspection results.
11	DETERMINE IF MALFUNCTION CAUSE IS HEATER CORE TEMPERATURE SENSOR SIGNAL OR OTHER • Measure the voltage at the climate control unit terminal 1O (wiring harness-side) while the engine is stopped via i-stop control. • Do the elapsed time and voltage values change?	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).
11		No	Go to the next step.
12	INSPECT HEATER CORE TEMPERATURE SENSOR • Inspect the heater core temperature sensor. (See HEATER CORE TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the heater core temperature sensor. (See HEATER CORE TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
12		No	Repair or replace the wiring harness between heater core temperature sensor terminal B and PCM terminal 1O.
13	Verify the test results. • If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0].) • 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-G 2.0].)