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

•  The A/C airflow temperature is too high or low compared with the set temperature while the 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 (with full-auto air conditioner system)

―  Driver-side air mix actuator malfunction

―  Driver-side air mix actuator position sensor malfunction

―  Driver-side air mix door link stuck

•  Cabin temperature of target vehicle cannot be calculated. (with full-auto air conditioner system)

―  Cabin temperature sensor malfunction

―  Solar radiation sensor malfunction

―  Ambient temperature sensor malfunction

•  Refrigerant pressure sensor malfunction

•  A/C relay malfunction

8	INEFFECTIVE OPERATION OF A/C DURING ENGINE STOP (i-stop SYSTEM)
DESCRIPTION	• The A/C airflow temperature is too high or low compared with the set temperature while the 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 (with full-auto air conditioner system) ― Driver-side air mix actuator malfunction ― Driver-side air mix actuator position sensor malfunction ― Driver-side air mix door link stuck • Cabin temperature of target vehicle cannot be calculated. (with full-auto air conditioner system) ― Cabin temperature sensor malfunction ― Solar radiation sensor malfunction ― Ambient temperature sensor malfunction • Refrigerant pressure sensor malfunction • A/C relay 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.

No

Go to the applicable A/C malfunction diagnostic procedure.

(See TROUBLESHOOTING INDEX [FULL-AUTO AIR CONDITIONER].)

(See TROUBLESHOOTING INDEX [MANUAL AIR CONDITIONER].)

2

VERIFY DTC

•  Perform the DTC inspection for the following modules.
(See DTC INSPECTION.)

―  PCM

―  Instrument cluster

―  Climate control unit

•  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)].)

(See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL AIR CONDITIONER)].)

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

Vehicles with manual air conditioner:

•  Go to Step 11.

Vehicles with full-auto air conditioner:

•  Go to Step 5.

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].)

(See AMBIENT TEMPERATURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].)

•  Is there any malfunction?

Yes

Replace the ambient temperature sensor, then go to Step 15.

(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

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 INSPECTION.)

•  Does the INC_TMP_SEN PID value indicate the actual cabin temperature of the vehicle?

Yes

Go to Step 7.

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, then go to Step 15.

(See CABIN TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

No

Inspect the wiring harness between the following terminals for a short or open circuit:

•  Cabin temperature sensor terminal A—Climate control unit terminal 1A

•  Cabin temperature sensor terminal B—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—Climate control unit terminal 1A

•  Cabin temperature sensor terminal B—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 INSPECTION.)

•  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.

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, then go to Step 15.

(See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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.

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.

―  Climate control unit terminal 2K (L.H.D.)

―  Climate control unit terminal 2I (R.H.D.)

•  Is the voltage normal?
(See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)

Yes

Go to Step 11.

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, then go to Step 15.

(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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.

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.

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 sumulation item ACCS using the M-MDS.
(See SIMULATION INSPECTION.)

•  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.

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 [SKYACTIV-D 2.2].)

•  If there is any malfunction:

―  Replace the magnetic clutch, then go to Step 15.
(See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 2.2].)

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 [MANUAL AIR CONDITIONER].)

(See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

•  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).

No

Replace the refrigerant pressure sensor, then go to the next step.

(See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

(See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

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].)

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].) (See TROUBLESHOOTING INDEX [MANUAL AIR CONDITIONER].)
2	VERIFY DTC • Perform the DTC inspection for the following modules. (See DTC INSPECTION.) ― PCM ― Instrument cluster ― Climate control unit • 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)].) (See DTC TABLE [CLIMATE CONTROL UNIT (MANUAL 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	Vehicles with manual air conditioner: • Go to Step 11. Vehicles with full-auto air conditioner: • 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].) (See AMBIENT TEMPERATURE SENSOR INSPECTION [MANUAL AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the ambient temperature sensor, then go to Step 15. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].) (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
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 INSPECTION.) • 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 [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the cabin temperature sensor, then go to Step 15. (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 A—Climate control unit terminal 1A • Cabin temperature sensor terminal B—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—Climate control unit terminal 1A • Cabin temperature sensor terminal B—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 INSPECTION.) • 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 [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the solar radiation sensor, then go to Step 15. (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. 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. ― Climate control unit terminal 2K (L.H.D.) ― Climate control unit terminal 2I (R.H.D.) • 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, then go to Step 15. (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. 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 sumulation item ACCS using the M-MDS. (See SIMULATION INSPECTION.) • 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 [SKYACTIV-D 2.2].) • If there is any malfunction: ― Replace the magnetic clutch, then go to Step 15. (See MAGNETIC CLUTCH DISASSEMBLY/ASSEMBLY [SKYACTIV-D 2.2].)
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 [MANUAL AIR CONDITIONER].) (See REFRIGERANT PRESSURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • 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).
14		No	Replace the refrigerant pressure sensor, then go to the next step. (See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].) (See REFRIGERANT PRESSURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
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].)