NO.34 LIMITED i-stop FUNCTION OPERATION TIME [SKYACTIV-G 2.0]

id0103e6333900

34

LIMITED i-stop FUNCTION OPERATION TIME

DESCRIPTION

•  Frequency of which i-stop function operates is low.

•  Frequent occurrence of engine restarting other than for driving vehicle from stop.

POSSIBLE CAUSE

Battery voltage low during i-stop function operation

•  Battery deterioration

•  Insufficient battery recharge while engine is running

―  Low recharge effect

•  Generator malfunction (part, system, control malfunction)

•  Large amount of vehicle power consumption

•  High electrical load from aftermarket electrical accessories

False detection of engine starting conditions

•  False detection of battery voltage

•  False detection of A/C operation conditions

―  Malfunction of driver-side air mix actuator position sensor (false detection of MAX HOT, MAX COLD position)

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

―  Short or open circuit in wiring harness between heater core temperature sensor terminal B and climate control unit terminal 1O

―  Climate control unit malfunction

•  False detection of rear defroster operation signal

―  Climate control unit malfunction (panel switch malfunction)

•  False detection of low power brake unit load

―  Power brake unit vacuum sensor malfunction

―  Short or open circuit in wiring harness between the following terminals:

•  Power brake unit vacuum sensor terminal C—PCM terminal 2BG

•  Power brake unit vacuum sensor terminal B—PCM terminal 2Q

•  Power brake unit vacuum sensor terminal A—PCM terminal 2AH

―  Power brake unit malfunction (air tightness malfunction)

―  Malfunction in vacuum hose to power brake unit (damage, bad check valve)

•  False detection of depressed brake pedal

―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction

•  False detection of i-stop system non-operation condition (operation cancellation not detected)

―  i-stop OFF switch malfunction

―  Short to ground in wiring harness between i-stop OFF switch terminal I and instrument cluster terminal 1E

False recognition of driver performing engine start operation

•  False detection of shifting

―  Transaxle range sensor malfunction

―  M range switch malfunction

―  Short to ground in wiring harness between selector lever component terminal A and instrument cluster terminal 1K

•  False detection of released brake pedal

―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction

•  False recognition of depressed accelerator pedal

―  APP sensor malfunction

•  False detection of steering wheel operation

―  Steering angle sensor initialization malfunction

―  Steering angle sensor malfunction

―  Short or open circuit in wiring harness between steering angle sensor and BCM terminal 2D, 2E, 2F, 2G, 2H or 2I

Note

•  To ensure electric AT oil pump reliability, restart the engine regardless of the vehicle condition after 120 s have elapsed since the i-stop function operated.

34	LIMITED i-stop FUNCTION OPERATION TIME
DESCRIPTION	• Frequency of which i-stop function operates is low. • Frequent occurrence of engine restarting other than for driving vehicle from stop.
POSSIBLE CAUSE	Battery voltage low during i-stop function operation • Battery deterioration • Insufficient battery recharge while engine is running ― Low recharge effect • Generator malfunction (part, system, control malfunction) • Large amount of vehicle power consumption • High electrical load from aftermarket electrical accessories False detection of engine starting conditions • False detection of battery voltage • False detection of A/C operation conditions ― Malfunction of driver-side air mix actuator position sensor (false detection of MAX HOT, MAX COLD position) ― Heater core temperature sensor (heater airflow temperature sensor) malfunction ― Short or open circuit in wiring harness between heater core temperature sensor terminal B and climate control unit terminal 1O ― Climate control unit malfunction • False detection of rear defroster operation signal ― Climate control unit malfunction (panel switch malfunction) • False detection of low power brake unit load ― Power brake unit vacuum sensor malfunction ― Short or open circuit in wiring harness between the following terminals: • Power brake unit vacuum sensor terminal C—PCM terminal 2BG • Power brake unit vacuum sensor terminal B—PCM terminal 2Q • Power brake unit vacuum sensor terminal A—PCM terminal 2AH ― Power brake unit malfunction (air tightness malfunction) ― Malfunction in vacuum hose to power brake unit (damage, bad check valve) • False detection of depressed brake pedal ― Brake fluid pressure sensor (built-into DSC HU/CM) malfunction • False detection of i-stop system non-operation condition (operation cancellation not detected) ― i-stop OFF switch malfunction ― Short to ground in wiring harness between i-stop OFF switch terminal I and instrument cluster terminal 1E False recognition of driver performing engine start operation • False detection of shifting ― Transaxle range sensor malfunction ― M range switch malfunction ― Short to ground in wiring harness between selector lever component terminal A and instrument cluster terminal 1K • False detection of released brake pedal ― Brake fluid pressure sensor (built-into DSC HU/CM) malfunction • False recognition of depressed accelerator pedal ― APP sensor malfunction • False detection of steering wheel operation ― Steering angle sensor initialization malfunction ― Steering angle sensor malfunction ― Short or open circuit in wiring harness between steering angle sensor and BCM terminal 2D, 2E, 2F, 2G, 2H or 2I Note • To ensure electric AT oil pump reliability, restart the engine regardless of the vehicle condition after 120 s have elapsed since the i-stop function operated.

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT EFFECT OF NON-GENUINE ELECTRICAL ACCESSORY FOR CAUSE OF MALFUNCTION • Remove any non-genuine electrical accessory. • Verify the malfunction symptom. • Is the frequency of the engine restarting from the i-stop off condition the same as that of another vehicle of the same model?	Yes	The system is normal. • Explain to the customer that the frequency of the engine restarting increases due to the effect of the non-genuine electrical accessory installed.
1		No	Go to the next step.
2	VERIFY DTC • Retrieve the PCM, TCM, BCM, DSC HU/CM, instrument cluster and climate control unit DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC INSPECTION [FW6A-EL].) (See DTC INSPECTION [BCM].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) (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 ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [FW6A-EL].) (See DTC TABLE [BCM].) (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) (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 i-stop OFF SWITCH SIGNAL OR OTHER • Verify the condition of the i-stop warning light (amber) when the engine restarts. • Does the i-stop warning light (amber) illuminate?	Yes	Go to Step 5.
3		No	Go to the next step.
4*	INSPECT i-stop OFF SWITCH • Inspect the i-stop OFF switch. (See i-stop OFF SWITCH INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Replace the i-stop OFF switch. (See i-stop OFF SWITCH REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
4*		No	Repair or replace the wiring harness between i-stop OFF switch terminal I and instrument cluster terminal 1E for a possible short to ground.
5	VERIFY IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR INITIALIZATION NOT PERFORMED • Perform the initialization of the steering angle sensor. (See STEERING ANGLE SENSOR INITIALIZATION PROCEDURE.) • Has the malfunction symptom been eliminated?	Yes	Malfunction caused by the steering angle sensor initialization malfunction. • Symptom troubleshooting is completed.
5		No	Go to the next step.
6	DETERMINE IF MALFUNCTION CAUSE IS APP SENSOR SIGNAL OR OTHER • Switch the ignition to ON. • Access the following PCM PIDs using the M-MDS when the accelerator pedal is not depressed: (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) ― APP1 ― APP2 • Are the PID values normal? (See PCM INSPECTION [SKYACTIV-G 2.0].)	Yes	Go to the next step.
6		No	Replace the accelerator pedal. (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
7*	DETERMINE IF MALFUNCTION CAUSE IS TRANSAXLE RANGE SENSOR SIGNAL OR OTHER • Switch the ignition to ON. • Access the TCM PID TR using the M-MDS. (See ON-BOARD DIAGNOSTIC SYSTEM PID/DATA MONITOR INSPECTION [FW6A-EL].) • Is the TR PID value changing normally according to selector lever position?	Yes	Go to Step 9.
7*		No	Go to the next step.
8	INSPECT M POSITION SWITCH • Inspect the M position switch. (See M POSITION SWITCH INSPECTION [FW6A-EL].) • Is there any malfunction?	Yes	Replace the selector lever component. (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)
8		No	Inspect for short to ground between selector lever component terminal A and instrument cluster terminal 1K. • If there is any malfunction: ― Repair or replace the wiring harness for a possible short to ground. • If there is no malfunction: ― Replace the control valve body. (See CONTROL VALVE BODY REMOVAL/INSTALLATION [FW6A-EL].)
9	DETERMINE IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR SIGNAL OR OTHER • Start the engine and let it idle. • Access the EHPAS control module PID STEER_RATE using the M-MDS. (See ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS) ON-BOARD DIAGNOSIS.) • Is the PID value normal?	Yes	Go to Step 11.
9		No	Go to the next step.
10	INSPECT STEERING ANGLE SENSOR • Inspect the steering angle sensor. (See STEERING ANGLE SENSOR INSPECTION.) • Is there any malfunction?	Yes	Replace the steering angle sensor. (See STEERING ANGLE SENSOR REMOVAL/INSTALLATION.)
10		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Steering angle sensor terminal A—BCM terminal 2E • Steering angle sensor terminal B—BCM terminal 2H • Steering angle sensor terminal C—BCM terminal 2I • Steering angle sensor terminal D—BCM terminal 2F • Steering angle sensor terminal E—BCM terminal 2D • Steering angle sensor terminal F—BCM terminal 2G ― If there is any malfunction: • Repair or replace the suspected wiring harness.
11	DETERMINE IF MALFUNCTION CAUSE IS POWER BRAKE UNIT VACUUM SENSOR SIGNAL OR OTHER • Put the vehicle in an i-stop condition (engine stopped). • Access the PCM PID BBP using the M-MDS with the brake pedal depressed and the engine stopped. (See ON-BOARD DIAGNOSTIC TEST [SKYACTIV-G 2.0].) • Does the BBP PID value remain less than −43 kPa {−0.44 kgf/cm², −6.2 psi}?	Yes	Go to Step 14.
11		No	Go to the next step.
12	INSPECT POWER BRAKE UNIT VACUUM SENSOR FOR AIR TIGHTNESS MALFUNCTION • Perform the vacuum function inspection for the power brake unit and the vacuum loss inspection. (See POWER BRAKE UNIT INSPECTION.) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
12		No	Go to the next step.
13	INSPECT POWER BRAKE UNIT VACUUM SENSOR • Inspect the power brake unit vacuum sensor. (See POWER BRAKE UNIT INSPECTION.) • Is there any malfunction?	Yes	Replace the power brake unit vacuum sensor. (See POWER BRAKE UNIT REMOVAL/INSTALLATION (R.H.D.) [SKYACTIV-G 2.0].)
13		No	Inspect the wiring harness between the following terminals for a short or open circuit: • Power brake unit vacuum sensor terminal C—PCM terminal 2BG • Power brake unit vacuum sensor terminal B—PCM terminal 2Q • Power brake unit vacuum sensor terminal A—PCM terminal 2AH ― If there is any malfunction: • Repair or replace the suspected wiring harness.
14	DETERMINE IF MALFUNCTION CAUSE IS BRAKE FLUID PRESSURE SENSOR SIGNAL OR OTHER • Put the vehicle in an i-stop condition (engine stopped). • Monitor the PCM PID BFP using the M-MDS while the brake is depressed and held with the i-stop function operating. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].) • Does the monitoring value change?	Yes	Brake fluid pressure sensor malfunction. • Replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION.)
14		No	Go to the next step.
15	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 17.
15		No	Go to the next step.
16*	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].)
16*		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.
17	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	Go to Step 20.
17		No	Go to the next step.
18	INSPECT HEATER CORE TEMPERATURE SENSOR INSTALLATION • Verify the heater core temperature sensor installation condition. • Is the heater core temperature sensor installation condition normal?	Yes	Go to the next step.
18		No	Repair the heater core temperature sensor installation position. (See HEATER CORE TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
19	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].)
19		No	Repair or replace the wiring harness between heater core temperature sensor terminal B and PCM terminal 1O for a possible short or open circuit.
20	VERIFY BATTERY CONDITION • Inspect the battery. (See BATTERY INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Go to the next step.
20		No	Go to Step 22.
21	DETERMINE IF MALFUNCTION CAUSE IS BATTERY OR GENERATOR • Recharge the battery. (See BATTERY RECHARGING [SKYACTIV-G 2.0].) • Inspect the battery again. (See BATTERY INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Replace the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
21		No	Go to the next step.
22	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [SKYACTIV-G 2.0].) • Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results.
22		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
23	INSPECT THE CLIMATE CONTROL UNIT • Inspect the climate control unit. (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is there any malfunction?	Yes	Replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
23		No	Go to the next step.
24	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].)