NO.7 LIMITED i-stop FUNCTION OPERATION TIME [SKYACTIV-G 1.5, SKYACTIV-G 2.0]

id1103q7001200

7

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
Note
•  To ensure electric vehicle system reliability, restart the engine regardless of the vehicle condition after 120 s have elapsed since the i-stop function operated.
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 low vacuum sensor 2 load
―  Vacuum sensor 2 malfunction
―  Short or open circuit in wiring harness between the following terminals:
•  Vacuum sensor 2 terminal A—PCM terminal 2BG
•  Vacuum sensor 2 terminal C—PCM terminal 2Q
•  Vacuum sensor 2 terminal B—PCM terminal 2AH
―  Power brake unit malfunction (air tightness malfunction)
―  Malfunction in vacuum hose to power brake unit (damage, bad check valve)
False recognition of driver performing engine start operation
•  False detection of depressed clutch pedal (MT)
―  Clutch stroke sensor malfunction
―  Short to power supply in wiring harness between clutch stroke sensor terminal B and PCM terminal 2M
•  False detection of released brake pedal (AT)
―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction
•  False detection of steering wheel operation (AT)
―  Steering angle sensor initialization malfunction
―  EPS control module malfunction

•  When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions.If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

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.
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.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-G 1.5, SKYACTIV-G 2.0)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (SJ6A-EL)].)
(See DTC TABLE [BCM].)
(See DTC TABLE [DSC HU/CM].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
No
Go to the next step.
3
VERIFY BATTERY CONDITION
•  Inspect the battery.
•  Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 5.
4
DETERMINE IF MALFUNCTION CAUSE IS BATTERY OR GENERATOR
•  Recharge the battery.
•  Inspect the battery again.
•  Is there any malfunction?
Yes
Replace the battery.
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)
No
Go to the next step.
5
INSPECT GENERATOR
•  Inspect the generator.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
AT:
•  Go to the next step.
MT:
•  Go to Step 8.
6
DETERMINE IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR SIGNAL OR OTHER
•  Start the engine and let it idle.
•  Access the EPS control module PID STR_ANG using the M-MDS.
•  Is the PID value normal?
Yes
Go to Step 8.
No
Go to the next step.
7
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the EPS control module.
•  Is the EPS control module normal?
Yes
Perform the following procedures, then go to the next step.
1.  Switch the ignition off and maintain condition for approx. 3 s.
2.  Switch the ignition ON (engine off or on).
3.  Set the vehicle wheels straight-ahead, then drive the vehicle straight at 20 km/h {12 mph} or more for 5 s or more.
4.  Using the M-MDS, verify the STR_ANG_EST operation condition.
―  If an abnormal value is indicated after verifying the value of the STR_AB_EST ANG again, replace the steering column.
No
Replace the EPS control module, then go to Step 15.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
8
DETERMINE IF MALFUNCTION CAUSE IS VACUUM SENSOR 2 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.
•  Does the BBP PID value remain less than −47.8 kPa {−0.487 kgf/cm2, −6.93 psi}?
Yes
AT:
•  Go to Step 12.
MT:
•  Go to Step 13.
No
Go to the next step.
9
INSPECT POWER BRAKE UNIT FOR AIR TIGHTNESS MALFUNCTION
•  Perform the vacuum function inspection for the power brake unit and the vacuum loss inspection.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
10
INSPECT VACUUM SENSOR 2
•  Inspect the vacuum sensor 2.
•  Is there any malfunction?
Yes
Replace the vacuum sensor 2.
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
11
INSPECT VACUUM SENSOR 2 CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
•  Inspect for open or short circuit between the following terminals (wiring harness-side):
―  Vacuum sensor 2 terminal A—PCM terminal 2BG
―  Vacuum sensor 2 terminal C—PCM terminal 2Q
―  Vacuum sensor 2 terminal B—PCM terminal 2AH
•  Is there any malfunction?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Vacuum sensor 2 terminal A—PCM terminal 2BG
•  Vacuum sensor 2 terminal C—PCM terminal 2Q
•  Vacuum sensor 2 terminal B—PCM terminal 2AH
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 to ground 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 to ground or open circuit.
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)
12
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.
•  Does the monitoring value change?
Yes
Repeat the inspection from Step 1.
•  If the malfunction is not resolved, replace the PCM.
Go to Step 15.
No
Brake fluid pressure sensor malfunction.
•  Replace the DSC HU/CM.
13*
DETERMINE IF MALFUNCTION CAUSE IS CLUTCH STROKE SENSOR SIGNAL OR OTHER
•  Switch the ignition ON (engine off).
•  Access the PCM PID CPP using the M-MDS.
•  Does the CPP PID value change according to the amount the clutch pedal is depressed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction is not resolved, replace the PCM.
Go to Step 15.
No
Go to the next step.
14
INSPECT CLUTCH STROKE SENSOR
•  Inspect the clutch stroke sensor.
•  Is there any malfunction?
Yes
Replace the clutch master cylinder.
(See CLUTCH MASTER CYLINDER REMOVAL/INSTALLATION.)
No
Inspect for short to power supply between clutch stroke sensor terminal B and PCM terminal 2M.
•  If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between clutch stroke sensor terminal B and PCM terminal 2M.
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 to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
•  If there is no malfunction:
―  Replace the PCM.
15
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  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.