LIMITED i-stop FUNCTION OPERATION TIME [SKYACTIV-D]

id1103sc002400

Troubleshooting item

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.
•  DTCs are stored in the following modules.
―  PCM
―  TCM (ATX)
―  DSC HU/CM
―  Dash-electrical supply unit
―  Body control module (BCM)
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 power brake unit load
―  Power brake unit vacuum sensor malfunction
―  Short or open circuit in power brake unit vacuum sensor power supply circuit, signal circuit, and ground circuit
―  Power brake unit malfunction (air tightness malfunction)
―  Malfunction in vacuum hose to power brake unit (damage, bad check valve)
•  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
False recognition of driver performing engine start operation
•  False detection of released brake pedal
―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction
•  False detection of steering wheel operation
―  Steering angle sensor initialization malfunction
―  EPS control module malfunction
―  Steering angle sensor malfunction

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
•  Perform the DTC inspection for the following modules.
―  PCM
―  TCM (ATX)
―  DSC HU/CM
―  Dash-electrical supply unit
―  Body control module (BCM)
•  Are any DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [PCM (SKYACTIV-D)].)
(See DTC TABLE [DSC HU/CM (E)].)
(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT (E)].)
(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No
Go to the next step.
3
INSPECT BATTERY FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See BATTERY RECHARGING [(E)].)
(See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
4
INSPECT GENERATOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See GENERATOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
5
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.
6
INSPECT STEERING ANGLE SENSOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)
(See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].)
7
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Perform the following procedure:
1.  Switch the ignition off, and after 2 min or more have elapsed, switch the ignition ON.
2.  Start the engine and drive the vehicle 10 m {32 ft 10 in} or more in a straight line at a speed of 10 km/h {6.2 mph} or more.
3.  Stop the vehicle with the wheels in the straight-ahead position.
4.  Access the EPS control module PID STR_ANG using the M-MDS.
•  If the STR_ANG value is normal, perform the repair completion verification 1. (Because the steering angle (estimated absolute angle) has returned to normal)
•  If the STR_ANG value is not normal, replace the EPS control module, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION [(E)].)
8
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 BRK_BSTR_PRES_ACT using the M-MDS with the brake pedal depressed and the engine stopped.
•  Does the BRK_BSTR_PRES_ACT PID value remain less than -45 kPa {-0.46 kgf/cm2, -6.5 psi}?
Yes
Go to Step 12.
No
Go to the next step.
9
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.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning location and perform the repair completion verification 1.
No
Go to the next step.
10
INSPECT POWER BRAKE UNIT VACUUM SENSOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [L.H.D. (E)].)
11
INSPECT POWER BRAKE UNIT VACUUM SENSOR POWER SUPPLY CIRCUIT, SIGNAL CIRCUIT, AND GROUND CIRCUIT FOR SHORT CIRCUIT AND OPEN CIRCUIT
•  Inspect the applicable circuit for a short circuit and open circuit.
•  Is the circuit normal?
Yes
Perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
12
INSPECT DRIVER-SIDE AIR MIX ACTUATOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Inspect the air mix door and linkage for sticking.
(See A/C UNIT DISASSEMBLY/ASSEMBLY [(E)].)
If there is no malfunction:
•  Go to the next step.
If there is any malfunction:
•  Repair or replace the malfunctioning location and perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See AIR MIX ACTUATOR REMOVAL [FULL-AUTO AIR CONDITIONER (E)].)
(See AIR MIX ACTUATOR INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
(See AIR MIX ACTUATOR REMOVAL [MANUAL AIR CONDITIONER (E)].)
(See AIR MIX ACTUATOR INSTALLATION [MANUAL AIR CONDITIONER (E)].)
13
DETERMINE IF MALFUNCTION CAUSE IS BRAKE FLUID PRESSURE SENSOR SIGNAL OR OTHER
•  Put the vehicle in an i-stop condition (engine stopped).
•  Monitor the DSC HU/CM PID BRK_FLD_PRES using the M-MDS while the brake is depressed and held with the i-stop function operating.
•  Does the monitoring value change?
Yes
ATX:
•  Perform the repair completion verification 1.
MTX:
•  Go to the next step.
No
Brake fluid pressure sensor malfunction.
•  Replace the DSC HU/CM, then perform the repair completion verification 1.
14*
DETERMINE IF MALFUNCTION CAUSE IS CLUTCH STROKE SENSOR SIGNAL OR OTHER
•  Switch the ignition ON (engine off).
•  Access the PCM PID CLTCH_PEDAL_POS using the M-MDS.
•  Does the CLTCH_PEDAL_POS PID value change according to the amount the clutch pedal is depressed?
Yes
Perform the repair completion verification 1.
No
Go to the next step.
15
INSPECT CLUTCH STROKE SENSOR FOR MALFUNCTION
•  Inspect the applicable part.
•  Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See CLUTCH MASTER CYLINDER REMOVAL/INSTALLATION [C66M-R, C66MX-R].)
16
INSPECT CLUTCH STROKE SENSOR SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
•  Inspect the applicable circuit for a short to power supply.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
Repair completion verification 1
VERIFY THAT VEHICLE IS REPAIRED
•  Install/connect the part removed/disconnected during the troubleshooting procedure.
•  Has the malfunction symptom been eliminated?
Yes
Complete the symptom troubleshooting. (Explain contents of repair to customer)
No
Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].)
•  If the CAN communication is normal, perform the diagnosis from Step 1.
―  If the malfunction recurs, go to the next step.
Repair completion verification 2
VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
•  Verify repair information and verify that there is a new calibration in the PCM.
•  Is there a new calibration in the PCM?
Yes
Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
•  If the malfunction recurs, replace the PCM.
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)