NO.5 i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS [SKYACTIV-D 2.2]

id1103a2001000

5

i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS
DESCRIPTION
•  i-stop function operates even though system is turned off by pressing i-stop OFF switch.
•  i-stop function operates even though vehicle conditions are for non-operation.
•  i-stop function operates frequently while parking vehicle.
POSSIBLE CAUSE
i-stop warning light (amber) false illumination
•  i-stop warning light (amber) illumination circuit malfunction in instrument cluster
•  CAN communication line between instrument cluster and PCM malfunction
False detection of i-stop function operation conditions
•  False detection of brake pedal depressed
―  Brake switch No.1 malfunction
―  Short to power supply in wiring harness between brake switch terminal D and PCM terminal 2AA
―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction
•  False detection of ATF temperature within operable range (20 to 120 °C {68 to 248 °F}) (ATX)
―  TFT sensor malfunction
•  False detection of external vehicle temperature within operable range (−10 to 50 °C {14 to 122 °F})
―  Ambient temperature sensor malfunction (sensor specific malfunction)
―  Short or open circuit in wiring harness between ambient temperature sensor terminal A and PCM terminal 2AX
―  Open circuit in wiring harness between ambient temperature sensor terminal B and PCM terminal 2AY
•  Climate control unit falsely detects that internal vehicle temperature is within operation range. (with full-auto air conditioner)
―  Cabin temperature sensor malfunction (sensor specific or motor malfunction)
―  Short or open circuit in wiring harness between cabin temperature sensor terminal A and climate control unit terminal 1H
―  Open circuit in wiring harness between cabin temperature sensor terminal B and climate control unit terminal 1J
•  Falsely detects that climate control unit detects that driver-side air mix door is not in MAX HOT or MAX COLD position even though driver-side air mix door is in MAX HOT or MAX COLD position (with full-auto air conditioner)
―  Driver-side air mix actuator malfunction
―  Driver-side air mix actuator position sensor malfunction
―  Driver-side air mix door or linkage stuck
•  False detection of vehicle not being parked
―  False detection of steering wheel rotation speed
•  Steering angle sensor initialization malfunction
•  Steering angle sensor malfunction
•  Short or open circuit in wiring harness between steering angle sensor and start stop unit terminals 1U, 1T, 1W or 1S
•  Falsely detects that vehicle is under safety condition
―  False detection of closed bonnet
•  Bonnet latch switch malfunction (stuck closed)
•  Short to ground in wiring harness between bonnet latch switch terminal A and rear body control module (RBCM) terminal 3L
―  False detection of closed door, trunk (4SD)/liftgate (WGN)
•  Door latch switch malfunction
•  Trunk lid latch switch (4SD)
•  Liftgate latch switch malfunction (WGN)
•  Short to ground in wiring harness between door latch switch and rear body control module (RBCM)
•  Open circuit in wiring harness between trunk lid latch switch and rear body control module (RBCM) (4SD)
•  Open circuit in wiring harness between liftgate latch switch and rear body control module (RBCM) (WGN)
―  False detection of fastened driver seat belt
•  Driver-side buckle switch malfunction
•  Open circuit in wiring harness between driver-side buckle switch terminal 4A and SAS control module terminal 2U
―  False detection of inclination angle (false detection of 12 % or less)
•  Low-G (XY) sensor (built-into SAS control module) malfunction (In this case, the SAS control module records DTCs C0061:29 and C0062:29.)
•  Low-G (XY) sensor (built-into SAS control module) initialization malfunction
―  False detection of low power brake unit load
•  Power brake unit vacuum sensor malfunction
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal C and PCM terminal 2BB
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal B and PCM terminal 2BC
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal A and PCM terminal 2BD

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY DTC
•  Retrieve the PCM, TCM, front body control module (FBCM), rear body control module (RBCM), DSC HU/CM, SAS control module, 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 [SKYACTIV-D 2.2].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [GW6A-EL].)
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
(See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
(See DTC TABLE.)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
(See DTC TABLE [MANUAL AIR CONDITIONER].)
No
Go to the next step.
2*
DETERMINE IF MALFUNCTION CAUSE IS AMBIENT TEMPERATURE SENSOR SIGNAL OR OTHER
•  Switch the ignition ON (engine off or on).
•  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
Go to Step 4.
No
Go to the next step.
3
INSPECT AMBIENT TEMPERATURE SENSOR
•  Inspect the ambient temperature sensor.
•  Is there any malfunction?
Yes
Replace the ambient temperature sensor.
(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
No
Inspect the following:
•  Short or open circuit in wiring harness between ambient temperature sensor terminal A and PCM terminal 2AX
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between ambient temperature sensor terminal A and PCM terminal 2AX.
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.
•  Open circuit in wiring harness between ambient temperature sensor terminal B and PCM terminal 2AY
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between ambient temperature sensor terminal B and 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 an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
4*
DETERMINE IF MALFUNCTION CAUSE IS DOOR LATCH SWITCH AND TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (WGN) SIGNAL OR OTHER
•  Switch the ignition ON (engine off or on).
•  Access the following rear body control module (RBCM) PIDs using the M-MDS:
―  TRUNK
―  DOOR_D
―  DOOR_ALL
•  Are the PID values congruent with the opening and closing of the doors and trunk (4SD)/liftgate (WGN)?
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT DOOR LATCH SWITCH AND TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (WGN)
•  Inspect the PID-related switch in which the malfunction occurred in Step 4.
•  Is there any malfunction?
Yes
Replace the applicable switch.
(See TRUNK LID LATCH AND RELEASE ACTUATOR REMOVAL/INSTALLATION.)
(See LIFTGATE LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
No
Inspect the following in which the malfunction occurred in Step 4:
•  Short to ground in wiring harness between door latch switch and rear body control module (RBCM)
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between door latch switch and rear body control module (RBCM).
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.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Open circuit in wiring harness between trunk lid latch switch (4SD)/liftgate latch switch (WGN) and rear body control module (RBCM)
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between trunk lid latch switch (4SD)/liftgate latch switch (WGN) and rear body control module (RBCM).
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 an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
6*
DETERMINE IF MALFUNCTION CAUSE IS DRIVER-SIDE BUCKLE SWITCH SIGNAL OR OTHER
•  Switch the ignition ON (engine off or on).
•  Access the SAS control module PID SEAT_B_D using the M-MDS.
•  Is the SEAT_B_D PID value congruent with the seat belt condition?
Yes
With manual air conditioner:
•  Go to Step 10.
With full-auto air conditioner:
•  Go to Step 8.
No
Go to the next step.
7
INSPECT DRIVER-SIDE BUCKLE SWITCH
•  Inspect the driver-side buckle switch.
•  Is there any malfunction?
Yes
Replace the driver-side buckle switch.
(See FRONT BUCKLE REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between driver-side buckle switch terminal 4A and SAS control module terminal 2U for a possible open circuit.
8
DETERMINE IF MALFUNCTION CAUSE IS CABIN TEMPERATURE SENSOR SIGNAL OR OTHER
•  Access the climate control unit PID INC_TMP_SEN using the M-MDS.
•  Does the INC_TMP_SEN PID value indicate the actual cabin temperature of the vehicle?
Yes
Go to Step 10.
No
Go to the next step.
9
INSPECT CABIN TEMPERATURE SENSOR
•  Inspect the cabin temperature sensor.
•  Is there any malfunction?
Yes
Replace the cabin temperature sensor.
(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 1H
•  Cabin temperature sensor terminal B—Climate control unit terminal 1J
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 1H
•  Cabin temperature sensor terminal B—Climate control unit terminal 1J
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.
10*
DETERMINE IF MALFUNCTION CAUSE IS BONNET LATCH SWITCH SIGNAL OR OTHER
•  Switch the ignition ON (engine off or on).
•  Access the rear body control module (RBCM) PID HOOD_SW using the M-MDS.
•  Is the HOOD_SW PID value normal?
Yes
Go to Step 12.
No
Go to the next step.
11
INSPECT BONNET LATCH SWITCH
•  Inspect the bonnet latch switch.
•  Is there any malfunction?
Yes
Replace the bonnet latch switch.
(See BONNET LATCH AND RELEASE LEVER REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between bonnet latch switch terminal A and rear body control module (RBCM) terminal 3L for a possible short to ground.
12
DETERMINE IF MALFUNCTION IS CAUSED BY STEERING ANGLE (ESTIMATED ABSOLUTE ANGLE) SIGNAL ERROR
•  Start the engine and idle it.
•  Using the M-MDS, display EPS control module PID STR_ANG.
•  Are the monitoring values normal?
Yes
Go to Step 14.
No
Go to the next step.
13
INSPECT EPS CONTROL MODULE FOR MALFUNCTION
•  Inspect the EPS control module.
•  Is the EPS control module 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 or more in a straight line at a speed of 10 km/h or more.
3.  Stop the vehicle with the wheels in the straight-ahead position.
4.  Using the M-MDS, display EPS control module PID STR_ANG.
•  If the STR_ANG value is normal, go to Step 20.(Because the steering angle (estimated absolute angle) has returned to normal)
•  If the STR_ANG value is not normal, replace the EPS control module.
Go to Step 20.
No
Replace the EPS control module.
Go to Step 20.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
14
DETERMINE IF MALFUNCTION CAUSED BY BRAKE OPERATION SIGNAL ERROR
•  Switch the ignition ON (engine off or on).
•  Access the PCM PID BOO using the M-MDS.
•  Does the BOO PID value change according to the brake pedal operation?
Yes
Go to Step 16.
No
Go to the next step.
15
INSPECT BRAKE SWITCH
•  Inspect the brake switch.
•  Is there any malfunction?
Yes
Replace the brake switch.
(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)
(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
No
Open circuit in wiring harness between brake switch terminal D and PCM terminal 2AA.
•  Repair or replace the suspected wiring harness.
16
DETERMINE IF MALFUNCTION CAUSE IS POWER BRAKE UNIT VACUUM SENSOR SIGNAL OR OTHER
•  Turn off the i-stop system with i-stop OFF switch.
•  Start the engine and run it is idling.
•  Switch the ignition to off.
•  Switch the ignition ON (engine off).
•  Access the PCM PID BBP using the M-MDS while the brake pedal has been depressed several times.
•  Does the monitor value decrease every time the brake pedal is depressed?
Yes
With manual air conditioner:
•  Go to Step 20.
With full-auto air conditioner:
•  Go to Step 18.
No
Go to the next step.
17
INSPECT POWER BRAKE UNIT VACUUM SENSOR
•  Inspect the power brake unit vacuum sensor.
•  Is there any malfunction?
Yes
Replace the power brake unit vacuum sensor.
(See POWER BRAKE UNIT VACUUM SENSOR REMOVAL/INSTALLATION.)
No
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Power brake unit vacuum sensor terminal C—PCM terminal 2BB
•  Power brake unit vacuum sensor terminal B—PCM terminal 2BC
•  Power brake unit vacuum sensor terminal A—PCM terminal 2BD
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Power brake unit vacuum sensor terminal C—PCM terminal 2BB
•  Power brake unit vacuum sensor terminal B—PCM terminal 2BC
•  Power brake unit vacuum sensor terminal A—PCM terminal 2BD
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.
If there is no malfunction:
―  Replace the PCM.
18
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 2G (L.H.D.)
―  Climate control unit terminal 2E (R.H.D.)
•  Is the voltage normal?
Yes
Repeat the inspection from Step 1.
•  If the malfunction is not resolved, replace the PCM.
Go to Step 20.
No
Go to the next step.
19
INSPECT DRIVER-SIDE AIR MIX ACTUATOR
•  Inspect the driver-side air mix actuator.
•  Is there any malfunction?
Yes
Replace the driver-side air mix actuator.
(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.
20
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.