NO.32 i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS [SKYACTIV-G 2.0]

id0103e6333700

32

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
False detection of i-stop function operation conditions
•  False detection of operating i-stop system
―  i-stop OFF switch malfunction (stuck off)
―  Open circuit in wiring harness between i-stop OFF switch terminal I and instrument cluster terminal 1E
―  Open circuit in wiring harness between i-stop OFF switch terminal G and body ground
•  False detection of stopped vehicle
―  Vehicle speed signal malfunction
•  ABS wheel-speed sensor malfunction
•  Falsely detects that driver intends to stop vehicle
―  False detection of depressed accelerator pedal
•  APP sensor malfunction
•  False detection of selector lever position
―  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 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 BCM terminal 1X
―  Open circuit in wiring harness between ambient temperature sensor terminal B and BCM terminal 1H
•  Climate control unit falsely detects that internal vehicle temperature is within operation range.
―  Cabin temperature sensor malfunction (sensor specific or motor malfunction)
―  Short or open circuit in wiring harness between cabin temperature sensor terminal D and climate control unit terminal 2M
―  Open circuit in wiring harness between cabin temperature sensor terminal B and climate control unit terminal 2N
―  Open circuit in wiring harness between cabin temperature sensor terminal A and relay block terminal 1F (vehicles with advanced keyless entry and push button start system)
―  Open circuit in wiring harness between cabin temperature sensor terminal A and ignition switch terminal D (vehicles without advanced keyless entry and push button start system)
―  Open circuit in wiring harness between cabin temperature sensor terminal C and body ground
•  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
―  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 non-operating rear defroster
―  Climate control unit (panel switch) malfunction
•  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 BCM terminals 2D, 2E, 2F, 2G, 2H, or 2I
POSSIBLE CAUSE
•  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 BCM terminal 1J
―  False detection of closed door, trunk (4SD)/liftgate (5HB)
•  Door latch switch malfunction
•  Trunk lid latch switch malfunction (4SD)
•  Liftgate latch switch malfunction (5HB)
•  Short to ground in wiring harness between door latch switch and BCM
•  Open circuit in wiring harness between trunk lid latch switch and BCM (4SD)
•  Open circuit in wiring harness between liftgate latch switch and BCM (5HB)
―  False detection of fastened driver seat belt
•  Driver-side buckle switch malfunction
•  Open circuit in wiring harness between driver-side buckle switch terminal A 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 C1280, C1282 and C2770.)
•  Low-G (XY) sensor (built-into SAS control module) initialization malfunction (In this case, the SAS control module records DTC B2477.)
―  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 2BG
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal B and PCM terminal 2Q
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal A and PCM terminal 2AH

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY DTC
•  Retrieve the PCM, TCM, BCM, 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-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.)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
2
DETERMINE IF MALFUNCTION CAUSE IS i-stop OFF SWITCH SIGNAL OR OTHER
•  Start the engine.
•  Verify the i-stop warning light (amber) illumination condition when the i-stop OFF switch is pressed.
•  Does the i-stop warning light (amber) illuminate?
Yes
Go to Step 4.
No
Go to the next step.
3
INSPECT i-stop OFF SWITCH
•  Inspect the i-stop OFF switch.
•  Is there any malfunction?
Yes
Replace the i-stop OFF switch.
(See i-stop OFF SWITCH REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
No
Inspect for continuity between the following terminals (wiring harness-side):
•  i-stop OFF switch terminal I—Instrument cluster terminal 1E
•  i-stop OFF switch terminal G—Body ground
―  If there is any malfunction:
•  Repair or replace the wiring harness for a possible open circuit.
4*
DETERMINE IF MALFUNCTION CAUSE IS AMBIENT TEMPERATURE SENSOR SIGNAL OR OTHER
•  Switch the ignition to ON.
•  Compare the ambient temperature sensor on the information display/multi information display with the actual ambient temperature.
•  Does the ambient temperature on the information display/multi information display correspond to the actual ambient temperature?
Yes
Go to Step 6.
No
Go to the next step.
5
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 BCM terminal 1X
•  Open circuit in wiring harness between ambient temperature sensor terminal B and BCM terminal 1H
―  If there is any malfunction:
•  Repair or replace the suspected wiring harness.
6*
DETERMINE IF MALFUNCTION CAUSE IS INFORMATION DISPLAY/MULTI INFORMATION DISPLAY SIGNAL OR OTHER
•  Idle the engine.
•  Operate the panel switch to switch to the defroster mode.
•  Does the display on the information display/multi information display match the panel switch operation?
Yes
Go to Step 8.
No
Go to the next step.
7
INSPECT INFORMATION DISPLAY/MULTI INFORMATION DISPLAY
•  Inspect the information display/multi information display.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Replace the climate control unit.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
8
VERIFY IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR INITIALIZATION NOT PERFORMED
•  Perform the initialization of the steering angle sensor.
•  Has the malfunction symptom been eliminated?
Yes
Malfunction caused by the steering angle sensor initialization malfunction.
•  Symptom troubleshooting is completed.
No
Go to the next step.
9*
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.
•  Is the TR PID value changing normally according to selector lever position?
Yes
Go to Step 11.
No
Go to the next step.
10
INSPECT M POSITION SWITCH
•  Inspect the M position switch.
•  Is there any malfunction?
Yes
Replace the selector lever component.
(See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)
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.
11*
DETERMINE IF MALFUNCTION CAUSE IS DOOR LATCH SWITCH AND TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (5HB) SIGNAL OR OTHER
•  Switch the ignition to ON.
•  Access the following BCM PIDs using the M-MDS:
―  TR/LG_SW
―  DRSW_D
―  DRSW_P
―  DRSW_LR
―  DRSW_RR
•  Are the PID values congruent with the opening and closing of the doors and trunk (4SD)/liftgate (5HB)?
Yes
Go to Step 13.
No
Go to the next step.
12
INSPECT DOOR LATCH SWITCH AND TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (5HB)
•  Inspect the PID-related switch in which the malfunction occurred in Step 12.
•  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 11:
•  Short to ground in wiring harness between door latch switch and BCM
•  Open circuit in wiring harness between trunk lid latch switch and BCM (4SD)
•  Open circuit in wiring harness between liftgate latch switch and BCM (5HB)
―  If there is any malfunction:
•  Repair or replace the suspected wiring harness.
13*
DETERMINE IF MALFUNCTION CAUSE IS DRIVER-SIDE BUCKLE SWITCH SIGNAL OR OTHER
•  Switch the ignition to ON.
•  Access the SAS control module PID BUCKLE_D using the M-MDS.
•  Is the BUCKLE_D PID value congruent with the seat belt condition?
Yes
Go to Step 15.
No
Go to the next step.
14
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 A and SAS control module terminal 2U for a possible open circuit.
15
DETERMINE IF MALFUNCTION CAUSE IS CABIN TEMPERATURE SENSOR SIGNAL OR OTHER
•  Access the climate control unit PID CABIN_TEMP using the M-MDS.
•  Does the CABIN_TEMP PID value indicate the actual cabin temperature of the vehicle?
Yes
Go to Step 17.
No
Go to the next step.
16
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 D—Climate control unit terminal 2M
•  Cabin temperature sensor terminal B—Climate control unit terminal 2N
•  Cabin temperature sensor terminal A—Relay block terminal 1F (vehicles with advanced keyless entry and push button start system)
•  Cabin temperature sensor terminal A—Ignition switch terminal D (vehicles without advanced keyless entry and push button start system)
•  Cabin temperature sensor terminal C—Body ground
―  If there is any malfunction:
•  Repair or replace the suspected wiring harness.
17*
DETERMINE IF MALFUNCTION CAUSE IS BONNET LATCH SWITCH SIGNAL OR OTHER
•  Switch the ignition to ON.
•  Access the BCM PID HOOD_SW using the M-MDS.
•  Is the HOOD_SW PID value normal?
Yes
Go to Step 19.
No
Go to the next step.
18
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 BCM terminal 1J for a possible short to ground.
19
DETERMINE IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR SIGNAL OR OTHER
•  Switch the ignition to ON.
•  Access the EHPAS control module PID STEER_RATE using the M-MDS.
•  Is the PID value normal?
Yes
Go to Step 21.
No
Go to the next step.
20*
INSPECT STEERING ANGLE SENSOR
•  Inspect the steering angle sensor.
•  Is there any malfunction?
Yes
Replace the steering angle sensor.
(See STEERING ANGLE SENSOR REMOVAL/INSTALLATION.)
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.
21
DETERMINE IF MALFUNCTION CAUSE IS POWER BRAKE UNIT VACUUM SENSOR SIGNAL OR OTHER
•  Start the engine and run it is idling.
•  Access the PCM PID BBP using the M-MDS with the brake pedal held depressed while the i-stop function is operating.
•  Does the BBP PID value remain less than −43 kPa {−0.44 kgf/cm2, −6.2 psi}?
Yes
Go to Step 24.
No
Go to the next step.
22
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 part according to the inspection results.
No
Go to the next step.
23
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 REMOVAL/INSTALLATION (R.H.D.) [SKYACTIV-G 2.0].)
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.
24
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?
Yes
Go to Step 26.
No
Go to the next step.
25
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.
26
INSPECT ABS WHEEL-SPEED SENSOR SIGNAL
•  Inspect the sensor output value from the ABS wheel-speed sensor.
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
27
INSPECT THE CLIMATE CONTROL UNIT
•  Inspect the climate control unit.
•  Is there any malfunction?
Yes
Replace the climate control unit.
(See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
28
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.