NO.5 i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS [SKYACTIV-G 1.5, SKYACTIV-G 2.0]

id1103q7001000

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 malfunction between instrument cluster and PCM
False detection of i-stop function operation conditions
•  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 2R
―  Open circuit in wiring harness between ambient temperature sensor terminal B and PCM terminal 2AI
•  Climate control unit falsely detects that internal vehicle temperature is within operation range. (with full-auto air conditioner system)
―  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 F
―  Open circuit in wiring harness between cabin temperature sensor terminal B and climate control unit terminal E
•  Falsely detects that climate control unit detects that driver-side air mix door is not in MAX COLD position even though driver-side air mix door is in MAX COLD position (with full-auto air conditioner system)
―  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
•  EPS control module malfunction
•  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 3W
―  False detection of closed door bonnet
•  Door latch switch malfunction
•  Bonnet latch switch malfunction
•  Short to ground in wiring harness between door latch switch and BCM
•  Open circuit in wiring harness between bonnet latch switch and BCM
―  False detection of fastened driver seat belt
•  Driver-side buckle switch malfunction
•  Open circuit in wiring harness between driver-side buckle switch terminal 5B and SAS control module terminal 2U
―  False detection of inclination angle (false detection of 7 % 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 (In this case, the SAS control module records DTC U2100:00.)
―  False detection of low power brake unit load
•  Vacuum sensor 2 malfunction
•  Short or open circuit in wiring harness between vacuum sensor 2 terminal A and PCM terminal 2AU
•  Short or open circuit in wiring harness between vacuum sensor 2 terminal C and PCM terminal 2X
•  Short or open circuit in wiring harness between vacuum sensor 2 terminal B and PCM terminal 2AI

•  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
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 [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 [SAS CONTROL MODULE (AIR BAG SYSTEM)].)
(See DTC TABLE [SAS CONTROL MODULE (ACTIVE BONNET)].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO 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).
•  Compare the ambient temperature sensor on the display with the actual ambient temperature.
•  Does the ambient temperature on the display 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 [MANUAL AIR CONDITIONER].)
(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 2R
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 2R.
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 2AI
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 2AI.
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 BONNET LATCH SWITCH SIGNAL OR OTHER
•  Switch the ignition ON (engine off).
•  Access the following BCM PIDs using the M-MDS:
―  TRUNK
―  DOOR_D
―  DOOR_ALL
•  Are the PID values congruent with the opening and closing of the doors and bonnet ?
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT DOOR LATCH SWITCH AND BONNET LATCH SWITCH
•  Inspect the PID-related switch in which the malfunction occurred in Step 4.
•  Is there any malfunction?
Yes
Replace the applicable switch.
(See BONNET LATCH REMOVAL/INSTALLATION.)
(See 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 BCM
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 BCM.
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 bonnet latch switch and BCM
If there is any malfunction:
―  Refer to the wiring diagram and verify whether or not there is a common connector between bonnet latch switch and BCM.
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).
•  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
Vehicles with manual air conditioner system:
•  Go to Step 10.
Vehicles with full-auto air conditioner system:
•  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 BUCKLE REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between driver-side buckle switch terminal 5B 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 F
•  Cabin temperature sensor terminal B—Climate control unit terminal E
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 F
•  Cabin temperature sensor terminal B—Climate control unit terminal E
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).
•  Access the BCM PID HOOD using the M-MDS.
•  Is the HOOD 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 REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between bonnet latch switch terminal A and BCM terminal 3W 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.
•  Access the EPS control module PID STR_ANG using the M-MDS.
•  Is the PID value 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 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 18.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
14
DETERMINE IF MALFUNCTION CAUSE IS VACUUM SENSOR 2 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 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
Vehicles with manual air conditioner system:
•  Go to Step 18.
Vehicles with full-auto air conditioner system:
•  Go to Step 16.
No
Go to the next step.
15
INSPECT VACUUM SENSOR 2
•  Inspect the vacuum sensor 2.
•  Is there any malfunction?
Yes
Replace the vacuum sensor 2.
(See PCM REMOVAL/INSTALLATION [SKYACTIV-G 1.5, SKYACTIV-G 2.0].)
No
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Vacuum sensor 2 terminal A—PCM terminal 2AU
•  Vacuum sensor 2 terminal C—PCM terminal 2X
•  Vacuum sensor 2 terminal B—PCM terminal 2AI
If there is any malfunction:
―  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 2AU
•  Vacuum sensor 2 terminal C—PCM terminal 2X
•  Vacuum sensor 2 terminal B—PCM terminal 2AI
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.
16
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 temperature setting is MAX COLD.
―  Climate control unit terminal G
•  Is the voltage normal?
Yes
Repeat the inspection from Step 1.
•  If the malfunction is not resolved, replace the PCM.
Go to Step 18.
No
Go to the next step.
17
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.
18
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.