NO.5 i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS [SKYACTIV-G 2.5T]

id1103b2001000

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 2Q
?  Open circuit in wiring harness between ambient temperature sensor terminal B and PCM terminal 2V
•  Front 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 A and front climate control unit terminal 1T
?  Open circuit in wiring harness between cabin temperature sensor terminal B and front climate control unit terminal 1I
•  Falsely detects that front 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
?  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 rear body control module (RBCM) terminal 3L
?  False detection of closed door, liftgate
•  Door latch switch malfunction
•  Liftgate latch switch malfunction
•  Short to ground in wiring harness between door latch switch and rear body control module (RBCM)
•  Open circuit in wiring harness between liftgate latch switch and rear body control module (RBCM)
?  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 2N
?  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
•  Power brake unit vacuum sensor malfunction
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal A and PCM terminal 2Z
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal C and PCM terminal 2AF
•  Short or open circuit in wiring harness between power brake unit vacuum sensor terminal B and PCM terminal 2AH
•  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, 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 [PCM (SKYACTIV-G 2.5T)].)
(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (GW6A-EL, GW6AX-EL)])
(See DTC TABLE [FRONT BODY CONTROL MODULE (FBCM)].)
(See DTC TABLE [REAR BODY CONTROL MODULE (RBCM)].)
(See DTC TABLE [DSC HU/CM])
(See DTC TABLE [SAS CONTROL MODULE].)
(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, then go to step 18.
(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
No
Inspect the following:
•  Short or open circuit in wiring harness between ambient temperature sensor terminal A and PCM terminal 2Q
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 2Q.
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 2V
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 2V.
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.
Go to step 18.
4*
DETERMINE IF MALFUNCTION CAUSE IS DOOR LATCH SWITCH AND LIFTGATE LATCH SWITCH SIGNAL OR OTHER
•  Switch the ignition ON (engine off).
•  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 liftgate?
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT DOOR LATCH SWITCH AND LIFTGATE LATCH SWITCH
•  Inspect the PID-related switch in which the malfunction occurred in Step 4.
•  Is there any malfunction?
Yes
Replace the applicable switch, then go to step 18.
(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 liftgate 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 liftgate 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 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.
Go to step 18
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
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, then go to step 18.
(See FRONT BUCKLE REMOVAL/INSTALLATION.)
No
Repair or replace the wiring harness between driver-side buckle switch terminal 5B and SAS control module terminal 2N for a possible open circuit, then go to step 18.
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, then go to step 18.
(See CABIN TEMPERATURE SENSOR REMOVAL/INSTALLATION.)
No
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Cabin temperature sensor terminal A—Front climate control unit terminal 1T
•  Cabin temperature sensor terminal B—Front climate control unit terminal 1I
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—Front climate control unit terminal 1T
•  Cabin temperature sensor terminal B—Front climate control unit terminal 1I
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.
Go to Step 18.
10*
DETERMINE IF MALFUNCTION CAUSE IS BONNET LATCH SWITCH SIGNAL OR OTHER
•  Switch the ignition ON (engine off).
•  Access the rear body control module (RBCM) 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, then go to step 18.
(See BONNET LATCH 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, then go to step 18.
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 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 {33 ft} 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, go to Step 18. (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 go to Step 18.
No
Replace the EPS control module, then go to Step 18.
(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)
14
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 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
Go to Step 16.
No
Go to the next step.
15
INSPECT POWER BRAKE UNIT VACUUM SENSOR
•  Inspect the power brake unit vacuum sensor.
•  Is there any malfunction?
Yes
Replace the power brake unit, then go to step 18.
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].)
(See POWER BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
No
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Power brake unit vacuum sensor terminal A—PCM terminal 2Z
•  Power brake unit vacuum sensor terminal C—PCM terminal 2AF
•  Power brake unit vacuum sensor terminal B—PCM terminal 2AH
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 A—PCM terminal 2Z
•  Power brake unit vacuum sensor terminal C—PCM terminal 2AF
•  Power brake unit vacuum sensor 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 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.
Go to Step 18.
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 driver-side temperature setting is MAX COLD.
?  Front climate control unit terminal 1M
•  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, then go to the next step.
(See FRONT AIR MIX ACTUATOR REMOVAL/INSTALLATION.)
No
Inspect the air mix actuator and linkage for sticking.
(See FRONT A/C UNIT DISASSEMBLY/ASSEMBLY.)
•  If there is any malfunction:
?  Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
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.