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

id1103sc002200

Troubleshooting item

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 ATF temperature within operable range (20 to 117 °C {68 to 243 °F}) (ATX)
―  TFT sensor malfunction
•  Falsely detects that i-stop OFF switch is switched off
―  i-stop OFF switch malfunction
―  Short or open circuit in i-stop OFF switch signal circuit
•  False detection of vehicle not being parked
―  False detection of steering wheel rotation speed
•  Steering angle sensor initialization malfunction
•  EPS control module 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 ambient temperature sensor signal circuit
―  Open circuit in ambient temperature sensor ground circuit
•  False detection of brake pedal depressed
―  Brake switch malfunction
―  Short to power supply in brake switch signal circuit
―  Brake fluid pressure sensor (built-into DSC HU/CM) malfunction
•  Falsely detects that vehicle is under safety condition
―  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, or ground circuit
―  False detection of closed hood
•  Hood latch switch malfunction (stuck closed)
•  Short to ground in hood latch switch signal circuit
―  False detection of closed door, trunk lid (4SD)/liftgate (5HB)
•  Door latch switch malfunction
•  Trunk lid latch switch (4SD)/liftgate latch switch (5HB) malfunction
•  Short to ground in door latch switch signal circuit
•  Open circuit in trunk lid latch switch (4SD)/liftgate latch switch (5HB) signal circuit
―  False detection of fastened driver seat belt
•  Driver-side buckle switch malfunction
•  Open circuit in driver-side buckle switch signal circuit
―  False detection of inclination angle (false detection of 7% or less)
•  Low-G sensor (built-into SAS control module) malfunction (In this case, the SAS control module records DTCs C0061:29 and C0062:29.)
•  Low-G sensor (built-into SAS control module) initialization malfunction (In this case, the SAS control module records DTC U2100:00.)
•  Climate control unit falsely detects that internal vehicle temperature is within operation range.
―  Passenger compartment temperature sensor malfunction (sensor specific or motor malfunction)
―  Short or open circuit in passenger compartment temperature sensor signal circuit
―  Open circuit in passenger compartment temperature sensor ground circuit
•  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.
―  Driver-side air mix actuator malfunction
―  Driver-side air mix actuator position sensor malfunction
―  Driver-side air mix door or linkage stuck
•  False detection that engine coolant temperature is within operation range (30 to 110 °C {86 to 230 °F})
―  Engine coolant temperature sensor malfunction (sensor characteristic malfunction)
―  Short or open circuit in engine coolant temperature sensor signal circuit or ground circuit

Diagnostic procedure

Step

Inspection

Results

Action
1
VERIFY DTC
•  Perform the DTC inspection for the following modules.
―  PCM
―  TCM (ATX)
―  DSC HU/CM
―  Dash-electrical supply unit
―  SAS control module
―  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 [SAS CONTROL MODULE].)
(See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
No
Go to the next step.
2
DETERMINE INSPECTION LOCATION ACCORDING TO MALFUNCTION SYMPTOM
If i-stop function operates even though the i-stop warning light (amber) is turned on:
•  Go to the next step.
If i-stop function operates even though the i-stop OFF switch is turned on:
•  Go to Step 4.
If i-stop function operates (i-stop function operates while parking vehicle in a garage) even though the steering wheel is being operated:
•  Go to Step 6.
If i-stop function operates even though the brake pedal is not depressed:
•  Go to Step 7.
If i-stop function operates even though the hood is open:
•  Go to Step 11.
If i-stop function operates even though the doors, trunk lid (4SD), or liftgate (5HB) is opened:
•  Go to Step 13.
If i-stop function operates even though the seat belt is not fastened:
•  Go to Step 16.
If i-stop function operates even though there is a steep slope:
•  Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
•  If the CAN communication is normal, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the SAS control module, then perform the repair completion verification 1.
If i-stop function operates even though the ambient temperature is outside of the operation range:
•  Go to Step 18.
If i-stop function operates even though the cabin temperature is outside of the operation range:
•  Go to Step 21.
If i-stop function operates even though the A/C output is high:
•  Go to Step 24.
If i-stop function operates even though the engine coolant temperature is outside of the operation range:
•  Go to Step 25.
3
DETERMINE IF MALFUNCTION CAUSE IS CAN COMMUNICATION LINE BETWEEN INSTRUMENT CLUSTER AND PCM OR OTHER
•  Access the instrument cluster PID I-STOP_OFF_SW during an engine stop by the i-stop control using the M-MDS.
•  Is the PID value “off”?
Yes
i-stop warning light (amber) illumination circuit malfunction in instrument cluster can be considered.
•  Replace the instrument cluster and perform the repair completion verification 1.
No
Malfunction in CAN communication circuit between instrument cluster and PCM can be considered.
•  Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
•  Repair or replace the malfunctioning location and perform the repair completion verification 1.
4
INSPECT i-stop OFF SWITCH 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 CLUSTER SWITCH REMOVAL/INSTALLATION.)
5
INSPECT i-stop OFF SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT AND OPEN CIRCUIT
•  Inspect the applicable circuit for a short circuit and open circuit.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the instrument cluster, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
6
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)].)
7
INSPECT BRAKE SWITCH 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 BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D. (E)].)
(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
8
INSPECT BRAKE SWITCH 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.
9
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)].)
10
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
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the PCM, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
11
INSPECT HOOD LATCH SWITCH 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 HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION [(E)].)
12
INSPECT HOOD LATCH SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Inspect the applicable circuit for a short to ground.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the body control module (BCM), then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
13*
INSPECT DOOR LATCH SWITCH AND TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (5HB) FOR MALFUNCTION
•  Switch the ignition ON (engine off).
•  Access the following body control module (BCM) PIDs using the M-MDS:
―  DOOR_SW_ALL (all door latch switches)
―  DOOR_SW_D (driver-side door latch switch)
―  DOOR_SW_L/R (rear door latch switch (LH))
―  DOOR_SW_P (passenger-side door latch switch)
―  DOOR_SW_R/R (rear door latch switch (RH))
―  T/LGT_SW (trunk lid latch switch (4SD)/liftgate latch switch (5HB))
•  Inspect the switch which the open/close operation of the doors, trunk lid (4SD), or liftgate (5HB) is not in conjunction with the PID value.
•  Is the part normal?
Yes
If DOOR_SW_ALL, DOOR_SW_D, DOOR_SW_L/R, or DOOR_SW_R/R PID has a malfunction:
•  Go to the next step.
If T/LGT_SW PID has a malfunction:
•  Go to Step 15.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
(See FRONT DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See REAR DOOR LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
(See TRUNK LID LATCH AND RELEASE ACTUATOR REMOVAL/INSTALLATION.)
(See LIFTGATE LATCH AND LOCK ACTUATOR REMOVAL/INSTALLATION.)
14
INSPECT DOOR LATCH SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
•  Inspect the PID-related switch circuit in which the malfunction occurred in Step 13 for a short to ground.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the door-electrical supply unit, electrical supply unit (ESU), or body control module (BCM) then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
15
INSPECT TRUNK LID LATCH SWITCH (4SD)/LIFTGATE LATCH SWITCH (5HB) SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Inspect the applicable circuit for an open circuit.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the electrical supply unit (ESU), then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
16
INSPECT DRIVER-SIDE BUCKLE SWITCH 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 FRONT BUCKLE REMOVAL/INSTALLATION [(E)].)
17
INSPECT DRIVER-SIDE BUCKLE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Inspect the applicable circuit for an open circuit.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the dash-electrical supply unit, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
18
INSPECT AMBIENT TEMPERATURE 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 AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
19
INSPECT AMBIENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT CIRCUIT AND OPEN CIRCUIT
•  Inspect the applicable circuit for a short circuit and open circuit.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
20
INSPECT AMBIENT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Inspect the applicable circuit for an open circuit.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the PCM, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
21
INSPECT PASSENGER COMPARTMENT TEMPERATURE 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 PASSENGER COMPARTMENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER (E)].)
22
INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR SIGNAL CIRCUIT FOR SHORT CIRCUIT AND OPEN CIRCUIT
•  Inspect the applicable circuit for a short circuit and open circuit.
•  Is the circuit normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
23
INSPECT PASSENGER COMPARTMENT TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN CIRCUIT
•  Inspect the applicable circuit for an open circuit.
•  Is the circuit normal?
Yes
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the climate control unit, then perform the repair completion verification 1.
No
Repair or replace the malfunctioning location and perform the repair completion verification 1.
24
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:
•  Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
―  If the CAN communication is normal, repeat the inspection from Step 1.
•  If the malfunction recurs, replace the dash-electrical supply unit, then perform the repair completion verification 1.
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)].)
25
INSPECT ENGINE COOLANT TEMPERATURE 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 ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
26
INSPECT ENGINE COOLANT TEMPERATURE SENSOR 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
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, repeat the inspection from Step 1.
―  If the malfunction recurs, replace the PCM, then perform the repair completion verification 1.
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].)