NO.32 i-stop FUNCTION OPERATES UNDER NO ENGINE-STOP CONDITIONS [MZR 2.0 DISI i-stop]

id0103d3333700

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 PCM terminal 1AV
•  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 shift lever in neutral position
―  Neutral switch No.1 malfunction
―  Neutral switch No.2 malfunction
―  Short to ground in wiring harness between the following terminals:
•  Neutral switch No.1 terminal A—PCM terminal 2AA
•  Neutral switch No.2 terminal A—PCM terminal 1AJ
•  False detection of depressed clutch pedal
―  Clutch stroke sensor malfunction
―  Short to ground in wiring harness between clutch stroke sensor terminal B and PCM terminal 1AS
•  False detection of internal/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
•  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
•  False detection of low power brake unit load
―  Power brake unit vacuum sensor malfunction
―  Short or open circuit in wiring harness between the following terminals:
•  Power brake unit vacuum sensor terminal A—PCM terminal 1P
•  Power brake unit vacuum sensor terminal B—PCM terminal 1Q
•  Power brake unit vacuum sensor terminal C—PCM terminal 1N
―  Power brake unit malfunction (air tightness malfunction)
―  Malfunction in vacuum hose to power brake unit (damage, bad check valve)
•  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, liftgate/trunk
•  Door latch switch malfunction
•  Liftgate/trunk lid latch switch malfunction
•  Short to ground in wiring harness between door latch switch and BCM
•  Open circuit in wiring harness between liftgate/trunk lid 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 and SAS control module terminal 2U

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Retrieve the PCM, BCM, SAS control module, instrument cluster and climate control unit (full-auto air conditioner) DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI i-stop].)
(See DTC INSPECTION [BCM].)
(See DTC INSPECTION.)
(See DTC INSPECTION [INSTRUMENT CLUSTER].)
(See DTC DISPLAY [FULL-AUTO AIR CONDITIONER].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 2.0 DISI i-stop].)
(See DTC TABLE [BCM].)
(See DTC TABLE.)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
2
Start the engine.
Verify the i-stop warning light illumination condition when the i-stop OFF switch is pressed.
Does the i-stop warning light illuminate?
Yes
Go to Step 4.
No
Go to the next step.
3
Inspect the i-stop OFF switch.
(See i-stop OFF SWITCH INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Replace the i-stop OFF switch.
(See i-stop OFF SWITCH REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
No
Repair or replace the wiring harness between i-stop OFF switch terminal I and PCM terminal 1AV for a possible open circuit.
4
Perform the initialization of the steering angle sensor.
(See STEERING ANGLE SENSOR INITIALIZATION PROCEDURE.)
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.
5*
Switch the ignition to ON.
Compare the ambient temperature sensor on the information display with the actual ambient temperature.
Does the ambient temperature on the information display correspond to the actual ambient temperature?
Yes
Go to Step 7.
No
Go to the next step.
6
Inspect the ambient temperature sensor.
(See AMBIENT TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
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
Repair or replace the suspected wiring harness.
7
Inspect the sensor output value from the ABS wheel-speed sensor.
(See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)
(See REAR ABS WHEEL-SPEED SENSOR INSPECTION.)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
8*
Switch the ignition to ON.
Access the PCM PID CPP using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI i-stop].)
Does the CPP PID value change according to the amount the clutch pedal is depressed?
(See PCM INSPECTION [MZR 2.0 DISI i-stop].)
Yes
Go to Step 10.
No
Go to the next step.
9
Inspect the clutch stroke sensor.
(See CLUTCH STROKE SENSOR INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Replace the clutch stroke sensor.
(See CLUTCH STROKE SENSOR REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
No
Repair or replace the wiring harness between clutch stroke sensor terminal B and PCM terminal 1AS for a possible short to ground.
10*
Switch the ignition to ON.
Access the following PCM PID using the M-MDS:
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI i-stop].)
•  NEUTRAL_SW1
•  NEUTRAL_SW2
Is the PID values congruent with the shift lever operation?
(See PCM INSPECTION [MZR 2.0 DISI i-stop].)
Yes
Go to Step 12.
No
Go to the next step.
11
Inspect the PID-related switch in which the malfunction occurred in Step 10.
(See NEUTRAL SWITCH INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Replace the applicable switch.
(See NEUTRAL SWITCH NO.1 REMOVAL/INSTALLATION [G66M-R (MZR 2.0 DISI i-stop)].)
(See NEUTRAL SWITCH NO.2 REMOVAL/INSTALLATION [G66M-R (MZR 2.0 DISI i-stop)].)
No
Inspect the wiring harness between the following terminals in which the malfunction occurred in Step 10 for a short to ground:
•  Neutral switch No.1 terminal A—PCM terminal 2AA
•  Neutral switch No.2 terminal A—PCM terminal 1AJ
Repair or replace the suspected wiring harness.
12*
Switch the ignition to ON.
Access the BCM PID HOOD_SW using the M-MDS.
(See PID/DATA MONITOR INSPECTION [BCM].)
Is the HOOD_SW PID value normal?
(See PID/DATA MONITOR TABLE [BCM].)
Yes
Go to Step 14.
No
Go to the next step.
13
Inspect the bonnet latch switch.
(See BONNET LATCH SWITCH INSPECTION.)
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.
14*
Switch the ignition to ON.
Access the following BCM PIDs using the M-MDS:
(See PID/DATA MONITOR INSPECTION [BCM].)
•  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 liftgate/trunk?
(See PID/DATA MONITOR TABLE [BCM].)
Yes
Go to Step 16.
No
Go to the next step.
15
Inspect the PID-related switch in which the malfunction occurred in Step 14.
(See TRUNK LID LATCH SWITCH INSPECTION.)
(See LIFTGATE LATCH SWITCH INSPECTION.)
(See FRONT DOOR LATCH SWITCH INSPECTION.)
(See REAR DOOR LATCH SWITCH INSPECTION.)
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 14:
•  Short to ground in wiring harness between door latch switch and BCM
•  Open circuit in wiring harness between liftgate/trunk lid latch switch and BCM
Repair or replace the suspected wiring harness.
16*
Switch the ignition to ON.
Access the SAS control module PID BUCKLE_D using the M-MDS.
(See PID/DATA MONITOR INSPECTION.)
Is the BUCKLE_D PID value congruent with the seat belt condition?
(See PID/DATA MONITOR TABLE.)
Yes
Go to Step 18.
No
Go to the next step.
17
Inspect the driver-side buckle switch.
(See BUCKLE SWITCH INSPECTION.)
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 and SAS control module terminal 2U for a possible open circuit.
18*
Switch the ignition to ON.
Access the EHPAS PID STEER_RATE using the M-MDS.
(See ELECTRO HYDRAULIC POWER ASSIST STEERING (EHPAS) ON-BOARD DIAGNOSIS.)
Is the PID value normal?
Yes
Go to Step 20.
No
Perform the initialization of the steering angle sensor and verify the PID values again.
(See STEERING ANGLE SENSOR INITIALIZATION PROCEDURE.)
•  If the PID values are normal:
―  Steering angle sensor initialization malfunction. (The symptom troubleshooting is completed.)
•  If the PID values are not normal:
―  Go to the next step.
19
Inspect the steering angle sensor.
(See STEERING ANGLE SENSOR INSPECTION.)
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
Repair or replace the suspected wiring harness.
20*
Idle the engine.
Access the PCM PID BBP using the M-MDS with the brake pedal held depressed while the i-stop function is operating.
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI i-stop].)
Does the BBP PID value remain less than −45 kPa {−0.46 kgf/cm2, −6.5 psi}?
Yes
Go to Step 23.
No
Go to the next step.
21
Perform the vacuum function inspection for the power brake unit and the vacuum loss inspection.
(See POWER BRAKE UNIT INSPECTION.)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
22
Inspect the power brake unit vacuum sensor.
(See POWER BRAKE UNIT VACUUM SENSOR INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Replace the power brake unit vacuum sensor.
(See POWER BRAKE UNIT REMOVAL/INSTALLATION (L.H.D.) [MZR 1.6, MZR 2.0, MZR 2.0 DISI i-stop, MZ-CD 1.6, MZR-CD 2.2].)
(See POWER BRAKE UNIT REMOVAL/INSTALLATION (R.H.D.) [MZR 2.0 DISI i-stop].)
No
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Power brake unit vacuum sensor terminal A—PCM terminal 1P
•  Power brake unit vacuum sensor terminal B—PCM terminal 1Q
•  Power brake unit vacuum sensor terminal C—PCM terminal 1N
Repair or replace the suspected wiring harness.
23
Measure the voltage at the climate control unit terminal 1G when the driver-side temperature setting is MAX HOT and MAX COLD.
Is the voltage normal?
(See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)
Yes
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
No
Go to the next step.
24
Inspect the driver-side air mix actuator.
(See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
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.)
Repair or replace the malfunctioning part according to the inspection results.
25
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.
26
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [MZR 2.0 DISI i-stop].)
•  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. (See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)