NO.34 LIMITED i-stop FUNCTION OPERATION TIME [MZR 2.0 DISI i-stop]

id0103d3333900

34

LIMITED i-stop FUNCTION OPERATION TIME
DESCRIPTION
•  Frequency of which i-stop function operates is low.
•  Frequent occurrence of engine restarting other than for driving vehicle from stop.
POSSIBLE CAUSE
Main battery voltage low during i-stop function operation
•  Main battery deterioration
•  Insufficient main battery recharge while engine is running
―  Low recharge effect
•  Generator malfunction
•  Generator control malfunction
―  Battery management system malfunction
•  Power relay malfunction
•  Power drive relay malfunction
•  High electrical load from aftermarket electrical accessories
False detection of engine starting conditions
•  False detection of main battery voltage
•  False detection of A/C operation conditions
―  Malfunction of driver-side air mix actuator position sensor (false detection of MAX HOT, MAX COLD position)
―  Heater core temperature sensor (heater airflow temperature sensor) malfunction
―  Short or open circuit in wiring harness between heater core temperature sensor terminal B and climate control unit terminal 1O
―  Climate control unit malfunction
•  False detection of rear defroster operation signal
―  Climate control unit malfunction (panel switch malfunction)
•  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)
•  False detection of i-stop system non-operation condition (operation cancellation not detected)
―  i-stop OFF switch malfunction
―  Short to ground in wiring harness between i-stop OFF switch terminal I and PCM terminal 1AV
False recognition of driver performing engine start operation
•  False recognition of depressed clutch pedal
―  Clutch stroke sensor malfunction
―  Short or open circuit in wiring harness between the following terminals:
•  Clutch stroke sensor terminal C—PCM terminal 1N
•  Clutch stroke sensor terminal D—PCM terminal 1P
•  Clutch stroke sensor terminal B—PCM terminal 1AS
•  False recognition of depressed accelerator pedal
―  APP sensor malfunction

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Retrieve the PCM, BCM, DSC HU/CM, 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 ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
(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 ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)].)
(See DTC TABLE [INSTRUMENT CLUSTER].)
(See DTC TABLE [FULL-AUTO AIR CONDITIONER].)
No
Go to the next step.
2
Verify the condition of the i-stop warning light (amber) when the engine restarts.
Does the i-stop warning light (amber) 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 short to ground.
4
Switch the ignition to ON.
Access the following PCM PIDs using the M-MDS when the accelerator pedal is not depressed:
(See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI i-stop].)
•  APP1
•  APP2
Are the PID values normal?
(See PCM INSPECTION [MZR 2.0 DISI i-stop].)
Yes
Go to the next step.
No
Replace the accelerator pedal.
(See ACCELERATOR PEDAL REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
5*
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 7.
No
Go to the next step.
6
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
Inspect the wiring harness between the following terminals for a short or open circuit:
•  Clutch stroke sensor terminal C—PCM terminal 1N
•  Clutch stroke sensor terminal D—PCM terminal 1P
•  Clutch stroke sensor terminal B—PCM terminal 1AS
Repair or replace the suspected wiring harness.
7
Put the vehicle in an idling-stop condition (engine stopped).
Access the PCM PID BBP using the M-MDS with the brake pedal depressed and the engine stopped.
(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 10.
No
Go to the next step.
8
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.
9
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.
10
Remove any non-genuine electrical accessory.
Is the frequency of the engine restarting from the i-stop off condition the same as that of another vehicle of the same model?
Yes
The system is normal.
•  Explain to the customer that the frequency of the engine restarting increases due to the effect of the non-genuine electrical accessory installed.
No
Go to the next step.
11
Inspect the main battery.
(See BATTERY INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Go to the next step.
No
Go to Step 14.
12
Recharge the main battery.
(See BATTERY RECHARGING [MZR 2.0 DISI i-stop].)
Inspect the main battery again.
(See BATTERY INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Replace the main battery.
(See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
No
Go to the next step.
13
Inspect the generator.
(See GENERATOR INSPECTION [MZR 2.0 DISI i-stop].)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
14
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
Go to Step 16.
No
Go to the next step.
15*
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.
16
Measure the voltage at the climate control unit terminal 1O while the engine is stopped via i-stop control.
Do the elapsed time and voltage values change?
Yes
Go to Step 18.
No
Go to the next step.
17
Inspect the heater core temperature sensor.
(See HEATER CORE TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
Is there any malfunction?
Yes
Replace the heater core temperature sensor.
(See HEATER CORE TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
No
Repair or replace the wiring harness between heater core temperature sensor terminal B and PCM terminal 1O for a possible short or open circuit.
18
Verify the heater core temperature sensor installation condition.
Is the heater core temperature sensor installation condition normal?
Yes
Replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZR 2.0 DISI i-stop].)
No
Repair the heater core temperature sensor installation position.
(See HEATER CORE TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
19
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.
20
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].)