Diagnostic Procedure

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LIMITED I-STOP FUNCTION OPERATION TIME (PYUL) DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	INSPECT EFFECT OF NON-GENUINE ELECTRICAL ACCESSORY FOR CAUSE OF MALFUNCTION Remove any non-genuine electrical accessory. Verify the malfunction symptom. 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.
1		No	Go to the next step.
2	VERIFY DTCs Perform the DTC inspection for the following modules. (See DTC INSPECTION .) PCM TCM Electronically controlled brake unit/DSC HU/CM Dash-electrical supply unit Body control module (BCM) Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (PYUL)] .) (See DTC TABLE [TCM (PM8AX-EC)] .) (See DTC TABLE [DSC] .) (See DTC TABLE [DASH_ESU] .) (See DTC TABLE [BCM] .)
2		No	Go to the next step.
3	VERIFY BATTERY FOR MALFUNCTION Inspect the applicable part. (Refer to [BATTERY INSPECTION ] ). Is the part normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [BATTERY RECHARGING ] ). (Refer to [BATTERY REMOVAL/INSTALLATION ] ).
4	VERIFY GENERATOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ GENERATOR INSPECTION in the appropriate service information] ). Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ GENERATOR REMOVAL/INSTALLATION in the appropriate service information] ).
5	DETERMINE IF MALFUNCTION CAUSE IS STEERING ANGLE SENSOR SIGNAL OR OTHER Start the engine and let it idle. Access the EPS control module PID [STR_ANG] using the M-MDS. (See PID/DATA MONITOR INSPECTION .) Is the monitoring value normal? (See PID/DATA MONITOR TABLE [EPS] .)	Yes	Go to Step 8.
5		No	Go to the next step.
6	VERIFY STEERING ANGLE SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [STEERING ANGLE SENSOR INSPECTION ] ). Is the part normal?	Yes	Go to the next step.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [CLOCK SPRING REMOVAL/INSTALLATION ] ).
7	VERIFY EPS CONTROL MODULE FOR MALFUNCTION Inspect the applicable part. (Refer to [EPS CONTROL MODULE INSPECTION ] ). Is the part normal?	Yes	Perform the following procedure: Switch the ignition off, and after 2 min or more have elapsed, switch the ignition ON. Start the engine and drive the vehicle on a straight road for 10 m {32 ft 10 in} or more at a speed of 10 km/h {6.2 mph} or more. Stop the vehicle with the wheels in the straight-ahead position. Access the EPS control module PID [STR_ANG] using the M-MDS. (See PID/DATA MONITOR INSPECTION .) 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. (Refer to [STEERING GEAR AND LINKAGE REMOVAL/INSTALLATION ] ).
7		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [STEERING GEAR AND LINKAGE REMOVAL/INSTALLATION ] ).
8	DETERMINE IF MALFUNCTION CAUSE IS POWER BRAKE UNIT VACUUM SENSOR SIGNAL OR OTHER Put the vehicle in an i-stop condition (engine stopped). Access the PCM PID [BRK_BSTR_PRES_ACT] using the M-MDS with the brake pedal depressed and the engine stopped. (See PID/DATA MONITOR INSPECTION .) Does the PID value remain less than -43 KPa {-0.44 kgf/cm² , -6.2 psi}?	Yes	Go to Step 12.
8		No	Go to the next step.
9	INSPECT POWER BRAKE UNIT VACUUM SENSOR FOR AIR TIGHTNESS MALFUNCTION Perform the vacuum function inspection for the power brake unit and the vacuum loss inspection. (Refer to [ POWER BRAKE UNIT INSPECTION in the appropriate service information] ). Is there any malfunction?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification 1.
9		No	Go to the next step.
10	VERIFY POWER BRAKE UNIT VACUUM SENSOR FOR MALFUNCTION Inspect the applicable part. (Refer to [ POWER BRAKE UNIT VACUUM SENSOR INSPECTION in the appropriate service information(s)] ). Is the part normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification 1. (Refer to [ POWER BRAKE UNIT REMOVAL/INSTALLATION] ).
11	INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN ELECTRONICALLY CONTROLLED BRAKE UNIT/DSC HU/CM AND POWER BRAKE UNIT VACUUM SENSOR FOR MALFUNCTION Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Perform the repair completion verification 1.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification 1.
12	DETERMINE IF MALFUNCTION CAUSE IS BRAKE FLUID PRESSURE SENSOR SIGNAL OR OTHER Put the vehicle in an i-stop condition (engine stopped). Monitor the electronically controlled brake unit/DSC HU/CM PID [BRK_FLD_PRES] using the M-MDS while the brake is depressed and held with the i-stop function operating. (See PID/DATA MONITOR INSPECTION .) Does the monitoring value change?	Yes	Go to the next step.
12		No	Brake fluid pressure sensor malfunction. Replace the electronically controlled brake unit/DSC HU/CM, then perform the repair completion verification 1. (Refer to [ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION ] ). (Refer to [ DSC HU/CM REMOVAL/INSTALLATION] ).
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)
Repair completion verification 1		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1. If the malfunction recurs, replace the PCM. (Refer to [PCM REMOVAL/INSTALLATION ] ).