RM38N0EC _51 Engine / Hybrid System _111803 STOP AND START _0509671 STOP AND START SYSTEM C

STOP AND START  STOP AND START SYSTEM  P323A00  Backup Boost Converter "A"  P323A16  Backup Boost Converter "A" Circuit Voltage Below Threshold  P323B14  Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open  P323B29  Backup Boost Converter "A" Control Circuit Signal Invalid  P323B38  Backup Boost Converter "A" Control Circuit Signal Cycle Invalid  


DESCRIPTION

A backup boost converter is built into the engine stop and start ECU.

The backup boost converter helps maintain battery voltage to prevent various functions from failing if power source voltage supplied from the backup boost converter drops due to the high electrical load when the engine is restarted by stop and start control.

The backup boost converter helps maintain the power source voltage if the battery voltage drops due to the high electrical load when the engine is restarted by stop and start control.

HINT:

A relay function and fuse function are provided in the backup boost converter.

If there is a malfunction in any of the electrical system circuits connected to the backup boost converter, the fuse and relay functions shut off the malfunctioning circuit to protect other circuits (remains shut off until next trip).

When the electrical system circuit is shut off, power to the circuit is cut off, causing any systems connected to the circuit to be disabled.

The fuse function is reset* when the ignition switch is turned off. If the malfunction still exists in the electrical system circuit that has been shut off by the relay function, it will be shut off again by the relay and fuse functions the next time the ignition switch is turned to ON.

*: A semiconductor fuse self resets according to electric signal.

The backup boost converter supplies power to:
·

Tire pressure warning system

·

Panoramic view monitor system

·

Parking support brake system

·

Digital rear-view mirror system

·

Front radar sensor system

·

Air conditioning system

·

Headup display system

·

Electronically controlled brake system

·

Meter / gauge system

·

Power steering system



DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
P323A00 Backup Boost Converter "A" The following conditions is met for 1 second or more (1 trip detection logic):
·

Backup boost converter malfunction is detected.


·

Engine stop and start ECU

·

Wire harness or connector

·

Battery

·

BBC NO. 1 fuse

·

BBC NO. 2 fuse


Blinks SAE Code: P323A
P323A16 Backup Boost Converter "A" Circuit Voltage Below Threshold One of the following conditions is met for 2 second or more (1 trip detection logic):
·

B41 or IG41 voltage is 6.0 V or less and backup boost converter output overcurrent is not detected.

·

B43 voltage is 6.0 V or less, backup boost converter is not overheating and backup boost converter output overcurrent is not detected.


·

Engine stop and start ECU

·

Wire harness or connector

·

Battery

·

BBC NO. 1 fuse

·

BBC NO. 2 fuse


Blinks SAE Code: P323A
P323B14 Backup Boost Converter "A" Control Circuit Circuit Short to Ground or Open The following conditions is met for 1 second or more (1 trip detection logic):
·

Backup boost converter malfunction is detected.


·

Engine stop and start ECU

·

Wire harness or connector

·

Battery

·

BBC NO. 1 fuse

·

BBC NO. 2 fuse


Blinks SAE Code: P323D
P323B29 Backup Boost Converter "A" Control Circuit Signal Invalid The following conditions is met for 1 second or more (1 trip detection logic):
·

Backup boost converter malfunction is detected.


·

Engine stop and start ECU

·

Wire harness or connector

·

Battery

·

BBC NO. 1 fuse

·

BBC NO. 2 fuse


Blinks SAE Code: P323C
P323B38 Backup Boost Converter "A" Control Circuit Signal Cycle Invalid The following conditions is met for 1 second or more (1 trip detection logic):
·

Backup boost converter malfunction is detected.


·

Engine stop and start ECU

·

Wire harness or connector

·

Battery

·

BBC NO. 1 fuse

·

BBC NO. 2 fuse


Blinks SAE Code: P323C

CONFIRMATION DRIVING PATTERN

CONFIRMATION AFTER TROUBLESHOOTING


HINT:
·

If the cable is disconnected from the battery terminal, stop and start control is prohibited until refresh charge is completed.

In this case, let the vehicle idle to complete the refresh charge. The refresh charge is complete when the Data List item "Status of Battery Charge Control" changes from "Refresh Charge Mode". (Usually, idling the engine for 5 to 60 minutes with the battery fluid temperature at 11°C (52°F) or higher, the refresh charge will be completed.)

·

If the GTS is not available and the Data List item "Status of Battery Charge Control" cannot be checked, charge the battery by idling the engine for approximately 5 to 60 minutes or driving the vehicle, and then drive the vehicle and check that stop and start control operates.

If the engine is started with the hood open, the system determines that a jump start has occurred. Therefore, make sure that the hood is closed before starting the engine and driving the vehicle.

·

After the refresh charge completes, turn the ignition switch off, wait for at least 30 seconds, and then start the engine again. If the vehicle enters refresh charge mode again while the engine is idling, the initial refresh charge did not properly complete, so wait for the refresh charge to complete.

·

Allow the engine to idle for 3 minutes after it is warmed up and check that the engine idle speed is within 50 rpm of the target idle speed.



a.

Clear the DTCs.

Powertrain > Stop and Start > Clear DTCs
50002 392

b.

Start the engine and warm it up.


c.

Drive the vehicle at 7 km/h (4.3 mph) or more.

CAUTION:

When performing Confirmation Driving Pattern, obey all speed limits and traffic laws.



d.

Depress the brake pedal and stop the vehicle.


e.

Keep the engine stopped by stop and start control for 1 second or more. (Keep the shift lever in D.)


f.

Release the brake pedal with the shift lever in D to start the engine.

HINT:

If the engine cranks slowly when the engine is restarted, it can be determined that the battery voltage is low.



g.

Check that DTCs are not output.

Powertrain > Stop and Start > Trouble Codes
50001 392


STOP AND START SYSTEM OPERATION CHECK


Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>OPERATION CHECK


WIRING DIAGRAM

A574587E01
0.146,7.667 0.458,7.865 0.313,0.198 10 false A 4.885,0.333 5.219,0.51 0.333,0.177 10 false 12 4.896,2.698 5.229,2.875 0.333,0.177 10 false 40 1.094,2.708 1.427,2.885 0.333,0.177 10 false 9 4.896,3.135 5.229,3.313 0.333,0.177 10 false 36 4.896,3.479 5.229,3.656 0.333,0.177 10 false 41 5.792,4.688 6.125,4.865 0.333,0.177 10 false 18 5.813,2.698 6.146,2.875 0.333,0.177 10 false 21 5.802,0.333 6.135,0.51 0.333,0.177 10 false 19 5.708,0.51 6.115,0.729 0.406,0.219 10 false A104 5.708,5.906 6.104,6.073 0.396,0.167 10 false A105 4.635,6.052 5.417,6.281 0.781,0.229 10 false BBC NO. 1 4.615,6.74 5.354,6.938 0.74,0.198 10 false BBC NO. 2 2.115,4.49 5.031,4.708 2.917,0.219 10 false Power Distribution Box Assembly 3.031,1.229 3.5,1.438 0.469,0.208 10 false ACC 3.854,0.667 4.573,0.875 0.719,0.208 10 false ECU-ACC 3.948,3.01 5.031,3.323 1.083,0.313 10 false METER-IGR 2.844,3.604 3.604,3.813 0.76,0.208 10 false IGR NO. 1 4.875,0.51 5.208,0.688 0.333,0.177 10 false 4B 4.896,2.875 5.229,3.052 0.333,0.177 10 false 4B 1.052,2.885 1.385,3.063 0.333,0.177 10 false 4B 4.896,3.302 5.229,3.479 0.333,0.177 10 false 4B 1.063,3.219 1.396,3.396 0.333,0.177 10 false 4B 4.885,3.635 5.219,3.813 0.333,0.177 10 false 4C 6.125,2.885 6.458,3.063 0.333,0.177 10 false IGR 6.115,4.865 6.448,5.042 0.333,0.177 10 false IGP 6.115,5.906 6.583,6.115 0.469,0.208 10 false BIN1 6.125,6.573 6.594,6.781 0.469,0.208 10 false BIN2 5.979,7.896 7.021,8.438 1.042,0.542 10 false Engine Stop and Start ECU 1.063,3.052 1.396,3.229 0.333,0.177 10 false 39 5.823,6.385 6.156,6.563 0.333,0.177 10 false 1 5.833,5.719 6.167,5.896 0.333,0.177 10 false 3 6.115,0.51 6.583,0.719 0.469,0.208 10 false ACC 4.521,5.021 5.635,5.26 1.115,0.24 10 false ECU-IGP NO. 3 3.469,5.594 3.958,5.802 0.49,0.208 10 false IGP 0.375,7.667 0.708,7.844 0.333,0.177 10 false B 5.708,2.875 6.125,3.083 0.417,0.208 10 false A104 5.708,4.865 6.115,5.063 0.406,0.198 10 false A104 5.708,6.563 6.104,6.729 0.396,0.167 10 false A105 1.052,3.677 1.385,3.854 0.333,0.177 10 false 4B 1.063,3.5 1.375,3.698 0.313,0.198 10 false 11 1.51,3.021 2.271,3.229 0.76,0.208 10 false AM2 0.625,7.667 0.958,7.844 0.333,0.177 10 false C 2.229,7.708 2.563,7.885 0.333,0.177 10 false E 0.865,7.667 1.198,7.844 0.333,0.177 10 false D 3.104,4.771 3.26,4.969 0.156,0.198 10 false 5 3.969,4.76 4.125,4.958 0.156,0.198 10 false 3 3.052,5.198 3.208,5.396 0.156,0.198 10 false 2 3.99,5.198 4.146,5.396 0.156,0.198 10 false 1 5.448,1.01 5.604,1.208 0.156,0.198 10 false F 4.74,4.74 4.896,4.938 0.156,0.198 10 false 1 4.719,5.792 4.875,5.99 0.156,0.198 10 false 1 4.719,6.448 4.875,6.646 0.156,0.198 10 false 1 5.167,4.74 5.323,4.938 0.156,0.198 10 false 2 5.083,5.792 5.24,5.99 0.156,0.198 10 false 2 5.094,6.448 5.25,6.646 0.156,0.198 10 false 2 1.063,2.344 1.396,2.521 0.333,0.177 10 false 4H 0.344,0.635 0.979,1.031 0.635,0.396 10 false INP STD NO. 1-2 0.24,2 0.573,2.177 0.333,0.177 10 false ALT 1.063,1.563 1.396,1.74 0.333,0.177 10 false 4G 1.104,2.177 1.26,2.375 0.156,0.198 10 false 1 1.104,0.313 1.26,0.51 0.156,0.198 10 false 1 2.188,5.01 2.729,5.198 0.542,0.188 10 false IGP 0.344,2.479 0.979,2.875 0.635,0.396 10 false INP STD NO. 1-3 0.354,1.667 0.958,2.052 0.604,0.385 10 false INP STD NO. 1-1 3.01,2.302 3.479,2.51 0.469,0.208 10 false TAIL 1.063,0.521 1.396,0.698 0.333,0.177 10 false 4F 5.708,1.552 6.094,1.792 0.385,0.24 10 false A104 6.135,1.573 6.469,1.75 0.333,0.177 10 false ILL 4.885,1.552 5.219,1.729 0.333,0.177 10 false 4E 4.938,1.375 5.271,1.552 0.333,0.177 10 false 7 5.813,1.385 6.146,1.563 0.333,0.177 10 false 20 1.104,1.385 1.26,1.583 0.156,0.198 10 false 1 1.073,3.875 1.385,4.073 0.313,0.198 10 false 17 1.063,4.052 1.375,4.25 0.313,0.198 10 false 4C 4.885,4.063 5.198,4.26 0.313,0.198 10 false 4D 4.885,3.875 5.198,4.073 0.313,0.198 10 false 13

A509646E01
0.177,1.094 0.49,1.292 0.313,0.198 10 false A 1.083,1.104 1.417,1.281 0.333,0.177 10 false B 5.896,4.375 6.229,4.552 0.333,0.177 10 false 19 2.667,1.813 3.135,2.021 0.469,0.208 10 false IGPD 0.469,7.677 1.844,7.906 1.375,0.229 10 false Battery 2.542,3.208 5.729,3.521 3.188,0.313 10 false Certification ECU (Smart Key ECU Assembly) 2.313,1.813 2.646,1.99 0.333,0.177 10 false A15 6.198,4.604 6.667,4.813 0.469,0.208 10 false DON2 6.031,7.521 7.073,8.188 1.042,0.667 10 false Engine Stop and Start ECU 2.677,2.198 3.146,2.406 0.469,0.208 10 false IGRD 2.688,2.906 3.156,3.115 0.469,0.208 10 false +B 2.667,2.563 3.135,2.771 0.469,0.208 10 false ACCD 2.354,1.635 2.688,1.813 0.333,0.177 10 false 24 5.792,4.604 6.281,4.833 0.49,0.229 10 false A106 1.083,6.563 1.677,6.771 0.594,0.208 10 false A100 3.146,5.219 3.458,5.417 0.313,0.198 10 false 1 2.323,2.198 2.656,2.375 0.333,0.177 10 false A15 2.333,2 2.667,2.177 0.333,0.177 10 false 11 2.313,2.563 2.646,2.74 0.333,0.177 10 false E52 2.344,2.375 2.677,2.552 0.333,0.177 10 false 21 2.313,2.927 2.646,3.104 0.333,0.177 10 false E52 2.375,2.75 2.708,2.927 0.333,0.177 10 false 6 1.375,1.094 1.708,1.271 0.333,0.177 10 false C 1.979,1.115 2.188,1.344 0.208,0.229 10 false E 3.792,5.635 4.125,5.813 0.333,0.177 10 false F 1.688,1.104 1.844,1.302 0.156,0.198 10 false D 2.656,5.313 3.271,5.51 0.615,0.198 10 false DON2 2.75,5.656 3.208,5.854 0.458,0.198 10 false ACC 3.156,5.563 3.313,5.76 0.156,0.198 10 false 3 2.75,6 3.208,6.198 0.458,0.198 10 false BO1 3.156,5.896 3.313,6.094 0.156,0.198 10 false 5 1.563,5.615 2.021,5.813 0.458,0.198 10 false BIN 1.563,6.073 2.021,6.271 0.458,0.198 10 false GND 1.333,5.99 1.49,6.188 0.156,0.198 10 false 6 1.292,5.531 1.604,5.729 0.313,0.198 10 false 11 0.313,6.74 1.229,6.938 0.917,0.198 10 false FL MAIN 1.115,6.708 3.51,7.198 2.396,0.49 10 false External Backup Boost Converter (Eco Run Vehicle Converter Assembly) *1 4.531,5.979 5.656,6.167 1.125,0.188 10 false +B 4.198,6.583 4.656,6.781 0.458,0.198 10 false K2 4.323,6.219 4.667,6.438 0.344,0.219 10 false 16 4.469,6.583 5.917,7.031 1.448,0.448 10 false Stereo Component Amplifier Assembly 4.542,6.302 6.167,6.5 1.625,0.198 10 false +B2 4.385,5.906 4.729,6.125 0.344,0.219 10 false 1 3.229,6.146 4.146,6.344 0.917,0.198 10 false BBC NO.4 0.542,5.76 1.458,5.958 0.917,0.198 10 false BBC NO.3 1.542,8.167 4.688,8.615 3.146,0.448 10 false *1: w/ Stereo Component Amplifier Assembly

A574588E02
5.594,7.01 5.813,7.24 0.219,0.229 10 false 2 5.458,7.208 5.948,7.417 0.49,0.208 10 false A105 5.583,7.635 5.802,7.865 0.219,0.229 10 false 8 5.583,8.323 5.802,8.552 0.219,0.229 10 false 6 5.854,7.823 6.448,8.031 0.594,0.208 10 false GND1 5.854,8.521 6.448,8.729 0.594,0.208 10 false DGND 5.469,0.719 5.979,0.927 0.51,0.208 10 false A104 0.844,8.365 4.198,8.615 3.354,0.25 10 false Inner Rear View Mirror Assembly *3 0.646,1.354 3.427,1.823 2.781,0.469 10 false Tire Pressure Warning ECU and Receiver 0.646,1.188 0.99,1.396 0.344,0.208 10 false K7 2.25,0.74 2.844,0.948 0.594,0.208 10 false IG 2.469,0.635 2.688,0.865 0.219,0.229 10 false 1 5.865,0.719 6.458,0.927 0.594,0.208 10 false IG41 5.583,0.917 5.802,1.146 0.219,0.229 10 false 2 0.594,5.604 0.938,5.813 0.344,0.208 10 false Q1 2.219,5.25 2.813,5.458 0.594,0.208 10 false +B 2.521,5.156 2.781,5.385 0.26,0.229 10 false 6 0.708,8.208 1.052,8.417 0.344,0.208 10 false Q16 0.813,7.052 3.167,7.292 2.354,0.24 10 false Air Conditioning Control Assembly 0.656,6.833 1,7.042 0.344,0.208 10 false E22 2.24,7.958 2.833,8.167 0.594,0.208 10 false IG 2.156,6.75 2.75,6.958 0.594,0.208 10 false IG+ 2.479,7.917 2.75,8.146 0.271,0.229 10 false 4 2.531,6.385 2.75,6.615 0.219,0.229 10 false 8 5.698,9.115 6.99,9.656 1.292,0.542 10 false Engine Stop and Start ECU 0.177,9.104 4.521,9.375 4.344,0.271 10 false *2: w/ Digital Rear-View Mirror System 2.229,1.052 2.823,1.26 0.594,0.208 10 false +B 2.49,0.99 2.708,1.219 0.219,0.229 10 false 7 0.177,9.313 4.229,9.531 4.052,0.219 10 false *3: w/ EC Mirror 5.448,2.604 5.958,2.813 0.51,0.208 10 false A104 5.542,2.406 5.76,2.635 0.219,0.229 10 false 11 5.885,2.615 6.479,2.823 0.594,0.208 10 false B43 0.74,5.823 4.094,6.073 3.354,0.25 10 false Inner Rear View Mirror Assembly *2 2.24,5.531 2.833,5.74 0.594,0.208 10 false IG 2.521,5.427 2.781,5.656 0.26,0.229 10 false 1 2.146,6.479 2.74,6.688 0.594,0.208 10 false ILL+ 2.531,6.646 2.75,6.875 0.219,0.229 10 false 9 5.458,6.5 5.969,6.708 0.51,0.208 10 false A104 5.542,6.313 5.76,6.542 0.219,0.229 10 false 25 5.854,7.198 6.448,7.406 0.594,0.208 10 false GND2 5.865,6.5 6.458,6.708 0.594,0.208 10 false IL41 5.448,7.833 5.938,8.042 0.49,0.208 10 false A105 5.458,8.51 5.948,8.719 0.49,0.208 10 false A106 0.177,8.885 4.229,9.104 4.052,0.219 10 false *1: w/ Headup Display System 5.469,1.083 5.979,1.292 0.51,0.208 10 false A104 5.594,0.531 5.813,0.76 0.219,0.229 10 false 3 5.865,1.094 6.458,1.302 0.594,0.208 10 false B41 0.938,4.51 4.76,4.708 3.823,0.198 10 false Meter Mirror Sub-assembly *1 0.667,4.344 1.281,4.542 0.615,0.198 10 false E160 2.24,4.229 2.552,4.427 0.313,0.198 10 false IG 2.25,3.927 2.406,4.125 0.156,0.198 10 false B 2.5,4.167 2.656,4.365 0.156,0.198 10 false 1 2.49,3.854 2.646,4.052 0.156,0.198 10 false 2 4.188,8.938 4.344,9.135 0.156,0.198 10 false G

A514958E02
2.26,2.865 2.563,3.073 0.302,0.208 10 false 9 2.25,4.385 2.521,4.583 0.271,0.198 10 false 4 2.75,6.917 3.115,7.125 0.365,0.208 10 false 6 5.396,6.906 5.646,7.104 0.25,0.198 10 false 10 2,4.479 2.281,4.667 0.281,0.188 10 false IG 1.917,5.802 2.25,6 0.333,0.198 10 false IGR 2.333,7.115 2.615,7.302 0.281,0.188 10 false IG+ 5.333,4.49 5.958,4.75 0.625,0.26 10 false A104 5.333,7.094 5.844,7.302 0.51,0.208 10 false A104 0.427,3.323 0.708,3.521 0.281,0.198 10 false E60 0.396,4.656 0.677,4.854 0.281,0.198 10 false C37 0.406,6.021 0.688,6.219 0.281,0.198 10 false A40 5.708,8.417 6.979,8.99 1.271,0.573 10 false Engine Stop and Start ECU 0.688,7.51 3.615,7.729 2.927,0.219 10 false Combination Meter Assembly 0.708,6.208 4.583,6.417 3.875,0.208 10 false Brake Actuator Assembly 0.292,4.885 3.771,5.354 3.479,0.469 10 false Power Steering ECU with Motor Assembly 0.927,3.333 2.26,3.552 1.333,0.219 10 false Steering Sensor 5.729,7.104 6.469,7.292 0.74,0.188 10 false IG12 5.76,4.49 6.5,4.677 0.74,0.188 10 false IG31 5.427,4.292 5.646,4.49 0.219,0.198 10 false 23 1.917,2.979 2.375,3.167 0.458,0.188 10 false IG1 2.219,5.729 2.521,5.938 0.302,0.208 10 false 36 2.635,7.104 3.042,7.292 0.406,0.188 10 false E143 3.135,6.917 3.5,7.125 0.365,0.208 10 false 39 3.073,7.104 3.479,7.292 0.406,0.188 10 false E17 3.135,7.333 3.5,7.542 0.365,0.208 10 false *2 2.719,7.323 3.083,7.531 0.365,0.208 10 false *1 0.167,8.406 3.094,8.625 2.927,0.219 10 false *1: for TFT Meter Type 0.167,8.646 3.094,8.865 2.927,0.219 10 false *2: for Optitron Meter Type 0.469,1.125 5.51,1.323 5.042,0.198 10 false Clearance Warning ECU Assembly *3 0.448,0.917 0.906,1.115 0.458,0.198 10 false E51 2.031,0.813 2.344,1.01 0.313,0.198 10 false IG 2.271,0.76 2.427,0.958 0.156,0.198 10 false 1 0.385,2.135 6.042,2.333 5.656,0.198 10 false Millimeter Wave Radar Sensor Assembly 0.438,1.938 0.75,2.135 0.313,0.198 10 false B5 1.927,1.729 2.385,1.927 0.458,0.198 10 false IGB 2.26,1.646 2.417,1.844 0.156,0.198 10 false 8 4.188,0.25 4.344,0.448 0.156,0.198 10 false G 0.167,8.896 5.521,9.094 5.354,0.198 10 false *3: w/ Parking Support Brake System

CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the engine stop and start ECU, read the number of starter operations and write it into a new engine stop and start ECU.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

After replacing the engine stop and start ECU or air conditioning amplifier assembly, reset and perform learning of the air conditioning information in the engine stop and start ECU.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

After replacing the engine stop and start ECU, perform learning of the external backup boost converter (eco run vehicle converter assembly).

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>REGISTRATION

·

Inspect the fuses for circuits related to this system before performing the following procedure.



HINT:
·

DTCs for the stop and start system are not cleared even if the malfunction has been repaired. After repairing the malfunction, be sure to clear the DTCs.

·

Using the GTS, read the Freeze Frame Data before troubleshooting. System condition information is recorded as Freeze Frame Data the moment a DTC is stored. This information can be useful when troubleshooting.

Click hereEngine / Hybrid System>STOP AND START>STOP AND START SYSTEM>FREEZE FRAME DATA



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BBC NO. 1, BBC NO. 2 FUSES)
a.

Disconnect the engine stop and start ECU connector.


b.

Remove the BBC NO. 1 and BBC NO. 2 fuses from the No. 1 engine room relay block and No. 1 junction block assembly


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(A105)Location & Routing

Click Connector(A105)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A105-1 (BIN2) - BBC NO. 2 fuse terminal 2 Always Below 1 Ω
A105-3 (BIN1) - BBC NO. 1 fuse terminal 2 Always Below 1 Ω
A105-1 (BIN2) - Body ground Always 10 kΩ or higher
A105-3 (BIN1) - Body ground Always 10 kΩ or higher
BBC NO. 2 fuse terminal 2 - Body ground Always 10 kΩ or higher
BBC NO. 1 fuse terminal 2 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY)

2.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU POWER SOURCE CIRCUIT)
a.

Disconnect the engine stop and start ECU connectors.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition

Click Location & Routing(A105)Location & Routing

Click Connector(A105)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A105-1 (BIN2) - Body ground Always 9.5 to 14 V
A105-3 (BIN1) - Body ground Always 9.5 to 14 V



c.

Turn the ignition switch to ON.


d.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition

Click Location & Routing(A104)Location & Routing

Click Connector(A104)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A104-18 (IGP) - Body ground Ignition switch ON 9.5 to 14 V



Result:
Proceed to
OK
NG



OK

3.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE STOP AND START ECU - BATTERY OR IGP RELAY)

3.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - BODY GROUND)
a.

Disconnect the engine stop and start ECU connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

Click Location & Routing(A105,A106)Location & Routing

Click Connector(A105)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

Click Connector(A106)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

A105-2 (GND2) - Body ground Always Below 1 Ω
A105-8 (GND1) - Body ground Always Below 1 Ω
A106-6 (DGND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HARNESS AND CONNECTOR (ENGINE STOP AND START ECU - EACH ECU OR SENSOR)
a.

Disconnect the engine stop and start ECU connector.


b.

Disconnect the tire pressure warning ECU and receiver connector.


c.

Disconnect the clearance warning ECU assembly connector. (w/ Parking support brake system)


d.

Disconnect the inner rear view mirror assembly connector.


e.

Disconnect the millimeter wave radar sensor assembly connector.


f.

Disconnect the air conditioning control assembly connector.


g.

Disconnect the meter mirror sub-assembly connector. (w/ Headup Display System)


h.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition

*1: w/ Parking Support Brake System

*2: w/ Digital Rear-View Mirror System

*3: w/ EC Mirror

*4: w/ Headup Display System

Click Location & Routing(A104,K7,E51,Q1,Q16,B5,E22,E160)Location & Routing

Click Connector(A104)Instrument Panel>Engine Room Main Wire>Engine Stop and Start ECU

Click Connector(K7)Body>Floor Wire>Electrical Key and Tire Pressure Monitoring System Receiver Assembly

Click Connector(E51)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Clearance Warning ECU Assembly

Click Connector(Q1)Body>Roof Wire>Inner Rear View Mirror Assembly

Click Connector(Q16)Body>Roof Wire>Inner Rear View Mirror Assembly

Click Connector(B5)Engine Compartment>No. 4 Engine Room Wire / No. 2 Engine Wire / No. 3 Engine Wire / No. 5 Engine Wire / No. 6 Engine Wire / Sensor Wire>Millimeter Wave Radar Sensor Assembly

Click Connector(E22)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Air Conditioning Control Assembly

Click Connector(E160)Instrument Panel>Instrument Panel Wire / Telephone Computer Wire>Meter Mirror Sub-Assembly

A104-3 (IG41) - K7-1 (IG) Always Below 1 Ω
A104-3 (IG41) - E51-1 (IG)*1 Always Below 1 Ω
A104-3 (IG41) - Q1-1 (IG)*2 Always Below 1 Ω
A104-3 (IG41) - Q16-4 (IG)*3 Always Below 1 Ω
A104-3 (IG41) - B5-8 (IGB) Always Below 1 Ω
A104-3 (IG41) - E22-9 (IG+) Always Below 1 Ω
A104-3 (IG41) - E160-1 (IG)*4 Always Below 1 Ω
A104-2 (B41) - K7-7 (+B) Always Below 1 Ω
A104-11 (B43) - Q1-6 (+B)*2 Always Below 1 Ω
A104-11 (B43) - E160-2 (B)*4 Always Below 1 Ω
A104-3 (IG41) - Body ground Always 10 kΩ or higher
A104-2 (B41) - Body ground Always 10 kΩ or higher
A104-11 (B43) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE STOP AND START ECU

Click hereEngine / Hybrid System>STOP AND START>ENGINE STOP AND START ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR