The engine stop and start ECU communicates with the SFI system, electronically controlled brake system, power steering system, air conditioning system, airbag system and main body ECU (multiplex network body ECU) via CAN communication.
If there is a communication error between the engine stop and start ECU and any of the systems, the engine stop and start ECU stores DTCs and illuminates the stop and start cancel indicator except when there is a communication error with the meter / gauge system.
When there is an open in the output side of the backup boost converter (built into the engine stop and start ECU), power to the system with the open is cut off. The engine stop and start ECU stores CAN communication DTCs for the system with the open and stop and start system DTC P323A16.
When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in any of the circuits it supplies power to, it shuts off the circuit. The engine stop and start ECU stores CAN communication DTCs for the system which circuit was shut off and stores stop and start system DTC P323A19.
e.g.: When the backup boost converter (built into the engine stop and start ECU) detects overcurrent in the power source circuit of the power steering system and cuts off power supply, the engine stop and start ECU stores DTCs U013187 and P323A19.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory | Note |
|---|---|---|---|---|---|---|
| U010087 | Lost Communication with ECM/PCM "A" Missing Message | No communication between the engine stop and start ECU and ECM for 1 second. | ·
Wire harness or connector ·
Engine stop and start ECU ·
ECM |
Blinks | DTC stored | SAE Code: U0100 |
| U012687 | Lost Communication with Steering Angle Sensor Module Missing Message | No communication between the engine stop and start ECU and steering sensor for 1 second. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Steering sensor |
Blinks | DTC stored | SAE Code: U0126 |
| U012987 | Lost Communication with Brake System Control Module Missing Message | No communication between the engine stop and start ECU and skid control ECU (brake actuator assembly) for 2.22 seconds. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Skid control ECU (Brake actuator assembly) |
Blinks | DTC stored | SAE Code: U0129 |
| U013187 | Lost Communication with Power Steering Control Module Missing Message | No communication between the engine stop and start ECU and the power steering ECU for 1 second. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Power steering ECU |
Blinks | DTC stored | SAE Code: U0131 |
| U014087 | Lost Communication with Body Control Module Missing Message | No communication between the engine stop and start ECU and the main body ECU (multiplex network body ECU) for 3.6 seconds. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Main body ECU (multiplex network body ECU) |
Blinks | DTC stored | SAE Code: U0140 |
| U015187 | Lost Communication with Restraints Control Module Missing Message | No communication between the engine stop and start ECU and airbag sensor with ECU assembly for 10.6 seconds. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Airbag sensor with ECU assembly |
Blinks | DTC stored | SAE Code: U0151 |
| U016487 | Lost Communication with HVAC Control Module Missing Message | No communication between the engine stop and start ECU and air conditioning amplifier assembly for 10.6 seconds. | ·
Wire harness or connector ·
Engine stop and start ECU ·
Air conditioning amplifier assembly |
Blinks | DTC stored | SAE Code: U0164 |
If any of CAN communication system DTCs and sensor malfunction DTCs related to the CAN communication system are output simultaneously, perform troubleshooting for the CAN communication system DTCs first, then for the sensor malfunction DTCs.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Stop and Start / Trouble Codes.
Clear the DTCs.
| Proceed to |
|---|
| NEXT |
NEXT
Turn the ignition switch off and wait for 30 seconds or more.
Start the engine.
Perform a road test.
Enter the following menus: Powertrain / Stop and Start / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTC U010087, U012687, U012987, U013187, U014087, U015187 or U016487 is output | A |
| DTC U010087, U012687, U012987, U013187, U014087, U015187 or U016487 is not output | B |
A
B