STOP AND START SYSTEM, Diagnostic DTC:U0100,U0121,U0131,U0151,U0155 and U0164
| DTC Code | DTC Name |
|---|---|
| U0100 | Lost Communication with ECM / PCM "A" |
| U0121 | Lost Communication with Anti-lock Brake System (ABS) Control Module |
| U0131 | Lost Communication with Power Steering Control Module |
| U0151 | Lost Communication with SRS Airbag ECU |
| U0155 | Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) |
| U0164 | Lost Communication with HVAC Control Module |
DESCRIPTION
The engine stop and start ECU communicates with the SFI system, anti-lock brake system, power steering system, meter/gauge system, air conditioning system and airbag system 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 light 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 P323B.
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 B22C0.
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 the power supply, the engine stop and start ECU stores DTCs U0131 and B22C0.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Memory |
|---|---|---|---|---|---|
U0100 |
Lost Communication with ECM / PCM "A" |
No communication between the engine stop and start ECU and ECM for 0.9 seconds. |
|
Blinks |
DTC stored |
U0121 |
Lost Communication with Anti-lock Brake System (ABS) Control Module |
No communication between the engine stop and start ECU and skid control ECU (brake actuator assembly) for 2.2 seconds. |
|
Blinks |
DTC stored |
U0131 |
Lost Communication with Power Steering Control Module |
No communication between the engine stop and start ECU and power steering ECU assembly for 0.8 seconds. |
|
Blinks |
DTC stored |
U0151 |
Lost Communication with SRS Airbag ECU |
No communication between the engine stop and start ECU and airbag sensor assembly for 10.6 seconds. |
|
Blinks |
DTC stored |
U0155 |
Lost Communication with Instrument Panel Cluster Control Module (Combination Meter) |
No communication between the engine stop and start ECU and combination meter assembly for 3.6 seconds. |
|
Does not come on |
DTC stored |
U0164 |
Lost Communication with HVAC Control Module |
No communication between the engine stop and start ECU and air conditioning control assembly for 10.6 seconds. |
|
Blinks |
DTC stored |
CAUTION / NOTICE / HINT
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.
PROCEDURE
CLEAR DTC
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.
Powertrain > Stop and Start > Clear DTCs
Result
Proceed to
NEXT
CHECK DTC OUTPUT
Turn the ignition switch off and wait for 30 seconds or more.
Turn the ignition switch to ON.
Start the engine.
Perform a road test.
Enter the following menus: Powertrain / Stop and Start / Trouble Codes.
Read the DTCs.
Powertrain > Stop and Start > Trouble Codes
Result
Result
Proceed to
DTC U0100, U0131, U0140, U0151, U0155 or U0164 is output
A
DTC U0100, U0131, U0140, U0151, U0155 or U0164 is not output
B