Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2012CT 200H L4-1.8L (2ZR-FXE) HYBRIDREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSTRANSMISSION CONTROL ECU COMMUNICATION STOP MODE
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) Hybrid
Transmission Control ECU Communication Stop Mode
2012 Lexus CT 200h L4-1.8L (2ZR-FXE) HybridSECTION Transmission Control ECU Communication Stop Mode
NETWORKING: CAN COMMUNICATION SYSTEM: Transmission Control ECU Communication Stop Mode
- Transmission Control ECU Communication Stop Mode
DESCRIPTION
The transmission control ECU drives the parking lock actuator in accordance with signals from the power management control ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
* Turn the power switch off before inspecting CAN bus lines for a ground short.
* After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.
HINT
* Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
* Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
1. CHECK CAN BUS LINE FOR DISCONNECTION (TRANSMISSION CONTROL ECU ASSEMBLY BRANCH LINE)
(a) Turn the power switch off.
(b) Disconnect the transmission control ECU assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (TRANSMISSION CONTROL ECU ASSEMBLY)
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
(a) Disconnect the transmission control ECU assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- REPLACE TRANSMISSION CONTROL ECU ASSEMBLY Removal
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.