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 MANUALSSUZUKI2009EQUATOR SPORT, 4D PICKUP, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROL SYSTEM (VQ40DE) - (4 OF 5)DTC U0101: CAN COMM CIRCUITON BOARD DIAGNOSIS LOGIC

2009 Suzuki Equator Sport, 4D Pickup, RWD

On Board Diagnosis Logic

2009 Suzuki Equator Sport, 4D Pickup, RWDSECTION On Board Diagnosis Logic

DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U0101⁽¹⁾
0101⁽¹⁾

Lost communication with TCM

When ECM is not transmitting or receiving CAN communication signal of OBD (emission-related diagnosis) with TCM for 2 seconds or more.

CAN communication line between TCM and ECM
CAN communication line is open or shorted

⁽¹⁾	This self-diagnosis has the one trip detection logic (A/T)

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.