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.
Fault Conditions
The control modules communicate with each other in a network via a standardized serial communication method - CAN (Controller Area Network). The ECM has registered a fault in the communication on the CAN network. The CAN signal from the throttle unit is missing or not updated. DTC ECM-902A is stored in the ECM.
No substitute values are used. The following actions are taken:
- The accelerator pedal is ignored when braking
- The cruise control cannot be activated
- The engine speed (RPM) is limited using fuel shut off. The maximum permitted engine speed depends on the accelerator pedal (AP) position
- The throttle unit follows the Pulse Width Modulation (PWM) accelerator pedal signal directly, the control signal via CAN is ignored.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.