Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-91B7

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) registers that the movements of the throttle is impeded, or that the return spring in the throttle unit is not functioning correctly, when attempting to adapt the electronic throttle unit.

Substitute value
Depending on the fault, the engine control module (ECM) can cut off the supply to the damper motor in the electronic throttle unit. The throttle will then attempt to set itself to the return position.

Possible source

Faulty signal
- The throttle is sticking or is blocked (oil film, dust etc.)
- Contact resistance or oxidation in the terminals between the engine control module (ECM) and the electronic throttle unit
- Open-circuit, short-circuit to ground or short-circuit to supply voltage in the wiring for the damper motor in the throttle unit
- Short-circuit to each other in the wiring for the damper motor in the throttle unit
- Damaged throttle unit.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Poor performance.