Diagnostic Trouble Code (DTC) Information

ECM-91A7 THROTTLE UNIT, INTERNAL FAULT
DIAGNOSTIC TROUBLE CODE (DTC) INFORMATION




Condition
Diagnostic trouble code (DTC) ECM-91A7 is stored if the engine control module (ECM) registers an internal or external fault.

Substitute value
- the accelerator pedal (AP) 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
- throttle unit in mechanical limp home mode, the throttle disc in fixed position (only 5 cylinder engines with DENSO electronics).

Possible source
- something is blocking the throttle position sensor (an oil film, dust etc.)
- poorly charged battery or corroded in the connecting cables
- the power supply to the throttle unit
- old software in the throttle unit
- defective throttle unit.

Fault symptom[s]
- the accelerator pedal (AP) is ignored when braking
- the cruise control cannot be activated
- uneven idle
- jerks during engine braking
- very poor throttle response (only 5 cylinder engines with DENSO electronics)
- maximum speed approximately 50 km/h (only 5 cylinder engines with DENSO electronics)
- the ETS warning lamp lights (C70 and S/V70 -2000 only).