Diagnostic trouble code (DTC) information

Condition 

Fig 1: Removing Throttle Position (TP) Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

Diagnostic trouble code (DTC) ECM-74 is stored if the control module detects that the signal from the throttle position (TP) sensor is too low at high load and high engine speed (RPM).

Substitute Value 

The fuel injection system diagnostics are disabled.

Possible Source 

• Contact resistance in the terminals
• Defective throttle position (TP) sensor.

Fault symptom[s] 

• Transmission slap when applying / lifting off the throttle
• Limited DSA function.