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-73 is stored if the control module detects that the signal from the throttle position (TP) sensor is too high or too low.

Substitute Value

Limited DSA function
Initial boost pressure
No fuel trim adaptation
Limited EVAP control
The mass air flow (MAF) sensor signal is used to determine the throttle angle.

Possible Source

Signal too high:

Short-circuit to supply voltage in the signal cable
Open-circuit in the ground lead
Contact resistance in the terminals
Defective throttle position (TP) sensor.

Signal too low:

Short-circuit to ground in the signal cable
Open-circuit in the signal cable
Open-circuit in the power cable
Contact resistance in the terminals
Defective throttle position (TP) sensor.

Fault symptom[s]

Transmission slap when applying / lifting off the throttle
Poor performance
Deteriorated DSA function
The DSA warning lamp lights
Idle speed too high
Idle speed too low.