Faulty Signal

ECM-91A7 THROTTLE UNIT, INTERNAL FAULT
FAULTY SIGNAL

Checking other diagnostic trouble codes (DTCs)
If any of diagnostic trouble codes (DTCs) ECM-914F, ECM-9150, ECM-9160 or ECM-91B7 are stored in the engine control module (ECM), these must be remedied and fault-traced first.

Remedy as necessary.

Is diagnostic trouble code (DTC) ECM-914F, ECM-9150, ECM-9160 or ECM-91B7 stored in the engine control module (ECM)?
Yes - Testing Complete.
No - Continue below.


Checking the electronic throttle module (ETM) and software



Check battery and charging system. This diagnostic trouble code (DTC) may be stored before the battery voltage becomes too low.

Check the electronic throttle module (ETM) connector. Check for contact resistance and oxidation.

Thoroughly check the throttle for dirt and sticking. Check that no objects are blocking the throttle. Check for dirt and sticking visually by pressing the throttle disc to change the angle.

Hint: Small objects can cause the throttle disc to jam momentarily, this can cause the diagnostic trouble code (DTC).

Note! A film of oil covering the throttle may be an indication that the nipple between the intake manifold and the flame trap needs to be cleaned. Always clean the nipple if the throttle is covered in a film of oil.

Read off the software number in the electronic throttle module (ETM) by clicking the VCT2000 symbol. Always check that the software number corresponds to the latest VOLVO software. See the service information for information about the latest software.

Hint: The diagnostic trouble code (DTC) may be the result of a faulty electronic throttle module (ETM). If the diagnostic trouble code (DTC) persists, despite the above checks and remedies, try a new electronic throttle module (ETM).

Caution! A new throttle unit is delivered without software. For the throttle unit to function after replacement, it must be programmed.

Other information:
- To fault-trace the battery, Fault-Tracing and Testing the Battery
- Select the software manager to download the software
- See other service information for the relevant action code
- To access or replace the electronic throttle module (ETM), Throttle Body (Electronic Throttle Module), Replacing
- Checking wiring and terminals, [1][2]Checking Wiring and Terminals