2001 V70XC HAVE DTC1603 Topic is solved

[SPIKE]

NEED INFO ON THIS CODE SHOPKE (UP TO DATE ) HAS NOTHING ON DTC FOR VOLVO

[Batstar]

Volvo conversion for 1603 is ECM-91A7 signifying a internal fault with the throttle unit.

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

* 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).