Checking The Component And Wiring

Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.

Check the signal ground cable between engine control module (ECM) terminal #A24 (#A24) and throttle unit terminal #3 (wiring side). Check for an open-circuit. Check for a short-circuit to supply voltage.

Check the power supply cable (5 V) between engine control module (ECM) terminal #A15 (#A15) and throttle unit terminal #5 (cable harness side). Check for a short-circuit to battery voltage.

HINT: With the ignition on, the power supply to the throttle unit position sensor must be approximately 5 V measured between throttle unit connector terminals #3 and #5 (wiring side). 

Check the signal cable (position sensor 1) between engine control module (ECM) terminal #A96 (#B36) and throttle unit terminal #6 (wiring side). Check for a short-circuit to supply voltage.

Check the signal cable (position sensor 2) between engine control module (ECM) terminal #A72 (#B12) and throttle unit terminal #4 (cable harness side). Check for a short-circuit to supply voltage.

If no faults are found and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit.

Remedy as necessary.

Other information 

• see CONNECTING THE BREAKOUT BOX
• see SIGNAL SPECIFICATION
• see THROTTLE BODY
• see CHECKING WIRING AND TERMINALS

Fig 2: Identifying 6-Bit Connector

Courtesy of VOLVO CARS CORPORATION

Fig 3: Identifying Ohm Meter

Courtesy of VOLVO CARS CORPORATION

Fig 4: Identifying Electronic Throttle Unit

Courtesy of VOLVO CARS CORPORATION

Refer to VERIFICATION