Checking the generator (GEN) and battery

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Ignition off
• Connect the breakout box to the central electronic module (CEM)
• Start the engine.

  Check the 30-supply to central electronic module (CEM) terminal #3E (breakout box terminal #B23) and terminal #6E (breakout box terminal #B26). The voltage must not exceed 15 volts at 2,000 RPM.

  Also check that the battery is not over-charging.

  Remedy as necessary.

  Other information: 

  • To access the central electronic module (CEM), see Central electronic module (CEM), replacing
  • To connect the breakout box, see Connecting the breakout box
  • The generator (GEN) connector for gasoline engines, see Generator, replacement
  • The generator (GEN) connector for diesel engines, see Generator (GEN), replacing .

Was the function OK? 

• YES 

  Refer to Verification 

• NO 

  Refer to Replacing the charge regulator