Checking Lock-Up Function

Fig 1: Engine Start Verification

Courtesy of VOLVO CARS CORPORATION

• Engine running
• Car raised so that the driven wheels hang freely
• Move the gear selector to position D
• Read the transmission input speed, the engine speed (RPM), the status of the lock-up function and the position of the accelerator pedal (AP).

  Depress the accelerator pedal (AP) and check the lock-up function by comparing the input speed of the transmission and the engine speed (RPM). The transmission and the engine speed (RPM) must be approximately the same. The lock-up function is not functioning if the difference is greater than 100 rpm.

  Fig 2: Identifying VCT2000 Diagnostic Tool Symbol In VIDA

  Courtesy of VOLVO CARS CORPORATION

Is the difference in speed (RPM) greater than 100 rpm? 

• YES 

  Refer to REPLACING A FAULTY TRANSMISSION 

• NO 

  Refer to CHECKING RESISTANCE, SOLENOID SL