Practice question

A school bus Allison transmission will not upshift out of first gear and a shift solenoid circuit DTC is stored. The BEST next diagnostic step is to:

  1. Test the solenoid circuit wiring, connector, and resistance per the service manual
  2. Replace the differential
  3. Replace all four U-joints
  4. Adjust the throttle linkage only

Answer: A — Test the solenoid circuit wiring, connector, and resistance per the service manual

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