GM Service Manual Online
For 1990-2009 cars only

Strategy Based Diagnostics

Review the system operations in order to familiarize yourself with the system functions. Refer to Transmission System Description and Operation .

The mechanical diagnostic tables used in this section are to diagnose the components for shifting and operating the transmission. For the internal mechanical diagnostic and the repair of the specific transmission, refer to the transmission manufacturer manuals. The Eaton Fuller transmission service manual information is available by calling Eaton Fuller at 800-826-4357 or from the Eaton Fuller website http://truck.eaton.com/na/service_products/.

Visual/Physical Inspection

    • Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
    • Inspect the manual transmission for the correct fluid level.
    • Inspect the manual transmission for fluid leaks.
    • Inspect the manual transmission for broken or loosen transmission mounts.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

    •  Transmission Shifts Hard
    •  Transmission Gear Clash When Shifting Gears
    •  Transmission Noisy
    •  Transmission Does Not Shift into One Gear
    •  Transmission Locked in One Gear
    •  Transmission Jumps Out of Gear
    •  Transmission Clunk on Acceleration or Deceleration