Functional Test Procedure

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Step	Action	Yes	No
The Functional Test Procedure is the first step in diagnosing mechanical or hydraulic transmission conditions. The Functional Test Procedure provides procedures and references to the symptom diagnosis table for specific diagnostic information.
1	IMPORTANT: Engine performance can strongly affect transmission performance. Ensure the condition is not the result of poor engine performance before continuing. Verify the customer concern.Has the customer concern been verified?	Go to Step 2	-
2	IMPORTANT: Many transmissions have default actions that take place once a DTC fault is detected. These actions may appear to be transmission concerns. Perform the Diagnostic System Check - Vehicle .Did you perform the Diagnostic System Check - Vehicle?	Go to Step 3	Go to Diagnostic System Check - Vehicle
3	Inspect for the following conditions: Vehicle damage Transmission oil pan damage Refer to Oil Pan Replacement . Transmission range selector cable damaged or out of adjustment Refer to Automatic Transmission Range Selector Cable Adjustment or Automatic Transmission Range Selector Cable Replacement . Inspect for loose, worn, damaged or missing: Mounts or struts Brackets Mounting hardware Refer to Transmission Replacement (With 6.6L Engine)Transmission Replacement (With 8.1L (L18) Engine) . Transmission cooler or cooler line restrictions Refer to Automatic Transmission Oil Cooler Flushing and Flow Test . Fluid leaks Refer to Fluid Leak Diagnosis . Did you find a condition?	Go to the appropriate repair or diagnosis section	Go to Step 4
4	Perform the Transmission Fluid Checking Procedure . Did you perform the Transmission Fluid Checking Procedure ?	Go to Step 5	Go to Transmission Fluid Checking Procedure
5	Perform the Road Test Procedure . Did the vehicle exhibit any objectionable performance condition?	Go to Step 6	Go to Step 1
6	Did the vehicle exhibit objectionable torque converter operation?	Go to Step 15	Go to Step 7
7	Did the vehicle produce any objectionable noise condition?	Go to Symptoms - Automatic Transmission	Go to Step 8
8	Did the vehicle exhibit a vibration condition?	Go to Step 9	Go to Step 10
9	Did the vibration occur only during torque converter clutch (TCC) apply or release?	Go to Step 15	Go to Symptoms - Automatic Transmission
10	Did the vehicle exhibit a shift speed condition, such as low or high shift speeds?	Go to Symptoms - Automatic Transmission	Go to Step 11
11	Inspect for the following unacceptable shift qualities: Harsh, soft, delayed or no engagement Harsh, soft or delayed shifts Shift shudder, flare or tie-up Did the vehicle exhibit any of these shift quality conditions?	Go to Step 12	Go to Step 13
12	Perform the Line Pressure Check Procedure . Is the line pressure within specification?	Go to Symptoms - Automatic Transmission	Go to Symptoms - Automatic Transmission
13	Inspect for the following unacceptable shift pattern conditions: No upshift or downshift Only one or two forward ranges No first range, second range, third range, fourth range or fifth range Slipping Non first range start Did the vehicle exhibit any of these shift pattern conditions?	Go to Symptoms - Automatic Transmission	Go to Step 14
14	Inspect for the following unacceptable range performance conditions: No PARK, REVERSE or DRIVE No engine braking No gear selection Incorrect gear selection Did the vehicle exhibit any of these range performance conditions?	Go to Symptoms - Automatic Transmission	System OK
15	Inspect for the following specific torque converter or TCC malfunctions? Stuck ON or OFF Early or late engagement Incorrect apply or release Soft or harsh apply Clunk or shudder No torque multiplication Excessive slip Poor acceleration Engine stalls Did the vehicle exhibit any of these torque converter or TCC conditions?	Go to Torque Converter Diagnosis Procedure	System OK