For 1990-2009 cars

#### 4L60-E Transmission Functional Test

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Perform Transmission Fluid Check .
2. Fill the reservoir to the suggested level.

Is the fluid level correct?

--

Go to Step 2

--

2 | Check for PCM trouble codes, both current and history. Are PCM trouble codes present? | -- | Go to Diagnostic Trouble Code Identification | Go to Step 3
3 |

1. Perform Electrical/Garage Shift Procedure .
2. Perform Road Test .

Was the condition duplicated?

--

Go to Step 4

Go to Step 12

4 | Is a harsh or soft shift condition present | -- | Go to Step 7 | Go to Step 5
5 | Is the vehicle's performance poor? | -- | Go to Torque Converter Clutch (TCC) Diagnosis | Go to Step 6
6 | Is the engagement into Drive or Reverse delayed or missing? | -- | Go to Step 7 | Go to Step 9
7 | Perform Line Pressure Check . Is the line pressure correct? | -- | Go to Step 8 | Refer to Symptom Diagnosis Charts
8 | Inspect the transmission wire harness connectors and the transmission range switch. Was the problem found and corrected? | -- | System OK | Refer to Symptom Diagnosis Charts
9 | Is vibration or noise a problem? | -- | Refer to Flexplate/Torque Converter Vibration Test | Go to Step 10
10 | Is the fluid leaking? | -- | Refer to Fluid Leak Diagnosis and Repair | Go to Step 11
11 | Are other transmission conditions present? | -- | Refer to Symptom Diagnosis Charts | Go to Step 12
12 | The condition is intermittent. Re-examine the complaint. | -- | Exit Table | --