Diagnostic Test

Check If Transmission Control Module (TCM) Software Update Is Available
1. With The Scan Tool, Check If A TCM Software Update Is Available.
  Is An Update Available?
  
  Yes
  - Go To 2
  No
  - Go To 3
Program The TCM
1. Perform The TCM Programming Procedure. Refer To MODULE PROGRAMMING .
2. Perform The Transmission Verification Test. Refer To TRANSMISSION VERIFICATION TEST - 948TE 9HP48 .
  Were You Able To Successfully Program The TCM And Pass The Transmission Verification Test?
  
  Yes
  - Test Complete.
  No
  - Go To 3
Check Related Harness Connections
1. Disconnect All TCM Harness Connectors.
2. Disconnect All Related In-Line Harness Connections (If Equipped).
3. Disconnect The Related Component Harness Connectors.
4. Inspect Harness Connectors, Component Connectors, And All Male And Female Terminals For The Following Conditions:
  - Proper Connector Installation.
  - Damaged Connector Locks.
  - Corrosion.
  - Other Signs Of Water Intrusion.
  - Weather Seal Damage (If Equipped).
  - Bent Terminals.
  - Overheating Due To A Poor Connection (Terminal May Be Discolored Due To Excessive Current Draw).
  - Terminals That Have Been Pushed Back Into The Connector Cavity.
  - Perform A Terminal Drag Test On Each Connector Terminal To Verify Proper Terminal Tension.
  Repair Any Conditions That Are Found.
5. Reconnect All TCM Harness Connectors. Be Certain That All Harness Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
6. Reconnect All In-Line Harness Connectors (If Equipped). Be Certain That All Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
7. Reconnect All Related Component Harness Connectors. Be Certain That All Connectors Are Fully Seated And The Connector Locks Are Fully Engaged.
8. With The Scan Tool, Erase Dtcs.
9. Using The Recorded Event And Environmental Data, Along With The When Monitored And Set Conditions Above, Operate The Vehicle In The Conditions That Set The DTC.
10. With The Scan Tool, Read TCM Dtcs And Record On The Repair Order.
  Did The DTC Return?
  
  Yes
  - Replace The TCM In Accordance With The Service Information. Refer To Module, Transmission Control (TCM), Removal And Installation .
  - Perform The Transmission Verification Test. Refer To TRANSMISSION VERIFICATION TEST - 948TE 9HP48 .
  No
  - Perform The Transmission Verification Test. Refer To TRANSMISSION VERIFICATION TEST - 948TE 9HP48 .
  - Test Complete.