Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. With the scan tool, read Transmission Control Module (TCM) DTCs and record on the repair order.
2. Record the Event Data and Environmental Data.
3. With the scan tool, erase DTCs.
4. 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.
5. With the scan tool, read TCM DTCs.
  Did the DTC return?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK (F893) 5 VOLT SUPPLY CIRCUIT OPERATION
1. Turn the ignition off.
2. Disconnect the Transmission Assembly harness connector.
3. Turn the ignition on.
4. Measure the voltage on the (F893) 5 Volt Supply circuit.
  Is the voltage between 4.8 and 5.2 volts?
  
  Yes
  - Go To 5
  No
  - Go To 3
CHECK (F893) 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND OR A SHORT TO ANOTHER CIRCUIT
1. Turn the ignition off.
2. Disconnect the TCM harness connector.
3. Check for continuity between ground and the (F893) 5 Volt Supply circuit at the TCM harness connector.
4. Check for continuity between the (F893) 5 Volt Supply circuit and all other circuits at the TCM harness connector.
  Is there continuity between the (F893) 5 Volt Supply circuit and ground or another circuit in the TCM harness connector?
  
  Yes
  - Repair the (F893) 5 Volt Supply circuit for a short to ground or a short to another circuit in the TCM harness.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 4
CHECK (F893) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN
1. Measure the resistance of the (F893) 5 Volt Supply circuit between the TCM harness connector and the Transmission Assembly harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (F893) 5 Volt Supply circuit for an open.
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
CHECK THE TRANSMISSION INTERNAL WIRE HARNESS (F893) 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Measure the resistance between the (F893) 5 Volt Supply circuit in the Transmission Internal Wire Harness connector and ground.
  Is there continuity between the (F893) 5 Volt Supply circuit and ground?
  
  Yes
  - Replace the Transmission Internal Wire Harness in accordance with the Service Information. Refer to HARNESS, INTERNAL WIRE, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  No
  - Go To 6
CHECK THE TRANSMISSION INTERNAL WIRE HARNESS (F893) 5 VOLT SUPPLY CIRCUIT FOR A SHORT TO ANOTHER CIRCUIT
1. Remove the Transmission Side Cover in accordance with the Service Information and disconnect the Transmission Oil Pressure Sensor harness connector.
2. Measure the resistance between the (F893) 5 Volt Supply circuit and all other circuits on the Transmission Internal Wire Harness connector.
  Is there continuity between the (F893) 5 Volt Supply circuit and another circuit in the Transmission Internal Wire Harness?
  
  Yes
  - Replace the Transmission Internal Wire Harness in accordance with the Service Information. Refer to HARNESS, INTERNAL WIRE, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  No
  - Go to 7.
CHECK THE TRANSMISSION INTERNAL WIRE HARNESS (F893) 5 VOLT SUPPLY CIRCUIT FOR AN OPEN CIRCUIT
1. Measure the resistance of the (F893) 5 Volt Supply circuit between the Transmission Internal Wire Harness connector and the Transmission Range Sensor harness.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
  - Test Complete.
  No
  - Replace the Transmission Range Sensor/Internal Wire Harness in accordance with the Service Information. Refer to HARNESS, INTERNAL WIRE, REMOVAL AND INSTALLATION .
  - Perform the TRANSMISSION VERIFICATION TEST. Refer to 948TE-9HP48 TRANSMISSION VERIFICATION TEST .
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all PCM 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.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all PCM 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. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair the poor connections as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .