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DTC Troubleshooting

TEST PROCEDURE - CAN RECEIVE ECM MESSAGE FAILURE

Step Action Value(s) Yes No
1 Perform an On-Board Diagnostic (OBD II) System Check.
Is the check completed?		 - Go to Step 2 Go to ON-BOARD DIAGNOSTIC (OBD II) SYSTEM CHECK .
2
  1. Turn the ignition OFF.
  2. Disconnect the TCM wiring connector and ECM wiring connector.
  3. Measure the resistance between terminal A8 of the TCM wiring connector and terminal K77 of the ECM wiring connector.
  4. Measure the resistance between terminal A16 of the TCM wiring connector and terminal K78 of the ECM wiring connector.

Is the resistance within the values shown?		 ≈ 0 Ω Go to Step 4 Go to Step 3
3 Repair the malfunctioning terminals as necessary.
Is the action complete?		 - System OK -
4
  1. Turn the ignition ON.
  2. Measure the voltage of terminal A8.
  3. Measure the voltage of terminal A16.

Is the voltage within the values shown?		 11 - 14 V Go to Step 5 Go to Step 6
5 Repair the short to power on the terminal(s) as necessary.
Is the action complete?		 - System OK -
6
  1. Replace the TCM.
  2. Turn the ignition OFF and turn the ignition ON.
  3. Check if U0100 DTC is set.

Is The DTC set?		 - Go to Step 7 Go to Step 8
7
  1. Replace the ECM.
  2. Is the action complete?
 - Go to Step 8 -
8
  1. After the repair, use a scan tool "clear info" function and road test the vehicle.
  2. Review the "DTC info".

Has the last test failed or is the current DTC displayed?		 - Begin diagnosis again. Repair verified exit DTC chart.
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