Scheme 1
Scheme 2
Test Description
The numbers below refer to the step numbers in the diagnostic table.
- 1: When the ECM stores a DTC U0101, a DTC U2105 simultaneously sets in the TCM. Performing the diagnostic procedures in DTC U2105 will repair DTC U0101.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Use the scan tool in order to clear the DTCs. Turn OFF the ignition for 30 seconds. Start the engine. Use the scan tool and check for DTCs. Is DTC U0101 present? | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 2 |
| 2 | Does the scan tool communicate with the engine control module (ECM) and transmission control module (TCM)? | Go to Diagnostic System Check - Vehicle | Go to Scan Tool Does Not Communicate with CAN Device |
The numbers below refer to the step numbers on the diagnostic table.
- 1: Fuse F11 supplies power to terminal 16 of the DLC.
- 4: The battery positive voltage and ground circuits of the DLC are functioning properly. The malfunction must be due to the scan tool.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Test the battery positive voltage circuit of the data link connector (DLC) for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 2 |
| 2 | Test the ground circuit or the DLC for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 3 |
| 3 | Inspect for poor connections at the DLC ground terminals and the DLC power terminals at the DLC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
| 4 | The scan tool may be malfunctioning. Refer to the scan tool user guide. Did you obtain a properly operating scan tool? | Go to Step 5 | |
| 5 | Does the scan tool power up? | Go to Diagnostic System Check - Vehicle | Go to Step 1 |
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step checks whether the scan tool can communicate with other control modules on the vehicle. If the scan tool can communicate with one of the other modules then the DLC connector, the shared circuits, and the scan tool are OK.
- 4: This step checks whether the ECM is receiving ignition positive voltage from the fuse F16 when the ignition is ON. The ECM cannot provide serial data without ignition positive voltage.
- 7: This step checks for a high resistance or an open/short in the ECM serial data circuit.
- 8: This step checks the ECM DLC Diagnostic circuit high resistance or open/short. This could cause the ECM not to communicate.
- 9: This step checks to see if the EBCM is not communicating with the scan tool.
- 14: This step checks to see if the SIR system is not communicating with the scan tool.
- 19: This step checks to see if the theft deterrent-immobilizer system is not communicating with the scan tool.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Have you performed the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Does the scan tool power up? | Go to Step 3 | Go to Scan Tool Does Not Power Up |
| 3 | Does the scan tool communicate with the engine control module (ECM)? | Go to Step 9 | Go to Step 4 |
| 4 | With the ignition OFF: Disconnect the ECM connector. Turn ON the ignition. Test the ECM battery positive (B+) and/or ignition voltage circuits with a test lamp connected to ground. Does the test lamp illuminate for all circuits? | Go to Step 5 | Go to Step 24 |
| 5 | With the ECM still disconnected, test the ECM ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all ground circuits? | Go to Step 6 | Go to Step 24 |
| 6 | Reconnect the ECM connector. Connect the scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool display serial data? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 7 |
| 7 | Test the serial data circuit for an open, high resistance, or a short circuit. Refer to Circuit Testing . Did you find and correct the condition? | Go to Step 29 | Go to Step 8 |
| 8 | Test the data link connector (DLC) diagnostic circuit for an open, high resistance or a short circuit. Refer to Circuit Testing . Did you find and correct the condition? | Go to Step 29 | Go to Step 25 |
| 9 | Does the scan tool communicate with the electronic brake control module (EBCM)? | Go to Step 14 | Go to Step 10 |
| 10 | Test the EBCM battery positive (B+) and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits? | Go to Step 11 | Go to Step 24 |
| 11 | Test the EBCM ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits? | Go to Step 12 | Go to Step 24 |
| 12 | Test the EBCM serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition? | Go to Step 29 | Go to Step 13 |
| 13 | Inspect the EBCM connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition? | Go to Step 29 | Go to Step 26 |
| 14 | Does the scan tool communicate with the SIR module? | Go to Step 19 | Go to Step 15 |
| 15 | Test the SIR module battery positive (B+) and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits? | Go to Step 19 | Go to Step 24 |
| 16 | Test the SIR module ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits? | Go to Step 17 | Go to Step 24 |
| 17 | Test the SIR serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition? | Go to Step 29 | Go to Step 18 |
| 18 | Inspect the SIR module connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition? | Go to Step 29 | Go to Step 27 |
| 19 | Does the scan tool communicate with the theft deterrent module? | Go to Step 29 | Go to Step 20 |
| 20 | Test the theft deterrent module battery positive voltage B+ and/or ignition voltage circuits with a test lamp to ground. Does the test lamp illuminate for all circuits? | Go to Step 21 | Go to Step 24 |
| 21 | Test the theft deterrent module ground circuits with a test lamp connected to B+. Does the test lamp illuminate for all circuits? | Go to Step 22 | Go to Step 24 |
| 22 | Test the theft deterrent serial data circuit for an open, high resistance, or short circuit. Refer to Circuit Testing . Did you find and correct the condition? | Go to Step 29 | Go to Step 23 |
| 23 | Inspect the theft deterrent module connectors. Refer to Wiring Repairs or Connector Repairs . Did you find and correct the condition? | Go to Step 29 | Go to Step 28 |
| 24 | Repair the circuit as necessary. Refer to Wiring Repairs or Connector Repairs . Is the action complete? | Go to Step 29 | |
| 25 | Replace the ECM. Is the action complete? | Go to Step 29 | |
| 26 | Replace the EBCM. Refer to Brake Modulator Assembly Replacement . Is the action complete? | Go to Step 29 | |
| 27 | Replace the SIR module. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement . Is the action complete? | Go to Step 29 | |
| 28 | Replace the theft deterrent module. Is the action complete? | Go to Step 29 | |
| 29 | Operate the system in order to verify the repair. Is the action complete? | System OK | Go to Step 3 |