Lexus NX: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
*: Use the Techstream.
PROCEDURE
| 1. | VEHICLE BROUGHT TO WORKSHOP |
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| 2. | CUSTOMER PROBLEM ANALYSIS |
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| 3. | CONNECT TECHSTREAM TO DLC3* |
HINT:
If the display indicates a communication malfunction, inspect the DLC3.
When any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first.
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| 4. | CHECK DTC AND FREEZE FRAME DATA* |
(a) Check for DTCs.
Click here .gif)
(b) Check for freeze frame data.
Click here
HINT:
Record or print DTCs and freeze frame data if necessary.
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| 5. | CLEAR DTC AND FREEZE FRAME DATA* |
(a) Clear the DTCs and freeze frame data.
Click here
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| 6. | CONDUCT VISUAL INSPECTION |
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| 7. | SELECT CHECK MODE DIAGNOSIS* |
(a) Switch the ECM from normal mode to check mode.
Powertrain > Engine and ECT > Utility| Tester Display |
|---|
| Check Mode |
HINT:
Refer to Check Mode Procedure.
Click here
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| 8. | CONFIRM PROBLEM SYMPTOMS |
(a) Confirm problem symptoms.
HINT:
If the engine does not start, first perform the "Check DTC" procedure and "Conduct Basic Inspection" procedure below.
| Result | Proceed to |
|---|---|
| Malfunction does not occur | A |
| Malfunction occurs | B |
| B | .gif) | GO TO STEP 10 |
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| 9. | SIMULATE SYMPTOMS |
HINT:
Refer to Symptom Simulation.
Click here
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| 10. | CHECK DTC* |
(a) Check for DTCs.
Powertrain > Engine and ECT > Trouble CodesHINT:
Refer to DTC Check / Clear.
Click here
| Result | Proceed to |
|---|---|
| DTCs are output | A |
| DTCs are not output | B |
| B | | GO TO STEP 12 |
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| 11. | REFER TO DTC CHART |
HINT:
Refer to Diagnostic Trouble Code Chart.
Click here
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| 12. | CONDUCT BASIC INSPECTION |
(a) Conduct basic inspection.
HINT:
Refer to Basic Inspection.
Click here
| Result | Proceed to |
|---|---|
| Malfunctioning parts not confirmed | A |
| Malfunctioning parts confirmed | B |
| B | | GO TO STEP 17 |
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| 13. | REFER TO PROBLEM SYMPTOMS TABLE |
HINT:
Refer to Problem Symptoms Table.
Click here
| Result | Proceed to |
|---|---|
| Malfunctioning circuit confirmed | A |
| Malfunctioning parts confirmed | B |
| B | | GO TO STEP 17 |
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| 14. | CHECK ECM POWER SOURCE CIRCUIT |
(a) Check the ECM power source circuit.
HINT:
Refer to ECM Power Source Circuit.
Click here
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| 15. | CONDUCT CIRCUIT INSPECTION |
| Result | Proceed to |
|---|---|
| Malfunction not confirmed | A |
| Malfunction confirmed | B |
| B | | GO TO STEP 18 |
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| 16. | CHECK FOR INTERMITTENT PROBLEMS |
(a) Check for intermittent problems.
HINT:
Refer to Check for Intermittent Problems.
Click here
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| 17. | CONDUCT PARTS INSPECTION |
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| 18. | IDENTIFY PROBLEM |
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| 19. | ADJUST AND/OR REPAIR |
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| 20. | CONDUCT CONFIRMATION TEST |
| NEXT | | END |
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