| 1. | Turn the ignition switch OFF, and wait 1 minute. |
| 2. | Disconnect ECM connector No. 2 (58P). |
| 3. | Disconnect the HDS from the DLC. |
| 4. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 90-111 W? YES - Go to 35. NO - Go to 5. |
| 5. | Disconnect the gauge control module (tach) 36P connector. |
| 6. | Disconnect the VSA modulator-control unit 46P connector, and the yaw rate/lateral acceleration sensor 4P connector.n |
| 7. | Disconnect SRS unit connector A (28P). |
| 8. | Disconnect EPS control unit connector D (28P). |
| 9. | Check for continuity between ECM connector No. 2 terminals No. 47 and No. 48.
Is there continuity? YES - Repair short in the wire between ECM connector No. 2 terminals No. 47 and No. 48*.n NO - Go to 10. |
| 10. | Connect ECM connector No.2 terminal No. 47 to body ground with a jumper wire.
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| 11. | Check for continuity between gauge control module (tach) 36P connector terminal No. 1 and body ground.
Is there continuity? YES - Go to 12. NO - Repair open in the wire between the gauge control module (tach) and ECM connector No. 2 terminal No. 47.n |
| 12. | Check for continuity between VSA modulator-control unit 46P connector terminal No. 39 and body ground.
Is there continuity? YES - Go to 13. NO - Repair open in the wire between the VSA modulator-control unit and ECM connector No. 2 terminal No. 47.n |
| 13. | Check for continuity between SRS unit connector A (28P) terminal No. 11 and body ground.
Is there continuity? YES - Go to 14. NO - Repair open in the wire between the SRS unit and ECM connector No. 2 terminal No. 47.n |
| 14. | Check for continuity between EPS control unit connector D (28P) terminal No. 1 and body ground.
Is there continuity? YES - Go to 15. NO - Repair open in the wire between the EPS control unit and ECM connector No. 2 terminal No. 47.n |
| 15. | Remove the jumper wire from ECM connector No. 2 (58P). |
| 16. | Connect ECM connector No. 2 terminal No. 48 to body ground with a jumper wire.
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| 17. | Check for continuity between gauge control module (tach) 36P connector terminal No. 19 and body ground.
Is there continuity? YES - Go to 18. NO - Repair open in the wire between the gauge control module (tach) and ECM connector No. 2 terminal No. 48.n |
| 18. | Check for continuity between VSA modulator-control unit 46P connector terminal No. 38 and body ground.
Is there continuity? YES - Go to 19. NO - Repair open in the wire between VSA modulator-control unit and ECM connector No. 2 terminal No. 48.n |
| 19. | Check for continuity between SRS unit connector A (28P) terminal No. 12 and body ground.
Is there continuity? YES - Go to 20. NO - Repair open in the wire between the SRS unit and ECM connector No. 2 terminal No. 48.n |
| 20. | Check for continuity between EPS control unit connector D (28P) terminal No. 15 and body ground.
Is there continuity? YES - Go to 21. NO - Repair open in the wire between the EPS control unit and ECM connector No. 2 terminal No. 48.n |
| 21. | Reconnect the gauge control module (tachometer) 36P connector. |
| 22. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 108-132 W? YES - Go to 23. NO - Substitute a known-good gauge control module (tach). If the HDS communicate with the ECM, replace the original gauge control module (tach).n |
| 23. | Disconnect the gauge control module (tach) 36P connector. |
| 24. | Reconnect the VSA modulator-control unit 46P connector. |
| 25. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 2.34-2.86 KW? YES - Go to 26. NO - Substitute a known-good VSA modulator-control unit. If the HDS communicate with the ECM, replace the original VSA modulator-control unit.n |
| 26. | Disconnect the VSA modulator-control unit 46P connector. |
| 27. | Reconnect the yaw rate/ lateral acceleration sensor 4P connector. |
| 28. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 2.34-2.86 KW? YES - Go to 29. NO - Substitute a known-good yaw rate/lateral acceleration sensor. If the HDS communicate with the ECM, replace the original yaw rate/lateral acceleration sensor.n |
| 29. | Disconnect the yaw rate/ lateral acceleration sensor 4P connector. |
| 30. | Reconnect SRS unit connector A (28P). |
| 31. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 2.34-2.86 KW? YES - Go to 32. NO - Substitute a known-good SRS unit. If the HDS communicate with the ECM, replace the original SRS unit.n |
| 32. | Disconnect SRS unit connector A (28P). |
| 33. | Reconnect EPS control unit connector D (28P). |
| 34. | Measure resistance between ECM connector No. 2 terminals No. 47 and No. 48.
Is there about 2.34-2.86 KW? YES - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.n NO - Substitute a known-good EPS control unit. If the HDS communicate with the ECM, replace the original EPS control unit.n |
| 35. | Disconnect the gauge control module (tach) 36P connector. |
| 36. | Disconnect the VSA modulator-control unit 46P connector, and the yaw rate/ lateral acceleration sensor 4P connector. |
| 37. | Disconnect SRS unit connector A (28P). |
| 38. | Disconnect EPS control unit connector D (28P). |
| 39. | Check for continuity between ECM connector No.2 terminal No. 47 and body ground.
Is there continuity? YES - Repair short in the wire between ECM connector No. 2 terminal No. 47 and the gauge control module (tach), the VSA modulator-control unit, the yaw rate/ lateral acceleration sensor, the SRS unit, the EPS control unit, or the DLC.n NO - Go to 40. |
| 40. | Check for continuity between ECM connector No.2 terminal No. 48 and body ground.
Is there continuity? YES - Repair short in the wire between ECM connector No. 2 terminal No. 48 and the gauge control module (tach), the VSA modulator-control unit, the yaw rate/ lateral acceleration sensor, the SRS unit, the EPS control unit, or the DLC.n NO - Go to 41. |
| 41. | Reconnect all connectors. |
| 42. | Connect the HDS to the DLC. |
| 43. | Disconnect the gauge control module (tach) 36P connector. |
| 44. | Turn the ignition switch ON (II), and turn on the HDS. Does the HDS identify the vehicle? YES - Replace the gauge control module (tach).n NO - Go to 45. |
| 45. | Turn the ignition switch OFF. |
| 46. | Reconnect the gauge control module (tach) 36P connector. |
| 47. | Disconnect the VSA modulator-control unit 46P connector. |
| 48. | Turn the ignition switch ON (II), and turn on the HDS. Does the HDS identify the vehicle? YES - Replace the VSA modulator-control unit.n NO - Go to 49. |
| 49. | Turn the ignition switch OFF. |
| 50. | Reconnect the VSA modulator-control unit 46P connector. |
| 51. | Disconnect the yaw rate/ lateral acceleration sensor 4P connector. |
| 52. | Turn the ignition switch ON (II), and turn on the HDS. Does the HDS identify the vehicle? YES - Replace the yaw rate/lateral acceleration sensor.n NO - Go to 53. |
| 53. | Turn the ignition switch OFF. |
| 54. | Reconnect the VSA modulator-control unit 46P connector and the yaw rate/ lateral acceleration sensor 4P connector. |
| 55. | Disconnect SRS unit connector A (28P). |
| 56. | Turn the ignition switch ON (II), and turn on the HDS. Does the HDS identify the vehicle? YES - Replace the SRS unit.n NO - Go to 57. |
| 57. | Turn the ignition switch OFF. |
| 58. | Reconnect SRS unit connector A (28P). |
| 59. | Disconnect EPS control unit connector D (28P). |
| 60. | Turn the ignition switch ON (II), and turn on the HDS. Does the HDS identify the vehicle? YES - Replace the EPS control unit.n NO - Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM.n |