Advanced Automotive Fault Diagnosis
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LÔØI NOÙI ÑAÀU, ledklok
| Reactivation procedure
Warning The air bag simulators must be removed and the air bag modules reconnected when reacti- vated to avoid non-deployment in a collision. Failure to follow this instruction may result in personal injury. 1. Disconnect the battery ground cable. 2. Wait one minute for the backup power sup- ply in the Air Bag Control Module to deplete its stored energy. 3. Remove the driver air bag simulator from the sub-harness at the top of the steering column. 4. Reconnect and install the driver air bag module. 5. Remove the passenger air bag simulator from the passenger air bag module harness. 6. Reconnect and install the passenger air bag module. 7. Remove the air bag simulator from the driver five-way under seat connector. 8. Reconnect the driver five-way under seat connector. 9. Remove the air bag simulator from the pas- senger five-way under seat connector. 10. Reconnect the passenger five-way under seat connector. 11. Reconnect the battery ground cable. 12. Prove out the system, repeat the self test and clear the fault codes. Note: This section is included as general guidance; however, do not assume it is relevant to all vehicles. Electrical systems 245 246 Advanced automotive fault diagnosis Knowledge check questions To use these questions, you should first try to answer them without help but if necessary, refer back to the content of the chapter. Use notes, lists and sketches to answer them. It is not necessary to write pages and pages of text! 1. Explain what is meant by ‘controller area network (CAN)’ and why it is used to connect ECUs or nodes together. 2. List in a logical sequence, a series of steps to diagnose why a wiper motor operates on slow speed but not on fast speed. 3. Describe how to check that an on/off relay is operating correctly. 4. Describe how to test the output of a road speed sensor used as part of a cruise control system. 5. Make a sketch of a fuel gauge circuit and describe how to check it for correct operation. |