Page 1095 - Workshop Manual - Tunland (2017)
P. 1095

DIAGNOSTICS - ENGINE CONTROL SYSTEM                          04-409

                 EXCESSIVE NOISE OF VACUUM PUMP                                                                      04


                      Fault phenomenon                  Diagnosis logic                Possible reasons
                                                  • Vacuum system                 • Vacuum system fault
                  Excessive noise of vacuum       • Vacuum pump                   • Vacuum pump fault
                  pump
                                                  • Camshaft                      • Camshaft fault


                 Diagnosis Procedure

                 1 .    Check the engine data
                 (a)    Ignition switch: OFF.
                 (b)    Connect the diagnosis tool with the fault diagnosis connector (16 pins) on the lower
                        left of the dashboard.
                 (c)    Ignition switch: ON, and start the diagnostic tool.
                 (d)    Read the motor data shown on the diagnostic tool.

                 Check whether the data flow is normal or not.
                 YES>To step 2.

                 No >Maintenance related faults.

                 2 .    Check vacuum pump
                 (a)    Check whether vacuum pump is damaged or not.

                 Is the inspection result normal?
                 YES>To step 3.
                 NO>Replace the vacuum pump.


                 3 .    Check vacuum system
                 (a)    Check whether the vacuum system leaks.
                 (b)    Check whether the vacuum pipeline has phenomenon of aging, cracking and so on.
                 Is the inspection result normal?

                 YES>To step 4.
                 No >Maintenance related faults.

                 4 .    Check the camshaft.

                 (a)    Check whether the assembly technique between the camshaft and the vacuum pump
                        is accord with standard.

                 Is the inspection result normal?

                 YES>Complete the diagnosis and the system is confirmed to be normal.
                 No >Maintenance related faults.
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