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EMISSION CONTROL - V8 DESCRIPTION AND OPERATION 17-2-47 The following table shows the components itemised on the above illustration and the test applicable to each Test 1– Secondary Air Injection (SAI) Pump Check all wiring and connections. Functional Check of SAI Pump The ECM checks the engine coolant temperature when the engine is started in addition to checking the elapsed time ° C (131 ° F) and the ambient temperature above 8 ° C (46 ° F) for the SAI pump to run. Also, depending on the long term 'modelled' ambient temperature determined by the ECM, the minimum time elapsed required since the last engine start can be up to 8.25 hours. The ° C (46 ° F) to 30 seconds for a start at 55 ° C (131 ° F). With a warm engine which is switched off and the SAI pump relay removed, the SAI pump can be supplied with power CAUTION: Ensure that terminals 87 and 87a are not connected or bridged in any way, a short circuit will NOTE: TestBook/T4 can also be used to force the SAI system to perform an SAI active diagnostic routine. During this When the terminals are bridged or the diagnostic routine initiated, the pump must run when requested which will be If the SAI pump does not run or makes a scraping noise, it must be replaced. In this case, all other system components Noise Complaints If the SAI pump runs but the operating noise is excessively loud, the external components of the pump, cable, hose If excessive noise still occurs, the SAI pump must be replaced. NOTE: Before a new SAI pump is fitted, the SAI control valves must checked for correct function and tightness – Refer When fitting a new SAI pump, ensure that the hose lines, the cable and the decoupling segments are fitted without Item No. Component Description Applicable Test 1 SAI Pump Test 1 – Secondary Air Injection (SAI) Pump 2 SAI control valves (1 per engine bank) Test 2 – Secondary Air Injection (SAI) Control Valves 3 Vacuum solenoid valve Test 3 – Vacuum Solenoid Valve 4 Delivery hoses to SAI control valves Test 4 – Delivery Hoses to Secondary air Injection (SAI) Control Valves 5 Connection to air manifold (SAI rail) Test 5 – Connection to Air Manifold 6 Vacuum line (intake manifold to vacuum solenoid valve) Test 6 – Vacuum Lines 7 Vacuum lines (vacuum solenoid valve to SAI control valves) Test 6 – Vacuum Lines |