Testing

Carbon Monoxide Content: Testing — 1994 Audi S4 Service Manual & Component Testing >> Idle Control Systems >> Carbon Monoxide Content >> Testing Carbon Monoxide Content: Testing NOTE: DO NOT take measurements while radiator cooling fan is operating. NOTE: If the adapter has been used for fuel system testing, DO NOT use it for emission sampling. Residual fuel traces will make CO/HC readings inaccurate. Connect (VAG 1363) CO tester to CO tap tube, near Heated Oxygen Sensor (H02S), using adapter (VAG 1363/3). See Fig 1. Start engine and let idle. CO content must be 0.5-0.9 percent. See IDLE SPEED & CO LEVEL table. NOTE: Failure of one spark plug increases CO content significantly. If NO: Ensure that all spark plugs are operating properly. If spark plugs are Okay, but CO is still NOT to specification, perform the following steps: Read DTC memory again. Initiate Output Diagnostic Test Mode (DTM). See OUTPUT DIAGNOSTIC TEST MODE in SELF-DIAGNOSTICS. Check engine Basic Setting values in display channel 3 (display field, oxygen sensor). Make the necessary repairs. Fig 1: Connecting Carbon monoxide Tester To CO. Tap Tube (Port) [IMAGE: http://127.0.0.1:8080/images25/G00177375/] Courtesy of AUDI OF AMERICA, INC. IDLE SPEED & CO LEVEL Application Idle RPM CO Level 2.22L Turbo Man. Trans. (1) 770-830 0.5-0.9% (1) Trans. in Neutral. Radiator cooling fan clutch not engage.