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I know on an OBD1 system you can remove the pump and as long as there is a good fuse, there will be no SES light.
So on an OBD2 system can you do the same thing? Its an 96 Impala SS. Or do you have to tune it out of the computer? Im thinking you have to tune it out because Im assuming that the O2's will be looking for that extra oxygen when the pump is running, and if its not there it will set the SES light.
Can anyone confirm or deny this?
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94 Z28 stock motor, LS brakes all around, stock suspension(except for panhard bar and drag springs), stock rear 2.73's, 141k, k&n, pacesetter shorties, 3" maganaflow catback, vented opti cap, level 1 4l60e, protorque 2500 stall, bolt-ons, lightly portmatched, 1.6 GMPP Rollers, stock tune.
ODB2 checks the O2's... During the AIR test, the PCM activates the AIR pump during closed loop operation. When the AIR is activated, the PCM monitors the HO2S voltages, and monitors the short-term fuel trim values for both banks of the engine. If the AIR system is operating correctly, the HO2S voltages should be low, and the short-term fuel trim should be high.
Lights up MIL indicator (emission failure), stores DTC P0410, can be tuned out..
The GM online diagnostic guides for the 97 F-Body indicate that the P0410 diagnostic in that year was run in both open loop and closed loop. In open loop (passive test), the PCM is looking for a lean (<400mV) reading from the O2 sensors; then in open loop (active test) air pump is turned on and the PCM looks for O2 sensor readings <222mV or a fuel integrator change of at least 14 counts.
Look up the 96 B-Body to see what the system uses:
94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400+GearVendors OD/4.11's / Strange 12-bolt / 300-shot N2O / Spohn Suspension / 6-pt roll bar with integrated SFC's / full AutoMeter instrumentation / MoTeC M48 Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.