2000 bravada codes

[smeltdan]

have 2000 bravada with 4.3l and had it on machine and came out with codes #1416 and #410, having trouble finding out what they are? Can anyone help?

[atfdmike]

Hope this helps.


An AIR pump is used on this vehicle to lower tail pipe emissions at start-up. The Vehicle Control Module (VCM) supplies a ground to the AIR pump relay, which energizes the AIR pump and the Air Solenoid.

When the AIR pump is enabled, the VCM monitors the HO2S voltage. If the HO2S voltages go below a calibrated threshold value, the VCM interprets this as an indication that the AIR system is operational.

When the AIR pump is disabled, the VCM monitors the HO2S voltages. The HO2S voltages should increase above a calibrated threshold value and switch normally.

If the VCM did not sense more than a predetermined amount of HO2S rich switches, a malfunction will be reported.

The VCM will activate the AIR pump during Closed Loop operation. When the AIR system is activated, the VCM will monitor the HO2S voltages and Short Term Fuel Trim values for both banks of the engine. If the AIR system is operating properly, the HO2S voltages should go low and the short term fuel trim should go high.

The VCM checks that the HO2S voltages return to above a rich threshold when the AIR pump is disabled. If the VCM determines that the HO2S voltages for both banks did not respond as expected during the tests, DTC P0410 will set. If only one sensor responded, the VCM will set either a DTC P1415 or P1416 to indicate on which bank the AIR system is inoperative.



Low AIR system volume may cause a DTC P1415, P1416 or an intermittent complaint. Also check for the following conditions:

• Pinched, kinked or restricted AIR pipes, hoses or fittings
• Leaks, holes, loose fittings or hoses
• Restricted or obstructed AIR pump inlet
• Leaks or restrictions in the vacuum hoses for the AIR shut off valve

An AIR supply hose that is melted before the check valve could indicate exhaust gas back-flow past the check valve.

An intermittent may be caused by any of the following conditions:

• A poor connection
• Rubbed through wire insulation
• A broken wire inside the insulation

Thoroughly inspect any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent and Poor Connections in Diagrams.