AIR pump trouble codes

Technical - Water in AIR Pump and/or DTC P0410, P0412, P0415, P0416, P0100,
P0101, P0102 or DTC 48 (AIR System Disable Procedure) #01-06-04-011


Water in AIR Pump and/or DTC P0410, P0412, P0415, P0416, P0100, P0101, P0102 or
DTC 48 (AIR System Disable Procedure)
1995-1996 Buick Roadmaster
1995-1996 Cadillac Fleetwood
1995-1996 Chevrolet Caprice, Impala SS
with 4.3L or 5.7L Engine (VINs W, P -- RPOs L99, LT1)
Condition

• Some customers may comment of a hesitation during heavy/full throttle acceleration.
  
• A 1996 vehicle may also set any of the following DTCs:
  
  
  
  • P0410
    
  • P0412
    
  • P1415
    
  • P1416
    
  • P0100
    
  • P0101
    
  • P0102
    
  
  </li>
  
• A 1995 vehicle may set a DTC 48.
  
• There will also be evidence of water in the AIR pump.
  

Cause


Under high engine speed and load conditions, hot exhaust gasses may leak past
the air check valves. As the exhaust gasses in the air tube cool, water vapors
collect into the AIR pump. As the vehicle is driven, condensation from the AIR
pump may come into contact with the Mass Airflow Sensor through the AIR inlet
hose. This condition may cause a hesitation on acceleration and may also set
the DTCs.
Correction


To correct this condition, a Secondary AIR Injection Pump disable procedure
has been developed. (It has been determined that the Secondary AIR Injection
system is not required to meet emission requirements for these vehicles only.)

1. Locate the relay center (1) and air cleaner box (2).
   
   
2. Remove the AIR hose and clamp (1) from the air cleaner box.
   
3. Insert the plug (2) into the air cleaner box AIR hose inlet (3).
   
4. Install the AIR hose and clamp (1) to the air cleaner box.
   
   
5. Remove the cover (1) from the relay center (3).
   
6. Remove AIR pump relay (2) from the relay center (3).
   
7. Install the relay cover (1).
   
   
8. Install new emission label to radiator support (3).
   
9. Update vehicle calibration. (1995 4.3 L L99 Caprice, and 1996 vehicles)
   

Parts Information


Part Number Description Qty

12569122	AIR Inlet Hose Plug	1
12569123	New Emission Label	1

Parts are currently available from GMSPO.
Calibration Information


The Calibrations are electronic calibrations and are NOT available from GMSPO.
Calibrations will be available from Techline starting February 2001, on the
TIS 2000 version TIS 2.0/2001 data update or later.
Warranty Information


For vehicles repaired under warranty, use:
Labor Operation Description Labor Time

J6930	AIR Disable Procedure	0.2 hr.
This is a unique labor operation number for use only with this bulletin. This number will not be published in the Labor Time Guide.

1995 4.3 L (RPO L99) Caprice and 1996 vehicles should also use this add time
for reprogramming:
Labor Operation Description Labor Time

J6355	Powertrain Controller -- Reprogram -- On Car	Use Published Labor Times

Copyright General Motors Corporation. All Rights Reserved.

I believe the AIR pump check valves are pretty cheap; if your pump still works, you might just be better off replacing them on a semi-regular basis as a preventative measure.