Manual

Compressed Air Air Fuel Ratio Module Installation and User Guide
CHAPTER 2
Air Pump Maintenance and Troubleshooting
2-8
PUMP MAINTENANCE—STAND ALONE
To ensure accurate readings, pump maintenance should be performed every six
months, or sooner, depending on usage. Periodically check the air flow and adjust as
necessary to maintain 35 L/min for each sample tube. If you are unable to adjust the
air flow to 35 L/min, clean the pump. Use a solvent to clean all pump pieces very
carefully.
1 Remove the ball valve or solenoid (for pumps using the control pod).
2 Loosen the lock nut.
3 Remove the vacuum generator exhaust port.
4 Remove the venturi body.
5 Remove the sensor(s) from the sensor block.
6 Remove the two screws securing the sensor block to the toggle clamp.
7 Use a solvent to carefully clean the vacuum generator exhaust port, venturi body,
and sensor block.
Note: Be careful not to damage the internal structure of the venturi body.
8 Install the sensor block using the two screws removed earlier.
9 Install the venturi body, vacuum generator exhaust port, and ball valve or
solenoid.
10 Install the sensor(s).
11 Replace the silicon and copper tubing if necessary.
12 Re-calibrate the pump using the flow meter. Refer to page 1-12 for more
information.
Figure 2-6: Pump Maintenance—Stand Alone Pump
lock nut
vacuum generator
exhaust port
solenoid
venturi body
sensor block
toggle clamp
silicon tube
copper sample
tube
sensor