Table of Contents
10.14 Replacing the pump
10.15 Checking the pressure sensor
10.16 Checking the response time of
the pressure sensor
78
i Please also refer to Sections 12.1 and 12.5 dealing with the electrical wiring and
hosing for the EAM exhaust-gas analyzer module.
1.
Remove the 2-core line leading from the pump to the control module PCB.
2.
Remove the hose lines from the pump heads.
3.
Using a diagonal cutter, cut the cable binder (on the fastening clip) and remove.
4.
Pull the pump out of the fastening clip.
5.
Press the new pump into the fastening clip.
6.
Insert the 2-core line leading from the pump in the control module PCB.
7.
Push the hose lines onto the hose connectors of the pump as shown in the gas circuit
diagram (Sec. 12.5) and fasten with hose clips.
8.
Perform a leak test (Sec. 4.2) and function test (Sec. 10.13).
! As from FD 07.2004 pumps of a shorter design (1 687 222 167) will be installed. In
order to fasten these in place, angle bracket 1 681 332 269 also has to be fitted. For
mounting details see the Installation instructions 1 689 978 483.
1.
Start the leakage test (Sec. 4.2)
using the Service software.
If a leak test can now be performed
and it is passed, the pressure sensor
is deemed to be in order.
If a leakage test cannot be perfor-
med, a message appears prompting
you to remove the seal.
In this case, check the voltage supply
to the pressure sensor (Secs. 10.2
and 10.3).
If the voltage supply is in order, the
pressure sensor must be replaced
(Sec. 10.17).
1.
Using the Service software, start the
Read measurement values menu.
2.
Following zero calibration and the
HC residues test, seal off the test-gas
inlet.
3.
After 5 - 7 seconds, the message In-
sufficient flow should be displayed.
If the above message is not displayed,
you must perform a leak test (Sec. 4.2).
If the leak test is failed, check that the
hosing conforms to the gas circuit
diagram (Sec. 12.2).
If the hosing is in order, replace the
pressure sensor (10.17).
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