Pump Delivery Test (Max) In Conjunction With Speed And Pressure Test (Delivery Module With Cooling Circuit Control Valve, Metering Module Without Fixed Restrictor) - Bosch Denoxtronic-Set 2 Handbuch

10.2.1 Pump delivery test (max) in conjunction with speed and pressure test
(delivery module with cooling circuit control valve, metering module
without fixed restrictor)
It is important to clearly identify the delivery module version fitted in the vehicle. This can be
seen from the software Identification in the diagnostic tester (Section 1.5.2).
Always heed the vehicle and system-specific information on ESI[tronic].
Attention:
Always drain the system before opening the AdBlue circuit to avoid the uncontrolled
escape of AdBlue. This test always ends with termination of diagnosis. For further
testing, the ignition is therefore to be switched off and on again.
1 - AdBlue tank
2 - Delivery module with control unit
3 - Test metering module (with return restrictor)
4 - Cooling circuit control valve
5 - Pressure gauge
6 - Test pressure pipe Y-hose
7 - Connecting line (adapter)
- Connect up the diagnostic tester/adapter
module (Section 8).
- Prepare the test metering module (Section 9)
and also connect the pressure gauge (0 986 610
510) with the test pressure pipe Y-hose (0 986
610 523) to the inlet pipe.
- Attach the test metering module to the
graduated beaker (0.5 l) so as to permit
metering into the graduated beaker.
- If not yet done, connect the return of the test
metering module with the test pressure pipe (0 986 610 453) to the return pipe of the delivery
module/tank.
- Remove the return pipe of the metering module and the return pipe to the AdBlue tank from
the delivery module and jump both pipes with the adapter lead (0 986 610 294).
Note: In contrast to the metering module fitted, the test metering module is provided with a fixed
restrictor. The cooling circuit control valve in the return therefore has to be bypassed by way of
the adapter.
- If the test is not completed, check the connections, switch the ignition off and on again and re-
start the test.
- Compare the delivery, speed and pressure values to the set values.
Possible causes of trouble if the delivery rate is not attained: AdBlue tank empty, pre-
filter / main filter clogged, intake pipes crushed. To check, draw in AdBlue from a
separate vessel if applicable. If the speed level of the pump is in excess of 2500 min-1
and / or the pressure is less than 485 kPa (4.85 bar), the pump may be defective or
worn. Replace the delivery module or have it checked and if necessary repaired.
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