Tandem Pump, Checking

Tandem pump, checking
Special tools, testers and auxiliary items required





^ Pressure tester VAS 5187





^ Torque wrench (5 ... 50 Nm) V.A.G. 1331
^ Vehicle diagnosis, Testing and Information System VAS 5051

Requirements
- Coolant temperature must be at least 85 ' C.
- Unit injectors OK

Work sequence





- Remove plug - arrow -.
- Connect pressure tester VAS 5187 as shown.
- Start engine and run at idling speed.





- Connect Vehicle diagnosis, Testing and Information System VAS 5051 and select operating mode "Vehicle self diagnosis". Then select engine control module with Address word "01 " .
- Press diagnosis function "08-Read measured value block" .
- Enter display group "2" using number block and confirm entry with Q key.
- Read engine idling speed in display zone 1.
- Increase engine speed to 1500 rpm.
- Observe pressure indicated on pressure gauge. Specification- min. 3.5 bar
- Press (arrow) key.
- Press function "06-End output" .
- Switch off ignition.
If the specification is not obtained
- Replace tandem pump

Note: After removing pressure tester, tighten plug to 25 Nm. Always replace seal.