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4 Diagnosis and Testing
⇒ “4.1 Fuel and Residual Pressure before High Pressure Pump,
Checking”, page 21
⇒ “4.2 Wiring and Components, Checking with Test Box VAG
1598/42”, page 24
4.1 Fuel and Residual Pressure before High
Pressure Pump, Checking
Special tools and workshop equipment required
♦ Pressure gauge K-Jetronic -V.A.G 1318-
♦ Pressure gauge adapter -V.A.G 1318/10-12-
♦ Remote control -V.A.G 1348/3A- with adapter cable -V.A.G
1348/3-3-
♦ Measuring container, fuel-resistant
Test Conditions
• Battery voltage at least 12.5 V.
• Fuel filter OK.
•
Fuel tank at least
1
/
4
filled.
• Fuel Pump (FP) control module -J538- OK; checking ⇒ Fuel
Supply System; Rep. Gr. 20 ; Diagnosis and Testing .
• Ignition switched off.
Checking Fuel Pressure
With Front Wheel Drive
– Fold forward right backrest of rear seat, if necessary.
– Remove luggage compartment floor trim.
– Remove cover for locking flange -arrows-.
– Carefully release and disconnect electrical harness connector
-arrow- at locking flange.
With All Wheel Drive
– Remove rear seat bench ⇒ Body Interior; Rep. Gr. 72 ; Re‐
moval and Installation
Audi A6 2005 ➤
Fuel Injection and Ignition - Edition 03.2008
4. Diagnosis and Testing 21
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