A6 Quattro Sedan V6-2.8L (AHA) (1998)
Fuel Pump Relay: Testing and Inspection
Fuel pump relay and connections, checking
NOTE:
-
Voltage to the fuel pump and certain injection components is supplied through the fuel pump relay -J17-.
-
The fuel pump relay -J17- is activated only with the engine running. The relay receives a ground through the Engine Control Module (ECM) after
the ECM detects an RPM signal.
Required special tools and test equipment
-
VAG 1551 or VAG 1552 Scan Tool (ST) with VAG 1551/3 adapter cable
-
VAG 1598/22 test box
-
Multimeter US 1119 (Fluke 83 or equivalent)
-
VW 1594 connector test kit
-
Wiring diagram
Testing requirements
-
Battery voltage - minimum 11 volts
Checking function of fuel pump relay -J17-
-
Initiate output Diagnostic Test Mode (DTM) and advance to test of cylinder 1 fuel injector -N30-.Refer to "Scan Tool Testing/Output Diagnostic
Test Mode (DTM) (Function 03)" See: Computers and Control Systems/Testing and Inspection
NOTE: This step lets the fuel pump run without the engine running. The closed throttle position switch must be closed during the test, or the selected
fuel injector will be activated 5 times discharging fuel.
The fuel pump relay (on relay panel position 4) must engage.
-
If relay doesn't engage, check actuation of fuel pump relay.
-
If fuel pump doesn't run, check actuation of fuel pump and components.
Actuation of fuel pump relay, checking
-
Switch ignition off.
-
Connect VAG 1598/22 test box to ECM harness connector.Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Computers and Control Systems/Testing and Inspection
-
Using test leads from VAG 1594, connect test box sockets 2 and 4.
-
Switch ignition on
The fuel pump relay must engage.
If the relay engages now, but didn't during the output Diagnostic Test Mode (DTM):
-
Replace ECM.
-
Carry out adaptation of throttle valve control module to ECM.
-
Check readiness code.If Diagnostic Trouble Code (DTC) memory has been erased, or ECM was disconnected, generate new readiness code.
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Computers and Control Systems/Testing and
Inspection
Refer to "Moniters, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code See: Computers and Control Systems/Testing and
Inspection