A4 Quattro Sedan V6-2.8L (ACK) (1997)
Fuel Injector: Testing and Inspection
Electrical Checks
WARNING: Fire hazard! Do not smoke, work near heaters or open flame, or have anything in the area that could ignite fuel.
CHECKING ELECTRICAL RESISTANCE
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Disconnect harness connector from fuel injector to be tested.
Fuel Injector Testing
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Measure resistance of fuel injector.
Specification:
Bosch:
15.0-17.0 ohms
Siemens:
13.5-14.5 ohms
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Replace any fuel injector for which resistance measurement does not fall within specified value.
CHECKING VOLTAGE SUPPLY
REQUIREMENTS
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Fuel pump relay OK.
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Activation of fuel pump relay OK.
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Fuse for fuel injectors OK.
PROCEDURE
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Disconnect harness connector from fuel injector to be tested.
2-Pin Connector
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Connect VAG 1527B voltage tester between harness connector terminal 1 and Ground (GND).
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Use scan tool "Output Diagnostic Test Mode" function 03 to trigger fuel pump relay -J17-.
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Specified Value: Voltage tester must light up.
If the LED does not light up:
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Check wiring between terminal 1 and fuel injector fuse using wiring diagram.
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Repair if necessary.
If the LED lights up:
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Check fuel injector triggering.
CHECKING FUEL INJECTOR TRIGGERING