With Manufacturer's Scan Tool
Injectors, Checking
Special tools and equipment
- V.A.G1551 scan tool or
- V.A.G1552 mobile scan tool with
- V.A.G1551/3B cable V.A.G1598/31 test box
- V.A.G1526 or Fluke multimeter
- V.A.G1527 voltage tester
- V.A.G1594 adapter set
- Wiring diagram
Check conditions
- Engine speed sensor must be OK, checking. Testing and Inspection
- Fuel pump relay must be OK
- All fuses must be OK.
Test sequence
- First check activation of injectors via Output Diagnostic Test Mode.
If one or more injectors do not click:
Checking resistance of injectors
- Check resistance of injectors between contacts.
Specification: 12 to 17 Ohms
NOTE: The resistance figures are valid for approx. 20 degrees C. At higher temperatures the resistance figures will increase.
If the specification is not attained:
- Replace faulty injector
Pay attention to the following when installing the injectors:
- Replace O-rings on all injectors and lightly moisten with clean engine oil.
- Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.
- Set fuel distributor with secured injectors on cylinder head and press in evenly.
- The connectors must audibly engage in the injectors when pushed on.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory.
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes
Checking voltage supply
- Disconnect connectors from injectors.
- Connect voltage tester to contact 1 and Ground (GND) of relevant injector connector.
- Operate starter and check voltage supply for injector.
LED must light up
If the LED does not light up:
- Switch ignition off.
- Check wire between 2-pin connector contact 1 and fuel pump (FP) relay -J17- for open circuit using wiring diagram.
Wire resistance: max. 1.5 Ohms
Checking activation and voltage supply
- Disconnect connectors from injectors.
- Connect V.A.G1527 voltage tester to connector contacts of injector to be tested using adapter cables from V.A.G1594.
- Operate starter and check activation for injector.
LED must flicker
If the LED does not flicker:
- Switch ignition off.
- Connect V.A.G1598/31 test box to control module wiring harness. Engine control module remains disconnected.
- Check wiring between the test box and connector for open circuit, short circuit to Ground (GND) or positive using wiring diagram:
Injector 1: contact 2 + socket 96
Injector 2: contact 2 + socket 89
Injector 3: contact 2 + socket 97
Injector 4: contact 2 + socket 88
Wire resistance: max. 1.5 Ohms
If no malfunction can be found in the wiring:
- Replace engine control module.
Check injectors for leaks and quantity injected
Special tools and equipment
V.A.G1348/3 Remote control
V.A.G1348/3-2 Adapter
V.A.G1602 Calibration tester
Test conditions
- The fuel pressure must be in order. Testing and Inspection
WARNING: Fuel system is under pressure! Before opening the system remove fuse 28 and place a cloth around the connection. Then release pressure by carefully loosening the connection.
Test sequence
- Disconnect connectors from injectors.
- Remove fuel rail complete.
- Pull vacuum hose off fuel pressure regulator.
- Lift fuel rail with injectors off intake manifold and support it.
Checking for leaks
- Initiate Output Diagnostic Test Mode; fuel pump must run.
NOTE:
- This step serves only to run the fuel pump when the engine is stopped.
- During the Output Diagnostic Test Mode, the injectors are activated. Before initiate the Output Diagnostic Test Mode, you must disconnect the injector connectors.
- Check injector for leaks (visual check). Only 1 to 2 drops per minute must emit from each valve when fuel pump is running.
If the fuel loss is greater:
- Switch ignition off.
- Replace faulty injector.
Pay attention to the following when installing the injectors:
- Replace O-rings on all injectors and lightly moisten with clean engine oil.
- Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.
- Set fuel distributor with secured injectors on cylinder head and press in evenly.
- The connectors must audibly engage in the injectors when pushed on.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory.
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes
Checking injected quantity
- Connect V.A.G1598/31 test box to control module wiring harness. The engine control module remains disconnected.
- Switch ignition on.
- Bridge sockets 2 + 65 of test box with adapter cables from V.A.G1594. Fuel pump must start.
NOTE: This work sequence allows the fuel pump to run when the engine is not running.
- Insert injector to be checked in a measuring glass of tester for injected quantity V.A.G1602.
- Connect one contact of injector to be tested to engine Ground (GND) using auxiliary cables from V.A.G1594.
- Connect second injector contact with auxiliary cable to V.A.G1348/3 remote control using V.A.G1348/3-2 adapter cable.
- Connect alligator clip to battery (+).
- Operate V.A.G1348/3 remote control for 30 seconds.
- Repeat check on other injectors using new measuring beakers.
- After all injectors have been activated, place measuring glasses on a horizontal surface and compare injected quantity.
Specification: 133 to 157 ml per injector
NOTE: If the measured values of one or more injectors are above or below the prescribed specifications:
- Replace faulty injector.
Perform installation of injectors in reverse order. When doing this note the following:
- Replace O-rings on all injectors and lightly moisten with clean engine oil.
- Insert injectors vertically and in the correct position into the fuel rail and secure with retaining clips.
- Install fuel rail with secured injectors onto intake manifold and press in evenly.
- Check DTC Memory, if necessary, repair any malfunctions and then Erase DTC Memory.
- Read readiness code. If DTC memory has been erased or engine control module was disconnected from permanent positive, readiness code must be generated again.
Monitors, Trips, Drive Cycles and Readiness Codes
Monitors, Trips, Drive Cycles and Readiness Codes