Curiosii for ever!: Car repair manuals for everyone.
Home >> Volkswagen >> 2000 >> New Beetle (1C1) L4-1.8L Turbo (APH) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Fuel Injectors, Checking >> With Manufacturer's Scan Tool

With Manufacturer's Scan Tool



Fuel Injectors, Checking

Special tools, test equipment and auxiliary items
- Test box V.A.G 1598/31
- Multimeter (Fluke 83 or equivalent)
- Diode test lamp V.A.G 1527
- Adapter set V.A.G 1594
- Wiring diagram

Check conditions






- Fuses 28 and 32 must be OK
- Engine speed sensor must be OK, checking Engine Speed (RPM) Sensor, Checking
- The battery voltage must be at least 11.5 V
- Fuel pump relay must be OK

Checking resistance of injectors






- Pull connectors off injectors.






- Check resistance of injectors between contacts.
Specification: 12.0 - 17.0 Ohms

NOTE: The resistance figures are valid for approx. 20°C. At higher temperatures the resistance figures will increase.

If the specification is not attained:
- Replace malfunctioning injector, item 10.

Pay attention to the following when installing the injector:
- Replace O-ring 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.
- Fit 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, checking and erasing DTC memory.Reading Diagnostic Trouble Codes
- Read-out the readiness code. If the DTC memory has been erased or the engine control module was disconnected from permanent positive, the readiness code must be generated again. Monitors, Trips, Drive Cycles and Readiness Codes Monitors, Trips, Drive Cycles and Readiness Codes

Checking voltage supply






- Pull connectors off injectors.






- Connect diode test lamp to contact 1 and Ground of relevant injector connector.
- Operate starter and check voltage supply for the injector. The LED must light up.

If the LED does not light up:
- Switch off ignition.
- Check wire between 2 pin connector contact 1 and fuel pump relay (J17) for open circuit using wiring diagram. Wire resistance: max. 1.5 Ohms

Checking activation and voltage supply






- Pull connectors off injectors.






- Connect diode test lamp V.A.G 1527 to connector contacts of the injector to be tested using cables from V.A.G 1594.
- Operate starter and check the activation for the injector.

The LED must flicker

If the LED does not flicker:
- Switch off ignition.
- Remove inner plenum chamber cover, left:






- Connect test box V.A.G 1598/31 to control module wiring harness. The engine control module is not connected by this action.






- Check wiring for open circuit between test box and the 2-pin connectors for the injectors 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

- Additionally check wires for short to one another.
Specification: Infinity Ohms

If there is no malfunction in the wiring and the resistance measurement values are OK.:
- Replace Engine Control Module (ECM).
pro multis · Curiosii