Fuel Injectors, Checking

Fuel Injectors, Checking

Recommended special tools and equipment
- V.A.G1526 multimeter or V.A.G1715 multimeter
- V.A.G1594 connector test kit
- Wiring diagram

Test requirements







- Fuses on E-box in engine compartment, left side, must be OK.

NOTE: Fuses on this fuse holder are labelled "SB" in the wiring diagram







- Fuses on fuse holder in instrument panel, left side, must be OK.

NOTE: Fuses on this fuse holder are labelled "SC" in the wiring diagram.

- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence
Observe safety precautions.
Observe rules for cleanliness.

- Remove intake manifold.







- Disconnect harness connectors for Cylinder 1 Fuel Injector -N30- through Cylinder 4 Fuel Injector -N33- (-arrows-).

Resistance values of fuel injectors, checking







- Test resistance of fuel injectors between terminals using adapter cables.

Specified value: 0.5 to 5.0 Ohms

NOTE: Resistance value is valid at approx. 20 degrees C. At higher temperatures, resistance value increases.

If specified value is not obtained:
- Replace faulty fuel injector (Cylinder 1 Fuel Injector -N30- through Cylinder 4 Fuel Injector -N33-), removing and installing fuel injectors.
- Install intake manifold.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If specified value is obtained:
- Check wires to Engine Control Module (ECM) according to wiring diagram.

Checking wires to Engine Control Module (ECM)
- Connect test box to 60-pin connector of wiring harness. Test Box, Connecting For Wiring Test

Engine Control Module (ECM) is not connected.







- Check wires between test box and 2-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.

Wire resistance: max. 3.0 Ohms







- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.


Specified value: Infinity Ohms

- Install intake manifold.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are detected in the wires and the resistance values are OK:
- Replace Engine Control Module (ECM) -J623-.