Pin Voltage Charts

VAG 1598 TEST CONNECTOR PIN VOLTAGE CHECK

Terminals

Component To Be Tested & Condition

Value or Result

1 & 19

Voltage To Control Unit, Ignition ON

Battery Voltage

19 & 35

Voltage To Control Unit, Ignition ON

Battery Voltage

1 & 6

Wires To Coil, Ignition ON

Battery Voltage

1 & 4

Fault Indicator Light, Ignition ON

Battery Voltage

1 & 23

Idle Stabilizer Valve, Ignition ON

Battery Voltage

1 & 24 (Jumper)

Wires To Fuel Pump Relay, Ignition ON

Pumps Must Run Audibly

1 & 20

Wiring To Injector, Cyl. No. 1 ⁽¹⁾

Battery Voltage

1 & 21

Wiring To Injector, Cyl. No. 2 ⁽¹⁾

Battery Voltage

1 & 3

Wiring To Injector, Cyl. No. 3 ⁽¹⁾

Battery Voltage

1 & 2

Wiring To Injector, Cyl. No. 4 ⁽¹⁾

Battery Voltage

28 & 34

Throttle Potentiometer (Power),Ignition ON

4.5-5.0 Volts

33 & 28

Throttle Potentiometer Connected, Ignition On, Throttle Setting: Idle

0.3-1.7 Volts

33 & 28

Throttle Potentiometer Connected, Ignition On, Throttle Setting: WOT

3-5 Volts

28 & 38

Hall Sender (Power), Ignition ON

10 Volts Min.

37 & 38

Hall Sender (Signal), ⁽²⁾ Ignition OFF Operate Starter

LED Must Flicker

1 & 6

Ignition Signal Function, ⁽²⁾ Ignition Off Operate Starter

LED Must Flicker

⁽¹⁾	With Ignition ON and fuse No. 18 removed, jump terminals No.1 and 24 together.

⁽²⁾	Perform test only if engine will not start. Turn ignition off. Instead of multimeter, connect LED Tester (US 1115) using Adapter Kit (VW 1594). Disconnect harness from fuel rail (main injector connector).

ECU CONNECTOR PIN VOLTAGE CHECK

Terminals	Component To Be Tested & Condition	Value or Result
1 & 2	Control Unit Voltage & Ground Connection Ignition ON	Battery Voltage
1 & 2	Voltage Supply, Ignition OFF, Operate Starter	8 Volts Minimum