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Pin Voltage Charts

VOLTAGE CHECKS (DIGIFANT I) VAG 1598

Pins Component To Be Tested & Condition (1) Specification
1 & 19 ECU Voltage Supply, Ign. On Battery Voltage
13 & 14 ECU Voltage Supply, Ign. On Battery Voltage
19 & 35 ECU Voltage Supply, Ign. On Battery Voltage
1 & 6 Wires To Ignition Coil, Ign. On Battery Voltage
1 & 4 CHECK ENGINE Light Circuit, Ign. On Battery Voltage
1 & 23 Idle Stabilizer Valve, Ign. On Battery Voltage
1 & 24 (Jumper) Fuel Pump Relay Circuit, Ign. On Fuel Pump Must Operate
1 & 20 Cyl. No. 1 Fuel Injector (2) Battery Voltage
1 & 21 Cyl. No. 2 Fuel Injector (2) Battery Voltage
1 & 3 Cyl. No. 3 Fuel Injector (2) Battery Voltage
1 & 2 Cyl. No. 4 Fuel Injector (2) Battery Voltage
19 & 25 (A/T) Starter Lockout Relay Circuit Ign. On, Select "P" then "N" Battery Voltage
" Ign. On, Select "1", "2", "D" & "R" No Voltage
1 & 25 (M/T) Wiring From Starter Term. 50, Operate Starter 8 Volts Minimum
11 & 28 Coolant Temperature Sensor (3) (3)
28 & 30 Intake Air Temp. Sensor (3) (3)
17 & 36 Diagnostic Connector, Jumper Connector Terminals 1.5 Ohms Maximum
10 & 28 CO Potentiometer, Ign. Off 0-2 Ohms
34 & 1 (4) Potentiometer Circuit, Potentiometer Disconnected 1.5 Ohms Maximum
2 & 33 (4) Potentiometer Circuit, Potentiometer Disconnected 1.5 Ohms Maximum
3 & 28 (4) Potentiometer Circuit, Potentiometer Disconnected 1.5 Ohms Maximum
1 & 28 (4) Hall Sender Ckt, Sender Disconnected 1.5 Ohms Max.
2 & 37 (4) Hall Sender Ckt, Sender Disconnected 1.5 Ohms Max.
3 & 38 (4) Hall Sender Ckt, Sender Disconnected 1.5 Ohms Max.
1 & 29 (4) Knock Sensor Ckt, Sensor Disconnected 1.5 Ohms Max.
2 & 27 (4) Knock Sensor Ckt, Sensor Disconnected 1.5 Ohms Max.
3 & 8 (4) Knock Sensor Ckt, Sensor Disconnected 1.5 Ohms Max.
1 & 2 (4) O2 Sensor Ckt, O2 Sensor Disconnected 1.5 Ohms Max.
3 & 16 (4) O2 Sensor Ckt, O2 Sensor Disconnected 1.5 Ohms Max.
3 & 9 (4) O2 Sensor Circuit, O2 Sensor Connected Infinity/Open
1 & 16 (4) O2 Sensor Ckt O2 Connector Reconnected Infinity/Open
32 & 35 A/C Relay Circuit, Ign. On 1.0 Ohm Max.
33 & 34 Throttle Potentiometer (Power), Disconnect Potentiometer, Ign. Off 3.5-5.0 Volts
28 & 34 Throttle Potentiometer (Power), Disconnect Potentiometer, Ign. On 4.5-5.0
33 & 28 Throttle Potentiometer, Connect Potentiometer, Ign. On "
" Idle 0.3-1.7 Volts
" Full Throttle 3-5 Volts
28 & 38 Hall Sender (Power), Ign. On 10 Volts Min.
28 & 37 (5) Hall Sender (Signal), Ign. Off, Operate Starter LED Must Flicker
1 & 6 (5) Ign. Signal Function, Ign. Off, Operate Starter LED Must Flicker
18 & 28 (5) RPM Signal Operate Starter LED Must Flicker
(1) TESTING CONDITIONS: Turn ignition off. Disconnect harness connector from ECU. Connect Test Box (VAG 1598) to ECU harness connector using Adaptor Cable (VAG 1598/2), leaving ECU disconnected.
(2) Turn ignition on, remove fuse No. 18 and jumper terminals No.1 and 24.
(3) Refer to I - SYS/COMP TESTS or SENSOR RANGE CHARTS articles in the ENGINE PERFORMANCE Section.
(4) Terminal number indicated is the component's terminal number and not of ECU or Test Box.
(5) 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).
VOLTAGE CHECKS (DIGIFANT II) VAG 1598

Pins Component To Be Tested & Condition (1) Specification
13 & 14 Voltage Supply (Control Unit), Ign. On Battery Voltage
14 & 19 Voltage Supply (Control Unit), Ign. On Battery Voltage
3 & 13 (Jumper) Wires To Fuel Pump Relay, Ign. On Pumps Must Run Audibly
1 & 13 Wires From Starter Term. 15, Operate Starter, Then Turn Ign. Off 8 Volts Minimum
6 & 10 Coolant Temperature Sensor (2) (2)
6 & 9 Intake Air Temp. Sensor (2) (2)
22 & 23 Idle Stabilizer Valve Circuit, Ign. Off 2-10 Ohms
6 & 8 Hall Sender Circuit, Disconnect & Jumper All Term. Continuity, .5 Ohm Max.
6 & 18 Hall Sender Circuit, Disconnect & Jumper All Term. Continuity, .5 Ohm Max.
4 & 5 Knock Sensor Circuit, Disconnect & Jumper All Term. Continuity, .5 Ohm Max.
4 & 7 Knock Sensor Circuit, Disconnect & Jumper All Term. Continuity, .5 Ohm Max.
6 (3)& 25 Hall Control Unit Circuit, Disconnect Hall Control Unit Continuity, .5 Ohm Max.
6 & 11 Idle & Throttle Switch, "
" Throttle Fully Closed .5 Ohm Max.
" Throttle Partly Open Open Circuit
" Throttle Wide Open .5 Ohm Max.
5 (4)& 12 Injectors, Disconnect 5-Pin Connector 3.7-5.0 Ohms
13 & 16 A/C Compressor Wiring, Disconnect Connector & Ground Green Wire Continuity, .5 Ohm Max.
2 & 13 O2 Sensor Circuit, "
" Conn. Disconnected & Grounded .5 Ohm Max.
" Connector Reconnected Open Circuit
6 & 17 Airflow Sensor Potentiometer, Ign. Off 500-1000 Ohms
17 & 21 Airflow Sensor Potentiometer, Move Airflow Sensor Flap Or Operate Starter Change In Resistance
(1) TESTING CONDITIONS: Turn ignition off. Disconnect harness connector from ECU. Connect Test Box (VAG 1598) to ECU harness connector using Adaptor Cable (VAG 1598/2), leaving ECU disconnected.
(2) Refer to I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section or SENSOR RANGE CHARTS article in the ENGINE PERFORMANCE Section.
(3) Terminal No. 6 is Hall Control Unit Green/Black wire terminal.
(4) Terminal No. 5 is 5-Pin connector to fuel injectors, located near coolant reservoir.
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