Electrical Testing

Electrical Testing

Special tools and test equipment:

- VAG1526A multimeter
- VAG1598/20 test box
- VAG1594A connector test kit

NOTE:
- Use VAG1526A multimeter for the test. The tables list which measures range needs to be selected before taking each measurement.
- The specified values are valid for an ambient temperature of 0 to 40 °C (32 to 104 °F).
- If the values obtained differ from the specified values, determine the malfunction using the applicable wiring diagram.
- If the measured values only deviate slightly from the specified values clean sockets and connectors of testers and repeat test. Before replacing a component, check wires and connections. If the specified values are below 10 Ohms repeat the resistance measurement on the component.
- Use VAG1598/20 adapter to connect test equipment.
- The contact numbers of the connector and the socket numbers of VAG1598/20 test box match up.
- To check the multi-function switch, it is not necessary to connect test box VAG1598/20 because first the connectors for the multifunction switch are checked.

CAUTION!
To avoid permanent damage of electronic components, select the appropriate measuring range on tester before connecting the measuring leads.

Test requirements
- Battery voltage OK
- Fuses for Transmission Control Module (TCM) OK
- Fuses for component being tested OK. The fuse holder is behind a cover on the side of the instrument cluster.
- Ground (GND) connections OK:

Check battery Ground (GND) strap and Ground (GND) strap between body and transmission.

Check Ground (GND) connections for Transmission Control Module (TCM).

- For all test steps, switch ignition off, disconnect multi-pin connector for Transmission Control Module (TCM) -J217- (located in front of passenger seat under carpet in foot well) and connect VAG1598/20 adapter to wiring harness connector.
- If measuring values do not match specifications, follow instructions in right-hand column of test table (labelled "Corrective action").
- Always perform all steps indicated in the "Corrective action" column
- Only perform test steps recommended in the DTC table (selective troubleshooting).

88-pin connector for Transmission Control Module (TCM) -J217- (sockets on VAG1598/20)

1 - Solenoid valve 5 -N92-
2 - Shift lock solenoid -N110-
3 - Vacant
4 - Solenoid valve 7 -N94-
5 - Solenoid valve 4 -N91-
6 - Ground (GND) for power consumers, term. 31
7 - Vacant
8 - Multi-function TR switch -F125-, L2
9 - Multi-function TR switch -F125-, L4 supply voltage for cruise control system
10 - Brake light switch -F- (not for E-gas and V6-TDI)
11 - Vacant
12 - Vacant
13 - Tiptronic recognition
14 - Transmission VSS -G38-
15 - Transmission VSS -G38- (shielding)
16 - Sensor for transmission RPM -G182-
17 - Signal for malfunction monitor (OBD II - request) 1) 2)
18 - Kick-down switch -F8- (not for E-gas and V6-TDI)
19 - Control input to transmission from ABS control module
20 - Engine intervention (via ignition timing) 1)
21 - ATF temperature sensor -G93-
22 - ATF temperature sensor -G93-
23 - Sensor for transmission RPM -G182- (shielding)
24 - Vacant
25 - Selector lever display (not for Highline combi)
26 - Supply voltage (terminal 30) with or without fuses depending on model See wiring diagram
27 - Kick-down for air conditioning 1)
28 - Ground (GND) for electronics (terminal 31) 4)
29 - Solenoid valve 6 -N93-
30 - Solenoid valve 1 -N88-
31 - Vacant
32 - Solenoid valve 3 -N90-
33 - Solenoid valve 2 -N89-
34 - Ground (GND) for power consumers (terminal 31)
35 - Fuel consumption signal (engine torque, actual) 1)
36 - Multi-function TR switch -F125-, L1
37 - Multi-function TR switch -F125-, L3
38 - Vacant
39 - Vacant
40 - Engine speed (RPM) signal 1)
41 - Throttle position value (load signal) 1)
42 - Transmission VSS -G38-
43 - Vacant
44 - Sensor for transmission RPM -G182-
45 - Vacant
46 - Tiptronic upshift switch
47 - Tiptronic downshift switch
48 - Vacant
49 - Vacant
50 - Vacant
51 - Upshift/downshift signal (for engine torque reduction)
52 - Supply voltage for solenoid valves
53 - Supply voltage for solenoid valves
54 - Supply voltage (terminal 15)
55 - Supply voltage (terminal 15)
56 - Vacant
Terminals 57 - 83 are vacant
84 - Vacant
85 - CAN-bus 3)
86 - CAN-bus 3)
87 - Vacant
88 - K-wire for On Board Diagnostic (OBD)

1) Only for vehicles without a CAN-bus.
2) Signal is transmitted to Transmission Control Module (TCM) via the Engine Control Module (ECM) and can only be checked in read measured value block.
3) Only for vehicles with a CAN-bus. Further information for CAN-BUS on the CAN-bus.
4) Pin 28 at the control module is vacant for vehicles with 10-pin connector of multi-function switch - F125-.

List of test steps (88-pin connector)
- Only perform test steps for the relevant component, as listed in DTC and Read Measuring Value Block tables.