Terminal Layout of Diagnostic Module (OBD II)

Diagnostic Module Terminal Layout:

1 Sensor ground
2 Ground
Model 129: Module box bracket (W27)
Model 202: Component compartment (W16/4)
3 Voltage supply, circuit 87
4 Voltage supply, circuit 30
5 -
6 Data link connector (X11/4, 38-pole)
7 Diagnostic module coding (Engine 104 only)
8 Diagnostic module coding (Model 129 only)
9 CHECK ENGINE MIL
10 -
11 O2S 2 (after TWC) signal
12 Purge flow switchover valve
13 -
14 O2S 1 (before TWC) signal
15 Ground from Engine control module (N3/4)
16 -
17 Diagnostic wire to generic scan tool connector (X11/22, 16-pole)
18 DM pressure sensor (B5/2)
19 Engine speed signal (TNA)
20 CMP sensor signal
21 -
22 DM pressure sensor (B5/2)
H CAN Data line (+) (Engine control module, EA/CC/ISC control module)
L CAN Data line (-) (Engine control module, EA/CC/ISC control module)