Diagnostic Readout Box

F23 Module box
1 -
2 Sensor ground
3 CMP sensor
4 -
5 Voltage supply, circuit 30
6 O2S 2 (after TWC) signal (G3/1)
7 O2S 1 (before TWC) signal (G3/2)
8 Engine speed signal (TNA)
9 Ground coding at W27 (Model 129)
10 Purge flow switchover valve (Y27/6)
11-15 -
16 DM pressure sensor (B5/2)
17 DM pressure sensor (B5/2)
18-22 -
23 Diagnostic wire to generic scan tool connector (X11/22)
24 -
25 Ground, module box bracket (W27), Model 129
Electronic ground ,right footwell (W15), Model 140 to end of Model Year 1995
Ground, right rear seat (W17), Model 140 as of Model Year 1996
Ground, left wheelhousing (W16/3), Model 210
26 Voltage supply, circuit 87
27 Diagnostic wire to data link connector X11/4 (38-pole)
28 "CHECK ENGINE" MIL
29 Ground coding from pin 25 (Model 210)
30 -
31 Ground from engine control module (N3/4)
H CAN data line (+)
(control modules HFM-SFI, EA/CC/ISC, CC/ISC, ETC, RCL)
L CAN data line (-)
(control modules HFM-SFI, EA/CC/ISC, CC/ISC, ETC, RCL)