All values measured to ground unless otherwise noted
Conn./Plug/Pin	Pin Information	Test Value	Comments
N4/31/2
1	"Diagnostic port" for DTC readout and diagnostic purpose	Ignition on 12 VDC	To be tested with HHT refer to D.M.
2	pin not used
3, 4	Main ground to W16/4	Approx. 0 Ohms to ground or measure to circuit 30 12 VDC
5	LF VSS input, processed in traction system ECM	Ignition on, lift front of vehicle. Turn left front wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving	20 mph / 200 Hz 35 mph / 330 Hz square wave
6	ETS signal input from traction system	Ignition on < 1 VDC Engine at idle 12 VDC
7	TNA signal output, short protected	Engine at idle > 3 VAC
8	pin not used
9	Rear axle VSS input, processed in traction system ECM	Ignition on, lift rear of vehicle. Turn any rear wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving	20 mph / 200 Hz 35 mph / 330 Hz square wave
10	pin not used
11	Control contact signal input CC switch operational recognition	Ignition on, CC switch: not activated <1 VDC all other positions 12 VDC
12-14	pins not used
15, 16 17, 18	Actuator motor voltage supply output low side high side	Ignition off, ECM disconnected, accelerator pedal in CTP position < 10 Ohms
19	pin not used
20	Voltage supply output to safety contact and CTP switch	Ignition on, acceleration pedal position CTP voltage varies in range of 6 - 12 VDC
21, 22	pins not used
23	Stop lamp switch (normally closed) input	12 VDC with brakes not applied, 0 VDC with brakes applied.
24	Stop lamp switch (normally open) input. Same signal as to brake lights	12 VDC with brakes applied, 0 VDC with brakes not applied
25	Engine idle mode recognition signal output	Ignition on, acceleration pedal position: CTP < 4.8 VDC WOT > 5.5 VDC
26	Circuit 50 starter lockout signal input	Lever pos P or N 12 VDC with key held in start position
27	Idle speed increase signal output, raises engine rpm with increasing load	Engine at idle, defrost on 12 VDC defrost off 0 VDC
28-33	pins not used
34	Magnetic clutch solenoid activation signal output (high side)	Ignition on, measure to pin 56 7.0 - 10 VDC
35, 36	pins not used
37	Safety contact switch signal input	Ignition on, acceleration pedal position CTP voltage varies in range of 6 - 12 VDC Slowly depress pedal until switching point occurs < 1 VDC
38-39	pins not used
40 41	Reference voltage output high side Reference voltage output low side	Ignition on measure to pin 41 4.7 - 5.3 VDC	Note 1
42	Fuel cut off signal output	Ignition on 2.2 - 11 VDC	Feed from M16/2
43	pin not used
44	CAN-Bus (high side). High speed data transfer bus input and output, shares data with other ECMs	No reliable test. Check continuity to other ECMs approx. 5 VAC when data is on bus.	HHT is also used for CAN diagnosis
45	CAN-Bus (low side). high speed data transfer bus input and output, shares data with other ECMs
46	pin not used
47	Memory recall activation signal input	Ignition on, CC switch: not activated <1 VDC memory recall 12 VDC
48	CC switch OFF mode recognition signal input	Ignition on, CC switch: not activated 12 VDC OFF <1 VDC
49	Acceleration activation signal input	Ignition on, CC switch: not activated <1 VDC accelerate/set 12 VDC
50	Decelerate activation signal input	Ignition on, CC switch: not activated <1 VDC decelerate/set 12 VDC
51, 52	Circuit 87, switched power output, supplies EA/CC/ISC system	Ignition on 12 VDC
53-55	pins not used
56	Magnetic clutch solenoid activation signal output (low side)	see pin 34
57-58	pins not used
59	CTP switch signal input	Ignition on, acceleration pedal position CTP voltage varies in range of 6 - 12 VDC
60	pin not used
61	Actual value potentiometer signal input	Ignition on CTP > 4.75 VDC, WOT < 0.25 VDC	Note 1
62	pin not used
63	Reference potentiometer signal input	Ignition on CTP > 4.85 VDC, WOT < 0.25 VDC	Note 1
Note 1	Nominal value 5.0 VDC used as ref. voltage in other test steps. Deviation from this value has to be calculated to or from actual value accordingly	for details refer to D.M. engines vol 3 section 7.3