| All values measured to ground unless otherwise noted | |||
| N30 | |||
| 1 | Circuit 87 ABS fused power input from Overvoltage protection relay module | Ignition on 12 VDC | Feed from K1 |
| 2 | Right front axle solenoid valve activation signal output | 12 VDC to pin 32 with valve activated | coil res. approx. 0.7-2.2 kOhms |
| 3 | pin not used | ||
| 4 | LF VSS sensor, - input | ECM disconnected 0.8-3.7 kOhms across pins 4 and 6 Sine wave. Frequency varies with wheel speed |
Note |
| 5 | LF VSS output, generated by L6/1, processed in ECM and sent to other ECMs | Ignition on, lift front of vehicle. Turn right front wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving |
20 mph / 200 Hz 35 mph / 330 Hz square wave |
| 6 | LF VSS sensor, + input | same as pin 4 | Note |
| 7 | Rear axle VSS sensor, + input. | ECM disconnected 0.6-3.2 kOhms across pins 7 and 9 Sine wave. Frequency varies with wheel speed |
Note |
| 8 | Rear Axle VSS output, generated by L6, processed in ECM and sent to other ECMs | Ignition on, lift front of vehicle. Turn right front wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving |
20 mph / 200 Hz 35 mph / 330 Hz square wave |
| 9 | Rear axle VSS sensor, - input. | same as pin 7 | Note |
| 11 | RF VSS output, generated by L6/2, processed in ECM and sent to other ECMs | Ignition on, lift front of vehicle. Turn right front wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving |
20 mph / 200 Hz 35 mph / 330 Hz square wave |
| 12-13 | pins not used | ||
| 14 | Return pump relay activated monitoring signal input and pump voltage supply | 12 VDC to pin 17 with relay activated | coil resistance approx. 40-80 Ohms |
| 15 | Circuit 61 (engine running) signal input processed in IC from circuit D+ |
Ignition on < 2 VDC engine at idle 12 VDC |
D+ signal from generator G2 |
| 16 | pin not used | ||
| 17 | Voltage supply output to return pump and solenoid valve relay | Ignition on 12 VDC measure to pin 27, 12 VDC with relay activated |
|
| 18 | Rear axle solenoid valve activation signal output | 12 VDC to pin 32 with valve activated | coil res. approx. 0.7-2.2 kOhms |
| 19 | pin not used | ||
| 20 | Main ground to W16/4 | Approx. 0 Ohms to ground or measure to circuit 30 12 VDC |
same as pin 34 |
| 21 | RF VSS sensor, - input | ECM disconnected 0.8-3.7 kOhms across pins 21 and 23 Sine wave. Frequency varies with wheel speed |
Note |
| 22 | pin not used | ||
| 23 | RF VSS sensor, + input | same as pin 21 | Note |
| 24 | pin not used | ||
| 25 | Stop lamp switch (normally open) input, same signal as to brake lights |
12 VDC with brakes applied, 0 VDC with brakes not applied | |
| 26 | pin not used | ||
| 27 | Solenoid valve relay activation switched ground signal output | 12 VDC to pin 17 with relay activated | coil resistance approx. 40-80 Ohms |
| 28 | Return pump valve activation switched ground signal output | 12 VDC to pin 17 with relay activated | coil resistance approx. 40-80 Ohms |
| 29 | ABS MIL signal output | Ignition on < 1VDC, indicator lamp on engine at idle 12 VDC, indicator lamp off |
|
| 30 | "Diagnostic port" for DTC readout and diagnostic purpose | Ignition on 12 VDC | To be tested with HHT refer to D.M. |
| 31 | pin not used | ||
| 32 | Solenoid valve relay activated monitoring signal input and valve voltage supply | Ignition on 12 VDC | |
| 33 | pin not used | ||
| 34 | Main ground to W16/4 | Approx. 0 Ohms to ground or measure to circuit 30 12 VDC |
same as pin 20 |
| 35 | Left front axle solenoid valve activation signal output | 12 VDC to pin 32 with valve activated | coil res. approx. 0.7-2.2 kOhms |
| Note | To test, spin wheel at 1 rev/sec, measure at least 120 mVAC between both wires of sensor. If voltage is OK, measure the sensor's resistance while pulling, twisting and bending the sensor wires, looking for intermittent opens. Finally, check the sensor tip and rotor teeth for dirt or breakage. An oscilloscope can also be used to check the waveform - chipped or dirty teeth show up as missing or malformed waves. | ||