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Wow you know what now that I really look at it it looks as though you could switch the red 2,5v wire coming off the relay module to the A7/3 and elminate the traction control all to together, the A7/3 is the pump with the all the sensors inputting to it.
Maybe even one could put a potentiometer on to the sensors inputting to the pump and have a certain degree of tunability of the system from all sensors 0% to 100%
Heres the diagnostic of the diagram i put up
N47-2
1.1 LF VSS output, generated by L6/1, processed in ECM and sent to other ECMs 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
1.2 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
1.3 LR VSS output, enerated by L6/3, to engine control modul Ignition on, lift rear of vehicle.
Turn left rear wheel > 1 rev/sec by hand
> 3 VAC or with vehicle moving 20 mph / 200 Hz
35 mph / 330 Hz
square wave
1.4 Stop lamp switch (normally closed) input Ignition on, 12 VDC with brakes not applied,
0 VDC with brakes applied.
1.5 Pin not used
1.6 Parking brake switch ground signal input Approx. 0 Ohm to ground with parking brake pedal depressed
1.7,8 Pins not used
1.9 "Diagnostic port" for DTC readout and diagnostic purpose Ignition on 12 VDC To be tested with
HHT refer to D.M.
1.10 Pin not used
1.11 Stop lamp switch (normally open) input.
Same signal as to brake lights Ignition on, 12 VDC with brakes applied,
0 VDC with brakes not applied
1.12
1.13 Left rear axle VSS sensor, + input.
Left rear axle VSS sensor, - input. ECM disconnected
0.6-1.8 kOhm across pins 1.12 and 1.13
Sine wave. Frequency varies with wheel speed. Note 1
1.14
1.15 Right rear axle VSS sensor, + input
Right rear axle VSS sensor, - input ECM disconnected
0.6-1.8 kOhm across pins 1.14 and 1.15
Sine wave. Frequency varies with wheel speed Note 1
1.16-28 Pins not used
1.29
1.30 Right rear brake pad wear recognition, lights
indicator lamp when pads worn down ECM disconected:
Open circuit in normal condition.
Short circuit with brake pads worn down.
2.1
2.2 SPS valve low side, determines steering force requirement depending on vehicle speed
SPS valve high side No reliable test, valve is current contolled
> 0.8 A at low speed (low steering force)
< 0.4 A at high speed (high steering force) Coil resistance
3 - 8 Ohm
2.3-9 Pins not used
2.10 Circuit 87 ABS switched power input, switched by relay K40k5 Ignition on 12 VDC Feed via Z99/1
2.11-16 Pins not used
2.17
2.18 Right front axle VSS sensor, + input
Right front axle VSS sensor, - input ECM disconnected
0.8-2.3 kOhm across pins 2.17 and 2.18
Sine wave. Frequency varies with wheel speed Note 1
2.19
2.20 Right front brake pad wear recognition, lights
indicator lamp when pads worn down ECM disconected:
Open circuit in normal condition.
Short circuit with brake pads worn down.
2.21,22 Pins not used
2.23 Main ground to W16/3 Approx. 0 Ohm to ground or
measure to circuit 30 12 VDC Same as pin 2.47
2.24 Pin not used
2.25 Return pump relay activated monitoring signal input and pump voltage supply 12 VDC to pin 2.27 with relay activated
2.26
2.27 Return pump relay common output
activation signal output
12 VDC to pin 2.26 with relay activated Coil resistance approx. 40-80 Ohm
2.28 Switchover valve signal output, switched ground activates solenoid valve A7/3y5
12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.29 Inlet valve signal output, switched ground activates solenoid valve A7/3y15 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.30 Right rear axle hold valve signal, switched ground activates solenoid valve A7/3y12 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.31 Right rear axle release valve signal, switched ground activates solenoid valve A7/3y13 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohm to ground
2.32-34 Pins not used
2.35 Left rear axle hold valve signal, switched ground activates solenoid valve A7/3y10 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.36 Left rear axle release valve signal, switched ground activates solenoid valve A7/3y11 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohm to ground
2.37 Right front axle release valve signal, switched ground activates solenoid valve A7/3y9 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohm to ground
2.38 Left front axle release valve signal, switched ground activates solenoid valve A7/3y7 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 2.8-6.6 Ohm to ground
2.39 Left front axle hold valve signal, switched ground activates solenoid valve A7/3y6 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.40 Right front axle hold valve signal, switched ground activates solenoid valve A7/3y8 12 VDC with valve energized
0 VDC with valve not energized
ECM disconnected 5.4-12.6 Ohm to ground
2.41
2.42 Left front brake pad wear recognition, lights
indicator lamp when pads worn down ECM disconected:
Open circuit in normal condition.
Short circuit with brake pads worn down.
2.43
2.44 Left front axle VSS sensor, - input.
Left front axle VSS sensor, + input. ECM disconnected
0.8-2.3 kOhm across pins 2.43 and 2.44
Sine wave. Frequency varies with wheel speed. Note 1
2.45 Pin not used
2.46 Hydraulic unit solenoid valve power input Ignition on 12 VDC
2.47 Main ground to W16/3 Approx. 0 Ohm to ground or
measure to circuit 30 12 VDC Same as pin 2.23
2.48 Circuit 30 main power input 12 VDC at all times
3.H 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
3.L CAN-Bus (low side)
Note 1 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.
Last edited by Turbo E320; 01-22-2008 at 05:42 PM.
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