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D6n parking brake won't release
- Thread starter Pushing forward
- Start date
Pushing forward
Well-Known Member
Was sent 266-1466, instead of 266-1478.
Pushing forward
Well-Known Member
Put new sensor on yesterday. Checked the duty cycle and was 99.3 no load and 99.7 with brake applied.
Nige
Senior Member
That seems weird on the face of it.
Did you try connecting the sensor to the machine harness before installing it on the brake pedal shaft and then rotate the shaft in the centre from one (internal) stop to the other while observing the % output.? You can feel the stops if you just turn it gently with a screwdriver.
Another thought. With the sensor removed can you grab hold of the end of the shaft that turns the sensor guts while someone else presses the brake pedal to confirm that the shaft is actually turning.?
Did you try connecting the sensor to the machine harness before installing it on the brake pedal shaft and then rotate the shaft in the centre from one (internal) stop to the other while observing the % output.? You can feel the stops if you just turn it gently with a screwdriver.
Another thought. With the sensor removed can you grab hold of the end of the shaft that turns the sensor guts while someone else presses the brake pedal to confirm that the shaft is actually turning.?
Last edited:
Pushing forward
Well-Known Member
I tested it uninstalled and turning it with a screwdriver.
Nige
Senior Member
I am struggling to make sense of what is happening. When the sensor is rotated from minimum to maximum signal the duty cycle should change significantly, usually from less than 5% to greater than 95%
Which wires on the machine harness side of the sensor are you connecting to when you measure the duty cycle.?
Which wires on the machine harness side of the sensor are you connecting to when you measure the duty cycle.?
Pushing forward
Well-Known Member
I connected to the red and black on the sensor side.
Nige
Senior Member
There are two sensors in close proximity in that area; the brake pedal
position sensor and the decelerator pedal position sensor.
On the machine side of the brake pedal position sensor connector what are the colours (and numbers if you can see them) of the three wires in the machine harness.?
position sensor and the decelerator pedal position sensor.
On the machine side of the brake pedal position sensor connector what are the colours (and numbers if you can see them) of the three wires in the machine harness.?
Pushing forward
Well-Known Member
They are black, green, and redish orange. Black has number 998 on it
Nige
Senior Member
That’s the wiring for the decelerator pedal sensor…..
The wires for the service brake pedal position sensor connector on the machine side are 140 Blue, G939 Pink, and F790 Brown.
On the illustration attached, the decelerator position sensor (lower) is #2, the service brake pedal position sensor (upper) is #7.
One reason why the sensors won’t swap is the one operates on an 8v supply from the ECM, the other one operates on a 24v machine voltage supply.
Attachments
Nige
Senior Member
The wires on the sensor side of the decel position sensor should be red, black, & white.
The corresponding wires on the service brake pedal sensor should be orange, black, & white.
The corresponding wires on the service brake pedal sensor should be orange, black, & white.
Pushing forward
Well-Known Member
The brake sensor wires are brown, pink and blue. On the decel sensor they are brown, orange and green. This on the harness side. The original brake sensor wires are white, black and orange. The original on the decel sensor are white, black and orange. The new brake sensor wires are white, black and red. The original brake sensor part number was 214 4863. The new updated part number is 266 1478.
Nige
Senior Member
Can you see a Part Number anywhere on the decel sensor.?
Please check the following with the key on and the sensors hooked up:-
1. On the decel sensor measure voltage between orange and brown on the machine harness. You should have 8v. Then measure the duty cycle between green & brown with the pedal up and with it down.
2. On the service brake pedal sensor measure voltage between blue and pink on the machine harness. You should have 24v. Then measure the duty cycle between brown & pink with the pedal up and with it down.
Please check the following with the key on and the sensors hooked up:-
1. On the decel sensor measure voltage between orange and brown on the machine harness. You should have 8v. Then measure the duty cycle between green & brown with the pedal up and with it down.
2. On the service brake pedal sensor measure voltage between blue and pink on the machine harness. You should have 24v. Then measure the duty cycle between brown & pink with the pedal up and with it down.
Pushing forward
Well-Known Member
Decel number 160 2443.
The volts on decel read 1.873 with duty cycle of 0 up or down.
Service brake volts were 24.17 with duty cycle reading 99.4 up and 99.7 depressed.
The volts on decel read 1.873 with duty cycle of 0 up or down.
Service brake volts were 24.17 with duty cycle reading 99.4 up and 99.7 depressed.
Nige
Senior Member
Please try measuring duty cycle between the white (signal) wire on each sensor and machine frame ground with pedal up/down. Let’s see if that produces any sensible numbers.
Nige
Senior Member
That’s the correct P/N.
Pushing forward
Well-Known Member
Readings come out the same.
Nige
Senior Member
Please try this. Start the engine and press the High Idle switch so that the engine goes to full RPM. Does the pressing the decelerator pedal work to control the engine RPM from high to low.?
Also with the engine running measure the supply voltage to the decel pedal sensor.
Also with the engine running measure the supply voltage to the decel pedal sensor.
Pushing forward
Well-Known Member
The decel is not working now. This is a new development.
Nige
Senior Member
But it also wasn’t working before (some wiring not connected.?) IIRC.
The thing is that without an 8v supply to the decel pedal sensor I’m pretty sure that it’s not going to work.
Turn the key on and give it 10-15 seconds for the panel self-test to complete. Does the SERV CODE icon come on during the test and does it stay on or go out afterwards.?
The thing is that without an 8v supply to the decel pedal sensor I’m pretty sure that it’s not going to work.
Turn the key on and give it 10-15 seconds for the panel self-test to complete. Does the SERV CODE icon come on during the test and does it stay on or go out afterwards.?