Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

1 Answer

Sensor voltage? I have 24 vdc at the door control terminals. Should I also have 24vdc to power the sensors? Or is the sensor voltage different? Do I need to order a new logic board?

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  • Don Maggard May 11, 2010

    Please post the actual problem you are having.

  • Don Maggard May 11, 2010

    Please tell us the problem you are having and we will try to help. We don't need voltages.



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  • Master
  • 3,197 Answers

Try aligning the sensors and see if you can't get it working. They must be pointed at one another to work correctly.

Posted on Jul 29, 2009


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Error code ch n ch2 lg air con

Indoor inlet pipe sensor. Cause of error, Open/short, Solder poorly, internal circuit error.

Check point & Normal condition, Normal resistor 5 ohm at 25 C unplugged.

Normal Voltage: 2.5 vdc/ at 25 C ( plugged in )

Check Point:
1. Unplug the sensor on the indoor unit PCB.
2. Estimate the resistance of the sensor.
3. If the resistance of the sensor is 10 ohms/ 5 ohms at 25 C then the sensor is normal.
4. If the resistance of the sensor is - 0 - ohms then replace the sensor.
5. Plug the sensor on the PCB and Power on.
6. check voltage.
7. If voltage of sensor is 2.5 VDC at 25 C then the sensor is normal.
8. If the resistance is O or 5 Vdc replace the PCB.

Apr 02, 2015 | LG Heating & Cooling

1 Answer

Raccoon ate ate my sensor wires. Can I override them so I can use my remotes?

The safest thing to do is fix them. It really isn't hard, I have done it myself. The wires are small and you can buy move at hardware store or radio shack. When you get them repaired, spray them with ammonia.. raccoons do not like that. This is from the Internet: Low-Voltage Circuits 1 Raise the garage door using the control button on the garage wall or the remote control unit from a vehicle. Inspect each sensor to make sure the green or red power-indicator lights are illuminated. Proceed to the next step if one or both lights are not illuminated.
2 Stand a stepladder at the area of the garage door opener unit. Unplug the power cord from the outlet at the ceiling. Remove the cover at the back of the unit. Identify the connection terminals where the ends of the low-voltage senor wires attach. Reattach a loose wire to the appropriate terminal. Tighten the terminal screw with a small screwdriver. Plug in the power cord and observe the lights on the sensors. If both lights are not illuminated, proceed to the next step.
3 Inspect the double-strand insulated low-voltage wires from each sensor to the back of the garage door opener. Use the stepladder to inspect the wires near the upper part of a wall and at the ceiling. If no damage is noted, one or both sensors must be replaced. Proceed to the following steps if any wires are bare, burned or broken in one or more places.
4 Loosen the terminal screws that connect the faulty wires at the back of the overhead unit. Start at the ceiling and pull the wires out of the insulated fasteners at the ceiling, walls and along the side of the door opening to the sensor. Disconnect the ends of the wires from the terminals on the sensor.
5 Determine the length of a replacement wire using the faulty wire. Cut a piece of new double-strand insulated low-voltage wire to length with electrical pliers. Strip 1/2 inch of insulation off the both strands at one end. Attach the ends to the appropriate terminals on the sensor.
6 Start just above the sensor. Feed the opposite end of the wire through the fasteners at the side of the door, the wall and the ceiling. Strip the ends of the wires as before. Connect the wires to the appropriate terminals and tighten the screws. Plug in the power cord to the opener unit.

Feb 04, 2015 | Building Materials

1 Answer


I would need to know which sensor you are having problems with to give a better answer. There are two systems used with computer controlled engines, one system sends a controlled 5v to the sensor and reads the voltage returning through the second wire. A single wire sensor is usually for a gauge, they measure the difference between battery negative and the signal they receive from the sensor, this is done inside the gauge.
Is it possible the two wire sensor you need to plug into is located in a different position in the engine?
Hope that helps


Nov 20, 2012 | 2004 Toyota Corolla

1 Answer


Hi there:Test the MAP Sensor output voltage at the MAP Sensor connector terminal B (as marked on the sensor body). This is done with the ignition switch ON and the engine OFF. Output voltage should be 4-5 volts.

The voltage should drop to 1.5-2.1 volts with a hot, neutral idle speed condition.

Test engine controller (terminal 5) for the same voltage as described above to verify the wire harness condition. Repair as necessary.

Test MAP Sensor supply voltage at sensor connector (terminal C) with the ignition ON. The voltage should be approximately 5V (+/- 0.5V). 5V (+/- 0.5V) should also be at terminal 6 of the engine controller wire harness connector.

Test the MAP Sensor ground circuit at the sensor connector (terminal A) and the engine controller connector (terminal 4).

Test the MAP Sensor ground circuit at the engine controller connector between terminal 4 and terminal 11 with an ohmmeter. If the ohmmeter indicates an open circuit, inspect for a defective sensor ground connection. This connection is located on the right side of the cylinder block, at the oil dipstick tube mounting stud. If the ground connection is good, replace the engine controller. If terminal 4 has a short circuit to 12V, correct this condition before replacing the engine controller.

Also could check this video...

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

May 07, 2012 | 1998 GMC Jimmy

1 Answer

How to wire hunter rain clik rain sensor to r8816p101c

1) There are different rain clik model numbers shown in manual
Open 24 volt Rain clik manual:

2) The rain sensor has two wires.
And two additional wires are needed to run from rain sensor to sprinkler timer. For example, buy thermostat wire from local hardware store if wire is not supplied.

3) The rain sensor has a terminal block where wires are connected. .
Open manual above to identify markings on your terminal block.
For example Figure 1 shows SRC model, and with this model number, the rain sensor wires connect to terminals RS and C, and then two wires going to timer connect to terminals RS and and 1.

4) R8816P101C is 208-240Volt 24-hour irrigation timer.
Timer has two separate terminals for attaching rain sensor.

5) Timer power connections have 4 terminals. Do not connect rain sensor to power terminals.
Connect wires from sensor to the two sensor terminals.

6) Timer slide-switch must be set to ON position for rain sensor operation.
Sensor sends continuous 24Volts to irrigation timer.
When it rains, the rain sensor stops sending 24Volts to timer. Timer responds by not turning on power to irrigation pump.
To by-pass rain sensor, move timer slide-switch to off position.

7) Open following link for Intermatic replacement parts:

8) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Sep 05, 2011 | Intermatic R8816P101C -...

1 Answer

My 2003 town and country is running rough and sputtering i got code p1297 I replacep the map sensor and it did not fix the problem. What could be the problem

Hi, please use a voltmeter set to VDC to check the inputs and outputs of the MAP sensor as indicated below. Please get back to me with questions or results of your test.

  1. Visually check the connector, making sure it is attached properly and that all of the terminals are straight, tight and free of corrosion. Reinstall the connector and probe the back of the connector where the wires go in to check the output as follows.
  2. Test the MAP sensor output voltage at the sensor connector between terminals B and C (2.4L, 3.3L and 3.8L engines), or A and B (3.0L engine).
  3. With the ignition switch ON and the engine not running, the output voltage should be 4-5 volts. The voltage should fall to 1.5-2.1 volts with a hot, neutral idle speed condition. If OK, go to the next step. If not OK, go to Step 5.
  4. Test the PCM terminal 36 for the same voltage described in the previous step to make sure the wire harness is OK. Repair as necessary.
  5. Test the MAP sensor ground circuit at the sensor connector terminal A (2.4L, 3.3L and 3.8L engines) or C (3.0L engine) and PCM terminal 43. If OK, go to the next step. If not OK, repair as necessary.
  6. Test the MAP sensor supply voltage between the sensor connector terminals A and B (2.4L, 3.3L and 3.8L engines), or A and C (3.0L engine) with the ignition key in the ON position. The voltage should be about 4.5-5.5 volts.
  7. There should also be 4.5-5.5 volts at terminal 61 of the PCM. If OK, replace the MAP sensor.
  8. If not, repair or replace the wire harness as required.

Trouble Code: P1297

No Change In MAP Signal From Start To Run Transition
Possible Causes:

Engine vacuum port to MAP Sensor clogged, dirty or restricted MAP Sensor signal is skewed or the Sensor is out-of-calibration MAP Sensor VREF circuit open or grounded (intermittent fault) PCM has failed

Aug 26, 2011 | Chrysler Town & Country Cars & Trucks

1 Answer

Err22 showing.How can I start?My machine is Precor 956 model.

The speed sensor is a hall effect sensor that emits a pulse when a flywheel lobe passes between
its transmitter and receiver. The speed control circuit processes the pulse train emitted by the
speed sensor. The speed sensor signal is a real time representation of the operating speed of
the treadmill. The speed control circuit compares the real time speed (speed sensor output) with
the speed that it expects the treadmill to be operating at and acts accordingly to control treadmill
speed or initiate an error code sequence, if necessary. Typically, if a problem exists with the
speed sensor the drive motor will operate (perhaps only briefly) before a speed related error
occurs (errors 20-26).
1. Set the treadmill circuit breaker in the “on” position. Using a DC voltmeter, measure
the voltage between terminal 3 of J2 (green wire) and terminal 4 of J2 (black wire) on
the lower PCA. Slowly, rotate the drive motor flywheel. The voltage should read
approximately 5 Vdc when a flywheel lobe is between the speed sensor “legs” and
approximately 0.25 Vdc when a flywheel lobe is not between the speed sensor “legs”

2. If the voltages in step 1 are correct, go to step 5. If the voltage in step 1 is 0 Vdc or
significantly low when a flywheel lobe is between the speed sensor “legs, continue with step
3. Measure the voltage between terminal 1 of J2 (red wire) and terminal 4 of J2 (black wire) on
the lower PCA. The voltage should read approximately 5 Vdc.
Sensor C954, C956 Treadmill
Page 1-24 Page 24
4. If the voltage is missing or significantly low, disconnect the speed sensor plug from the lower
PCA. Measure the voltage between pins 1 & 4 of the J2 plug on the lower PCA. If the
voltage is approximately 5 Vdc, replace the speed sensor. If the voltage is missing or
significantly low, replace the lower PCA.
5. At this point the speed sensor output is good, but a speed error occurs. There are two
potential causes for this condition. They are upper PCA or lower PCA. There are no good
means of troubleshooting these components other than substituting known good
components. Replace only one component at a time. If the component that you replaced
does not correct the problem, replace the original component. Try substituting the lower
PCA first then the upper PCA, if necessary.

tips extracted from the technical manual Precor956

Jul 14, 2010 | Precor C956i Treadmills with HR /...

1 Answer

The washer does not run through the wash cycle. The door locks but nothing further happens. There is an "LE" error message but I do not have a manual that explains what that means. Please help.

The LE error message means locked motor error and it is almost always accounted for an out-of-order Hall Effect Sensor. Other causes includes defective Main Board and broken wiring harness.

To check the Hall Effect Sensor:
  1. Unplug the machine.
  2. Remove the top plate assembly by unscrewing the two screws on the back of the top plate.
  3. Look for the Main Board assembly on the rear left side of the machine.
  4. Remove the power connector and sensor switch assembly.
  5. Remove the Main Board assembly protection cover by releasing the latches along its sides.
  6. Look for the 4-pin white connector with white, gray , red, and blue wires. It is the wiring harness going to the Hall Effect Sensor. Disconnect it from the board.
  7. Using a multimeter, check the resistance between the white and blue wires and between the white and red wires. Resistance should read about 10k ohms.
  8. If either resistance reads open, check for a broken wiring harness and repair or replace as necessary. Otherwise, the Hall Effect Sensor is defective and must be replaced.
  9. If the tests above show that the Hall Effect Sensor seemed to be good, you have to check if the Main Board delivers 10 to 15 Vdc supply to it.
  10. Reconnect the machine to the power outlet.
  12. Set the multimeter to DC volt and measure the voltage between white and gray wire terminals on the Main Board. Voltage should be 10 to 15 Vdc. Otherwise, the Main Board is defective and must be replaced.
  13. Connect the red test lead to the red wire and the black test lead to the gray wire.
  14. Turn the motor rotor slowly by hand.
  15. You should measure a pulsating 10 Vdc if the Hall Effect Sensor is okay.
  16. Repeat the step with the red test lead connected to the blue wire.
  17. If you measure a 10 Vdc but not pulsating, the Hall Effect Sensor is defective and must be replaced.
Feel free to inform me if the Hall Effect Sensor or the Main Board needs to be replaced and if you want to replace it yourself.

Dec 31, 2009 | LG WM-2277HW Front Load Washer

1 Answer

1998 mitsubishi diamante o2 sensor, o2 heater, EGR sys NOT READY

Check the O2 sensor heaters with an ohmmeter. Also test the EGR solenoid valve by applying 12 vdc directly to the solenoid pins.

Disconnect the HO2S.
  1. Measure the resistance between PWR and GND terminals of the sensor. Resistance should be approximately 6 ohms at 68°F (20°C). If resistance is not within specification, the sensor's heater element is faulty.
  2. With the HO2S connected and engine running, measure the voltage with a Digital Volt-Ohmmeter (DVOM) between terminals HO2S and SIG RTN(GND) of the oxygen sensor connector. Voltage should fluctuate between 0.01-1.0 volts. If voltage fluctuation is slow or voltage is not within specification, the sensor may be faulty.


Aug 21, 2017 | 1998 Mitsubishi Diamante

4 Answers

Epson CX11NF Error Message Service Req E511

This is from the service manual
Service Req E511
�� Possible parts that caused the error�� Troubleshooting
�� Photoconductor Unit �� SENSOR TR-0
1 Check of Photoconductor Unit attachment
Re-attach Photoconductor Unit.
Does the error recur when the power is turned
Go to Step [2]. End of
2 Operation check of Photoconductor Unit
Is the Drum of Photoconductor Unit rotating?
Go to Step [3]. Go to Step [10].
3 Check for dirt on silver seal on Belt in
Photoconductor Unit
Remove Photoconductor Unit.
Turn gear of Photoconductor Unit until silver
seal attached to Belt can be seen.
Is silver seal dirty?
Go to Step [4].
4 Check of SENSOR TR-0 (TR0 Sensor)
Remove Photoconductor Unit.
Is SENSOR TR-0 attached securely?
Go to Step [5]. Re-attach
TR-0, and go to
step [5].
5 Check of dirt and foreign bodies on surface
Remove Photoconductor Unit.
Are there any dirt or foreign bodies on the
SENSOR TR-0 surface?
Clean to remove
any dirt or
foreign bodies,
and go to step
Go to Step [7].
6 Does the error recur when the power is
turned ON?
Go to Step [7]. End of
7 Operation check of SENSOR TR-0
Remove Photoconductor Unit.
The voltage of P416-2 ↔ P416-3 on PWBA
MCU is 5 VDC when silver paper or other
reflective object comes close to the sensing
area of SENSOR TR-0, and is 0 VDC when
the object is released?
Replace PWBA
MCU. (p.404)
Go to Step [8].
8 Check of 5 VDC power supply to SENSOR
The voltage of P416-1 ↔ P416-3 on PWBA
MCU is 5 VDC?
Go to Step [9]. Go to Step [14].
9 Continuity check of HARNESS-ASSY XERO
Disconnect the P/J416 from PWBA MCU.
Do all of the wiring below have normal
J416-1 ↔ J108-3
J416-2 ↔ J108-2
J416-3 ↔ J108-1
10 Check after replacement of MOTOR ASSY
Replace MOTOR ASSY P/R. (p.398)
Does the error recur when the power is turned
Go to Step [11]. End of
11 24 VDC power supply check to MOTOR
Disconnect P/J201 from MOTOR ASSY P/R.
The voltage of J201-1 ↔ J201-2 is 24 VDC?
Go to Step [12]. Go to Step [13].
12 Continuity check of HARNESS ASSY MAIN
Disconnect the P/J403 from PWBA MCU.
Is the continuity normal between all terminals
of J403 ↔ J200?
Replace PWBA
MCU. (p.404)
Repair broken
or shorted part.
13 Continuity check of HARNESS ASSY MAIN
Disconnect P/J502 from LV/HVPS.
Do all of the wiring below have normal
J502-9 ↔ J201-1
J502-10 ↔ J201-2
Replace LV/
HVPS. (p.407)
Repair broken
or shorted part.
14 5 VDC power supply check to PWBA MCU
The voltage of P410-3 ↔ P410-4 on PWBA
MCU is 5 VDC?
Replace PWBA
MCU. (p.404)
Go to Step [15].
15 Continuity check of HARNESS ASSY MAIN
Disconnect P/J410 from PWBA MCU and P/
J502 from LV/HVPS.
Do all of the wiring below have normal
J410-3 ↔ J502-3
J410-4 ↔ J502-4
Replace LV/
HVPS. (p.407)
Repair broken
or shorted part.

May 22, 2008 | Epson Aculaser C1100 Printer

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