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How to test wipe motor qutside with frequency

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Posted on May 25, 2015


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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Ford escape 2006 rear wiper innoperative

Do you know how these wipers Work / what controls them ? Do you know what a smart junction box is ?
Rear Window Wiper Operation
The rear wiper motor is controlled by the SJB. The SJB supplies power to the rear wiper motor from the integrated rear wiper relay. The SJB will activate the relay when all of the following conditions are met:
  • Ignition switch is in the ON position
  • Liftgate glass and liftgate are closed
  • Multifunction switch is in the ON or INTERMITTENT position
The SJB also supplies voltage to the rear wiper motor from SJB fuse 21 (10A) when the ignition switch is in the ON position. This power feed is used to continue the wipe cycle when the multifunction switch is turned to the OFF position. The SJB receives inputs from the multifunction switch that applies ground to the low speed wipe input or applies ground to the intermittent wipe input. When either of these circuits are grounded, the SJB activates the integrated rear wiper relay and power is supplied to the rear wiper motor to move the rear wiper motor from the PARK position. An internal switch in the rear wiper motor then moves to the RUN position which connects the accessory relay power to the rear wiper motor. When the rear wiper motor returns to the PARK position, the internal switch in the rear wiper motor moves back to the PARK position. If the multifunction switch is in the ON position, the rear wiper relay is still activated, power is supplied to the rear wiper motor, and the wipe cycle starts again. If the multifunction switch is in the INTERMITTENT position, the rear wiper relay does not activate until the predetermined dwell time has elapsed, at which time the SJB activates the rear wiper relay and the wipe cycle starts again.

Do you know what DTC'S - diagnostic trouble codes are ?
Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index DTC Description Source Action B1244 Wiper Rear Motor Run Relay Coil Circuit Failure SJB If the rear wiper is inoperative, Go To Pinpoint Test B . If the rear wiper is always ON, Go To Pinpoint Test D . B1245 Wiper Rear Motor Run Relay Coil Circuit Short to Battery SJB Go To Pinpoint Test B . B1614 Wiper Rear Mode Select Switch Circuit Failure SJB Go To Pinpoint Test D .
Did you have it checked for DTC'S ?

Jan 17, 2018 | Ford Cars & Trucks

1 Answer


Blower motor control module would be a good guess , but is still just a guess . Testing the electrical circuit would need to be done to know for sure . Do you know how to test electronic's , automotive electrical circuits ?

HVAC Blower Controls Circuit Description
The blower motor is controlled by the blower control module. The blower control module receives the requested blower speed from the heater and A/C control in the form of a 5 volt pulse modulated reference signal. When low speed is requested by the heater and A/C control, the pulse width is reduced. When high blower speed is requested, the pulse width is increased. An open circuit, short to ground or short to battery on the blower speed input circuit of the blower control module will disrupt the pulse modulated reference signal. If the blower control module does not receive the pulse modulated signal, the blower motor will not operate. The blower control module receives power from the rear fuse block. The blower control module also provides a ground for the blower motor. A separate blower motor flange ground is used to limit radio frequency interference.

HVAC Blower Motor Circuit

Mar 24, 2017 | Pontiac Cars & Trucks

1 Answer

Adjusting wiper blades

you need to remove the wiper arms and run the motor on intermittent position .insure the motor turn the right direction.turn the switch off and wait to stop in park position,remove the ignition key.replace the arms and tight,the test

Mar 27, 2014 | 2008 Honda Accord

2 Answers

Windshield wipers will not turn off

either faulty wiper switch or wiper motor , need to be checked by a auto electrician

Mar 19, 2014 | 2005 Volvo XC90

1 Answer

Windshield wipers working intermittently. Sometimes takes 5 minutes before they begin to work. Other times stop in mid wipe.

This is the wiper motor failing...But to be safe unplug wiper motor,turn on wiper switch,connect test light to negative side of battery or good solid metal ground and stick probe in connector.if it is not working and the test light is not on then the wiper switch has failed.....and if the test light comes on at connector the wiper motor has failed..Since it works intermittently have an assistant to work the wiper switch and test a number of times to be sure.You can buy a cheap test light that will be good enough to check this at any auto parts store...BEFORE YOU BEGIN YOUR TEST MAKE SURE TEST LIGHT

Feb 28, 2011 | 2005 Volvo XC90

1 Answer

How to test the wipe motor ,to see if it is bad. took out the old one.and put new one in. work four times then stop.

Connect a positive and negative wire to your battery and touch them to the terminals on the motor and if it works it will be on high speed.

Feb 02, 2011 | 1995 Dodge Spirit

1 Answer

Polo 1.2E front wiper remains on intermittent wipe

either the self park isnt working or the switch is broke inside ,test switch with a meter and renew if necessary ,remove the back off the wiper motor and check the connections in their as well .

Dec 27, 2009 | Volkswagen Fox Cars & Trucks

3 Answers

After changing fuel pump 2 days ago on my 97 pontiac gtp. it started idling high (2500rpm) then today after getting code p0102(maf sensor) and codes p0122-p0507-p1441 it died on way home and wont start. is...

You can test the MAF before replacing. It may be a problem with the circuit itself or just a fluke from another problem that is connected to this sensor.

There are two basic types of mass airflow sensors: hot wire and hot film. In the first type, a very thin wire (about 0.2 mm thick) is used as the heated element.
f27-31.gif Components of a hot wire-type mass airflow sensor. Courtesy of Ford Motor Company. The element temperature is set at 100° to 200°C above incoming air temperature. Each time the ignition switch is turned to the off position, the wire is heated to approximately 1,000°C for 1 second to burn off any accumulated dust and contaminants.
The second type uses a nickel foil sensor, which is kept 75°C above ambient air temperatures. It does not require a burn-off period and therefore is potentially longer lasting than the hot wire type.
A faulty MAF will cause driveability problems resulting from incorrect ignition timing and improper air/fuel ratios.
Vane-type MAF Sensors
A vane-type MAF sensor is found on many import and domestic vehicles with EFI. All intake air must flow through the sensor. Some MAF sensors are called volume air flow meters
  • Begin checking a vane-type MAF sensor by checking the voltage supply wire and the ground wire to the MAF module before checking the sensor voltage signal.
  • Always follow the recommended test procedure in the manufacturer's service manual and use the specifications supplied by the manufacturer.
  • Typically, to test the sensor, a digital multimeter (DMM) is used and set on a DC voltage scale. The negative meter lead is connected to ground and the red lead to the MAF signal wire.
f_32.44.gif A voltmeter connected to measure the signal from a MAF sensor. Reproduced with permission from Fluke Corporation.
  • Turn on the ignition switch and press the min/max button, if available, on the DMM.
  • Slowly push the MAF vane from the closed to the wide-open position, and allow the vane to slowly return to the closed position.
f_27.33.gif Move the MAF sensor air vane from open to close to test it. Reproduced with permission from Fluke Corporation.
  • Observe the maximum and minimum voltage readings as the vane was moved.
  • If the minimum voltage signal is zero, there may be an open circuit in the MAF sensor variable resistor.
  • When the voltage signal is not within the manufacturer's specifications, replace the sensor.
WARNING While pushing the mass air flow sensor vane open and closed, be careful not to mark or damage the vane or sensor housing.
  • Some vehicle manufacturers specify ohmmeter tests for the MAF sensor.
  • With the MAF sensor removed, connect the ohmmeter across the sensor's output and input terminals.
f_32.45.gif Ohmmeter connections to a MAF sensor. Reprinted with permission.
  • The resistance at these terminals is normally 200 to 600 ohms.
  • Connect the ohmmeter leads to the specified MAF sensor terminals, and move the vane from the fully closed to the fully open position.
  • With each specified meter connection and vane position, the ohmmeter should indicate the specified resistance.
f_32.46.gif Resistance specifications for a typical MAF sensor with door open and closed. Reprinted with permission.
  • When the ohmmeter leads are connected to the sensor's input and output terminals, the ohmmeter reading should increase smoothly as the sensor vane is opened and closed.
  • To check a vane-type MAF with a lab scope, connect the positive lead to the output signal terminal and the negative scope lead to a good ground.
  • This type MAF should display an analog voltage signal when the engine is accelerated. A defective MAF will have sudden and erratic voltage changes.
f_32.47.gif The trace of a defective vane-type MAF sensor. Reproduced with permission from Fluke Corporation. Hot-Wire-Type MAF Sensors
The test procedure for heated resistor and hot-wire MAF sensors varies depending on the vehicle make and year. Always follow the test procedure in the appropriate service manual. A frequency test may be performed on some MAF sensors, such as the AC Delco MAF on some General Motors' products.
  • To check the MAF sensor's voltage signal and frequency, connect a voltmeter across the MAF voltage signal wire and ground wire.
  • Start the engine and observe the voltmeter reading.
  • On some MAF sensors, this reading should be 2.5 volts.
  • Lightly tap the MAF sensor housing with a screwdriver handle and watch the voltmeter pointer.
  • If the pointer fluctuates or the engine misfires, replace the MAF sensor.
  • Some MAF sensors have experienced loose internal connections, which cause erratic voltage signals and engine misfiring and surging.
  • Set the DMM so that it can read the frequency of DC voltage.
  • With it still connected to the signal wire and ground, the meter should read about 30 Hz with the engine idling.
  • Now, increase the engine speed, and record the meter reading at various speeds.
  • Graph the frequency readings. The MAF sensor frequency should increase smoothly and gradually in relation to engine speed.
  • If the MAF sensor frequency reading is erratic, replace the sensor.
f_32..48.gif Satisfactory and unsatisfactory MAF sensor frequency readings. Reproduced with permission from Fluke Corporation.
  • When a scanner is used to diagnose a General Motors' vehicle, one test mode displays grams per second from the MAF sensor. This mode provides an accurate test of the MAF sensor.
  • The grams per second reading should be 4 to 7 with the engine idling.
  • This reading should gradually increase as the engine speed increases.
  • When the engine speed is constant, the grams-per-second reading should remain constant.
  • If the grams-per-second reading is erratic at a constant engine speed or if this reading varies when the sensor is tapped lightly, the sensor is defective.
  • A MAF sensor fault code may not be present with an erratic grams-per-second reading, but the erratic reading indicates a defective sensor.
  • Frequency-varying types of MAF sensors can be tested with a lab scope.
  • The waveform should appear as a series of square waves.
f_32.49.gif A normal trace for a frequency-varying MAF sensor. Courtesy of Progressive Diagnostics--WaveFile AutoPro.
  • When the engine speed and intake air flow increases, the frequency of the MAF sensor signals should increase smoothly and proportionately to the change in engine speed.
  • If the MAF or connecting wires is defective, the trace will show an erratic change in frequency.
f_32.50.gif The trace of a defective frequency-varying MAF sensor. Courtesy of EDGE Diagnostics Systems.

There is also a
Mass Air Flow (MAF) Burn-Off Module Operation:
00375_maf_burn_off_module.jpgA semi-conductor control for an electronic-ignition system.

Nov 17, 2009 | Pontiac Grand Prix Cars & Trucks

1 Answer

Wipers wont always turn on

Could be the motor. The "park" portion is controlled by the motor.
You need to use a meter to test voltage to determine if the switch is feeding the motor.

Oct 05, 2009 | 1998 GMC Sonoma

1 Answer

How we can increase the frequency of a AQC signal

dear friend-the frequency can not be increase unless you change the desighn.

Jun 30, 2009 | Hyundai Motor 2004 Sonata

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