UNI-T UT105 Operating Manual Download | Manualshive

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Table of Contents

Title Page

Overview
Unpacking Inspection
Safety Information
Rules For Safe Operation
Automotive Servicing Safety Guide
International Electrical Symbols
The Meter Structure
Rotary Switch
Functional Buttons
Display Symbols
Measurement Operation
Part 1 Multimeter Basic Testing
A. AC and DC Voltage Testing
B. DC Current Testing
C. Resistance Testing
D. Diode Testing
E. Continuity Testing
F. Dwell Testing
G. Engine Tach (Rotation Speed)
Testing “RPMx10”
H. Data Holding
Part 2 Diagnosis of Automotive Troubles
A. Fuse Testing: Check the fuse to
see if it is blown out.
B. Switch Testing: Check the switch
to see if it can work correctly.
C. Solenoid or Relay Testing
D. Starting/Charging System Testing
E. Battery Power Consumption Testing
when the Engine Is off
F. Trigger Voltage Battery Load Testing
G. Voltage Drop Testing

Model UT105: OPERATING MANUAL

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Summary of Contents for UT105

Page 1: ... Diode Testing E Continuity Testing F Dwell Testing G Engine Tach Rotation Speed Testing RPMx10 H Data Holding Part 2 Diagnosis of Automotive Troubles A Fuse Testing Check the fuse to see if it is blown out B Switch Testing Check the switch to see if it can work correctly C Solenoid or Relay Testing D Starting Charging System Testing E Battery Power Consumption Testing when the Engine Is off F Tri...

Page 2: ...sor 2 Temperature Sensor 3 Position Sensor 4 Absolute Pressure MAP and Baro Sensor 5 Mass Air Flow MAF Sensor General Specifications Accurate Specifications A DC Voltage B AC Voltage C DC Current D Resistance E Diode F Continuity Testing G Dwell Testing H Tach Rotation Speed Testing Maintenance A General Services B Replacing the Fuses C Replacing the Battery 33 34 34 35 36 37 38 39 40 41 43 44 45 ...

Page 3: ...T105 Meter is a manual testing automotive digital Multimeter Spotting a unique design with an extra large screen this meter has useful features such as a fully functional symbol display connect prompt and full testing overload protection For this reason it emerges as an electric Meter with more outstanding performance for safer operation than other Meters In addition to the automotive dwell and ta...

Page 4: ...diately 9V Battery NEDA 1604 6F22 or 006P Open the package case and take out the Meter Check the following items carefully to see any missing or damaged part Model UT105 OPERATING MANUAL 4 Item 1 2 3 4 Description English Operating Manual Test Lead Alligator Clip Qty 1 piece 1 pair 1 pair 1 piece ...

Page 5: ... etc with smaller transient overvoltages than CAT III CAT III Distribution level fixed installation with smaller transient overvoltages than CAT IV Use the Meter only as specified in this operating manual otherwise the protection provided by the Meter may be impaired International electrical symbols used on the Meter and in this Operating Manual are explained on page 11 Model UT105 OPERATING MANUA...

Page 6: ...eter working at an effective voltage over 60V in DC or 30V in AC special care should be taken for there is danger of electric shock l Use the proper terminals function and range for your measurements l The rotary switch should be placed in the right position and no any changeover of range shall be made during measurement is conducted to prevent damage of the Meter l Disconnect circuit power and di...

Page 7: ...Rules For Safe Operation 2 Model UT105 OPERATING MANUAL 7 ...

Page 8: ...Model UT105 OPERATING MANUAL 8 ...

Page 9: ...he local retailers of automotive components 3 Contact the local libraries to look up any book for the proofreading of your automotive servicing manual so as to provide you with the latest information B Before the diagnosis of any trouble open the engine hood to make a thorough visual inspection You will find the causes for many of your problems to be solved which will save you a lot of time 1 Has ...

Page 10: ...end crack fracture or damage 7 Check the leads any connection of sharp edges connection of hot surfaces such as exhaust manifold shrinkage burn or scratch at the insulation or right line connection 8 Check circuit connections any pin corrosion bend or damage inappropriate connection position or damaged electrode lead Automotive Servicing Safety Guide 3 Model UT105 OPERATING MANUAL 10 ...

Page 11: ... Electrical Symbols AC Alternating Current Grounding Double Insulated Deficiency of Built In Battery Fuse Warning Refer to the Operating Manual Conforms to Standards of European Union Model UT105 OPERATING MANUAL 11 ...

Page 12: ...The Meter Structure see figure 1 1 LCD display 2 Data Hold button 3 Rotary Switch 4 Input Terminals 5 Power button figure 1 Model UT105 OPERATING MANUAL 12 ...

Page 13: ...surement Diode test Continuity test Resistance measurement V V A Automotive engine tach rotation speed testing Displayed Reading x 10 Unit rpm RPM x 10 DWELL Automotive ignition dwell testing Unit degree Below table indicated for information about the rotary switch positions Model UT105 OPERATING MANUAL 13 ...

Page 14: ... about the functional button operations AC voltage measurement Turn the power on and off l Press HOLD once to enter hold mode l Press HOLD again to exit hold mode and the present value is shown l In Hold mode is displayed HOLD Model UT105 OPERATING MANUAL 14 ...

Page 15: ...y replace the battery as soon as the battery indicator appears 2 Indicates negative reading 4 Test of diode 5 The continuity buzzer is on 6 Date hold is active 7 Indicator for AC voltage or current The displayed value is the mean value 3 AC Connect Terminal Indicator of connecting test leads into different input terminals Model UT105 OPERATING MANUAL 15 1 2 3 4 5 6 7 8 ...

Page 16: ... x 106 or 1 000 000 ohms mA A A Amperes amps The unit of current mA Milliamp 1 x 10 3 or 0 001 amperes V Volts The unit of voltage mV Millivolt 1 x 10 3 or 0 001 volts No Symbol Meaning 8 Ω kΩ MΩ mV V 4CYL 6CYL 8CYL DWELL Test of Dwell RPM x10 Tach x 10 Number of cylinders Model UT105 OPERATING MANUAL 16 ...

Page 17: ...he DC voltage ranges are 200 0mV 2 000V 20 00V 200 0V and 1000V The AC voltage ranges are 2 000V 20 00V 200 0V and 750V To measure DC or AC voltage connect the Meter as follows 1 Insert the red test lead into the V terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in V or V 3 Connect the test leads across with the object being mea...

Page 18: ...nput impedance of approx 10MΩ This loading effect can cause measurement errors in high impedance circuits If the circuit impedance is less than or equal to 10kΩ the error is negligible 0 1 or less When DC voltage measurement has been completed disconnect the connection between the testing leads and the circuit under test B DC Current Testing see figure 4 Warning Never attempt an in circuit current...

Page 19: ...opriate measurement position in A r 4 Break the current path to be tested Connect the red test lead to the more positive side of the break and the black test lead to the more negative side of the break 5 Turn on power to the circuit The measured value shows on the display Note l If the value of current to be measured is unknown use the maximum measurement position 10A and 10A terminal and reduce t...

Page 20: ...t voltage between terminals and ground is greater than 60V DC or 30V AC rms The resistance ranges are 200 0Ω 2 000kΩ 20 00kΩ 200 0kΩ 2 000MΩand 20 00MΩ To measure resistance connect the Meter as follows 1 Insert the red test lead into the Ω terminal and the black test lead into the COM terminal 2 Set the rotary switch to an appropriate measurement position in Ω range 3 Connect the test leads acros...

Page 21: ...ings of resistance l When the resistance reading 0 5Ωin the short circuit condition please check for loose test leads or other reasons l For high resistance 1MΩ it is normal taking several seconds to obtain a stable reading and it is better to choose shorter test lead l When there is no input for example in open circuit condition the Meter displays 1 l When resistance measurement has been complete...

Page 22: ...8V To test a diode out of a circuit connect the Meter as follows 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 For forward voltage drop readings on any semiconductor component place the red test lead on the component s anode and place the black test lead on the component s cathode The measured value shows on the display Note...

Page 23: ...he open circuit voltage between terminals and ground is greater than 60V DC or 30V AC rms To test for continuity connect the Meter as below 1 Insert the red test lead into the terminal and the black test lead into the COM terminal 2 Set the rotary switch to 3 Connect the test leads across with the object being measured The buzzer does not sound when the resistance value is 50 The circuit is discon...

Page 24: ...tion the dwell testing can also be used to test a mixed controlled solenoid e g GM feedback carburetor 1 Set the rotary switch to DWELL 2 As prompted at the LCD connect terminal insert the red test lead into the terminal and the black test lead into the COM terminal Connect the ends to be tested as illustrated l If the cut off switch of an ignition system is tested connect the red test lead probe ...

Page 25: ...black test lead probe to the good ground terminal of the automobile 4 Read the ignition dwell of the tested automobile directly from the display G Engine Tach Rotation Speed Testing RPMx10 see figure 8 figure 8 The RPM means the rotating frequency of the main shaft of the engine per minute 1 Set the rotary switch to RPMx10 2 As prompted at the LCD connect terminal insert the red test lead into the...

Page 26: ... 4 Upon the start of the engine or during its operation test the rotation speed of the engine and read the displayed value from the display The actual rotation speed of the automobile to be tested should be equal to the displayed value multiplied by 10 For example the actual rotation speed of the engine of the automobile should be 2000 RPM 200 x 10 if the displayed value is 200 and the meter is se...

Page 27: ...e reading of the meter should be displayed between 0 2Ωand 0 5Ω If it is more than 0 5Ω check the test leads to see whether they are well connected 4 Connect the red and black test lead probes in parallel to the two ends of the fuse when the reading of the meter should be displayed less than 10Ω indicating that the fuse is good When the display is overload 1 it is shown that the fuse has been blow...

Page 28: ...rking of the contacts The solenoid may be stuck when the coil is in an on position Therefore some potential problems cannot be found in testing D Starting Charging System Testing The on off package of the engine starting system consists of a battery engine starting button solenoid and relay starting buttons lead connections and lines During the operation of the engine the charging system keeps the...

Page 29: ...Measurement Operation 13 2 The testing results are shown in contrast as follows and if the battery is less than 100 please use it after charging it E Battery Power Consumption Testing when the Engine Is off The test is carried out to find the amperage of the power consumption of the battery when both the ignition key and the engine are off The test is helpful for the determination of the additiona...

Page 30: ......

Page 31: ...nnector Any abnormal voltage drop generally results from an additional resistance The resistance will restrict the currents upon the start of the engine leading to the reduction of the load voltage of the battery and the slow down of the start of the engine 1 Cut off the ignition system so as to disable the start of the automobile Cut off the main ignition coil shunt coil cam and starting sensor s...

Page 32: ...n figure 9 Test the voltage between any of the following pairs of points respectively 1 2 2 3 4 5 5 6 6 7 7 8 8 9 8 10 Component Voltage Switch 300 mV Lead 200 mV Grounding 100 mV Battery Lead Connector 50 mV Wiring 0 0 V Compare the readings of the tested voltages against the said table If the voltage is on the high side check the components and connectors to see if there is anything wrong If any...

Page 33: ...l the accessories with the normal voltage readings being 13 2 V to 15 2 v 4 Open the throttle and control the rotation speed of the engine between 1800 RPM and 2800 RPM The voltage readings should be consistent with those in 3 with the difference being no more than 0 5 V 5 Turn on the lamps windshield wipers fans and so on to increase the loads of the electronic systems with the voltage readings b...

Page 34: ...black test lead probes Their short circuit resistance should be less than 0 5Ω If it is more check the test lead to see if it is loose or damaged If it is damaged replace it with a new one 4 Connect the red test lead probe to the primary pole of the ignition coil and the black one to the primary pole of the coil see figure 10 See the detailed positions in various kinds of automotive manuals Second...

Page 35: ...o 30 kΩ Refer to various kinds of automotive manuals for the details 8 For a heater ignition coil repeat the said testing steps Note For a heater ignition coil the resistance may be a little higher because the resistance of a coil will vary with the temperatures The higher the temperature the higher the resistance will be and vice versa 2 Ignition System High Voltage Damper Testing see figure 11 1...

Page 36: ...ead into the Ω terminal and the black one into the COM terminal 3 Connect the red and black test lead probes in parallel to the two ends of the high voltage damper and observe the reading The normal resistance is generally in a range of 3 kΩ to 50 kΩ In bending the lead the reading should remain unchanged 3 Hall Switch Sensor Testing see figure 12 When the tach and dwell are tested in the computer...

Page 37: ... Set the rotary switch of the meter to 200Ω As prompted at the LCD connect terminal insert the red test lead into the Ω terminal and the black one into the COM terminal 4 Connect the red and black test lead probes in parallel to the signal connect terminal and ground end of the sensor and the Meter should display a small ohm value 5 When a metal plate blade steel tape etc is inserted into a concav...

Page 38: ...tomobile to be tested 2 As prompted at the LCD connect terminal insert the red test lead into the terminal and the black one into the COM terminal 3 Connect the black test lead probe to the ground i e ground strap connection of the automobile and the red one to the appropriate testing test terminal of the computer of the automobile if the automobile is in a DIS type Refer to the servicing handbook...

Page 39: ... controlled carburetor and fuel injection so as to achieve lower fuel injection 1 GM General Motor Testing the dwell of the C 3 mixed control solenoid Place the solenoid in a cylinder monitoring the ratio between the air and the fuel which should generally be 14 7 to 1 between the air and the fuel so as to reduce the injection of surplus fuel The testing is used to see if the solenoid is installed...

Page 40: ... the resistance of an ignition coil A Cut the electric link off the injector Refer to the servicing handbooks of various kinds of automotive manuals for the detailed position B Connect the red and black test lead probes to the two ends of the injector The general normal resistance is less than or equal to 10Ω J Engine Sensor Testing see figure 16 ...

Page 41: ...h voltage low resistance means a too low oxygen content The computer regulates the ratio between the air and the fuel according to the high or low voltage There are normally two types of oxygen sensors the zirconia and titania sensors Refer to the different external properties of the two types for the details Testing Procedure 1 Move the oxygen sensor out of the automobile 2 Set the rotary switch ...

Page 42: ...rt the red test lead into the V terminal and insert the black test lead into the COM terminal The titania sensor is tested with the 200kΩ As prompted at the LCD connect terminal insert the red test lead into the Ω terminal and insert the black test lead into the COM terminal Secure the sensor with a table vice light up the propane burner and add a heat sensor terminal Make its temperature about 66...

Page 43: ...sensor is the lower the resistance becomes The temperature sensor is generally used in engine braking air ventilation flow fuel temperature and other equipment Testing Procedure 1 The same as in the resistance testing method 2 When the general temperature of a heating sensor rises its resistance will drop The thermal resistance of the temperature sensor of the automotive engine is generally less t...

Page 44: ...direction of a mechanical device The typical position sensors include throttle exhaust recirculating EGR blade air flow and other sensors Testing Procedure 1 The same as in the resistance testing method 2 Connect the red and black test lead probes respectively to the signal test terminal and ground terminal Refer to various kinds of automotive servicing manuals for its position and the resistance ...

Page 45: ...and Toyota use DC voltage type MAP sensors while Ford uses frequency type MAP sensors Refer to relevant manuals for other automotive manufacturers Testing Procedure 1 Connect the DC voltage type MAP sensor in the DC voltage testing method and set the rotary switch of the meter to 20 VDC 2 Connect the frequency type MAP sensor in the RPM x10 testing method and set the meter to the number of cylinde...

Page 46: ...alues DC Voltage Type Sensor In a vacuum state the displayed value is generally between 3 V and 5 V The details shall be based on the parameters furnished by the supplier Frequency Type Sensor In a vacuum state the displayed value is generally 4770 RPM 5 This only applies to the MAP sensor produced by Ford and the other sensors shall be based on the parameters furnished by the supplier Warning l T...

Page 47: ...the DC voltage type MAF sensor in the DC voltage testing method and set the rotary switch of the meter to 20VDC Connect the frequency type MAF sensor in the RPMx10 testing method and set the meter to the number of cylinders in the automobile Now take 4 cylinders 4CYL for example 2 Connect the black test lead probe of the meter to the ground terminal i e ground strap connection and connect the red ...

Page 48: ... the parameters furnished by the supplier Frequency Type Sensor In a vacuum state the displayed value should be 330 RPM 5 This only applies to GM low frequency sensors The other low frequency sensors shall be based on the parameters furnished by the supplier Warning l The reading becomes the actual RPM only after it is multiplied by 10 l Frequency RPM 30 This only applies to 4CYL ...

Page 49: ...y 75 0 o C to below 30 o C 50 30 o C to 40 o C l Altitude Operating 2000m Storage 10000m l Battery Type One piece of 9V NEDA1604 or 6F22 or 006P l Electromagnetic Compatibility In a radio field of 1 V m Overall Accuracy Specified Accuracy 5 of Range in a radio field of more than 1 V m no assigned accuracy is specified l Battery Deficiency Display l Negative reading Display l Overloading Display 1 ...

Page 50: ...ous 230VAC Remarks l Input impedance 10MΩ l Frequency response 40Hz 400Hz l Displays effective value of sine wave mean value response B AC Voltage 2V 20V 200V 750V Range Resolution 0 8 5 Overload Protection Accuracy 1mV 10mV 100mV 1V 1 0 4 1000 VDC or 750 VAC continuous C DC Current Remarks l At 10A Range For continuous measurement 10 seconds and interval time between 2 measurement greater than 15...

Page 51: ...te 2 7V l The silicon PN junction normal voltage is about 500 mV to 800 mV 1mV Range Resolution Overload Protection 600Vp E Diode Remarks l Open circuit voltage approximate 2 7V l The buzzer does not sound when the resistance value is 50Ω The circuit is disconnected l The buzzer sounds continuously when the resistance value is 30Ω The circuit is in good condition 1Ω Range Resolution Overload Prote...

Page 52: ... 0 5 mS in width Range Resolution Overload Protection Accuracy 4CYL 6CYL 8CYL 600 VP 0 1 o 3 5 H Tach Rotation Speed Testing Range Resolution Overload Protection Accuracy 4CYL 6CYL 8CYL 600 VP 10 RPM 3 5 Remarks l Input Amplitude More than or equal to 10 V in direct impulse more than or equal to 0 5 mS in width l Maximum Tach 10000 RPM Tach Displayed Reading x 10 ...

Page 53: ...e to the Meter do not get water inside the case A General Service l Periodically wipe the case with a damp cloth and mild detergent Do not use abrasives or solvents l To clean the terminals with cotton bar with detergent as dirt or moisture in the terminals can affect readings l Turn the Meter off when it is not in use and take out the battery when not using for a long time l Do not store the Mete...

Page 54: ...te the case top from the case bottom 4 Remove the fuse by gently prying one end loose then take out the fuse from its bracket 5 Install ONLY replacement fuses with the identical type and specification as follows and make sure the fuse is fixed firmly in the bracket Fuse 1 CE 315mA 250V fast type 5x20 mm Fuse 2 CE 10A 250V fast type 5x20 mm 6 Rejoin the case bottom and case top and reinstall the 3 ...

Page 55: ...n the Meter power off and remove all connections from the terminals 2 Take the Meter out from the holster 3 Remove the 3 screws from the case bottom and separate the case top from the case bottom 4 Remove the battery from the battery connector 5 Replace with a new 9V battery NEDA1604 6F22 or 006P 6 Rejoin the case bottom and case top and reinstall the 3 screws and the holster END This operating ma...

Page 56: ...N LIMITED Address Dong Fang Da Dao Bei Shan Dong Fang Industrial Development District Hu Men Town Dong Guan City Guang Dong Province China Headquarters Uni Trend International Limited Address Rm901 9 F Nanyang Plaza 57 Hung To Road Kwun Tong Kowloon Hong Kong Tel 852 2950 9168 Fax 852 2950 9303 Email info uni trend com http www uni trend com ...

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