SEALEY VS925.V2 Lambda Sensor Tester Simulator Instruction Manual
- June 1, 2024
- SEALEY
Table of Contents
LAMBDA SENSOR TESTER/SIMULATOR
MODEL NO:VS925.V2
VS925.V2 Lambda Sensor Tester Simulator
Thank you for purchasing a Sealey product. Manufactured to a high standard,
this product will, if used according to these instructions, and properly
maintained, give you years of trouble free performance.
IPORTANT: PLEASE READ THESE INSTRUCTIONS CAREFULLY. NOTE THE SAFE
OPERATIONAL REQUIREMENTS, WARNINGS & CAUTIONS. USE THE PRODUCT CORRECTLY AND
WITH CARE FOR THE PURPOSE FOR WHICH IT IS INTENDED. FAILURE TO DO SO MAY CAUSE
DAMAGE AND/OR PERSONAL INJURY AND WILL INVALIDATE THE WARRANTY. KEEP THESE
INSTRUCTIONS SAFE FOR FUTURE USE.
| Refer to instruction manual
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| Wear eye protection
SAFETY
WARNING! Ensure Health and Safety, local authority and general workshop
practice regulations are adhered to when using tools.
DO NOT use tester if damaged.
Maintain tester in good and
clean condition for best and safest performance.
Ensure that a vehicle which has
been jacked up is adequately supported with axle stands.
Wear approved eye protection. A
full range of personal safety equipment is available from your Sealey
stockist.
Wear suitable clothing to avoid
snagging. Do not wear jewellery and tie back long hair.
Account for all tools and parts
being used and do not leave any on or near the engine.
Ensure the handbrake is applied
on the vehicle under test and if the vehicle has automatic transmission, put
it in the park position.
Always ensure there is adequate
ventilation when working with engine running. Emissions of carbon monoxide (if
inhaled) can cause serious damage to health.
WARNING! Lambda/O2 sensors are located within the exhaust system, when
working on them be well aware of extremes of heat.
INTRODUCTION
Tests Zirconia and Titania lambda sensors and ECU. Suitable for 1, 2, 3 and 4 wire sensors, heated and unheated. LED display shows crossover signal from sensor. Simulates rich or lean mixture signals to check ECU response. Insulation-piercing clip for quick and easy connection plus display to confirm wire identity. Features a low battery indicator and powered by 9V battery (supplied).
SPECIFICATION
Model No:……………………………………. VS925.V2
Battery………………………………………… 9V
Operating Temperature………………… 10°C to 50°C
Storage Temperature…………………….. 20°C to 60°C
Size (L x W x D)……………………………. 147x81x29mm
INDICATOR PANEL
The tester can indicate which wire on the Lambda sensor the unit is connected.
This tells the operator which is the signal wire for measuring the Lambda
output and also identifies the presence of the heater supply voltage (where
applicable) and the sensor ground condition.
OPERATION
NOTE: DEFAULT SETTING IS ZIRCONIA SENSOR MODE. TITANIA SENSOR MUST BE
MANUALLY SELECTED (see below) & THE RICH & LEAN VALUES ARE REVERSED.
4.1. SELECTING TITANIA
4.2. To select Titania mode, press the “ ” button while holding the “+ V”
button. When the tester turns on the Titania LED will illuminate. (fig.1)
NOTE: The engine must be at normal operating temperature and running at
1500-2000RPM to test the O2 sensor.
The tester is fitted with a wire-piercing clip allowing it to pierce the
sensor wires without damage, (the insulation reforms to its original state
after removal).
4.3. Switch on the tester by pressing the “ ” button. Connect the black
ground clip to a good chassis ground, or the negative terminal of the
vehicle’s battery. Connect the wire-piercing clip to one of the sensor wires.
The tester can test 1, 2, 3, and 4 sensor wires.
4.4. When testing 2, 3 or 4 wire sensors, the indicator panel (fig.1)
will identify which wire you are connected to.
4.5. If the top LED illuminates it indicates the clip is connected to the
heater supply voltage.
4.6. If the second LED illuminates this indicates a connection to the ECU
5V supply, (applicable in the case of Titania sensor, where fitted).
4.7. The open circuit LED will illuminate when the tester is switched on
but not connected to any sensor wires, if a bad connection is made to any if
the sensor wires this LED will stay lit. Once a good connection is made the
LED will go out, and one of the other LED’s will illuminate to indicate which
sensor wire is connected. When connection to the signal wire is made the
lights on the vertical display will go out, then the display LED array In the
Lambda window will activate. (fig.1).
4.8. A healthy sensor will show movement across the light path and will
illuminate the LEDs in the Lambda window. Once the Lambda window is
illuminated ignore any flickering of the LEDs in the indicator panel.
4.9. If connected in default (ZIRCONIA) mode, and only the top 2 lights
on the Lambda window are flickering, this could indicate a Titania sensor.
Leaving the unit connected to the signal wire, switch the unit off and follow
instructions for selecting Titania sensor. If the lights then show movement
across the Lambda window, this would then indicate a Titania sensor on the
vehicle.
TITANIA SENSOR (RICH & LEAN SIGNALS ARE REVERSED).
4.10. When a Lambda sensor is working correctly in good conditions this
will be shown in the Lambda Window with the LED array illuminating
continuously from lean to rich then back again (see fig.1). This pattern is
repeated constantly. If the sensor is not working correctly or there is a
fault with the ECU this will not occur and the LED array will remain in the
rich or lean sector of the display window, depending on the type of fault.
4.11. To identify the source of the fault, use the simulation feature of
the tester to introduce a rich or lean signal and observe whether this
produces a change in the LED activity on the Lambda window. Press +V (Titania,
press 0V) on the tester it will transmit a RICH signal to the ECU.
4.11.1. If the circuit is functioning correctly the mixture will be
weakened and the result should be apparent by a decrease in the engine speed
occurring. Ideally, a four-gas analyser should be used to verify that the
mixture strength varies in response to the false signals introduced.
4.11.2. If there is no reaction it would suggest a wiring/connection
problem or faulty ECU. Faulty fuelling, faulty ignition or faulty management
sensors (located on the engine) could also produce the same effect.
4.11.3. If there is a response to the simulated signal the Lambda sensor
should be checked, cleaned and tested, and replace or substitute if necessary.
4.12. In some car management systems, putting in a simulated signal may
appear as a fault code in the ECU memory when checked with a code reader.
4.13. Some management systems have a “limp home device” this is activated
when the Lambda sensor fails. The ECU will input a firm value signal of
approx. 500mV to the sensor to allow the vehicle to be driven at low speeds.
MAINTENANCE
5.1. The Lambda tester is a sensitive electronic instrument and should be
treated as such. Avoid high temperatures, mechanical shock and damp
environments. Check cables for damage and/or loose connections together with
battery replacement is the only required maintenance.
5.2. BATTERY REPLACEMENT
5.3. When the battery voltage is low the LED in the indicator panel will
illuminate.
4.2.1. Ensure the two clips are removed from the sensor wires and the
ground point.
4.2.2. Remove the battery cover on the rear of the tester by sliding in
the direction of the arrow.
4.2.3 Unplug the battery connector and replace with a battery of the same
type and rating, replace the battery cover ensuring it snaps into place.
ENVIRONMENT PROTECTION
Recycle unwanted materials instead of disposing of them as waste. All tools,
accessories and packaging should be sorted, taken to a recycling centre and
disposed of in a manner which is compatible with the environment. When the
product becomes completely unserviceable and requires disposal, drain any
fluids (if applicable) into approved containers and dispose of the product and
fluids according to local regulations.
REGISTER YOUR PURCHASE HERE
BATTERY INFORMATION
Under the Waste Batteries and Accumulators Regulations 2009, Jack Sealey Ltd
would like to inform the user that this product contains one or more
batteries.
WEEE REGULATIONS
Dispose of this product at the end of its working life in compliance with the
EU Directive on Waste Electrical and Electronic Equipment (WEEE). When the
product is no longer required, it must be disposed of in an environmentally
protective way. Contact your local solid waste authority for recycling
information.
Note: It is our policy to continually improve products and as such we
reserve the right to alter data, specifications and component parts without
prior notice. Please note that other versions of this product are available.
If you require documentation for alternative versions, please email or call
our technical team on
technical@sealey.co.uk or 01284 757505.
Important: No Liability is accepted for incorrect use of this product.
Warranty: Guarantee is 12 months from purchase date, proof of which is
required for any claim.
Sealey Group, Kempson Way, Suffolk Business Park,
Bury St Edmunds, Suffolk. IP32 7AR
01284 757500
sales@sealey.co.uk
www.sealey.co.uk
© Jack Sealey Limited
Original Language Version
VS926.V2 Issue: 2 (H,F) 31/05/23
Documents / Resources
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SEALEY VS925.V2 Lambda Sensor Tester
Simulator
[pdf] Instruction Manual
VS925.V2 Lambda Sensor Tester Simulator, VS925.V2, Lambda Sensor Tester
Simulator, Sensor Tester Simulator, Tester Simulator, Simulator
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