1: Introduction to PicoScope Off Highway Diagnostics

Six videos on Off-Highway Diagnostics with PicoScope.

The first is an introduction to PicoScope Off-highway Kits being used to diagnose a range of common problems found with Off Road machinery. See the PicoScope Off-Highway Kits for more details and pricing on the kits from Garage Lube.

Running time: 47min 33sec.

2: Diesel Diagnostics (Part 1)

PicoScope being used to diagnose problems with diesel engines in off-road vehicles (Part 1). Firstly, we look at injector current and voltage waveforms.

Secondly, we test of a Denoxtronic system operation and shutdown. During shutdown, the 'adblue' fluid is automatically withdrawn from the system to prevent freezing.

Running time: 22min 45sec.

3: Diesel Diagnostics (Part 2)

PicoScope being used to diagnose problems with diesel engines in off-road vehicles (Part 2).

Misfire!

The first test is misfire detection. In the guided test a camshaft sensor was used. this has been replaced by a current clamp measuring injector current as a cylinder identifier. The crankshaft sensor, the current clamp measuring injector current combined with fuel rail pressure are examined.

The crank speed is calculated using a maths channel. Notice how the engine accelerates as each cylinder fires. Any missing 'accelerations' indicate a misfire.

Learn how to reduce sensor noise by filtering and appropriate grounding. Notice the difference between the guided test crank signal vs the hall effect sensor in the vehicle under test.

J1939 CAN

The second test shows you how to analyse a CAN network in an off-highway vehicle. Also see our CAN Bus Testing and Decoding Videos for more on this subject. Note that off-road vehicles typically use J1939 protocol as opposed to cars that use J2534. This test highlights the differences between the protocols. J1939 which is very standardised, when properly understood and decoded, can assist you in identifying problems. PicoScope now has a J1939 Decoder.

Here is a link to isobus.net mentioned in the video which lists standard Source Addresses and PGNs.

Running time: 32min 29sec.

4: Hydraulics Testing

PicoScope being used to diagnose problems with hydraulics in off-road vehicles.

Running time: 32min 29sec.

5: Preventative Maintenance

PicoScope being used for Preventative Maintenance (PM) in off-road vehicles.

Running time: 22min 28sec.

6: Hydraulic Testing

PicoScope being to test hydraulics in off-road vehicles. Ben starts by testing hydraulic pressure using a WPS600S whilst monitoring crank-shaft speed. He shows how the engine speed changes with variations of hydraulic load and uses the high speed capability of the WPS600S pressure sensor to monitor hydraulic pump pressure pulsations.

Jon and Ben then discuss Pico flow-meters (please contact us if you are interested in these flow-meters). The WPS600S and a flow-meter are applied to testing hydraulic pumps, viewing the PQ curve in XY mode to plot the relationship between flow and pressure using the flow-meter's built-in restrictor, which creates a hydraulic load. The flow-meter also measures the temperature of the oil and as load is applied, the temperature increases.

Ben uses Pico to diagnose a simple fault on an old Kubota Mini Digger where the customer complained of limited hydraulic power. Ben used an optical sensor to measure crank-shaft speed. Hydraulic pressure was lower than expected.

Running time: 33min 50sec.