Log In

Celebrating 36 Years

Follow us on Facebook for all the latest news, updates and promotions

 

call 9 - 5 PST

 

CAN Test Box

can test box

 

Continuing with our mission to make vehicle diagnostics easier and faster…the new CAN Test Box gives you easy access to the 16 pins of the diagnostic connector that is fitted to all modern vehicles. Depending on the configuration of the vehicle, this may allow you to check power, ground and CAN Bus signal quality. With the test leads supplied you can connect your PicoScope lab scope to the CAN Test Box to monitor signals such as the CAN High and Low. More.....

Attention all
Automotive Scope Users


Pico Automotive Scope software now sports a new Waveform Library browser.
Must own PicoScope to view.
See details here

 

Just Posted
 10 - NVH Tutorials

We have just posted 10 outstanding tutorials on how to use the Pico NVH (Noise, Vibration and Harshness) diagnostic system.

If you are a user of NVH or Planning to aquire an NVH System, check out these 10 tutorials .

Landing Page at this link

Credit Cards Accepted

 

website security

BMW 318i Not Starting
Picoscope Logo 
By Andy Cape, Cape Auto Diagnostics, Cape Town   

The vehicle

  • 2000 BMW E46 318i
  • BMS46 Engine Control
  • Engine Code M43TU

The problem

The vehicle had been driven through a flooded area, and water had entered the block via the air intake. The car cut out with the engine flooded with water. The cold water entered the hot cylinder block, and caused it to crack due to thermal shock. The engine had been replaced, but could not be started. The vehicle was towed to our garage, but we soon discovered that no diagnostic scan could be performed due to no communication to the modules.

The investigation

After a thorough investigation of the relevant fuses, checking supply voltages, ground (earth) signals, immobilizer signals, and the primary ignition voltage, we discovered that:

  • The primary ignition was being supplied with 12 V, but the ECU was not triggering the coils, which resulted in no spark being produced.
  • The relevant fuses were intact.
  • The immobilizer signal was available as soon as the ignition key was turned and therefore was not at fault (see Figure 1).
  • The Crankshaft Sensor did not deliver a valid signal. The power supply for the sensor was only 500 mV once the car was started. (see Figures 2 and 3).
figure 1

Figure 1: A good signal from the immobiliser to the ECU

figure 2

Figure 2: Blue = Crank shaft sensor, Red = Hall sensor supply (should be 12 V)

figure 3

Figure 3: The crank shaft signals zoomed

The solution

We checked the wiring of the crank shaft sensor and could not find any faults. The sensor itself had been replaced by the client already. We did notice that without the sensor connected - there was no sufficient power supply to the sensor from the ECU. This led us to believe the ECU must be faulty.

The result

We opened the ECU and found the proof. The power connector was destroyed by extreme overload (see Figure 4). We were confused as to why the fuses did not trip to protect the ECU.

figure 4

Figure 4: ECU with damanged power connector

< back

 
 
 
USA Office

Tel:1.877.902.2979-1.425.223.4311
Fax:1.877.329.4324
Address: 1480 Gulf Road, Suite 837,
PO Box 1280
Point Roberts, WA 98281

Western Canada - Vancouver BC

Tel:1.800.663.6001 or 1.604.925.6150
Fax:1.604.925.6170
Address: 2454 Haywood Ave
West Vancouver, BC V7V 1Y1

Eastern Canada - Markham, Ontario

Tel:1.800.465.0164 or 1.905.513.7027
Fax:1.877.329.4324
Address: 3075 14th Ave, Unit 219,
Markham, Ontario L3R 0G9