[FIXED] 2016 Ford Expedition No Crank
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Nissan Technician
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"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."
I have learned more by being wrong, than I have by being right.
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abe1204 wrote: .... but i dnt know the exact reason why is the ABS MODULE and Pcm are not communicating when theres i light on the dash board,,
I still believe that what you have there (in probability order) is a wiring problem between PCM and ABS module, but also it can be the ABS module itself or the PCM or BCM (but less likely).
Normally the engine should not start when you have miscommunication between PCM and ABS.
Based on what you said, when you have light in the dashboard, there is no comm between PCM and ABS and your engine (normally) should not start. Is this right? or I'm wrong?
In order to diagnose no comm to ABS, first, you have to check the CANBus network and this must be done when the defect is present (when you have light on dash). If the defect is intermittent, then must wait until is present. When the defect is intermittent, then it is very important that once it is present to try to take care that the car will not be moved, hitted or brutalized in any way during the measurements, that can cause the defect to disappear.
1. Disconnect the battery and leave for 5 minutes.
2. Put an ohmmeter between PIN 4 and 5. Your measure should not be higher than 0.2 ohms. Measure also the resistance between car's body and PIN 4 which is ground.
3. Put an ohmmeter between PIN 6 and 14. Your measure should be around 60 ohms +/- max 10%.
3. Connect the battery.
4. Measure the voltage between PIN 6 and 5. Should be around 2.5-3.5V
5. Measure the voltage between PIN 14 and 5. It should be around 1.5-2.5V. Do the last two measurements with key contact ON and OFF and as you can see the values are pretty useless because two different voltmeters will have different results in the same car, but it can give us a clue about what is happening there.
After you did all these steps, tell me what you have so we can go further.
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