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Old 09-08-19, 06:14 PM   #1
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Default Do I have a Faulty ECU

Hi all,

I would like some advice on the following.

Condition: Crank non start Planet showing the following ECU faults:
1. Injector control Fault on the harness or on the injector
2. Turbo pressure signal Incorrect manifold pressure/ atmospheric pressure
3. EGR valve circuit Position repeat voltage to high
4. Pre/post heating relay circuit relay not controlled and spark plugs supplied
5. Fuel pressure signal pressure change coherence
6. Fuel pressure signal pressure change coherence
7. Fuel pressure signal open circuit or short circuit to +ve
8. Differential exhaust pressure signal open fault of short circuit to earth
9. Diesel flow regulator signal coherence
10. Cooling circuit bypass valve solenoid valve circuit short circuit between two wires or a short circuit to positive

Orginally diagnosed with low fuel pressure at 47 bar the pump was confrimed as failling by a diesel specialist so was reconed and a new fuel regulator fitted as well. Still only had 47 Bar so changed the fuel sensor. checked the harness for powers and grounds 5v ref present 0v when pluged in, signal wire 2.62v. Fuel pressure now a heathy 300 Bar on crank but still non start.

Looking at the first fault Ive cheched for voltage at the injectors with the following results: 1,4 1.5v 2,3 0v, this should be plus 12v. What I would like to do is confirm the voltage at the ECU to confirm wether this is a harness issue or thre ECU but Im unsure which pins and what Im looking for. confirmation of 12v leaving the ECU is what Im looking for.

I have reset the BSI all the bells and whistles appear to be working.

My feeling is that the ECU has gone faulty as the vehicle has been a non start for a long time. Externally there is visable corrosion on the top of the ECU.

ECU Simens 803

I do have access to pico for more in depth testing if required aswell as a test light.

I do have Diagbox but its been playing up.

I look forward to your advice.
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Old 09-08-19, 06:55 PM   #2
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Unplug egr clear codes and see what happens. Not sure if it restricted to Bosch ECU but some models had issues with shorted power feed to various sensors caused by a faulty EGR

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Old 09-08-19, 08:31 PM   #3
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Thanks Windy for the quick response,

I will check tomorrow weather permitting and report back.
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Old 10-08-19, 07:36 PM   #4
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Gut feeling: faulty ECU sounds implausible.

If you clear the faults then do some refuse to clear?

What additional faults come back after trying to start?
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Old 12-08-19, 08:44 AM   #5
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Cleared the codes and the following came back:

P1197 Injector control Fault on the harness or on the injector
P1164 Fuel Pressure Signal
P0406 EGR(Unplugged)
P1351 Pre/post heating circuit

The first two faults are of concern. As I described I dont have battery voltage at the injectors so I would like to confirm battery voltage leaving the ECU but Im not sure where on the ecu to test.

As for the fuel pressure the fuel reference is 350 and the messured is now 1098 on crank which I believe is to high. This is a new fuel rail sensor but I will retest the circuit to confirm.

My understanding is that if the ECU sees low/high pressure it will not signal the injectors does that mean it will not allow battery voltage to the injectors??

I look forward to your guidence
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Old 12-08-19, 04:32 PM   #6
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Spent the afternoon checking the injector harness for continuity and resistance and no faults found. I did manage to get hold of the pinout diagrame for the ECU. I can now confirm that there is no battery voltage leaving the ECU on the injector circuit. I believe there should be battery voltage at both ends!!
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Old 12-08-19, 10:04 PM   #7
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Some designs connect one of the injectors terminals to +ve, and the ECU switches earth to the other terminals.
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Old 12-08-19, 10:10 PM   #8
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Ok but I should still be seeing battery voltage??
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Old 13-08-19, 06:26 AM   #9
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You should see it when an injector is told to operate. The engine has to be turning for this to happen. The pulses are brief, so an oscilloscope or something to detect pulses would be required. What are you testing with?

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Old 13-08-19, 05:34 PM   #10
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Ive been using a voltmeter ill change to my pico scope for a more pricise look but just to confirm theres only voltage when commanded by the ECU.
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