Rover 75 diesel MK1. Engine warning light on, engine remains at 1200 rpm - Page 2

Orgiswing · 18th January 2018, 10:59

Sorry to invade you
Well, I'm getting scared.

Tested the wires. 5 with a resistance of 1.5 Ohm, and 1 infinity. Throttle pedal potentiometer and ECM disconnected.
Glad, I told myself that I found the fault.
I pass a flying wire between the ECU and the throttle sensor plug, correct resistance. happy

I reconnect the engine ECU and the pedal sensor with the flying wire, contact: indicator always on and especially, the fan that goes into high speed then stops.

I'm getting scared at my ECM. Yet perfectly dry.

Orgiswing · 19th January 2018, 13:11

Finally, I may have found.
I have redid my tests with good equipment, and it turns out that I have a circuit out of order.
I get resistance data between the various pedal sensor circuits, but I have the infinity between the green and white wires.
I will not be able to repair this before a moment for health problems.
I will give you news about this breakdown in two months.

Yorkshire GOC · 19th January 2018, 13:33

Quote:

Originally Posted by Orgiswing

Sorry to invade you
Well, I'm getting scared.

Tested the wires. 5 with a resistance of 1.5 Ohm, and 1 infinity. Throttle pedal potentiometer and ECM disconnected.
Glad, I told myself that I found the fault.
I pass a flying wire between the ECU and the throttle sensor plug, correct resistance. happy

I reconnect the engine ECU and the pedal sensor with the flying wire, contact: indicator always on and especially, the fan that goes into high speed then stops.

I'm getting scared at my ECM. Yet perfectly dry.

I would PM Marinabrian

for his view - am sure he will be of help in diagnosing your problem.

Orgiswing · 19th January 2018, 15:00

Thank you very much.
Finally, I redid the ohmmeter tests on both sensors. And this time correctly. ^^
There is good data comparing with a colleague's sensor, but there are two problems in my opinion.
-On a sensor, I have infinity accelerated thoroughly between the green wire and the white wire.
-On the other sensor, I have 1019 ohms at rest and 1820 ohms accelerated. While with the sensor of my colleague, we get 2730 and 2040. Big difference and reversed.

It seems to me that both are out of order.

Orgiswing · 13th March 2018, 09:57

I come back to you because I found the breakdown.

Not having changed the intake manifold seals while I disassembled several times, I realized that at the last reassembly, I crushed the sheath and the son of the high pressure sensor at the end of common rail.

This short-circuit makes the ECM believes that there is a problem with the accelerator pedal potentiometer and the engine goes into degraded mode with the speed blocked at 1250 rpm.

I'm as surprised as you, but it's a fact. And it is not indicated in the Rave.

scorpio · 13th March 2018, 12:31

Glad you found the problem, just goes to show that sometimes its not what the diagnostics say it is.

slovcan · 13th March 2018, 15:02

Thank you for coming back with the info! That WILL help someone else someday.

Cheers,
Glenn

Orgiswing · 13th March 2018, 15:16

Quote:

Originally Posted by slovcan

Thank you for coming back with the info! That WILL help someone else someday.

The purpose of a forum is sharing.

19th January 2018, 15:00	#14
Orgiswing Newbie Rover 75 Join Date: Nov 2008 Location: North seaside Posts: 18 Thanks: 1 Thanked 5 Times in 3 Posts	Thank you very much. Finally, I redid the ohmmeter tests on both sensors. And this time correctly. ^^ There is good data comparing with a colleague's sensor, but there are two problems in my opinion. -On a sensor, I have infinity accelerated thoroughly between the green wire and the white wire. -On the other sensor, I have 1019 ohms at rest and 1820 ohms accelerated. While with the sensor of my colleague, we get 2730 and 2040. Big difference and reversed. It seems to me that both are out of order. Last edited by Orgiswing; 13th March 2018 at 09:55..

13th March 2018, 09:57	#15
Orgiswing Newbie Rover 75 Join Date: Nov 2008 Location: North seaside Posts: 18 Thanks: 1 Thanked 5 Times in 3 Posts	Degraded mode, 1250 rpm I come back to you because I found the breakdown. Not having changed the intake manifold seals while I disassembled several times, I realized that at the last reassembly, I crushed the sheath and the son of the high pressure sensor at the end of common rail. This short-circuit makes the ECM believes that there is a problem with the accelerator pedal potentiometer and the engine goes into degraded mode with the speed blocked at 1250 rpm. I'm as surprised as you, but it's a fact. And it is not indicated in the Rave.

13th March 2018, 12:31	#16
scorpio Loves to post 75 Tourer zircon silver Join Date: Dec 2015 Location: Birmingham Posts: 270 Thanks: 47 Thanked 32 Times in 27 Posts	Glad you found the problem, just goes to show that sometimes its not what the diagnostics say it is. __________________ Peter Rover 75 Tourer Connoisseur CDT Auto Zircon Silver

13th March 2018, 15:02	#17
slovcan Gets stuck in 75 Tourer CDT MK2 manual in Glorious Grey Join Date: Jan 2018 Location: Slovakia Posts: 987 Thanks: 926 Thanked 346 Times in 252 Posts	Thank you for coming back with the info! That WILL help someone else someday. Cheers, Glenn __________________ Southern Slovakia Anything can happen in Formula 1 and usually does - Murray Walker 1999 Triumph Trophy 900, Saddlesore 1600, Iron Butt Riders Association #63720 2005 Rover 75 CDT Tourer MK2

18th January 2018, 10:59	#11
Orgiswing Newbie Rover 75 Join Date: Nov 2008 Location: North seaside Posts: 18 Thanks: 1 Thanked 5 Times in 3 Posts	Sorry to invade you Well, I'm getting scared. Tested the wires. 5 with a resistance of 1.5 Ohm, and 1 infinity. Throttle pedal potentiometer and ECM disconnected. Glad, I told myself that I found the fault. I pass a flying wire between the ECU and the throttle sensor plug, correct resistance. happy I reconnect the engine ECU and the pedal sensor with the flying wire, contact: indicator always on and especially, the fan that goes into high speed then stops. I'm getting scared at my ECM. Yet perfectly dry.

19th January 2018, 13:11	#12
Orgiswing Newbie Rover 75 Join Date: Nov 2008 Location: North seaside Posts: 18 Thanks: 1 Thanked 5 Times in 3 Posts	Finally, I may have found. I have redid my tests with good equipment, and it turns out that I have a circuit out of order. I get resistance data between the various pedal sensor circuits, but I have the infinity between the green and white wires. I will not be able to repair this before a moment for health problems. I will give you news about this breakdown in two months.