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nano5849
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There's a small issue I encountered while checking wiring that I am not able to understand.
Car Details.
Make: Renault
Model: Kwid Petrol AMT
Regarding the car, it has Automatic Transmission, type being Automatic Manual Transmission (AMT), essentially a Manual with clutch controlled by a Motor.
Problem.
The car does not shift to Reverse Gear (R), shifts into Drive (D) but does not go past 2nd Gear before the gear falls back into Neutral (N) and the power is lost. We have to wait for another 30 minutes or so and the car starts and again moves in limp mode, if we try to accelerate past 1st gear, it will fall into Neutral and wont shift to Drive and process repeats.
We scanned the car using Launch X431, it said "Clutch Motor Failures".
We moved onto checking wiring for Clutch Motor and here we encountered the issue, I have never seen this before. I'll start with basic description.
The car has a 6 PIN (Female) coupler for Clutch Motor, With 2 Pins for Clutch Motor Earth (Ground) and Clutch Motor Feed +12V) and the 6PIN Coupler is connected to ECM. Yes, the feed is not directly from Fuse Box. The other 4 Pins are for Clutch Position Sensor which are all working fine.
Issue.
The Ground pin for the Clutch Motor is good. The real issue is with the Clutch Motor Feed +12V) pin which reads the following voltage when checked using DMM, One lead is inserted into the Clutch Motor Feed pin, and other lead is put on the Main Terminal of Battery +12V) which should read 12V but actually reads ~10V and when the lead is put on the Ground Terminal of Battery (0V), it reads ~2V.
We had another model in the workshop, we compared the readings with that and the Voltage across the pin and Main Terminal read 12V and Ground read 0V.
The car doesn't have a separate TCM, everything is integrated into one single module for Engine Electronics and Transmission Electronics which I called ECM above.
Question.
I believe there is a partial short in the ECM, not really sure.
Does this mean, the issue is with ECM or can there be a fault in wiring as well?
Car Details.
Make: Renault
Model: Kwid Petrol AMT
Regarding the car, it has Automatic Transmission, type being Automatic Manual Transmission (AMT), essentially a Manual with clutch controlled by a Motor.
Problem.
The car does not shift to Reverse Gear (R), shifts into Drive (D) but does not go past 2nd Gear before the gear falls back into Neutral (N) and the power is lost. We have to wait for another 30 minutes or so and the car starts and again moves in limp mode, if we try to accelerate past 1st gear, it will fall into Neutral and wont shift to Drive and process repeats.
We scanned the car using Launch X431, it said "Clutch Motor Failures".
We moved onto checking wiring for Clutch Motor and here we encountered the issue, I have never seen this before. I'll start with basic description.
The car has a 6 PIN (Female) coupler for Clutch Motor, With 2 Pins for Clutch Motor Earth (Ground) and Clutch Motor Feed +12V) and the 6PIN Coupler is connected to ECM. Yes, the feed is not directly from Fuse Box. The other 4 Pins are for Clutch Position Sensor which are all working fine.
Issue.
The Ground pin for the Clutch Motor is good. The real issue is with the Clutch Motor Feed +12V) pin which reads the following voltage when checked using DMM, One lead is inserted into the Clutch Motor Feed pin, and other lead is put on the Main Terminal of Battery +12V) which should read 12V but actually reads ~10V and when the lead is put on the Ground Terminal of Battery (0V), it reads ~2V.
We had another model in the workshop, we compared the readings with that and the Voltage across the pin and Main Terminal read 12V and Ground read 0V.
The car doesn't have a separate TCM, everything is integrated into one single module for Engine Electronics and Transmission Electronics which I called ECM above.
Question.
I believe there is a partial short in the ECM, not really sure.
Does this mean, the issue is with ECM or can there be a fault in wiring as well?