E430 Limp mode
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Joined: Dec 2018
Posts: 2
From: Sydney Australia
E430 Limp mode
I purchased a 2001 E430 right hand drive sedan that was in limp mode.
Having done some research I purchased a conductor plate and filter and when I got the car home I fitted the conductor plate and filter, and the car was still in limp mode.
At this time I had ordered a scan tool but was waiting on its arrival.
I then purchased a electronic shift assembly and fitted it ( it was second hand and the wrecker I purchased it from could not guarantee it working as they cannot test electronic items just a 90 day return ) and this made no difference
The scan tool then arrived so I scanned the
1 engine ecu and the fault code P0702 was displayed ( the torque request from the control module is implausible )
2 The transmission control module . The Scan tool reported no communication with this module.
3 The electronic shift assemble. When running a diagnostic check on the shiftier it appears ok based on the following checks.
When moving from park ,reverse .neutral and drive the scan tool confirms the position. When moving from the tap up and tap down on the gear lever the scan tool confirms this. And moving from park to a gear the scan tool confirms the locking solenoid is functioning.
And finally command the reverse lights to come on works ok.
I them fitted a another transmission controller and can now communicate with the transmission controller when running a scan of modules.
Now when running a scan of the transmission controller I read the following codes.
1 Component has short circuit or no connection.
2 The selector lever is in an intermediate position.
3 Can communication with the engine system is faulty.
4 Component has occasional short circuit or no connection.
Now I have had a dual trace oscilloscope connected to both the high and low can bus and the signals look clean with no noise on the channels. The voltages also match up with what I have read .
I have also measured the valve body solenoids resistance at the actual connector for the transmission control unit. This all appeared ok.
Should I now be chasing a can issue even through it appears ok when looking at it with a dual trace cro,
Any help and other suggestion would be appreciated.
Having done some research I purchased a conductor plate and filter and when I got the car home I fitted the conductor plate and filter, and the car was still in limp mode.
At this time I had ordered a scan tool but was waiting on its arrival.
I then purchased a electronic shift assembly and fitted it ( it was second hand and the wrecker I purchased it from could not guarantee it working as they cannot test electronic items just a 90 day return ) and this made no difference
The scan tool then arrived so I scanned the
1 engine ecu and the fault code P0702 was displayed ( the torque request from the control module is implausible )
2 The transmission control module . The Scan tool reported no communication with this module.
3 The electronic shift assemble. When running a diagnostic check on the shiftier it appears ok based on the following checks.
When moving from park ,reverse .neutral and drive the scan tool confirms the position. When moving from the tap up and tap down on the gear lever the scan tool confirms this. And moving from park to a gear the scan tool confirms the locking solenoid is functioning.
And finally command the reverse lights to come on works ok.
I them fitted a another transmission controller and can now communicate with the transmission controller when running a scan of modules.
Now when running a scan of the transmission controller I read the following codes.
1 Component has short circuit or no connection.
2 The selector lever is in an intermediate position.
3 Can communication with the engine system is faulty.
4 Component has occasional short circuit or no connection.
Now I have had a dual trace oscilloscope connected to both the high and low can bus and the signals look clean with no noise on the channels. The voltages also match up with what I have read .
I have also measured the valve body solenoids resistance at the actual connector for the transmission control unit. This all appeared ok.
Should I now be chasing a can issue even through it appears ok when looking at it with a dual trace cro,
Any help and other suggestion would be appreciated.
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