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C4 - DS4 Owners :: Forums :: C4 Picasso and Grand Picasso - PRE 2013 only :: C4 Picasso Problems and issues
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Re: Esa/asr fault on project c4 picasso mk1 2013
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Author Post
vincentfishing   
Fri May 09 2025, 07:59am
Member No: #57297
Joined: Nov 26 2020
Location: Westgate kent uk
 still haven't resolved esa/asr fault , new wheel bearings wishbones, tracking done, egr cleaned and working ,dpf changed and reset, all actuator tests on everything passed, abs readings on all 4 wheels good, can clear the c1391 fault on individual test of abs/traction control, but when I restart global test it comes straight back on( with no driving of car) also noticed( and it may be normal) that when global test picks up the u1218 there's a loud thunk behind console and the same thunk when it picks up the c1391 like a relay is being activated /deactivated is this normal ?? , just a note, there is no limp mode and auto handbrake works fine, actuator tests on everything seem good no other faults other than aerial fault on radio . All the usual other faults for esa/asr would bring up other codes i believe, so think definately bad ecu /wiring ,,,when I got car I found scuttle drains were blocked so lots of water sloshing round in scuttle, now thinking I need to check out back of bsi and local wiring for damage ? when I checked abs ecu all power wires etc had continuity but havnt checked everything individually which will be last attempt after bsi check, Open to any thoughts / ideas that might help, thanks.
vincentfishing   
Thu May 15 2025, 04:58pm
Member No: #57297
Joined: Nov 26 2020
Location: Westgate kent uk
 Only have c1391 fault which still clears on diagbox but comes straight back on when global test is run ,this is without starting the car or moving it in any way, when I look at detail of fault it shows yaw angle speed 27 deg/s and transverse acceleration of 2.6m/s which I find strange as not moved car between clearing fault and it coming back ???? Anyone xhed any light on these 2 readings ,thanks
vincentfishing   
Fri May 16 2025, 10:45am
Member No: #57297
Joined: Nov 26 2020
Location: Westgate kent uk
 Today ,I decided to check live dynamic info
steering angle = good
Yaw speed angle 0deg =good
Longitudinal acceleration 0= good
Transverse acceleration 2.6m/s = ???
Expected a bit of error possibly but is this acceptable ?? Shaked the car left and right and reading went up and down accordingly ,so it appears to working, but to think it's moved 2.5meters in a second doesnt sound right, did a recalibration and didn't change....this was engine off static test
Any thoughts anybody ???
vincentfishing   
Sun May 18 2025, 12:52pm
Member No: #57297
Joined: Nov 26 2020
Location: Westgate kent uk
 Decided to oder yaw sensor 2nd hand off ebay and fit and calibrate to see what happens with readings, bit of a pain getting to it to remove.
Stefano27   
Thu Jun 26 2025, 02:18pm
Member No: #62270
Joined: Aug 03 2024
Location: Italia, Enna
 @vincentfishing Have you solved it by any chance?
vincentfishing   
Fri Jun 27 2025, 08:30pm
Member No: #57297
Joined: Nov 26 2020
Location: Westgate kent uk
 Sorry no !! ,have stripped loom all the way to esa ecu replaced wires that looked potentially damaged , still only have c1391 torque fault with no other fault , waiting to buy a donor car at right price and spec with no electrical faults (seen a couple with clutches gone, but too far away )to start swapping out battery fuse board ,bsm, yaw sensor etc etc to eliminate suspects ,but as there are no other faults believe it's still a hidden electric fault somewhere ,going to keep looking testing wiring in meantime ,will post answer if I find it !! Let me know if you find solution , , ,
 

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