Power loss when indicating and overtaking

[Jona]

Just bought my daughter a 2005 micra sport plus. She says that when overtaking on the motorway it kangaroos but seems ok when she switches the indicator off. Strange. I will try and test it myself but has anyone come across this. Thanks.

 

[Jona]

Just bought my daughter a 2005 micra sport plus. She says that when overtaking on the motorway it kangaroos but seems ok when she switches the indicator off. Strange. I will try and test it myself but has anyone come across this. Thanks.

Update. Found a post from 2009 with exactly the same symptoms and checked the rear light for water/damp but no issues. So none the wiser, but do get rapid flashing on the right cluster indicator on a random basis. Any ideas?

 

[frank]

earth problem maybe jona ? https://www.micra.org.uk/threads/very-slow-acceleration-k12.59307/#post-658524

 

[plmval]

K12 Loss of Power/Rev Limiting/Holding Back

This is a complex electrical and electronic engine management control problem and as you just bought the vehicle the supplying dealer has a responsibility to repair or replace it under UK retail consumer protection law sale of goods act and fit for purpose law.

1. Check the charging voltage throughout the rev range. Should be 14 volts approx, with load headlamps /rear screen heater on and/or off. Note that many vehicles built after 2004 have the regulator built into the ECU module and not the alternator.
2. If out of normal voltage range than disconnect alternator and test drive a short distance to see if any improvement in rev range is obtained. If no improvement, reconnect alternator and move to test 3.
3. Isolate unplug the front and tail lamp clusters one at a time and test drive, turn the main lights on and off looking for any improvement change due to each lamp cluster being disconnect isolated.
4. If no improvement found, then isolate each front and rear lamp cluster via the fuses and repeat test procedure item 3. above.

With reference to and read the whole threads to the end;

With reference to; http://www.micra.org.uk/threads/very-slow-acceleration-k12.59307/

http://www.justanswer.com/uk-nissan/6o13w-nissan-micra-k12-lights-causing-power-los

ECU limits engine power automatically if it has input indication that any brakes are on. This may be due to an electrical fault such as wet/condensation in wiring and electrical can-bus assemblies anywhere, as well as ABS brakes and electronic stability control circuits. Common sources are loose /corroded/waterlogged rear tail lamp cluster PCB can bus assemblies, fog lamps, number plate lamps, & indicators. Also firewall bulkhead rainwater leaks, possibly from incorrectly installed pollen filters, leaking down onto ECU modules located under the dashboard area.
Reference:
http://www.honestjohn.co.uk/forum/post/index.htm?t=64231

Cars stuck in limp mode-check reverse & brake lights are working-check cruise control as it is linked to brake light/reverse switches and fuses.
Reference: http://www.efispares.com.au/tradetips.aspx

All of the above test sequence, to reveal possible sources of on load engine control ECU errors, can be carried out by a competent DIY person with minimal equipment and at little or no cost, just time, perseverance & motivation to save money.

You appear to have tried all the obvious related items to engine control and rev limiting, however the ECU is connected to many circuits, both directly and indirectly via can-bus data coms, and a fault in any one or combination of them anywhere on the vehicle can interfere with normal ECU operation and thus engine control performance.
Let us know how this control ECU enigma pans out?
Reference; https://www.micra.org.uk/threads/k1...ev-over-3000-while-driving.59848/#post-673144



Last edited: Apr 8, 2014 plmval, Apr 7, 2014

 

[Jona]

Many thanks for your very helpful replies. Due to lack of time I had car checked at short notice yesterday by my local (good garage) who diagnosed high resistance in the auxiliary earth/ground wire and replaced it which has cured the problem.