check engine CITROEN C2 2003 User Guide
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Starting the engine with an assisting battery
If the battery is discharged, it is possible to use either a separate emergency battery or a battery on another vehicle.A. Dischargedbattery (Under the bonnet).B. Assisting battery.
 C h e c k   t h a t   t h e   a s s i s t i n g   b a t t e r y   h a s   s u f fi   c i e n t   v o l t a g e   ( 1 2   V ) .
If you use the battery on another vehicle, stop the engine  on the latter.  The  two  vehicles  must  not  come  into  direct  contact  wit h each other.
Connect  the  cables  according  to  the order  indicated  in  the orderdiagram. Check that the leads are well secured (risk of sparks).
Start  the  engine  of  the  assisting  vehicle.  Let  the  engine run  for around 1 minute at a slightly accelerated idle.
Operate the starter on the vehicle being assisted.
It is essential to follow the indicated sequence correctly .
 N e v e r   a p p r o a c h   w i t h   a   fl   a m e   o r   c r e a t e   s p a r k s   i n   t h e   v i c i n i t y  of the battery (explosive gas).
The  battery  contains  dilute  sulphuric  acid  which  is  highly corrosive.
When  handling  batteries,  always  protect  your  face  a nd especially your eyes.
In  the  event  of  any  contact  with  the  skin,  rinse  immediatel y with copious amounts of fresh water.
Advice
Do not touch the leads during the operation.
Do not lean over the batteries.
Disconnect  the  cables  in  reverse order,  making  sure  they  do  not touch together.
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