2004 Jeep Cherokee INJECTOR

2004 JEEP CHEROKEE
65,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MANCHAS
  • MEMBER
  • 1 POST
Check engine light came on. Had check code
Code P0203 which is open or shorted injector #3.
Replaced injector. check engine light came back on with same code. Ohmmed out injector compared with injector #2 they had almost identical reading.

Swapped injector #2 with injector #3 worked fine for a day and again check engine light came on with the same code (P0203)

My question what can it be wrong? Is there something to check if injector getting power all the time? what powers the injector (where does the electrical signal comes from)?

thanks in advance
May 26, 2010 at 6:25 PM
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RASMATAZ
  • ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Use a noid lite on the injector harness and crank engine the lite should be flashing indicating it has power and the injector ground driver circuit is working
May 26, 2010 at 6:40 PM
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