I have a 2002 Sierra Truck. The battery is good.
Do you have crank no start?
Do you have no crank no dash lights nothing?
Items to check out Battery and battery cables (Load test battery and make sure cables are clean and tight especially the B+ cable off the starter).
Listen to the cranking speed of the starter. Does it sound normal or slow? Depending on what you hear you may want to do a starter current draw test or have a shop do it for you.
If all of the above are a-ok then move onto fuel and ignition checks. AT THIS POINT YOU SHOULD HAVE CRANK NO START.
When you put the key into the ignition and turn it to on position do you hear the fuel pump buzz?
No buzzing sound ... you could have either a bad fuel
pump or relay. Either way the vehicle is going to a shop for further diagnosis and repair.
Unscrew a spark plug attach it to its wire and ground its electrode . Crank engine and look for spark.
No spark! Now check plug wires and coil. How? Use shop manual for correct testing procedure .
If no spark is found coming from the coil then check B+ coming from battery to coil and ignition module.
Lastly not likely , ignition switch should not be left out of the equation. Your gonna need the shop manual for that test procedure. Good luck
Apr 19, 2010 |
2002 GMC Sierra