6.5LT No Start, No Glow Plugs
#1
6.5LT No Start, No Glow Plugs
I have looked @ hte no start list in the forum, but i will ask my question. I have a 1997 Chevy 3500 6.5L Turbo. I am currently not getting the glow plug curcuit to work.
Here is what i know so far. There is power to the relay. ON the 3 wire plug, i ahve 12V @ the red wire when the key is turned, i have ground @ the black wire, but i am not getting 12V from the ECU to turn the circuit on. The yellow wire is fine from the relay to the ECU. Therw is 12V to the ECU, and ground. I can't not connect to the ECU through the scan tool.
Some Backround. The truck ran great will last week. i was replacing the solonoid for the plow and cleaning up a ground on the passengers side fender. Once back together, the fuel and temp guage went crazy. turned the truck off, and checked the ground. The guages now work fine, and if the ground is removed they still work. think the ground is for the front headlight area. Also my heater doesn't work. Sometimes it works on high, but not all the time.
I have a feeling the ECU is bad, but am not sure how to properly test it, as i don't want to throw parts @ it.
Thank you for any help.
Here is what i know so far. There is power to the relay. ON the 3 wire plug, i ahve 12V @ the red wire when the key is turned, i have ground @ the black wire, but i am not getting 12V from the ECU to turn the circuit on. The yellow wire is fine from the relay to the ECU. Therw is 12V to the ECU, and ground. I can't not connect to the ECU through the scan tool.
Some Backround. The truck ran great will last week. i was replacing the solonoid for the plow and cleaning up a ground on the passengers side fender. Once back together, the fuel and temp guage went crazy. turned the truck off, and checked the ground. The guages now work fine, and if the ground is removed they still work. think the ground is for the front headlight area. Also my heater doesn't work. Sometimes it works on high, but not all the time.
I have a feeling the ECU is bad, but am not sure how to properly test it, as i don't want to throw parts @ it.
Thank you for any help.
#8
I can't not connect to the ECU through the scan tool.
Read more: https://www.dieselbombers.com/chevy-...#ixzz15Pj5uSXT
Read more: https://www.dieselbombers.com/chevy-...#ixzz15Pj5uSXT
#9
see the pics for diagnosing
Circuit Description
The glow plug system is used to assist in providing the heat required to begin combustion during engine starting at cold ambient temperatures. The glow plugs are heated before and during cranking, as well as during the engine operation. The PCM controls the glow plug ON times by monitoring coolant temperatures and glow plug voltage. This system check will check the glow plugs and the glow plug feed circuit coming from the relay.
Diagnostic Aids
If the glow plug relay is stuck in the ON position, check for proper operation of glow plugs. When glow plugs are commanded ON by the scan tool, an internal PCM timer protects the glow plugs from
damage by cycling them ON for 3 seconds and then OFF for 12 seconds. Most glow plug system failures are covered by DTC P0380. If no DTCs are stored, vehicle is hard to start and white smoke is present during cranking or after the vehicle is started. The most likely cause of failure is the glow plugs.
Test Description
Number(s) below refer to the number(s) on the diagnostic table.
1.This step will make sure OBD system check is performed.
2.This step will make sure there are no other DTCs stored that will affect the operation of the glow plug system.
3.This step will check each glow plug for an open.
4.This step will check each glow plug feed circuit for an open.
Circuit Description
The glow plug system is used to assist in providing the heat required to begin combustion during engine starting at cold ambient temperatures. The glow plugs are heated before and during cranking, as well as during the engine operation. The PCM controls the glow plug ON times by monitoring coolant temperatures and glow plug voltage. This system check will check the glow plugs and the glow plug feed circuit coming from the relay.
Diagnostic Aids
If the glow plug relay is stuck in the ON position, check for proper operation of glow plugs. When glow plugs are commanded ON by the scan tool, an internal PCM timer protects the glow plugs from
damage by cycling them ON for 3 seconds and then OFF for 12 seconds. Most glow plug system failures are covered by DTC P0380. If no DTCs are stored, vehicle is hard to start and white smoke is present during cranking or after the vehicle is started. The most likely cause of failure is the glow plugs.
Test Description
Number(s) below refer to the number(s) on the diagnostic table.
1.This step will make sure OBD system check is performed.
2.This step will make sure there are no other DTCs stored that will affect the operation of the glow plug system.
3.This step will check each glow plug for an open.
4.This step will check each glow plug feed circuit for an open.