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redvett

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About redvett

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  1. Starting in 2005 GM installed a fuel saving charging regulator, it shuts off the charging when the battery voltage get to 12.80V and starts back up at around 11V so its working normal. Charging System Operation The purpose of the charging system is to maintain the battery charge and vehicle loads. There are 6 modes of operation and they include: Battery Sulfation Mode Charge Mode Fuel Economy Mode Headlamp Mode Start Up Mode Voltage Reduction Mode The engine control module (ECM) controls the generator through the generator turn ON signal circuit. The ECM monitors the generator performance though the generator field duty cycle signal circuit. The signal is a pulse width modulation (PWM) signal of 128 Hz with a duty cycle of 0-100 percent. Normal duty cycle is between 5-95 percent. Between 0-5 percent and 95-100 percent are for diagnostic purposes. The following table shows the commanded duty cycle and output voltage of the generator: Commanded Duty Cycle Generator Output Voltage 10% 11 V 20% 11.56 V 30% 12.12 V 40% 12.68 V 50% 13.25 V 60% 13.81 V 70% 14.37 V 80% 14.94 V 90% 15.5 V The generator provides a feedback signal of the generator voltage output through the generator field duty cycle signal circuit to the ECM. This information is sent to the body control module (BCM). The signal is PWM signal of 128 Hz with a duty cycle of 0-100percent. Normal duty cycle is between 5-99 percent. Between 0-5 percent and 100 percent are for diagnostic purposes. Battery Sulfation Mode The BCM will enter this mode when the interpreted generator output voltage is less than 13.2 V for 45 minutes. When this condition exists the BCM will enter Charge Mode for 2-3 minutes. The BCM will then determine which mode to enter depending on voltage requirements. Charge Mode The BCM will enter Charge Mode when ever one of the following conditions are met. The wipers are ON for more than 3 seconds. GMLAN (Climate Control Voltage Boost Mode Request) is true, as sensed by the HVAC control head. High speed cooling fan, rear defogger and HVAC high speed blower operation can cause the BCM to enter the Charge Mode.The estimated battery temperature is less than 0°C (32°F). Battery State of Charge is less than 80 percent. Vehicle speed is greater than 145 km/h (90 mph) Current sensor fault exists. System voltage was determined to be below 12.56 V When any one of these conditions is met, the system will set targeted generator output voltage to a charging voltage between 13.9-15.5 V, depending on the battery state of charge and estimated battery temperature. Fuel Economy Mode The BCM will enter Fuel Economy Mode when the estimated battery temperature is at least 0°C (32°F) but less than or equal to 80°C (176°F), the calculated battery current is less than 15 amperes and greater than -8 amperes and the battery state-of-charge is greater than or equal to 80 percent. Its targeted generator output voltage is the open circuit voltage of the battery and can be between 12.5-13.1 V. The BCM will exit this mode and enter Charge Mode when any of the conditions described above are present. Headlamp Mode The BCM will enter Headlamp Mode when ever the headlamps are ON (high or low beams). Voltage will be regulated between 13.9-14.5 V. Start Up Mode When the engine is started the BCM sets a targeted generator output voltage of 14.5 V for 30 seconds. Voltage Reduction Mode The BCM will enter Voltage Reduction Mode when the calculated ambient air temperature is above 0°C (32°F). The calculated battery current is less than 1 ampere and greater than -7 amperes and the generator field duty cycle is less than 99 percent. Its targeted generator output voltage is 12.9 V. The BCM will exit this mode once the criteria are met for Charge Mode
  2. 2004 had returnless fuel system and the regulator is on the meter in the tank. Check if your truck has #1 Flex Fuel and #2 two fuel lines, if it only has one it's a returnless system. My 2004 5.3L is.
  3. Get the correct color wire and solder and heat shrink all the wires affected.
  4. When you park your vehicle out side keep hood open and that will help keep rodents from their dinner.
  5. The 2007 wiring harness is most likely the problem. Change the harness as GM changes wiring harnesses most every model year.
  6. Here is some interesting reading. http://www.billswebspace.com/AirFilterTest.htm
  7. Just replace the bad terminal because the fuse block will not have any terminals.
  8. You shouldn't block off the line due to the steam venting it does just join both sides with HD rubber hose to bypass.
  9. If you dont have a SES light your good to go because the test stations dont care about history codes but you can check the accessory fuse, most likely the fuse is blown.
  10. BTW I f the KS are looking bad get the pigtail and lookup on youtube the GM recommended fix with silicone.
  11. Intake leaks will set 0171 code. Doing the knock sensors while your in there will save you time and money.
  12. Looks like you have a vacuum leak at the plenum to cyl. head. https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn
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