Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Electrical Power Management
The electrical power management (EPM) is used to monitor and control the charging system and alert the driver of possible problems within the charging system. The EPM system makes the most efficient use of the generator output, improves the battery state of charge (SOC), extends battery life.
The idle boost operation is a means of improving generator performance during a low voltage or low battery SOC condition.
Idle boost is activated in incremental steps, idle boost 1 must be active before idle boost 2 can be active. The criteria used by the body control module (BCM) to regulate EPM are outlined below:
| Function | Battery Temperature Calculation | Battery Voltage Calculation | Amp-hour Calculation | Action Taken |
|---|---|---|---|---|
| Idle Boost 1 Start | Less Than -15°C (5°F) | Less Than 13 V | - | First level Idle boost requested |
| Idle Boost 1 Start | - | - | Battery has a net loss greater than 0.6 AH | First level Idle boost requested |
| Idle Boost 1 Start | - | Less Than 11 V | - | First level Idle boost requested |
| Idle Boost 1 End | Greater Than -15°C (5°F) | Greater Than 12 V | Battery has a net loss less than 0.2 AH | First level Idle boost request cancelled |
| Idle Boost 2 Start | - | - | Battery has a net loss greater than 1.6 AH | Second level Idle boost requested |
| Idle Boost 2 Start | - | Less Than 11 V | - | Second level Idle boost requested |
| Idle Boost 2 End | - | Greater Than 12 V | Battery has a net loss less than 0.8 AH | Second level Idle boost request cancelled |
| Idle Boost 3 Start | - | - | Battery has a net loss of 10 AH | Third level Idle boost requested |
| Idle Boost 3 Start | - | Less Than 11 V | - | Third level Idle boost requested |
| Idle Boost 3 End | - | Greater Than 12 V | Battery has a net loss of less than 6 AH | Third level Idle boost request cancelled |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.