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.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Scan Tool Data Definitions
Scan Tool Data Definitions
Battery Voltage Signal
- The scan tool displays 0-20 volts. The scan tool displays the voltage as received by the module.
Crank Request Signal
- The scan tool displays Yes/No. The scan tool displays No until the ignition is placed into the START position, then Yes is displayed.
Generator L Terminal Signal Command
- The scan tool displays On/Off. The scan tool displays Off until the engine is running, at which time it will display On.
Generator F Terminal Signal
- The scan tool displays 0-100 percent. The scan tool displays 0-5 percent until the engine is running, then the percentage value varies depending on electrical loads.
Ignition 1 Signal
- The scan tool displays system voltage received by the module.
Starter Relay Circuit Status
- The scan tool displays Fault, Indeterminate and OK. The scan tool displays the status of the starter relay circuit.
Starter Relay Command
- The scan tool displays Off/On. The scan tool displays Off until engine start has been requested, then it displays On.
TR Sw
- The scan tool displays Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive and Drive 1. The scan tool displays the position of the transmission range switch.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no 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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.