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 Chevrolet Uplander V6-3.9LFACTORY 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 or the 72-08 battery voltage message from the body control module (BCM).
GEN F-Terminal Signal
- The scan tool displays 0-100%. The scan tool displays 0-10% until the engine is started and the powertrain control module engine control module (ECM) receives a signal from the generator then 5-90% is displayed.
GEN L-Terminal Signal Command
- The scan tool displays On/Off. The scan tool displays Off until the engine is running, then the engine control module (ECM) supplies then the percentage value varies depending on electrical loads.
GEN L-Terminal Signal Status
- The scan tool displays OK/Incomplete/Short Gnd/Open/Short B+. The scan displays the status of the Generator L terminal circuit.
Ignition 1 Signal
- The scan tool displays 0-20 Volts. The scan tool displays the voltage as received on the Ignition 1 circuit to the ECM.
Starter Relay Command
- The scan tool displays ON/OFF. The scan tool displays Off until engine start has been requested, then it reads On.
Starter Relay Circuit History
- The scan tool displays Fault/OK/Invalid State. The scan tool displays Fault until the starter relay circuit history is grounded then OK is displayed.
Starter Relay Circuit Status
- The scan tool displays OK/Incomplete/Short Gnd/Open/Short B+. The scan displays the status of the starter relay control circuit.
PNP Switch
- The scan tool displays, In Gear/Park/Neutral/. The scan tool displays the position of the transmission range switch.
Factory Service Tools
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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.
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