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.
Scan Tool Data Definitions
- Battery Voltage Signal
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The scan tool displays 0-20 volts. The scan tool displays the voltage as received by the module.
- Crank Request Signal
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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
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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
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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
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The scan tool displays system voltage received by the module.
- PNP Switch
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The scan tool displays Park/Neutral or In Gear. The scan tool displays the position of the PNP switch.
- Starter Relay Circuit Status
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The scan tool displays Incomplete, Short Gnd/Open, Short to B+ or OK. The scan tool displays the status of the starter relay circuit.
- Starter Relay Command
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The scan tool displays Off/On. The scan tool displays Off until engine start has been requested, then it displays On.
- TR Sw
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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.
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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.