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 HHR L4-2.2LFACTORY 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 on the battery positive voltage circuit of the body control module (BCM).
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.
GEN F-Terminal Signal
- The scan tool displays 0-100%. The scan tool displays the percentage of the field current on the GEN F-Terminal circuit.
GEN L-Terminal Circuit Status
- The scan tool displays Incomplete, Short Gnd / Open, Short to B+ or OK. The scan tool displays the status of the GEN L-terminal circuit.
GEN L-Terminal Command
- The scan tool displays 0-100%. The scan tool displays the percentage of the GEN L-terminal signal.
Idle Boost Level
- The scan tool displays amps. The scan tool displays the current engine idle boost level as commanded by the ECM.
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.
Ignition Accessory Signal
- The scan tool displays On and Off. The scan tool displays if the ignition 0 signal is On or Off.
Run/Crank Relay
- The scan tool displays On or Off. The scan tool display actual state of the Run/Crank relay.
Run/Crank Relay Command
- The scan tool displays On or Off. The scan tool displays the commanded state of the Run/Crank relay.
Starter Relay Command
- The scan tool displays ON/OFF. The scan tool displays Off until engine start has been requested, then it reads On.
TR Sw.
- The scan tool displays Park, Reverse, Neutral, Drive 5, Drive 4, Drive 3, Drive 2, Drive 1. 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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