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.
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HOMESERVICE MANUALSCHEVROLET2002IMPALA LSREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALSTARTERSTARTING SYSTEMDIAGNOSTIC INFORMATIONDTC B1327TESTING
2002 Chevrolet Impala LS
DTC B1327: Testing
2002 Chevrolet Impala LSSECTION Testing
- Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .
- Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the ELECTRONIC BATTERY FD parameter in the BCM data list. Does the scan tool indicate the battery voltage is greater than the specified value of 9.0V? If so, go to step 8 . If not, go to next step.
- Measure the voltage across the battery terminals. Compare the battery voltage with the Electronic Battery FD parameter in the BCM data list. Are the voltages within the specified value of 1.0V? If so, go to step 8 . If not, go to next step.
- Turn OFF the ignition. Disconnect the harness connector of the module setting DTC B1327. Turn ON the ignition, with the engine OFF. Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and the ground circuit of the module setting the DTC B1327. Does the voltage measure greater than the specified value of 9.0V? If so, go to step 8 . If not, go to next step.
- Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and a good ground. Does the voltage measure greater than the specified value of 9.0V? If so, go to next step. If not, go to step 7 .
- Test the ground circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 10 . If not, go to step 8 .
- Test the battery positive voltage circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
- Inspect for poor connections at the harness connector of the module setting the code. Did you find and correct the condition? If so, go to next step.
- Replace the module setting the code. Did you complete the replacement? If so, go to next step.
- Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See CONDITIONS FOR RUNNING THE DTC . Does the DTC reset? If so, go to step 2 . If not, then system is okay.
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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.