10a. Check VPWR During Cranking: Purpose:

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The purpose of this test is to verify PCM power during cranking.

Scan Tool - Data List Monitoring

The scan tool may reset below 9.5 volts.
Select the parameters indicated from the scan tool parameter list and monitor while cranking the engine.

NOTE: The 8 volt specification represents the minimum battery voltage required for engine starting. Greater than average crank times are encountered if the battery voltage is less than 9.5 volts. If excessive crank time is a concern, verify battery voltage is greater than 9.5 volts.

NOTE: You may need to use an outside power source for the scan tool.

Parameter	Specification	Measurement
B+^A	8 volts minimum

^A If a low voltage condition is present, check the battery, charging system or power and ground circuits to the PCM.