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Symptom List: P1615-ECM VOLTAGE SUPPLY IS TOO HIGH Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be P1615-ECM VOLTAGE SUPPLY When Monitored and Set Condition: P1615-ECM VOLTAGE SUPPLY IS TOO HIGH When Monitored: With the ignition on. Set Condition: The ECM detects voltage above 16 volts on the Battery Supply circuit(s). P1615-ECM VOLTAGE SUPPLY IS TOO LOW When Monitored: With the ignition on. Set Condition: The ECM detects voltage below 8.0 volts on the ECM Battery Supply circuit(s). POSSIBLE CAUSES CHECKING ECM POWER AND GROUNDS ECM INTERMITTENT CONDITION TEST ACTION APPLICABILITY 1 NOTE: If the ECM detects and stores a DTC, the ECM also stores the All Yes → Go To 2 No → Go To 3 100 DRIVEABILITY - DIESEL |