Specifications

Symptom List:
P1615-ECM VOLTAGE SUPPLY IS TOO HIGH
P1615-ECM VOLTAGE SUPPLY IS TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P1615-ECM VOLTAGE SUPPLY
IS TOO HIGH.
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
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, erase ECM DTCs.
NOTE: This DTC may be caused by a charging system problem. Refer to the
Service Information and verify proper charging system operation before
continuing.
Test drive the vehicle.
Turn the ignition on.
With the DRB, read ECM DTCs.
Did this DTC set again?
All
Yes → Go To 2
No → Go To 3
100
DRIVEABILITY - DIESEL