Specifications

Symptom:
P2521-IMPROPER START ATTEMPT
POSSIBLE CAUSES
VERIFY ACTIVE DTC
ENGINE CONTROL MODULE
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.
NOTE: This DTC indicates that engine rotation has occurred without an
ignition switch Start input. This can occurred when an attempt to start the
vehicle using a push start method.
NOTE: Consult with the customer to determine if a push start has been
attempted.
Turn the ignition on.
With the DRBIIIt, erase ECM DTCs.
Perform several engine run cycles, turning the ignition off for at least 20 seconds
between each engine run cycle.
With the DRBIIIt, read the ECM DTCs.
Did this DTC set again?
All
Yes → Replace and program the Engine Control Module in accordance
with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No → Test complete.
Perform ROAD TEST VERIFICATION - VER-2.
224
DRIVEABILITY - DIESEL