41
If the scan tool does not power up, refer to
Scan Tool Does Not Power Up
.
Ignition ON, Engine OFF, verify communication with all of the control modules on the
vehicle.
If the scan tool does not communicate with one or more of the expected control
modules, refer to
Scan Tool Does Not Communicate with CAN Device
.
Verify that SPN 65559 is not set.
If SPN 65559 is set, refer to
SPN 65559
.
Attempt to start the engine. Verify that the engine cranks.
If the engine does not crank, refer to
SPN 66001
or
SPN 66002
(if equipped). If the
vehicle is not equipped with an ECM controlled starter relay, repair the starting system.
Attempt to start the engine. Verify the engine starts and idles.
If the engine does not start and idle, refer to
Engine Cranks But Does Not Run
.
Important:
Do not clear any SPNs unless instructed to do so by a diagnostic procedure.
Use the appropriate scan tool selections to obtain SPNs from each of the vehicle
modules. Verify there are no SPNs reported from any module.
If any SPNs are present, refer to
Diagnostic Trouble Code (DTC) List
and diagnose any
current SPNs in the following order:
Any of the following: 630, 65580, 65581, or 65582.
SPN 627.
Component level SPNs
.
System level SPNs.
Any remaining SPNs.
If none of the previous tests or inspections addresses the concern, refer to
Symptoms - Engine Controls
.
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