Symptom:
INTERMITTENT CONDITION
POSSIBLE CAUSES
INTERMITTENT CONDITION
TEST ACTION APPLICABILITY
1 NOTE: The conditions that set the DTC are not present at this time. The
following list may help in identifying the intermittent condition.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE
PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
Refer to any Technical Service Bulletins (TSBs) that may apply.
Review the DRB Freeze Frame information. If possible, try to duplicate the
conditions under which the DTC set.
With the engine running at normal operating temperature, monitor the DRB
parameters related to the DTC while wiggling the wire harness. Look for parameter
values to change and/or a DTC to set.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched,
partially broken wires and broken, bent, pushed out, or corroded terminals.
CAUTION: NEVER PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Inspect and clean all PCM, engine, and chassis grounds.
If numerous trouble codes were set, use a wire schematic to help you find any
common ground or supply circuits.
For any Relay DTCs, actuate the Relay with the DRBIIIt and wiggle the related wire
harness to try to interrupt the actuation.
For intermittent Evaporative Emission trouble codes perform a visual and physical
inspection of the related parts including hoses and the Fuel cap.
A co-pilot, data recording, and/or lab scope should be used to help diagnose
intermittent conditions.
Use the DRBIIIt to perform a System Test if one applies to failing component.
Were any problems found during the above inspections?
All
Yes → Repair as necessary
No → Test Complete.
30
DRIVEABILITY - NGC
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