Use the connector test adapter kit EL-35616-F for any test that requires probing the
following items:
The control module harness connectors
The electrical center fuse/relay cavities
The component terminals
The component harness connector
Using this kit will prevent damage caused by the improper probing of connector
terminals.
Several of the symptom procedures call for a careful visual and physical inspection. This can lead
to correcting a condition without further tests and can save time. This inspection should include
the following:
Ensure that the control module grounds are clean, tight, and correctly located.
Inspect cooling system hoses and pipes for splits, kinks, and improper connections. Inspect
thoroughly for any type of leak or restriction.
Inspect for a dirty or restricted radiator or HVAC condenser.
Inspect for aftermarket devices which could affect the operation of the cooling system.
Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.
Inspect the coolant recovery reservoir for proper coolant level.
Identifying Intermittent Conditions
Many intermittent conditions occur with harness or connector movement due to engine torque,
rough pavement, vibration or physical movement of a component. Refer to the following for a list
to help isolate an intermittent condition:
Water intrusion in connectors, terminals, or components
Poor connector mating
Terminal contact
High circuit or component resistance—High resistance can include any resistance, regardless
of the amount, which can interrupt the operation of the component.
Harness’ that are routed too tight, or chaffed circuits
High or low ambient temperatures
High or low engine coolant temperatures
High underhood temperatures
Heat build up in components or circuits due to circuit resistance, poor terminal contact, or
high electrical load
High or low system voltage
High vehicle load conditions
Rough road surface
Electro-magnetic interference (EMI)/circuit interference from relays, solenoids or other
electrical surge
Incorrect installation of non-factory, aftermarket, or after factory add on accessories
If an intermittent fault is detected, refer to Testing for Intermittent Conditions and Poor
Connections for specific strategies in diagnosing intermittent conditions.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:
Engine Overheating
Loss of Coolant
Thermostat Diagnosis