Terrain FWD L4-2.4L (2010)
Troubleshooting with a Digital Multimeter (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Circuit Testing/Troubleshooting with a Digital Multimeter) for information on connecting the EL-39200 to the circuit.
2. Set the rotary dial of the EL-39200 to the V (AC) or V (DC) position.
3. Press the range button of the EL-39200 in order to select the desired voltage range.
4. Press the MIN MAX button of the EL-39200. The EL-39200 displays 100 ms RECORD and emits an audible tone (beep).
Note: The 100 ms RECORD mode is the length of time an input must stay at a new value in order to record the full change.
5. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving, or
performing other operations. Refer to Inducing Intermittent Fault Conditions (See: Testing and Inspection/Component Tests and General
Diagnostics/General Electrical Diagnostic Procedures/Circuit Testing/Inducing Intermittent Fault Conditions).
6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded.
7. Press the MIN MAX button once in order to display the MAX value and note the value.
8. Press the MIN MAX button again in order to display the MIN value and note the value.
9. Determine the difference between the MIN and MAX values.
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If the variation between the recorded MIN and MAX voltage values is 1 V or greater an intermittent open or high resistance condition exists.
Repair the condition as necessary.
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If the variation between the recorded MIN and MAX voltage values is less than 1 V, an intermittent open or high resistance condition does not
exist.
Testing for Intermittent Conditions and Poor Connections
Testing for Intermittent Conditions and Poor Connections
Special Tools
EL-35616 Terminal Test Probe Kit
For equivalent regional tools, refer to Special Tools (See: Power and Ground Distribution/Tools and Equipment).
When the condition is not currently present, but is indicated in DTC history, the cause may be intermittent. An intermittent may also be the cause when
there is a customer complaint, but the symptom cannot be duplicated. Refer to the Symptom Table of the system that is suspect of causing the condition
before trying to locate an intermittent condition.
Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items:
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Wiring broken inside the insulation
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Poor connection between the male and female terminal at a connector
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Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire
insulation rather than the wire itself, and corrosion in the wire to terminal contact area, etc.
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Pierced or damaged insulation can allow moisture to enter the wiring causing corrosion. The conductor can corrode inside the insulation, with little
visible evidence. Look for swollen and stiff sections of wire in the suspect circuits.
*
Wiring which has been pinched, cut, or its insulation rubbed through may cause an intermittent open or short as the bare area touches other wiring
or parts of the vehicle.
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Wiring that comes in contact with hot or exhaust components
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Refer to Inducing Intermittent Fault Conditions (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical
Diagnostic Procedures/Circuit Testing/Inducing Intermittent Fault Conditions) in order to duplicate the conditions required, in order to verify the
customer concern.
*
Refer to Testing for Electrical Intermittents (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical
Diagnostic Procedures/Circuit Testing/Testing for Electrical Intermittents) for test procedures to detect intermittent open, high resistance, short to
ground, and short to voltage conditions.
*
Refer to Scan Tool Snapshot Procedure (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Circuit Testing/Scan Tool Snapshot Procedure) for advanced intermittent diagnosis and Vehicle Data Recorder operation.
Testing for Terminal Fretting
Some intermittent conditions can be caused by wire terminal fretting corrosion. Fretting corrosion is a build-up of insulating, oxidized wear debris that
can form when there is a small motion between electrical contacts. The oxidized wear debris can pile up enough at the electrical contact spots that the
electrical resistance across the connection increases. Movement between the contacting surfaces as small as 10 to 100 microns can cause fretting. To put
this in perspective, a sheet of paper is about 100 microns thick, so fretting motion is small and hard to see. Vibration and thermal expansion/contraction
are the main sources that create fretting motion. Since vehicles vibrate and can experience large temperature swings, they are a good source for fretting
motion. Tin, copper, nickel, and iron surfaces are all susceptible to fretting corrosion. Fretting corrosion can be difficult to see but it looks like small,
dark smudges on the terminals contact surface.
To correct a fretting condition disconnect the suspect connector and add Nyogel lubricant 760G (dielectric grease) to both sides of the connector
