Express 1500 RWD V8-5.3L (2008)
2. Disconnect the load.
3. Connect one lead of the test lamp to one end of the circuit to be tested.
4. Connect the other lead of the test lamp to battery positive voltage.
5. Connect the other end of the circuit to ground.
6. If the test lamp illuminates (full intensity), then the circuit has good continuity.
Testing for Electrical Intermittents
Testing for Electrical Intermittents
Tools Required
J39200 Digital Multimeter
Perform the following procedures while wiggling the harness from side to side. Continue this at convenient points (about 6 inches apart) while watching
the test equipment.
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Testing for Short to Ground
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Testing for Continuity
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Testing for a Short to Voltage
If the fault is not identified, perform the procedure below using the MIN MAX feature on the J39200 DMM. This feature allows you to manipulate the
circuit without having to watch the J39200. The J39200 will generate an audible tone when a change is detected.
Important: The J39200 must be used in order to perform the following procedure since the J39200 can monitor current, resistance or voltage
while recording the minimum (MIN), and maximum (MAX) values measured.
1. Connect the J39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the other.
2. Set the rotary dial of the J39200 to the V (AC) or V (DC) position.
3. Press the range button of the J39200 in order to select the desired voltage range.
4. Press the MIN MAX button of the J39200. The J39200 displays 100 ms RECORD and emits an audible tone (beep).
Important: 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
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 volt 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 volt an intermittent open or high resistance condition does
not exist.
Testing for Intermittent Conditions and Poor Connections
Testing for Intermittent Conditions and Poor Connections
Tools Required
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J35616 GM-Approved Terminal Test Kit
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J-38125 Terminal Repair Kit
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
