Chevrolet Workshop Manuals
Astro Van 2WD V6-4.3L VIN W (2001)
Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Accessory Delay Module > Component Information > Diagrams > Diagram Information and Instructions > Page 18
Testing for a Short to Voltage
If the fault is not identified, perform the procedure below using the MIN MAX feature on the J 39200 DMM. This feature allows you to manipulate the
IMPORTANT: The J 39200 must be used in order to perform the following procedure since the J 39200 can monitor current, resistance or voltage
1. Connect the J 39200 to both sides of a suspected connector (still connected), or from one end of a suspected circuit to the Other. Refer to
troubleshooting with a Digital Multimeter for information on connecting the J 39200 to the circuit. See: General Electrical Diagnostic
2. Set the rotary dial of the J 39200 to the V (AC) or V (DC) position.
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: General Electrical Diagnostic Procedures/Circuit
6. Listen for the audible Min Max Alert which indicates that a new minimum or maximum value has been recorded.
If the variation between the recorded MIN and MAX voltage values is 1 volt or greater an intermittent open or high resistance condition exists.
If the variation between the recorded MIN and MAX voltage values is less than 1 volt an intermittent open or high resistance condition does
Testing For Intermittent and Poor Connections
Most intermittent conditions are caused by faulty electrical connections or wiring. Inspect for the following items:
Wiring broken inside the insulation
Poor connection between the male and female terminal at a connector-Refer to Testing for Proper Terminal Contact for the specific procedure.
Poor terminal to wire connection-Some conditions which fall under this description are poor crimps, poor solder joints, crimping over the wire
Wire insulation which is rubbed through- This causes an intermittent short as the bare area touches Other wiring or parts of the vehicle.
Refer to Inducing Intermittent Fault Conditions in order to duplicate the conditions required in order to verify the complaint. See: General
Refer to Testing for Electrical Intermittents for test procedures to detect intermittent open, high resistance, short to ground, and short to voltage
Refer to Scan Tool Snapshot Procedure for advanced intermittent diagnosis. See: General Electrical Diagnostic Procedures/Circuit Testing/Scan
Testing For Proper Terminal Contact
J 42675 Flat Wire Probe Adapter kit
J 38125-B Terminal Repair kit
It is important to test terminal contact at the component and any in-line connectors before replacing a suspect component. Mating terminals must be
Contamination may be caused by the connector halves being improperly connected. A missing or damaged connector seal, damage to the connector
Deformation is caused by probing the mating side of a connector terminal without the proper adapter, improperly joining the connector halves, or
Deformation, usually to the female terminal contact tang, can result in poor terminal contact causing an open or intermittently open circuit.
Round Wire Connectors
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