Savana 3500 V8-4.8L VIN V (2005)
Diodes and solid state components in a circuit can cause a DMM to display a false reading. To find out if a component is affecting a measurement take
a reading once, then reverse the leads and take a second reading. If the readings differ the solid state component is affecting the measurement.
Following are examples of the various methods of connecting the DMM to the circuit to be tested:
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Backprobe both ends of the connector and either hold the leads in place while manipulating the connector or tape the leads to the harness for
continuous monitoring while you perform other operations or test driving. Refer to Probing Electrical Connectors.
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Disconnect the harness at both ends of the suspected circuit where it connects either to a component or to other harnesses.
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If the system that is being diagnosed has a specified Pinout or breakout box, it may be used in order to simplify connecting the DMM to the circuit
or for testing multiple circuits quickly.
Troubleshooting With A Test Lamp
TROUBLESHOOTING WITH A TEST LAMP
TOOLS REQUIRED
J 35616-200 12-Volt Unpowered Test Lamp
NOTE:Refer to Test Probe Notice in Service Precautions.
A test lamp can simply and quickly test a low impedance circuit for voltage.
The J 35616-200 is Micro-Pack compatible and comprised of a 12-volt light bulb with an attached pair of leads.
To properly operate this tool use the following procedures.
When testing for voltage:
1. Attach 1 lead to ground.
2. Touch the other lead to various points along the circuit where voltage should be present.
3. When the bulb illuminates, there is voltage at the point being tested.
When testing for ground:
1. Attach 1 lead to battery positive voltage.
2. Touch the other lead to various points along the circuit where ground should be present.
3. When the bulb illuminates, there is ground at the point being tested.
Using Connector Test Adapters
USING CONNECTOR TEST ADAPTERS
NOTE:Do not insert test equipment probes (DVOM etc.) into any connector or fuse block terminal. The diameter of the test probes will deform most
terminals. A deformed terminal will cause a poor connection, which will result in a system failure. Always use the J-35616 GM-Approved Terminal Test
Kit or the J 42675 Flat-Wire Probe Adapter in order to front probe terminals. Do not use paper clips or other substitutes to probe terminals.
When using the J-35616 GM-Approved Terminal Test Kit, ensure the terminal test adapter choice is the correct size for the connector terminal. Do not
visually choose the terminal test adapter because some connector terminal cavities may appear larger than the actual terminal in the cavity. Using a
larger terminal test adapter will damage the terminal. Refer to the J-35616 GM-Approved Terminal Test Kit label on the inside of the J-35616
GM-Approved Terminal Test Kit for the correct adapter along with the connector end view for terminal size.
Using Fused Jumper Wires
USING FUSED JUMPER WIRES
TOOLS REQUIRED
J 36169-A Fused Jumper Wire
IMPORTANT: A fused jumper may not protect solid state components from being damaged.
The J 36169-A includes small clamp connectors that provide adaptation to most connectors without damage. This fused jumper wire is supplied with a
20-A fuse which may not be suitable for some circuits. Do not use a fuse with a higher rating than the fuse that protects the circuit being tested.
Connector Position Assurance Locks
CONNECTOR POSITION ASSURANCE LOCKS
The connector position assurance (CPA) is a small plastic insert that fits through the locking tabs of the connector. CPAs are used in various connectors
