Jeep Workshop Manuals
Grand Cherokee 2WD V6-3.7L (2008)
Relays and Modules > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Diagrams > Diagram Information and Instructions > Page 497
1. Connect the positive lead of the voltmeter to the side of the circuit closest to the battery.
Troubleshooting Wiring Problems
DIAGNOSIS AND TESTING - WIRING HARNESS
When diagnosing a problem in an electrical circuit there are several common tools necessary. These tools are listed and explained below.
Jumper Wire - This is a test wire used to connect two points of a circuit. It can be used to bypass an open in a circuit.
WARNING: Never use a jumper wire across a load, such as a motor, connected between a battery feed and ground.
Voltmeter - Used to check for voltage on a circuit. Always connect the black lead to a known good ground and the red lead to the positive side of
CAUTION: Most of the electrical components used in today's vehicles are Solid State. When checking voltages in these circuits, use a meter
Ohmmeter - Used to check the resistance between two points of a circuit. Low or no resistance in a circuit means good continuity.
CAUTION: Most of the electrical components used in today's vehicles are Solid State. When checking resistance in these circuits use a meter
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