Here's a breakdown of how to troubleshoot and repair the P0113 code on your 1996 Jimmy:
1. Inspection and Testing:
* Locate the IAT Sensor: This sensor is usually located in the intake air duct, somewhere between the air filter housing and the throttle body. Consult your vehicle's repair manual (Haynes or Chilton manuals are good resources) for the exact location on your specific model. It's typically a small, two-wire sensor.
* Visual Inspection: Carefully examine the sensor for any obvious physical damage such as cracks, broken wires, or corrosion. Look at the connector for any signs of damage or loose connections.
* Check Wiring: Inspect the wiring harness leading to the IAT sensor for any breaks, chafing, or shorts. Pay close attention to the area where the wires enter the engine compartment.
* Ohm Test (Advanced): If you have a multimeter, you can test the sensor's resistance. The resistance value should vary with temperature. Your repair manual will provide the specifications for your IAT sensor at various temperatures. A failed ohm test often confirms a bad sensor.
* Check for Vacuum Leaks: A significant vacuum leak can cause the intake air to heat up before it reaches the IAT sensor, potentially throwing this code. Listen for unusual hissing sounds around the intake manifold and vacuum lines.
2. Repair:
* Replace the IAT Sensor: If you find any damage to the sensor, wiring, or connector, or if your ohm test reveals it's faulty, replace the IAT sensor. This is often the most common cause of this code. Make sure to purchase a sensor that's specifically designed for your 1996 GMC Jimmy.
* Repair Wiring: If wiring damage is found, repair or replace the affected wires. Ensure proper insulation and secure connections.
* Fix Vacuum Leaks: If you detect vacuum leaks, repair them by replacing faulty hoses, gaskets, or seals.
3. After Repair:
* Clear the Code: After making repairs, use an OBD-II scanner to clear the diagnostic trouble code (DTC) from the PCM's memory.
* Test Drive: Drive the vehicle for a while to ensure the code doesn't reappear. If it does, re-check your work and consider seeking professional help.
Important Considerations:
* Repair Manual: Having a repair manual for your specific year and model of GMC Jimmy is highly recommended. It will provide detailed diagrams, specifications, and troubleshooting steps.
* Safety: Disconnect the negative battery terminal before working on any electrical components to prevent accidental short circuits.
* Professional Help: If you're not comfortable working on your vehicle's electrical system, it's best to take it to a qualified mechanic.
By following these steps, you should be able to diagnose and repair the P0113 code on your 1996 GMC Jimmy. Remember to always prioritize safety and consult a repair manual for specific details related to your vehicle.
