2010 Jeep Grand Cherokee Owner Manual SRT8 - Page 317

316 MAINTAINING YOUR VEHICLE Your vehicle has a simple ignition key-actuated test, which you can use prior to going to the test station. To check if your vehicle's OBD II system is ready, you must do the following: 1. Turn the ignition switch to the ON position, but do not crank or start the engine. the ignition or start the engine. This means that your vehicle's OBD II system is not ready and you should not proceed to the I/M station. b. The MIL will not flash at all and will remain fully illuminated until you turn OFF the ignition or start the engine. This means that your vehicle's OBD II system is ready and you can proceed to the I/M station. 2. If you crank or start the engine, you will have to start this test over. If your OBD II system is not ready, you should see your authorized dealer or repair facility. If your vehicle was 3. As soon as you turn the ignition switch to the ON recently serviced or had a battery failure or replacement, position, you will see the MIL symbol come on as part of you may need to do nothing more than drive your a normal bulb check. vehicle as you normally would in order for your OBD II 4. Approximately 15 seconds later, one of two things will system to update. A recheck with the above test routine may then indicate that the system is now ready. happen: a. The MIL will flash for about 10 seconds and then Regardless of whether your vehicle's OBD II system is return to being fully illuminated until you turn OFF ready or not, if the MIL is illuminated during normal vehicle operation you should have your vehicle serviced