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and in the correct location. 5. Inspect for aftermarket devices that could affect the operation of the System OK Go to Step 2 2 1. Install a scan tool. 2. Turn ON the scan tool. Does the scan tool turn ON? Go to Step 3 Go to Scan Tool Does Not Power Up in Data Link Communications 3 1. Turn ON the ignition, with the engine OFF. 2. Attempt to establish communication with the listed z Powertrain control module z Electronic brake control z Body control module (BCM) Does the scan tool communicate with all Go to Step 4 Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications 4 1. Access the Class 2 Power Mode in the Diagnostic Circuit Check on 2. Rotate the ignition switch through all positions while observing the Refer to the Body Control System IMPORTANT: The engine may start during the
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L - Hummer H2
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