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ECM Power Circuit

  1. With ignition off, unplug ECM connectors. With ignition on, check for battery voltage between ECM connector terminal A6 (Red/White/Black wire) and ground.
  2. If battery voltage does not exist, check fuse No. 10 (20-Amp) in fuse panel. See Fig 1 . If fuse is okay, check for an open in Red/White/Black wire between fuse panel and ECM connector terminal A6. If wire is okay, check for defective ignition switch.
  3. Check for battery voltage at ECM terminals B1 and C16. If battery voltage does not exist, repair Red/Yellow wire from battery.
Fig 1: Locating Engine Performance Components
G91J16328Courtesy of GENERAL MOTORS CORP.
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