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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN C1500, 5.3 ZREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 193 (GENERATORS & REGULATORS)SYSTEM TESTSPCM & GENERATOR SHEARING INSPECTION
2006 Chevrolet Suburban C1500, 5.3 Z

Pcm & Generator Shearing Inspection

2006 Chevrolet Suburban C1500, 5.3 ZSECTION Pcm & Generator Shearing Inspection
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: If the generator field coil duty value does not change when electrical loads (headlights, blower motor, rear window defroster , brake lights etc.) are on or off, inspection with discharged battery is needed.
  1. Measure the generator terminal "B" voltage when the electrical loads (Headlights, blower motor, rear window defroster, and brake lights) on and then off. If more than 15 volts exists, go to next step. If less than 13 volts exists, go to step  3.
  2. Monitor the ALTTV (generator output voltage) PID using Worldwide Diagnostic System (WDS) or equivalent scan tool, or measure the voltage at PCM terminal 2AM using a DVOM. See Fig 1. If the voltage is 13-15 volts, go to step  4. If voltage is not 13-15 volts, check PCM input error.
  3. Monitor the ALTTV (generator output voltage) PID using Worldwide Diagnostic System (WDS) or equivalent scan tool, or measure the voltage of PCM terminal 2AM using a DVOM. See Fig 1. If voltage is 13-15 volts, go to step  5. If voltage is not 13-15 volts, check PCM input error.
  4. Using scan tool, monitor the ALTF (generator field coil control duty value) PID, or calculate the duty value of the PCM terminal 2AQ using a oscilloscope. See Fig 2. If the duty value is 100 percent, check for PCM input error. If duty value is not 100 percent, PCM and/or generator may be faulty.
  5. Using scan tool, monitor the ALTF (generator field coil control duty value) PID, or calculate the duty value of the PCM terminal 2AQ using a oscilloscope. See Fig 2. If the duty value is zero percent, check PCM input error. If the duty value in not zero percent, PCM and/or generator may be faulty.
Fig 1: Identifying Powertrain Control Module Harness Connector Terminals
G00307897Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.