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HOMESERVICE MANUALSGMC1992JIMMY BASE, 2D UTILITY, 4.3 Z, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - A/TDIAGNOSTIC FLOW CHARTS (CARS)CHART D-1, GROUNDED SERIAL DATA CIRCUIT (NON-CRT EQUIPPED TORONADO & TROFEO)
1992 GMC Jimmy Base, 2D Utility, 4.3 Z, 4WD, Standard

Chart D-1, Grounded Serial Data Circuit (Non-CRT Equipped TORONADO & TROFEO)

1992 GMC Jimmy Base, 2D Utility, 4.3 Z, 4WD, StandardSECTION Chart D-1, Grounded Serial Data Circuit (Non-CRT Equipped TORONADO & TROFEO)
Fig 1: Chart D-1 - Wiring Schematic (Non-CRT Toronado & Trofeo)
G91F11895Courtesy of GENERAL MOTORS CORP.

With grounded serial data circuit, BCM will not be able to communicate with any other devices in system. Voltage measured anywhere along circuit will be zero. Display on IPC will be ELECTRICAL PROBLEM and ECCP will display dashes "---".

NOTE: Test number refers to test number no diagnostic chart.
  1. This step splits system in half to help isolate the source of grounded serial data line. If taking PCM out of system allows both halves of serial data line to rise above one volt, the source of short has been located. The remaining steps of chart follow same pattern in that the components are removed from serial data line until normal voltage range is again measured. When section of circuit is isolated, a simple check of wire for short to ground differentiates between a grounded wire or a ground in the device.
Fig 2: Chart D-1 - Troubleshooting Diagram (Non-CRT Toronado & Trofeo)
G91G11896Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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

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