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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1148 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0974) >> DTC P0716 or P0717 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the ignition ON, observe the transmission ISS/OSS supply voltage circuit status on the scan tool, the parameter should display OK. The ISS supply voltage should be 8.3-9.3 volts.
    • If the circuit status does not display OK, disconnect the ISS/OSS connector from the control solenoid (w/body and TCM) valve assembly and recheck the scan tool display.
    • If the transmission ISS/OSS supply voltage circuit status still displays OK, visually inspect the ISS, harness, connector, the control solenoid (w/body and TCM) valve assembly pins for metallic debris and 1-2-3-4 and 3-5-R clutch housing machined teeth surface for damage or misalignment. Repair or replace any damaged components.
  2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test . The scan tool should display Transmission ISS between 100-400 RPM.
    • If 100-400 ISS RPM is displayed, replace the ISS/OSS assembly.
    • If no ISS RPM is displayed or the RPM is out of range, replace the control solenoid (w/body and TCM) valve assembly.
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