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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 52 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0716: Input Speed Sensor Circuit Performance >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Buick Regal, 2002 Buick Century, 2001 Buick Regal, and 2001 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install a Scan Tool. Turn ignition on, engine off. Before clearing the DTCs, use the scan tool to record the freeze frame and failure records for reference. Using the CLEAR INFO function will erase the stored freeze frame and failure records from the PCM. Record the freeze frame and failure records. Clear the DTCs. Start and idle the engine in Park. With the scan tool, observe the ISS parameter. Does the scan tool display a input shaft speed greater than 100 RPM? If so, ensure engine wiring harness is not located near spark plug wires or DIS coils. See DIAGNOSTIC AIDS  . If not, go to next step.
  3. Turn ignition off. Disconnect the transaxle in-line 20-way connector (additional DTCs may set). Connect the Jumper Harness (J 44152) to the transaxle side of the 20-way connector. Using the Connector Test Adapter Kit (J 35616-A), connect the DVOM from terminal "S" to terminal "V" of the jumper harness. Measure the resistance. Is the resistance within 820-1428 ohms? If so, go to next step. If not, go to step  8 .
  4. Leave one lead of the DVOM connected to terminal "S" of the jumper harness. Using the other lead, test for a short between terminal "S" and all other terminals in the transaxle in-line 20-way connector. Test for a short between terminal "S" and the transaxle case. Did you find the condition? If so, go to step  10 . If not, go to next step.
  5. Test the high signal circuit (CKT 1230) of the ISS for an open, a short to ground, or a short to the low signal circuit (CKT 1231) between the PCM connector and the transaxle in-line 20-way connector. Did you find and correct the condition? If so, go to step  13 . If not, go to next step.
  6. Turn ignition on, engine off. Test the high signal circuit (CKT 1230) of the ISS for a short to power between the PCM connector and the transaxle in-line 20-way connector. Did you find and correct the condition? If so, go to step  13 . If not, go to next step.
  7. Test the low signal circuit (CKT 1231) of the ISS for an open between the PCM connector and the transaxle 20-way connector. Did you find and correct the condition? If so, go to step  13 . If not, go to step  12 .
  8. Test the high signal circuit (CKT 1230) of the ISS for an open or a short to the low signal circuit (CKT 1231) of the ISS between the transaxle in-line 20-way connector and the sensor. Did you find the condition? If so, go to step  10 . If not, go to next step.
  9. Test the low signal circuit (CKT 1231) of the ISS for an open between the transaxle in-line 20-way connector and the sensor. Did you find the condition? If so, go to next step. If not, go to step  11 .
  10. Replace the transaxle internal wiring harness assembly. See TRANSAXLE INTERNAL WIRING HARNESS  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  13 .
  11. Replace the input shaft speed sensor. See INPUT SHAFT SPEED SENSOR  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  13 .
  12. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  13. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Start and idle the engine in Park.
    • The ISS must be greater than 500 RPM for one second.
    • Select SPECIFIC DTC.
    • Enter DTC P0716.

    Has the test run and passed? If so, system is okay. If not, go to step  1 .

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