LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Saturn >> 2006 >> Relay 3.9 1, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 3.9L - DTC P0442 To DTC P2A01 >> DTC P0660 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  1. Ignition OFF, disconnect the IMT valve harness connector at the IMT valve.
  2. Test for less than 1 ohm of resistance between the IMT valve ground circuit terminal B and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the IMT valve ignition 1 voltage circuit and ground.
    • If the test lamp does not illuminate, test the IMT valve ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the fuse for the IMT valve ignition 1 voltage circuit is open, test or replace the IMT valve.
  4. Connect a test lamp between the IMT valve control circuit terminal C and the IMT valve ignition 1 voltage circuit.
  5. Command the IMT valve ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the IMT valve control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the IMT valve control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. Ignition ON, test for 4-6 volts between the IMT valve signal circuit terminal D and ground.
    • If less than the specified range, test the IMT valve signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the IMT valve signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  7. Install a 3A fused jumper wire between the IMT valve signal circuit terminal D and ground. Verify the scan tool IMT valve Feedback parameter transitions from 0-100 percent.
    • If parameter does not change, test the IMT valve signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.
  8. If all circuits test normal, test or replace the IMT valve.
scientia non olet · About LEMON Manuals