Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Cadillac >> 2007 >> SRX 3.6 7, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 3.6L (Ly7) - DTC P0420 To DTC P2010 >> DTC P0652 or P0653 >> Circuit/System Testing

Circuit/System Testing

    IMPORTANT: Additional DTCs will set when disconnecting the components.
  1. Ignition OFF, disconnect the harness connector of all appropriate sensors for the applicable DTC. Refer to Diagnostic Aids.
  2. Ignition ON, measure for 4.6-5.2 volts between one of the 5-volt reference circuits and ground.
    • If the voltage is less than 4.6 volts, test for a short to ground on all the 5-volt reference circuits. If all circuits test normal, replace the control module.
    • If the voltage is greater than 5.2 volts, test for a short to voltage on all the 5-volt reference circuits for each component associated with the appropriate 5-volt reference circuit. If all circuits test normal, replace the control module.
    3. IMPORTANT: A short to voltage on the signal circuit of certain components may cause this DTC to set.
  3. Connect each component associated with the 5-volt reference 2 circuit one at a time while monitoring the 5-Volt Reference 2 Circuit Status parameter with a scan tool. The parameter should continue to display OK.
    • If the parameter displays Fault when a component is connected, test the signal circuit of that component for a short to voltage. If the circuit tests normal, replace the component.
scientia non olet · About Mike's Workshop Manuals