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Circuit/System Testing

NOTE:

Before performing any Circuit/System Testing verify the Engine Sound Management System is in the Auto mode. To verify this, press Settings on the IPC home page. Select Driving Mode, then select Engine Sound Management and verify Auto is enabled. If the Engine Sound Management System is in the Off mode the exhaust flow control valves will remain in the open position.

  1. Ignition ON.
  2. Verify DTC U0109, P2534 or P2535 are not set.
    • If none of these DTCs are set 
  3. Ignition OFF, disconnect the harness connectors at the components listed below.
    • Q15L Exhaust Flow Control Valve - Left
    • Q15R Exhaust Flow Control Valve - Right
  4. Test for less than 5 Ω between each ground circuit terminal 1 and ground.
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  5. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the appropriate exhaust flow control valve.
    • If the test lamp illuminates 
  6. Connect a test lamp between each control circuit terminal 2 and ground, ignition ON.
  7. Verify the test lamp turns ON and OFF when commanding the exhaust flow control valves Open and Closed with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the X1 harness connector at the K38 Chassis Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K38 Chassis Control Module.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K38 Chassis Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K38 Chassis Control Module.
    • If the test lamp turns ON and OFF 
  8. Test or replace the appropriate exhaust flow control valve.
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