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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P163A: Control Module Fuel Pressure Regulator 1 Control System Circuitry Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle Off, disconnect the harness connector at the G18 High Pressure Fuel Pump.
  2. Ignition On/Vehicle in Service Mode, verify that a test lamp does not illuminate between ground and the terminals listed below:
    • High control circuit terminal 1
    • Low control circuit terminal 2
    • If the test lamp illuminates 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
    2. Test for less than 1 V between the appropriate control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K20 Engine Control Module.
      • If the test lamp does not illuminate 
  3. Verify that a test lamp does not illuminate between B+ and the terminals listed below:
    • High control circuit terminal 1
    • Low control circuit terminal 2
    • If the test lamp illuminates 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the appropriate 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 K20 Engine Control Module.
    • If the test lamp does not illuminate 
  4. Connect a 3 A fused jumper wire between the high control circuit terminal 1 and ground.
  5. Verify the scan tool Fuel Pressure Regulator High Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator High Control Circuit Low Voltage Test Status transitions from OK to Malfunction.
    • The parameters do not change 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the high 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 K20 Engine Control Module.
    • The parameters change 
  6. Connect a 3 A fused jumper wire between the low control circuit terminal 2 and B+.
  7. Verify the scan tool Fuel Pressure Regulator Control Circuit Open Test Status transitions from Malfunction to OK and the Fuel Pressure Regulator Control Circuit High Voltage Test Status transitions from OK to Malfunction.
    • The parameters do not change 
    1. Ignition/Vehicle Off, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low 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 K20 Engine Control Module.
    • The parameters change 
  8. Test or replace the G18 High Pressure Fuel Pump.
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