2010 Cadillac CTS Sedan AWD V6-3.6L Page 1207
The high pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs
to synchronize the high pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting
the portion of each pump stroke that provides fuel to the rail.
The ECM monitors the fuel rail fuel pressure sensor and the high pressure fuel pump actuator to determine if the commanded and actual pressure
are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.
Conditions for Running the DTC
P0089, P228C, or P228D
* DTC P0090, P0091, P0092, P0191, P0192, or P0193 is not set.
* The ignition voltage is less than 18 V.
* The deceleration fuel cut-off (DFCO) is inactive.
* The engine speed is greater than 25 RPM.
* The air bag is not deployed.
* The DTCs run continuously when the above conditions are met for 5 s.
P00C6
* DTC P0090, P0091, P0092, P00C8, P00C9, P00CA, P0116, P0117, P0118, P0128, P0192, P0193, P0335, P0336, P0340, P0341, P0345,
P0346, P0365, P0366, P0390, P0391, P0627, P0628, P0629 are not set.
* The ignition voltage is more than 8 V.
* The engine coolant temperature is between -100 and +65掳C (-148 and +149掳F).
* The low side fuel pressure is more than 0 kPa (0 psi).
* The engine is not running.
* The DTC runs once for each engine start.
Conditions for Setting the DTC
P0089
The high pressure fuel pump actuator command necessary to maintain the desired fuel rail pressure is +/-2.5 MPa (363 psi) of the command
expected by the controller. The condition exists for greater than 5 s.
P00C6
The ECM detects that the fuel pressure is not rising or has fallen beyond acceptable limits during engine cranking.
P228C
The actual fuel rail pressure is 1.5 MPa (218 psi) less than the desired fuel pressure. The condition exists for greater than 5 s.
P228D
The actual fuel rail pressure is 3.6 MPa (522 psi) greater than the desired fuel rail pressure. The condition exists for greater than 5 s.
Action Taken When the DTC Sets
* DTCs P0089 and P00C6 are Type B DTCs.
* DTCs P228C and P228D are Type A DTCs.
* A message center or an indicator displays Reduced Engine Power.
Conditions for Clearing the DTC
* DTCs P0089 and P00C6 are Type B DTCs.
* DTCs P228C and P228D are Type A DTCs.
Diagnostic Aids
* A condition with the fuel tank fuel pump module or fuel pump flow control module may set these DTCs.
* A skewed fuel rail pressure sensor, or an intermittent condition in the fuel rail pressure sensor circuits may set these DTCs.
* A leaking or restricted fuel injector may set DTC P0089.
* A short to voltage in the crankshaft position signal circuit may set a DTC.
* A short to voltage in the camshaft position actuator solenoid valve control circuit may set a DTC.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
