DTC P00C7 (LUJ)
Diagnostic Instructions
DTC Descriptor
| DTC P00C7 00: Intake Air Pressure Measurement
System - Multiple Sensors Not Plausible |
Circuit/System Description
The boost pressure sensor is integrated with the intake air
temperature (IAT) sensor. The boost pressure sensor measures the
range of pressures between the turbocharger and the throttle body.
Pressure in this portion of the induction system is affected by the
following:
| • |
Turbocharger boost
pressure |
| • |
Barometric pressure
(BARO) |
| • |
Efficiency of the charge air
cooler |
The sensor provides a signal voltage to the Engine Control
Module (ECM), relative to the pressure changes, on the boost
pressure sensor signal circuit. Under normal operation the greatest
pressure that can exist in this portion of the induction system at
ignition ON, engine OFF is equal to the BARO. When the vehicle is
operated at wide open throttle (WOT) the turbocharger can increase
the pressure to near 240 kPa. The least pressure that occurs is
when the vehicle is idling or decelerating, and it is equal to the
BARO.
Conditions for Running the DTC
| • |
This DTC runs continuously
within the enabling conditions |
Conditions for Setting the DTC
The ECM detects not plausible boost pressure sensor signal
Action Taken When the DTC Sets
DTCs P00C7 00 is a type C DTCs
Conditions for Clearing the DTC
DTCs P00C7 00 is a type C DTCs
Diagnostic Aids
Review the freeze frame/failure records with a scan tool.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
| 1. |
Engine running, observe the
DTC information with a scan tool. DTC P00C7 00 should not
set. |
| 2. |
Operate the vehicle within the
conditions for running the DTC to verify the DTC does not reset.
You may also operate the vehicle within the conditions that you
observed from the freeze frame/failure records data. |
Circuit/System Testing
| 1. |
Verify none of the following
conditions exist: |
| |
• |
The air intake duct system for
loose connecting clamps, cracks, or other damage |
| |
• |
A damaged Q38 Throttle Body
blade or shaft |
| |
• |
Splits, kinks, or improper
connections at the vacuum hoses |
| |
• |
Faulty positive crankcase
ventilation system operation |
| |
• |
Carbon deposits on the
throttle blade. Clean throttle blade as necessary |
| |
• |
Vacuum leaks at the intake
manifold, Q38 Throttle Body, Q17 Fuel Injector O-rings, and B65
Intake Manifold Pressure and Air Temperature Sensor. |
| 2. |
If all conditions test normal,
test the engine for proper camshaft timing. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|
