P2101-ELECTRONIC THROTTLE CONTROL MOTOR PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Exhaust Gas Recirculation (EGR) Air Flow Control Valve is a two-wire electrically operated throttle valve motor used to assist the EGR system function by creating a vacuum in the intake system to draw exhaust gas into the intake manifold. The Solenoid receives 12 volts from the PCM/ASD relay and a pulse-width modulated ground signal from the PCM. With the solenoid de-energized (off) the throttle valve is in the open (full flow) position. When the PCM energizes (grounds) the throttle motor, the throttle valve closes creating a low pressure (vacuum) in the intake system. This low pressure effect helps draw exhaust gases from the EGR Valve into the intake system. When this DTC is active, the EGR System and DPF regeneration is disabled.

• When Monitored:

  With the ignition on and the Powertrain Control Module (PCM) Exhaust Gas Recirculation (EGR) Air Flow Control Valve command off.

• Set Condition:

  The Powertrain Control Module (PCM) detects an implausible signal on the EGR Air Flow Control Valve Control circuit for 0.5 seconds.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

1. CHECK FOR ACTIVE DTC

• Go To 2

• Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. CHECK FOR HIGH RESISTANCE IN THE (K312) EGR AIR FLOW CONTROL VALVE CONTROL CIRCUIT

• Go To 3

• Repair the (K312) EGR Air Flow Control Valve Control circuit for an open or high resistance.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

3. CHECK FOR HIGH RESISTANCE IN THE (Z904) GROUND CIRCUIT

• Go To 4

• Repair the (Z904) Ground circuit for an open or high resistance.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
  

4. EGR AIR FLOW CONTROL VALVE

• Replace the EGR Air Flow Control Valve in accordance with the service information.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

• Replace and program the Powertrain Control Module in accordance with the service information.
• Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).