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Vauxhall Workshop Service and Repair Manuals

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DTC P1409 > < DTC P2122, P2123, P2127, P2128, or P2138

Astra J

DTC P2101

Diagnostic Instructions

    •  Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    •  Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2101 03:  Inlet Air Flow Valve Control Circuit Low Voltage

DTC P2101 39:  Inlet Air Flow Valve Control Circuit Internal Malfunction

DTC P2101 51:  Inlet Air Flow Valve Control Circuit Malfunction

DTC P2101 52:  Inlet Air Flow Valve Control Circuit Malfunction

DTC P2101 54:  Intake Air Flow Valve Control Circuit High Temperature

DTC P2101 59:  Inlet Air Flow Valve Control Circuit Malfunction

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Control 1

P2102 02, P2101 03

P2100 04, P2101 54

P2103 01

P2101 59, P2101 39, P2101 51, P2101 52

Control 2

P2102 02, P2101 03

P2100 04, P2101 54

P2103 01

P2101 59, P2101 39, P2101 51, P2101 52

Circuit/System Description

A throttle plate actuator is used to achieve high exhaust gas recirculation rates. It increases the pressure difference between exhaust and inlet so that the appropriate exhaust quantity can be mixed with the inlet air. The ECM transmits the desired angle as a PWM signal to the throttle plate actuator. The throttle plate actuator operates the DC motor to control the throttle plate based on the PWM signal from the ECM. The throttle plate position is monitored by an internal position sensor.

Conditions for Running the DTC

    •  The ignition is ON or the engine is running.
    •  The throttle actuator motor is commanded ON or OFF.
    •  The ignition voltage is less than 16 V.
    •  The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects an open, short to ground, or a short to voltage on the throttle actuator control circuit for greater than 1 s.

Action Taken When the DTC Sets

DTC P2101 is a Type A DTC.

Conditions for Clearing the DTC

DTC P2101 is a Type A DTC.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

  1. Ignition ON, command the Inlet Air Flow Valve Position ON and OFF with a scan tool. The throttle plate should respond to the scan tool commands.
  2. Observe the scan tool DTC information parameter. DTCs P2100, P2101, P2102 or P2103 should not set.
  3. 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. Ignition OFF, disconnect the harness connector at the Q38 Throttle Body.
  2. Ignition ON, connect a test lamp between control circuit terminal 2 and ground. The test lamp should illuminate.
    3. ⇒ If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, connect a test lamp between control circuit terminal 6 and ground. The test lamp should illuminate.
    4. ⇒ If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Ignition OFF, disconnect the harness connector X1 at the K20 Engine Control Module.
  5. Ignition ON, connect a test lamp between the control circuit terminal 6 and ground. The test lamp should not illuminate.
    6. ⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  6. Ignition ON, connect a test lamp between the control circuit terminal 2 and ground. The test lamp should not illuminate.
    7. ⇒ If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  7. If all circuits test normal, replace the Q38 Throttle Body.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References for ECM replacement, setup, and programming

DTC P1409 > < DTC P2122, P2123, P2127, P2128, or P2138