P1109

DTC P1109 - Variable Geometry Induction Solenoid Electrical Fault




Circuit Description
The Variable "Geometry Induction System (GIS)" is used to add more responsive acceleration to the dual overhead camshaft (DOHC) engines. Under certain conditions, the powertrain control module (PCM)/engine control module (ECM) activates the VGIS solenoid allowing stored vacuum to actuate the secondary throttle control valve. The secondary throttle control valve then opens the secondary throttle plates, which are internal to the intake manifold and plenum assembly. This allows for increased airflow into the engine, creating more responsive acceleration. This Diagnostic Trouble Code (DTC) sets if the output is shorted high or low.

Conditions for Setting the DTC
- Ignition voltage is greater than or equal to 10 volts.
- Engine run time is greater than 0 seconds.

Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will not illuminate.
- The PCM/ECM will store conditions which were present when the DTC was set as Failure Records data only.
- This information will not be stored in the Freeze Frame data.

Conditions for Clearing the MIL/DTC
- A history DTC will clear after 40 consecutive warm up cycles without a fault.
- DTC P1106 can be cleared by using the scan tool CLEAR INFO function or by disconnecting the PCM/ ECM battery feed.

Steps 1 - 6:

Steps 7 - 15:

Test Description
The number(s) below refer to step(s) on the diagnostic table.
1. The On-Board Diagnostic (OBD II) System Check prompts the technician to complete some basic checks and store the freeze frame and failure records data on the scan tool if applicable. This creates an electronic copy of the data taken when the malfunction occurred. The information is then stored on the scan tool for later reference.
2. Listen for an audible click when the solenoid operates. Be sure that both the ON and the OFF states are commanded. Repeat the commands as necessary.
3. This check can detect a partially shorted coil which would cause excessive current flow. Leaving the circuit energized for 2 minutes allows the coil to warm up. When warm, the coil may open amps drop to 0), or short amps go above 0.75).
13. If no trouble is found in the control circuit the connection at the PCM/ECM, the PCM/ECM may be faulty. However, this is an extremely unlikely failure. The replacement PCM/ECM must be reprogrammed. Refer to the latest Techline procedure for PCM/ECM reprogramming.