DTC P1665 Evaporative Emission (EVAP) Vent Solenoid Control Circuit
Output Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transmission functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. DTC P1665 set indicates an improper voltage level has been detected on the output circuit which controls the EVAP Canister Vent Solenoid Valve.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
An improper voltage level has been detected on the output circuit which controls the EVAP Canister Vent Solenoid Valve.
The above conditions are present for at least 30 seconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame/Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the malfunction indicator lamp (MIL) during the third consecutive trip in which the diagnostic has run and passed.
The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using a scan tool.
Check for the following conditions:
Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a voltmeter connected between the solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the solenoid. A change in voltage will indicate the location of the malfunction.
Review the Fail Records vehicle mileage since the diagnostic test last failed. This may help determine how often the condition that caused the DTC to be set occurs.
The number(*) below refer to the step number(*) on the diagnostic table.
The powertrain OBD System Check prompts you to complete some basic checks and store the freeze frame and failure records data on the scan tool.
Listen for an audible click when the Vent solenoid operates. Command both the ON and OFF states. Repeat the commands as necessary.
Tests for voltage at the feed side of the solenoid.
Verifies that the PCM is providing ground to the solenoid.
Tests if ground is constantly being applied to the solenoid.
The PCM utilizes Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is replaced, the new PCM must be programmed.