My apologies, should have known it would be on a California vehicle.
I haven't been able to find a location for this module in either of my online applications. I'll open this one back up to see if anyone else can assist. Good luck.
The system consists of:
When the PCM supplies a ground signal to the EGR valve vacuum regulator solenoid, EGR system operation starts to occur. The PCM will monitor and determine when to supply and remove this ground signal. This will depend on inputs from the engine coolant temperature, throttle position and intake manifold air temperature sensors.
When the ground signal is supplied to the EGR solenoid, vacuum from the vacuum pump will be allowed to pass through the EGR solenoid and on to the EGR valve with a connecting hose.
Exhaust gas recirculation will begin in this order when:
The EGR system will be activated at engine idle speed. This is if PCM operating parameters for EGR system operation have been met.
The EGR system will be shut down briefly if the PCM has determined that a rapid acceleration is occurring. This is determined by a change in TPS voltage (mechanical throttle movement) The PCM will leave the EGR system shut down for a few additional seconds after the throttle has been depressed.
The EGR system will also be shut down for wide open throttle (WOT) conditions.
The EGR system will also be shut down by the PCM if the PCM has not sensed a TPS voltage change (mechanical throttle movement) after 2 continuous minutes. This shut down may occur at either engine idle speed or normal cruising speeds.
Each time the engine is operated, an on-board diagnostic test will be run to verify EGR system operation. Certain failures will illuminate the MIL (Malfunction Indicator Lamp) The MIL is indicated on the instrument panel as the Check Engine Lamp. Refer to the On-Board Diagnostic section for additional information. Also refer to the appropriate Powertrain Diagnostic Procedures service manual.