Electronic Linear EGR Valve

Linear EGR System Check Chart:

Linear EGR System Circuit:

Circuit Description:
To control Exhaust Gas Recirculation (EGR), the control module operates the linear EGR valve. The linear EGR valve is a small motor with a pintle that is normally closed. By providing a ground path, the PCM will open the pintle and allow exhaust gasses to pass through the valve. The control module control of the EGR is based on the following inputs:

- Engine coolant temperature - above 25°C.

- TP - "OFF" idle.

- MAP.

- IAT, if equipped.

- BARO.

- Park/neutral position switch.

- Pintle position sensor.

If DTC 23 is stored,

If DTC 32 is stored, Powertrain Controls - ECM/PCM. This chart is used for fbulty valve, plugged EGR passages, or improper wiring connections.

Test Description: Number(s) below refer to circled number(s) on the diagnostic chart.

1. At idle, the EGR valve should not be open greater than 3%. A misadjusted Park/Neutral Position (PNP) switch or the EGR valve stuck open will allow exhaust gasses to enter the combustion chamber and create a rough idle condition.

2. Checks the pintle's ability to he manually commanded to the desired positions.

3. Checks the electrical circuit of the EGR valve and connecting components.

4. Checks for plugged EGR passages or a faulty EGR valve.