Originally Posted by
rla2005
There is no way for this vintage truck to measure EGR flow. DTC 332 indicates the PCM is not sensing the opening of the EGR valve. Later models that use a DPFE sensor instead of the EVP on top of the EGR valve have this capability. Unless someone swapped in an EGR system and PCM that senses EGR flow code.
The closed EGR EVP signal should be between .2 and .67 VDC. The fully open position should be at or above 3.90 VDC.
My manual (which differentiates truck from car codes) states #332 as "insufficient flow", specifically.
With other codes specific to a EGR "closed" condition, like #328 & #334, voltage lower or higher than expected respectively for EGR closed valve position.