Diagnostic Aids

Before replacing ECM, use an ohmmeter and check EGR valve resistances. Resistance between terminals "A" and "E" should be 9.5-10.5 ohms. Resistance between terminals "B" and "D" should be greater than 3000 ohms. Resistance between terminals "B" and "C" should start at 700 ohms and increase to about 4000 ohms as pintle is slowly moved inward.

Fig 1: CODE 32, Schematic, Linear EGR System Error (4.3L S & T Series W/ CPI)

Fig 2: CODE 32, Schematic, Linear EGR System Error (4.3L C & M Series (Cal.) & 4.3L L & M Series W/ CPI)

Fig 3: CODE 32, Flowchart, EGR System Error (4.3L W/ Linear EGR)