EGR Problem

WARNING: This page is about a different car, the 1993 Pontiac Grand Prix, 1993 Pontiac Firebird, 1993 Oldsmobile Cutlass Supreme, 1993 Chevrolet Lumina, and 1993 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

EGR valve sticking open at idle is usually accompanied by a rough idle and/or stalling.

Also check for shorted or leaking injector and fuel-contaminated oil. If Code 45 is intermittent, see INTERMITTENTS in TESTS W/O CODES article in this section.

CODE 45 ECM TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application	ECM Terminal	Wire Color
3.4L "W" Body
O2 Signal	A16	Purple
O2 Ground	A22	Tan
3.4L (VIN S) "F" Body
Left O2 Signal	B21	Purple/White
Left O2 Ground	B20	Black/White
Right O2 Signal	B22	Purple
Right O2 Ground	B23	Black/White

Fig 1: Code 45 Schematic (All Models) Rich Exhaust Indication

Fig 2: Code 45 Flow Chart (All Models) Rich Exhaust Indication