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PCV Valve

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The wrong PCV valve may cause incorrect idle speed.

CODE 35 TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application ECM/PCM Terminal Wire Color
"C" & "K" Series
4.3L
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
"G" Series
4.3L A/T
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
"L" & "M" Series
4.3L
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
"P" Series
4.3L
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
"S" & "T" Series
4.3L (VIN W) Pickup & A/T Utility
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
4.3L (VIN Z) A/T Pickup
IAC Coil "A" Hi A3 LT BLU/WHT
IAC Coil "A" Lo A6 LT BLU/BLK
IAC Coil "B" Hi A8 LT GRN/WHT
IAC Coil "B" Lo A7 LT GRN/BLK
Fig 1: Code 35 Schematic (4.3L) Idle Speed Error
G91E07428
Fig 2: Code 35 Flow Chart (4.3L) Idle Speed Error
G91E07334