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Home >> GMC >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 7.4L >> Trouble Code Charts >> Code 35, Idle Speed Error >> PCV Valve
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PCV Valve

The wrong PCV valve may cause incorrect idle speed.

CODE 35 TERMINAL & CIRCUIT WIRING IDENTIFICATION

Application PCM Terminal Wire Color
"C" & "K" Series
7.4L A/T & M/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
"G" Series
7.4L 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
"P" Series
7.4L 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
Fig 1: Code 35 Schematic (7.4L) Idle Speed Error
G91E07428
Fig 2: Code 35 Flow Chart (7.4L) Idle Speed Error
G91E07334