LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> GMC >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - V6 >> Trouble Code Charts >> Code 35, Idle Speed Error 2.5L & 4.3L Turbo >> PCV Valve
April 5, 2026: LEMON Manuals is launched! Read the announcement.

PCV Valve

The wrong PCV valve may cause incorrect idle speed.

CODE 35 ECM TERMINAL & CIRCUIT WIRING ID (2.5L)

Application ECM Terminal Wire Color
A Coil High C5 Lt. Blue/Wht.
A Coil Low C6 Lt. Blue/Blk.
B Coil High C4 Lt. Grn./Wht.
B Coil Low C3 Lt. Grn./Blk.
CODE 35 ECM TERMINAL & CIRCUIT WIRING ID (4.3L TURBO)

Application ECM Terminal Wire Color
A Coil High GE6 Lt. Blue/Wht.
A Coil Low GE5 Blue/Blk.
B Coil High GE4 Lt. Grn./Blk.
B Coil Low GE3 Lt. Grn.
Fig 1: Code 35 Schematic (2.5L & 4.3L Turbo) Idle Speed Error
G91E07428
Fig 2: Code 35 Flow Chart (2.5L & 4.3L Turbo) Idle Speed Error
G91C07333