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1994 GMC C2500 Pickup CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
A/C & HEATER SERVICE PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
Computer Relearn Procedures -> General Motors Corp. -> 1997-98 -> 1998-2000 -> 1998-99 -> 1999-2001 -> 1999-2002 -> 2.2L & 2.4L Engines -> 2000-02 -> 2000-04 -> 2001-02 -> 2001-04 -> 3.1L, 3.4L, 3800/3.8L, 4.0L & 4.6L Engines -> 3.5L Engine -> 5.7L Engine -> Achieva, Alero, Grand Am & Skylark -> Achieva, Cavalier, Skylark & Sunfire -> Alero & Grand Am -> Alero & Malibu -> Aurora -> Aurora, Bonneville, DeVille, LeSabre & Seville -> Aurora, Bonneville, Grand Prix, LeSabre & Park Avenue -> Auto Learn Passlock Procedure -> Body Control Module (BCM) -> Bonneville -> Bonneville, Eighty Eight, LeSabre, LSS & Park Avenue -> C & K Series w/Diesel Engine -> C & K Trucks w/Diesel Engine -> Camaro & Firebird -> Catera -> Cavalier & Sunfire -> Century -> Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo & Regal -> Century, Impala, Intrigue, Monte Carlo & Regal -> Corvette -> Crankshaft Position System Variation Learn -> Cutlass & Malibu -> Dash Integration Module (DIM) -> DeVille -> DeVille, Eldorado & Seville -> EEPROM -> Eldorado -> Engine Control Module (ECM) -> Engine Performance -> Except Park Avenue -> Grand Am -> Grand Prix & Regal -> Impala & Monte Carlo -> Instrument Panel Integration Module (IPM) -> Intrigue -> LeSabre -> Less Tech 2 Or Techline Terminal -> Light Truck & Vans -> Park Avenue -> Passenger Cars -> Passkey Module -> Passlock Learn Procedure -> PCM -> Powertrain Control Module (PCM) -> Powertrain Control Module (PCM) & Vehicle Control Module (VCM) -> Rear Integration Module -> Riviera -> Seville -> T50/T60/T20+ -> TDC Offset Adjustment -> Theft Deterrent System Programming -> VCM -> With Tech 2 -> With Techline Terminal & Scan Tool
Vehicle: 1994 GMC C2500 Pickup Sierra 6.5 V8 DIESEL
Passenger Cars
Body Control Module (BCM)
Alero & Grand Am
This procedure must be performed if the BCM, Passlock sensor or PCM is replaced. If BCM is not properly programmed, it will not control all the features properly.
- Ensure battery is fully charged and ignition switch is in the ON position.
- Connect a suitably programmed Tech II, or equivalent, scan tool to Data Link Connector (DLC).
- Access scan tool "Special Functions" menu and follow scan tool instructions to program BCM.
- If BCM fails to accept the pr...
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BRAKE SERVICE PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
Disc Brakes -> Bendix Single Piston Sliding Caliper -> Troubleshooting
Vehicle: 1994 GMC C2500 Pickup Sierra XC 7.4 V8 GAS
Refer to "Troubleshooting," as out...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Fuel Filter Replacement -> 6.5L Diesel Engine
Vehicle: 1994 GMC C2500 Pickup Sierra XC 6.5 V8 DIESEL
On models equipped with fuel injected engines, relieve fuel system pressure as outlined under "Fuel System Pressure Relief."
On models equipped with metal collar quick disconnect connectors, GM tool No. J37088-A, or equivalent, will be required to disconnect the connector. Prior to reconnecting the connector, apply a few drops of clean motor oil to the male pipe ends.
On models equipped with plastic collar quick disconnect connectors, squeeze the connector plastic retainer release tabs to release the connector. Prior to reconnecting the connector, apply a few drops of clean motor...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
DRIVESHAFT U-JOINT, Replace -> Assemble -> Disassemble
Vehicle: 1994 GMC C2500 Pickup Sierra 5.0 V8 GAS
Never clamp propeller shaft tubing in a vise. Clamping could dent or deform the tube causing an imbalance or unsafe condition. Always clamp on one of the yokes and support the shaft horizontally. Avoid damaging the slip yoke sealing surface. Nicks may damage the bushing or cut the lip seal.
Disassemble
- Support propeller shaft in a line horizontal with table of a press.
- Mark propeller shaft in order to show which end connects to transmission and which end goes to rear axle.
- On models equipped with external snap ring retainers, proceed as follows:
- Disassemble snap rings by ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
Alternator, Replace
Vehicle: 1994 GMC C2500 Pickup Sierra 7.4 V8 GAS
- Disconnect battery ground cable.
- Disconnect terminal plug and battery lead from rear of alternator.
- Remove accessory drive belt.
- Remove alternator mounting bolts.
- Separate alternator from mounting bracket.
- Reverse procedure to ...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
General Motors Corp./Saturn Trucks -> Reduce Engine Power Indicator Lamp ->
Vehicle: 1994 GMC C2500 Pickup Sierra 6.5 V8 DIESEL
The Reduce Engine Power indicator lamp should light for a approximately 3 seconds when the ignition is turned On as a bulb check. If the warning lamp turns On during vehicle operation, a vehicl...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 1994 GMC C2500 Pickup Sierra XC 6.5 V8 DIESEL
Lower
- Drain cooling system into a suitable container.
- Reposition hose clamp from radiator.
- Remove radiator outlet hose from radiator.
- Reposition hose clamp from coolant pump.
- Remove radiator outlet hose from coolant pump and from vehicle.
- Reverse procedure...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1994 GMC C2500 Pickup AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1994 GMC C2500 Pickup Sierra 5.7 V8 GAS
- Rotate tensioner counterclockwise, using a 1/2 inch breaker bar with a socket placed on tensioner ...
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COMPONENT LOCATION DIAGRAMS FOR 1994 GMC C2500 Pickup AUTOMOBILES
Component location diagrams for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. from 1990+.
Vehicle Speed Sensor Diagram for 1994 GMC C2500 Pickup Sierra 7.4 V8 GAS Components on diagram: |
ECM Wiring Diagram for 1994 GMC C2500 Pickup Sierra 5.7 V8 GAS Components on diagram: |
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WIRING DIAGRAMS FOR 1994 GMC C2500 Pickup AUTOMOBILES
OEM drawn wiring diagrams for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S.
1994 GMC C2500 Pickup Sierra 4.3 V6 GAS Wiring Diagram Components on diagram: |
1994 GMC C2500 Pickup Sierra XC 6.5 V8 DIESEL Wiring Diagram Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1994 GMC C2500 Pickup AUTOMOBILES
OEM TSB listings for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. from 1985+.
Document: Car and Truck Fix It Right the First Time Issues Vehicle: 1994 GMC C2500 Pickup Sierra 4.3 V6 GAS Auto Systems: |
Document: Bumps or Rust Colored Spots in Paint Due to Rail or Iron Dust Vehicle: 1994 GMC C2500 Pickup Sierra 4.3 V6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1994 GMC C2500 Pickup AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 1994 GMC C2500 Pickup cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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