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Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 GMC Jimmy car and truck
repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your 1991 GMC Jimmy automobile. Try the Automotix DIY solution today!
We have info for following modifications of 1991 GMC Jimmy
- 1991 GMC Jimmy 6.2 V8 DIESEL, CID:379, Fuel Injection, Aspiration:379, Engine VIN:, Desg:C
- 1991 GMC Jimmy 5.7 V8 GAS, CID:350, Fuel Injection, Aspiration:350, Engine VIN:, Desg:K
BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> General Service -> CHECKING COMPLAINTS
Vehicle: 1991 GMC Jimmy 5.7 V8 GAS
Diagnose power brakes systems as if two separate systems exist. Check for faults in the regular brake system first. If no problem exists in the regular brake system, diagnosis the power brake circuit is necessary. For a quick check of proper power unit operation, press the brake pedal firmly and then start the engine. The pedal should fall away slightly and less pressure should be needed to maintain the pedal in any position. On vacuum suspended power units, air will rush into the air intake when the brakes are applied.
To perform another check, remove the stop light switch, ...
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BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Rear Wheel Anti-Lock Brake System -> SYSTEM SERVICE -> ELECTRONIC CONTROL UNIT (ECU) -> Except G, R, P & V Models -> G, R, P & V Models -> ISOLATION/DUMP VALVE ASSEMBLY -> SPEED SENSOR -> SPEEDOMETER CALIBRATION
Vehicle: 1991 GMC Jimmy 6.2 V8 DIESEL
ELECTRONIC CONTROL UNIT (ECU)
Do not touch electrical connections and pins or allow them to come into contact with brake fluid.
- Disconnect battery ground cable.
- Disconnect electrical connectors from ECU.
- Pry up tab at rear of ECU and remove unit toward front of vehicle.
- Slide unit into bracket until tab locks into hole.
- Inspect electrical connectors for brake fluid contamination, clean with alcohol as needed, then connect electrical connectors to ECU.
ISOLATION/DUMP VALVE ASSEMBLY
- Disconnect brake lines from control valve, the plug lines and open fittings.
- Remove bolts (25) securing...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Jimmy BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> TROUBLESHOOTING
Vehicle: 1991 GMC Jimmy 6.2 V8 DIESEL
Refer to Figs. throug...
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BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
HYDRAULIC BRAKE SYSTEMS, GENERAL MOTORS -> COMPONENT DESCRIPTION -> HYDRAULIC CONTROL VALVES -> MASTER CYLINDER
Vehicle: 1991 GMC Jimmy 5.7 V8 GAS
MASTER CYLINDER
Some vehicles use a conventional tandem master cylinder with two hydraulic pistons operating in line. The primary piston controls the front brake system and the secondary piston controls the rear brake system.
Other models use a master cylinder that operates the same as the conventional master cylinder, but also incorporates a quick take-up feature in the rear chamber to reduce excessive pedal travel which may result from increased fluid displacement required to move the low drag caliper piston out against the rotor.
The quick take-up uses a spring-loaded ball...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Jimmy BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
ANTI-LOCK BRAKES, GENERAL MOTORS -> Four Wheel Anti-Lock Brake System -> DIAGNOSIS & TESTING -> CLEARING CODES -> DIAGNOSTIC CIRCUIT CHECK -> DIAGNOSTIC TESTS -> READING CODES -> WIRING DIAGRAMS
Vehicle: 1991 GMC Jimmy 5.7 V8 GAS
WIRING DIAGRAMS
Refer to "Wiring Diagrams" in "Vehicle Systems."
DIAGNOSTIC CIRCUIT CHECK
Refer to Figs. and for diagnostic circuit checks.
READING CODES
Trouble codes may be read with the TECH 1 scanner or by jumping terminal "H " of the ALDL to terminal "A" of the ALDL while observing the flashing of the "Anti-Lock" warning lamp. The terminals must be jumped for a few seconds before the code will begin.""
DIAGNOSTIC TESTS
[[table data]]CLEARING CODES
If the "Anti-Lock" warning lamp stays lit, the codes may be cleared with the TECH 1 scanner or by the following procedu...
CLICK HERE TO GET FULL ACCESS TO 1991 GMC Jimmy BRAKE SERVICE PROCEDURES
BRAKE SERVICE PROCEDURES FOR 1991 GMC Jimmy AUTOMOBILES
Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported 1991 GMC Jimmy cars and light trucks from 1990+.
POWER BRAKE UNITS, GENERAL MOTORS -> Tracker Brake Booster -> POWER BRAKE UNIT, Replace
Vehicle: 1991 GMC Jimmy 5.7 V8 GAS
Refer to Fig. , when replacing power brake unit.
- Disconnect battery ground cable.
- Remove master cylinder as follows:
- Remove air cleaner assembly, then the reservoir lead wire and pressure limit valve wire at electrical connectors.
- Remove fluid from reservoir using a syringe.
- Disconnect and plug three brake fluid lines from master cylinder assembly.
- Remove heat protector bolt from master cylinder bracket.
- Remove two master cylinder ...
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