vacuum line gmc yukon diagram


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2004 Jeep Grand Cherokee Limited DIAGNOSIS AND TESTING – VACUUM RESERVOIR

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Filed Under (Jeep) by admin on 18-11-2010

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1. Disconnect vacuum hose at speed control servo and install a vacuum gauge into the disconnected hose. 2. Start engine and observe gauge at idle. Vacuum gauge should read at least ten inches of mercury. 3. If vacuum is less than ten inches of mercury, determine source of leak. Check vacuum line to engine for leaks. Also check actual engine intake manifold vacuum. If manifold vacuum does not meet this requirement, check for poor engine performance and repair as necessary. 4. If vacuum line to engine is not leaking, check for leak at vacuum reservoir. To locate and gain access to reservoir, refer to Vacuum Reservoir REMOVAL /INSTALLATION . Disconnect vacuum line at reservoir and connect a hand-operated vacuum pump to reservoir fitting. Apply vacuum. Reservoir vacuum should not bleed off. If vacuum is being lost, replace reservoir. 5. Verify operation of one-way check valve and check it for leaks. a. Locate one-way check valve. The valve is located in vacuum line between vacuum reservoir and engine vacuum source. Disconnect vacuum hoses (lines) at each end of valve. b. Connect a hand-operated vacuum pump to reservoir end of check valve. Apply vacuum. Vacuum should not bleed off. If vacuum is being lost, replace one-way check valve. c. Connect a hand-operated vacuum pump to vacuum source end of check valve. Apply vacuum. Vacuum should flow through valve. If vacuum is not flowing, replace one-way check valve. Seal the fitting at opposite end of valve with a finger and apply vacuum. If vacuum will not hold, diaphragm within check valve has ruptured. Replace valve.

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2003 GMC Yukon 5.3L, Lean trouble codes P0171, P0174, P0101 and P0300 are setting

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Filed Under (GM) by admin on 11-06-2010

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2001 Chevrolet Suburban 1500 5.3L 2003 GMC Yukon 5.3L, FLEX, Vin Z 2003 Cadillac Escalade 6.0L, Vin N, 2003 GMC Yukon XL 1500 5.3L, FLEX, Vin USA/Canada Z 1. Check for leaking intake manifold seals around the intake ports. The intake gasket seals may be leaking around the intake ports, causing a lean condition. Many times they will leak around the bottom side of the port, making it a challenge to detect the vacuum leak. May also note lower than normal Mass Airflow (MAF) readings if the seals are leaking around the ports. 2. If leaking intake gasket seals are found, replace the gaskets with the updated part number.

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2005 GMC Yukon/ Denali XL 1500 Blower Motor Control Processor Replacement

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Filed Under (GM) by admin on 14-10-2010

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1. If equipped, remove the sound insulator panel. 2. Disconnect the electrical connector at the blower motor. 3. Disconnect the electrical connector (4) from the blower motor control processor (2). 4. Remove the blower motor control processor retaining screws (3) from the HVAC module (1). 5. Remove the blower motor control processor (2) from the HVAC module (1). INSTALLATION PROCEDURE 1. Install the blower motor control processor (2) to the HVAC module (1). 2. Install the blower motor control processor retaining screws. NOTE: Refer to Fastener Notice in Service Precautions. Tighten the screws to 1.6 N.m (14 lb in). 3. Connect the electrical connector (4) to the blower motor control processor (2). 4. Connect the electrical connector at the blower motor. 5. If equipped, install the sound insulator panel.

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2005 Chevrolet Malibu Vacuum Brake Booster Check Valve and/or Hose Replacement Removal Procedure

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Filed Under (Chevrolet) by admin on 19-10-2010

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1. Disconnect the brake booster vacuum check valve (1) from the brake booster. 2. If the vacuum check valve (1) needs to be separated from the vacuum hose (3), release and reposition the clamp (2) on the vacuum hose (3) and remove the check valve (1) from the hose (3). 3. If replacing the vacuum check valve (1), remove the grommet (4) from the brake booster and discard the grommet. 4. If removing the vacuum hose (2), take note of the vacuum hose routing then disconnect from the engine intake manifold connection (3) by releasing tension on the vacuum hose clamp (1) and sliding the vacuum hose (2) off the intake manifold connection (3). Installation Procedure Important: A small amount of denatured alcohol can be used as an assembly aid when installing the vacuum check valve and/or grommet. Do NOT use soap. 1. If the vacuum hose (2) was removed, install the vacuum hose into position on the vehicle as noted prior to removal, then connect the vacuum hose (2) to the engine intake manifold connection (3) and secure with the vacuum hose clamp (1). 2. If the vacuum check valve (1) is being replaced, install a NEW grommet (4) to the brake booster. 3. If the vacuum check valve (1) was separated from the vacuum hose (3), install the check valve (1) to the vacuum hose (3). Install and secure the clamp (2) into position on the hose (3). 4. Connect the brake booster vacuum check valve (1) to the brake booster.

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| Sierra, Silverado, Suburban, Tahoe, Yukon (VIN C/K) Service Manual | 2001 GMC Truck GMC K Sierra – 4WD

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Filed Under (GM) by admin on 12-06-2010

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Test Description The numbers below refer to the step numbers on the diagnostic table. 2. Allow the engine to cool before performing this test. If the sensor is at the operating temperature, the HO2S voltage will stay high or low. If the HO2S voltage stays between 300-700 mV this indicates the HO2S heater is inoperative. 3. If more than one HO2S DTC is set, this is a good indication that the HO2S fuse is open. Test all the related circuits going to all the heated oxygen sensors for a short to ground. If you cannot locate a shorted circuit, it may be necessary to disconnect each HO2S one at a time to locate a shorted sensor. 4. This step determines if an ignition positive voltage supply is available at the sensor.

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