wiring schematic 2002 Trailblazer ABS


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1995 Honda Accord LX TROUBLE SHOOTING ANTI-LOCK (ABS) WARNING LIGHT

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Filed Under (Honda) by admin on 15-12-2010

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NOTE: Diagnostic Trouble Code (DTC) Recognition 1. ABS control unit recognizes system related problems and causes ABS warning light to come on and stay on under any of following conditions: Vehicle is driven with parking brake on longer than 30 seconds. One rear wheel is locked. Wheel speed sensor does not transmit a signal. Vehicle is driven on extremely rough road. Low battery voltage. Operation time of solenoid valves exceeds a specified value and control unit indicates an open circuit in solenoid circuit. Output signals from control unit are not transmitted to solenoid valves. Temporary loss of traction due to excessive cornering speed or starting from stuck condition (mud, snow or sand). 2. If ABS warning light comes on intermittently, use ABS Tester (07HAJ-SG0010B) to confirm problem. See ABS FUNCTION TEST under DIAGNOSIS & TESTING. 3. ABS warning light comes on and trouble code is stored in control unit when insufficient battery voltage exists at control unit. If low battery voltage caused problem, recharge battery and clear trouble code(s). See CLEARING DTCs under SELF-DIAGNOSTICS. ABS Warning Light Does Not Come On If ABS warning light does not come on when ignition is on: Check bulb. Check Yellow wire between fuse No. 1 and instrument cluster. Check Blue/White wire between instrument cluster and control unit. Check control unit ground circuit. ABS Warning Light Stays On Without DTCs If ABS warning light stays on and no DTCs have been stored in control unit, check for following items: Loose or poor control unit connector. Blown ABS fuse No. B2 in underhood fuse/relay box. Open circuit in White/Black wire between ABS fuse No. B2 and control unit. Open circuit in Yellow/Black wire between fuse No. 7 and fail-safe relays. ABS system is okay if ABS warning light goes out after engine is started.

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Technical Bulletin SUBARU IMPREZA – ABS SYSTEM PROBLEM

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Filed Under (Subaru) by admin on 17-04-2010

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Fault ABS warning light constantly “ON” with no ABS operation. Callers often remark that they are unable to communicate with the ABS ECM even though using suitable diagnostic equipment.
Cause The ABS ECM / hydraulic modulator / ABS pump units are a combined unit assembly and are located behind the off side front headlamp. The caller reported that the harness plug was full of water and the terminals were found to be excessively corroded, to the point were the harness plug and ABS ECM needed replacing. The caller also reported that this was the second time he
had experienced the problem on Subaru Impreza vehicles. Vehicles
Rectification
If the terminals on both the ABS ECM and ABS ECM harness plug are heavily corroded beyond cleaning and repair, it will be necessary to replace both the ABS ECM / hydraulic modulator / ABS pump assembly in addition to the ABS ECM harness plug

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2005 Mazda 6 ABS/TCS HU/CM REMOVAL/INSTALLATION

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Filed Under (Mazda) by admin on 18-10-2010

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Caution: When replacing the ABS/TCS HU/CM, the configuration procedure must be done before removing the ABS/TCS HU/CM. If the configuration is not completed before removing the ABS/TCS HU/CM, TCS will not work properly after installation of the ABS/TCS HU/CM. Do not drop the ABS/TCS HU/CM. Replace it if it is subjected to an impact. 1. Configure the ABS/TCS HU/CM (only when replacing it). 2. Remove in the order indicated in the table. 3. Install in the reverse order of removal. Connector Removal Note 1. Release the lock lever to unlock it. 2. Remove the connector. Brake Pipe Removal Note 1. Mark the brake pipe connecting positions before removal for reference during installation. ABS/TCS HU/CM Removal/Installation Note 1. When removing/installing the ABS/TCS HU/CM from/to the vehicle, attach a strip of protective tape on the ABS/TCS HU/CM connector to prevent brake fluid from entering. Brake Pipe Installation Note 1. When installing the brake pipe, align the marks made before removal with the ABS/TCS HU/CM as shown in the figure. Connector Installation Note 1. Verify that the lock lever of the harness connector is securely locked.

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Technical Bulletin FORD FOCUS – ABS WHEEL SPEED SENSORS

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Filed Under (Ford) by admin on 17-04-2010

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Ford Focus models fitted with ABS use Wheel speed sensor reluctors which are housed within the front wheel bearings, therefore correct fitment of the wheel bearings is critical. To ensure correct fitment the front wheel bearings are colour coded at each end. The Front wheel bearings should be fitted into the hubs so that the black ends of the wheel bearings are mounted inboard and the orange ends of the wheel bearings are mounted outboard

The ABS self diagnostic system has the same characteristics as the Ford Mondeo vehicles, i.e. any non-permanent induced fault detected by the ABS ECM, such as wheel rotation with the ignition switched “ON” (e.g. when carrying out an MOT brake test etc) will cause the ABS warning light (MIL) to illuminate. To reset the ABS system and turn off the ABS warning light (MIL), drive the vehicle and if the ABS ECM does not detect any faults in the ABS system, the ABS warning light (MIL) will then
turn off

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2006 Honda Civic Rear ABS Wheel Speed Sensor and O-Ring Inspection

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Filed Under (Honda) by admin on 10-01-2011

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During assembly, some wheel speed sensors may have been improperly installed and do not seal the hub assembly. Water may enter the hub assembly and damage the wheel bearing. In areas where road salt is used, the wheel bearings may corrode, which may cause the wheel to separate and fall off, increasing the risk of a crash. CORRECTIVE ACTION Inspect both rear ABS wheel speed sensors and their O-rings. If an ABS wheel speed sensor or O-ring is damaged, replace the damaged part and the hub bearing unit on that wheel. REPAIR PROCEDURE 1. 2. 3. 4. Raise the vehicle on a lift. Remove the rear wheels. Remove both rear ABS wheel speed sensors. Inspect the rear ABS wheel speed sensors and their O-rings. • If a rear ABS wheel speed sensor O-ring is damaged (cut, torn, pinched, or flattened), replace the O-ring and the corresponding rear hub bearing unit, then go to step 5. DAMAGED O-RINGS: O-ring is pinched. • If the rear ABS wheel speed sensor tip has any physical damage, remove the original sensor assembly, replace the corresponding rear hub bearing unit(s), and connect the new sensor’s wire harness. Then go to step 5. – Refer to page 18-34 (with disc brakes) or 18-36 (with drum brakes) of the 2006–07 Civic Service Manual, or – Online, enter keyword HUB, then select Rear Knuckle/Hub Bearing Unit Replacement from the list. O-ring is rolled out of the groove and flattened. -Refer to page 18-34 (with disc brakes) or 18-36 (with drum brakes) of the 2006–07 Civic Service Manual, or – Online, enter keyword HUB, then select Rear Knuckle/Hub Bearing Unit Replacement from the list. • If the rear ABS wheel speed sensors and their O-rings are OK, go to step 5. 5. Lubricate the ABS wheel speed sensor O-ring and the sensor hole in the knuckle with multi-purpose grease.

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