It houses the hold and release solenoids. If voltage is out of range, correct system problem. Never connect or disconnect a hose or line containing pressure; it may whip. For updates, please visit www. Steer axle tire radius cannot be more than 20% above rears or 10% below. Disconnect sensor cable from harness.
It helps improve traction on slippery or unstable driving surfaces by preventing excessive wheel spin. They are combinations of two modulator valves and a relay valve. Coat outside of relay valve where cover joins body and connection between modulator valve and relay valve with a soap solution. Diagnostic Switch — A switch used to activate blinks codes. Probe the connector carefully so that the terminals are not damaged.
If this does not happen, verify that the sensors are properly adjusted pressed full in to tone wheels. There is also a 24volt version. Access active diagnostic trouble code s using the blink code procedure, the hand-held tester or ServiceRanger software. Back off the slack adjuster to release the brake shoes. Once triggered, differential braking mode remains active regardless of vehicle speed.
Use multimeter to check that valve resistances are correct fig 34. The indicator lamp will remain on until proper sensor output is detected even though the code has been cleared. Relay Valve — Increases the application speed of the service brake. Adjust the rear axle brakes. Refer to the charts beginning on page 19 for a description of these codes. Follow all standard safety procedures, outlined by, but not limited to, the General Precautions listed on page 13 of this document.
Park vehicle on level surface and block wheels. Refer to schematic and correct wiring harness as required. When you hit the washer switch, the pump turns on, the body controller sees ground on this signal and turns on the wipers. Equal length air hose must connect the delivery ports of the relay valve to the brake chambers. Normal Release—Withquick release function, hold diaphragm is vented and there is no pressure at the inlet port. Measure resistance between input voltage and ground at the sensor wiring harness connector. The treadle valve activates the relay valve with an air signal.
No audible air leaks are permitted. Wheel Speed Sensors Reversed on an Axle 102. I would recommend running all new wires because the damaged is most likely along the entire length of the harness down there. Except for special cases, the switch is programmed for momentary operation. Retrieve Diagnostic Trouble Codes 3. The differential braking function is re-enabledafter a cool-downperiod. Crack Pressure — The ascending input pressure or input force to an air valve required to initiate output pressure of flow.
Follow all standard safety procedures, outlined by, but not limited to, the General Precautions listed on page 13 of this document. High values indicate a sensor with an unreliable or non-existentsignal. Wheel speed sensor measurements should read: Location Measurement Sensor 1500 - 2500 Ohms. A magnet is closely coupled to the pole piece and circulates a magnetic field through the coil. It is an assembly of two modulator valves and a quick release valve.
The indicator lamp will remain on until proper sensor output is detected even though the code has been cleared. Pressure modulator resistance should read: Location Measurement Release to Common 4. For more detailed troubleshooting, monitor the wheel speeds and cut-outspeeds with ServiceRanger or a ProLink hand-helddiagnostic tool. Push the speed sensor completely into sensor bushing by hand until it stops against the tone ring. In this case it is necessary to move the vehicle above 5 mph before the indicator lamp will turn off.
Inlet pressure feeds behind release diaphragm to block the exhaust port. Description Diagnostic Port Ground Valve B, Hold Solenoid Diagnostic Port Power 12V Valve B, Common Speed Sensor A, Negative Valve A, Common. They can only be cleared by driving the vehicle. The modulator valves can be operated in either a release or a hold mode to regulate air pressure in the brake chambers. Check the control unit configuration and verify that valves are wired in the proper location for the configuration Refer to Schematic.
Access active trouble code s using either the Blink Code procedure or the hand-heldtester procedure. Blink Location Code Left Steer Axle Sensor Right Steer Axle Sensor Left Drive Axle Sensor Right Drive Axle Sensor Left Additional Axle Sensor Right Additional Axle Sensor 2nd. Use multimeter to check that valve resistances are correct. Sensor Bushing — A bushing which is pressed into steer axles to hold a wheel speed sensor and friction sleeve. Components with stripped threads or damaged parts should be replaced rather than repaired. One relay is used for indicator lamp control. Select Low — The brake pressures level is the same on both wheels of a given axle.