User manual BENDIX GEN 4 GEN 5 ABS

[. . . ] ® Bendix® Gen 4TM and Gen 5TM ABS for Trucks, Tractors, and Buses Cab-Mounted Models Frame-Mounted Model FIGURE 1 - Bendix® ABS Controller Assemblies GEN 4TM AND GEN 5TM ABS INTRODUCTION This manual describes both the cab mount and the frame mount versions of the Bendix® Gen 4TM and Gen 5TM Antilock Brake System/Automatic Traction Control (ABS/ATC) systems. Both cab and frame mount versions are designed for: · · · · · · · · · · Tractors Trucks Buses and Motor Coaches and RVs. ABS/ATC Operation System Components Service Procedures Diagnosis and Troubleshooting Procedures. Table of Contents ABS Operation . 3 Automatic Traction Control (ATC) System . [. . . ] Time-out or no connection to engine link (J1922/1939). Voltage difference between PMV Power inputs is too high. Retarder control relay shorted high or open circuit. Retarder control relay shorted to ground. Tire size out of range or parameter fault. Brake light switch not pushed at this power cycle. ATC system is disabled for dynamometer test. Sensor memory bit set, (A sensor trouble code has occurred, the ECU must read wheel speeds on all wheels to clear this trouble code. ) ATC Valve. Data Link. ECU. ECU (cont. ). Power Circuits. 24 Speed Sensor Troubleshooting Follow the steps listed below to locate and correct sensor related ABS trouble codes. Access active trouble code(s) using either the Blink Code procedure, with ServiceRanger or the Hand-held Tester procedure. Lookup the code description, the possible causes and the repair procedures provided in this section. Perform the recommended repair procedures. After the repairs are completed, clear all codes and check for any additional codes. If a sensor related trouble code has occurred, a code 17·12 will remain in the system until the vehicle has been driven. TOP - Looking into harness connector 10 7 11 8 4 5 6 1 2 3 13 10 7 14 11 8 4 5 6 1 2 3 7 8 9 4 5 6 1 2 3 4 5 6 1 2 3 16 13 10 7 17 14 11 18 15 8 4 5 6 1 2 3 Fault Codes FIGURE 23 - Typical Wheel Speed Sensor Circuit 12 9 15 12 9 12 9 7 8 9 10 11 12 6 5 4 3 2 1 7 8 9 10 11 12 6 5 4 3 2 1 7 8 9 10 11 12 6 5 4 3 2 1 7 8 9 10 11 12 6 5 4 3 2 1 E D C B A X1 Grey X2 Black X3 Green X4 Brown Harness Connector B (6-Way) PIN 4 5 Circuit Description Speed Sensor (+) Left Steer Speed Sensor (-) Left Steer Speed Sensor (+) Right Steer Speed Sensor (-) Right Steer Speed Sensor (+) Left Rear Speed Sensor (-) Left Rear Speed Sensor (+) Right Rear Speed Sensor (-) Right Rear Speed Sensor (+) Left Rear Rear* Speed Sensor (-) Left Rear Rear* Speed Sensor (+) Right Rear Rear* Speed Sensor (-) Right Rear Rear* Harness Connector X2 (Black) PIN 5 6 7 8 Circuit Description Speed Sensor (-) Right Steer Speed Sensor (+) Right Steer Speed Sensor (-) Left Steer Speed Sensor (+) Left Steer Speed Sensor (-) Left Rear Speed Sensor (+) Left Rear Speed Sensor (-) Right Rear Speed Sensor (+) Right Rear Speed Sensor (-) Left Rear Rear* Speed Sensor (+) Left Rear Rear* Speed Sensor (-) Right Rear Rear* Speed Sensor (+) Right Rear Rear* C (9-Way) 4 5 D (15-Way) 5 6 8 9 X3 (Green) 1 2 3 4 E (12-Way) 6-channel Only 5 6 8 9 X4 (Brown) 6-channel Only 3 4 5 6 *Not Used On Basic System Speed Sensor Resistance Test *Not Used On Basic System The correct resistance for the speed sensor circuit is between 1550 ohms and 2500 ohms. Measure resistance at the wheel location to check the speed sensor. Measure resistance at the appropriate ECU harness connector pins to check the cable and speed sensor. Note: Refer to the chart for pin identification. FIGURE 24 - Wheel Speed Sensor Harness Circuit Descriptions and Resistance Test 25 The 17·12 Sensor Memory Diagnostic Trouble Code The ABS indicator lamp indication and 17·12 diagnostic trouble code are provided to remind the service technician of the need to verify the performance of the ABS wheel speed sensors by driving the vehicle after servicing the sensors. ABS wheel speed sensors do not generate signals unless the wheels are turning. Because of this, certain sensor codes can only be detected when the vehicle is in motion. The trouble code 17·12 is generated after the initial sensor codes are cleared. The trouble codes must be rechecked after clearing the sensor codes in order to see 17·12 reported. A 17·12 trouble code and ABS indicator lamp signal for sensor code cannot be cleared using a ProLink, ServiceRanger software or the diagnostic button. [. . . ] It is generally used for ATC or automatic transmission interface to an engine. J1939 -- A high speed 250, 000 baud data link which is expected to replace J1922. A method of controlling the opposite sides of a steer axle during ABS operation so that torque steer and stopping distance are minimized. Usually control begins at pure select low and moves towards independent control as the cycle progresses. [. . . ]