ANTI-LOCK BRAKE SYSTEM (ABS) 5A4-21 EHCU Connector Pin-out Checks Disconnect EHCU. Perform checks with high impedance digital multimeter 5-8840-0285-0 (J-39200) or equivalent. No.
Circuit to be Tested Key Switch Position Multimeter Scale/Range Measure between Pin Nominal Value (24V Battery Vehicle) Note 1 EHCU Power Circuit OFF VDC 3(+)-1(-) 0-0.3V ON VDC 3(+)-1(-) 9.5-16.5V (16.5-34V) OFF VDC 2(+)-1(-) 9.5-16.5V (16.5-34V) OFF VDC 24(+)-1(-) 9.5-16.5V (16.5-34V) 2 EHCU Ground Circuit OFF Ω 1(+)-GND Less than 0.01 Ω OFF Ω 23(+)-GND Less than 0.01 Ω 3 EXHIN Circuit ON VDC 7(+)-1(-) 9.5-16.5V (16.5-34V) Engine Run 4 EXHOUT Circuit ON VDC 8(+)-1(-) 9.5-16.5V (16.5-34V) OFF VDC 8(+)-1(-) 0-0.3V 5 Brake Switch Signal Circuit OFF VDC 16(+)-1(-) 0-0.3V OFF VDC 16(+)-1(-) 9.5-16.5V (16.5-34V) Apply Brake Pedal 6 ABS W/L Circuit ON VDC 6(+)-1(-) 9.5-16.5V (16.5-34V) OFF VDC 6(+)-1(-) 0-0.3V 7 FL Speed Sensor OFF kΩ 10(+)-11(-) 1-2kΩ OFF kΩ 10(+)-1(-) More than 1000kΩ OFF VDC 10(+)-11(-) More than 200mV Turn Wheel at 0.5RPS 8 FR Speed Sensor OFF kΩ 32(+)-33(-) 1-2kΩ OFF kΩ 32(+)-1(-) More than 1000kΩ OFF VDC 32(+)-33(-) More than 200mV Turn Wheel at 0.5RPS