B2521

ACTIVE AFS


DTC B2521 ECU CIRC

1.CHECK SENSOR POWER SUPPLY
1. Turn ignition switch ON.





2. Check voltage between AFS control unit harness connector and ground.





OK or NG
OK - GO TO 2.
NG - If voltage is less than approx. 4 V, GO TO 3.
- If voltage is more than approx. 6 V, GO TO 4.
2.CHECK SENSOR SIGNAL





Check voltage between AFS control unit harness connector and ground.





OK or NG
OK - Replace AFS control unit. Service and Repair.
NG - If voltage is less than approx. 0.25 V, GO TO 5.
- If voltage is more than approx. 4.75 V, GO TO 6.
3.CHECK SENSOR POWER SUPPLY CIRCUIT (GROUND SHORT CIRCUIT)
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.





3. Check continuity between AFS control unit harness connector and ground.





OK or NG
OK - Replace AFS control unit. Service and Repair.
NG - GO TO 7.
4.CHECK SENSOR POWER SUPPLY CIRCUIT (IGN POWER SUPPLY SHORT CIRCUIT)
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Turn ignition switch ON.





4. Check voltage between AFS control unit harness connector and ground.





OK or NG
OK - Replace AFS control unit. Service and Repair.
NG - GO TO 8.
5.CHECK SENSOR SIGNAL CIRCUIT (GROUND SHORT CIRCUIT)
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.





3. Check continuity between AFS control unit harness connector and ground.





OK or NG
OK - Replace AFS control unit. Service and Repair.
NG - GO TO 7.
6.CHECK SENSOR SIGNAL CIRCUIT (IGN POWER SUPPLY SHORT CIRCUIT)
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Turn ignition switch ON.





4. Check voltage between AFS control unit harness connector and ground.





OK or NG
OK - Replace AFS control unit. Service and Repair.
NG - GO TO 8.
7.CHECK SENSOR SIGNAL AND POWER SUPPLY CIRCUIT (GROUND SHORT CIRCUIT)
1. Disconnect height sensor connector, front combination lamp LH and RH connector.





2. Check continuity between AFS control unit harness connector and ground.





OK or NG
OK - Replace height sensor, front combination lamp LH or RH with malfunction at the preceding process 3 or 5. Service and Repair or Active AFS.
NG - Repair harness or connector.
8.CHECK SENSOR SIGNAL AND POWER SUPPLY CIRCUIT (IGN POWER SUPPLY SHORT CIRCUIT)
1. Turn ignition switch OFF.
2. Disconnect height sensor connector, front combination lamp LH and RH connector.
3. Turn ignition switch ON.





4. Check voltage between AFS control unit harness connector and ground.





OK or NG
OK - Replace height sensor, front combination lamp LH or RH with malfunction at the preceding process 4 or 6. Service and Repair or Active AFS.
NG - Repair harness or connector.