B2521

B2521 ECU CIRCUIT





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.DTC ERASE
Erase the DTC memory of AFS with CONSULT-III.
- GO TO 2.
2.DTC CONFIRMATION PROCEDURE
1. Turn ignition ON.
2. Select the self-diagnosis with CONSULT-III.
3. Check the self-diagnosis result. Testing and Inspection.
Is DTC "B2521" detected?
YES - SEE Diagnosis Procedure.
NO - Intermittent Incident.




Diagnosis Procedure
1.CHECK EACH SENSOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between AFS control unit harness connector and ground.





Is the measurement value within the standard value?
YES - GO TO 2.
Less than the standard value -GO TO 3.
Higher than the standard value-GO TO 4.
2.CHECK EACH SENSOR SIGNAL
Check voltage between AFS control unit harness connector and ground.





Is the measurement value within the standard value?
YES - Replace AFS control unit. Removal And Installation Xenon Type
Less than the standard value -GO TO 5.
Higher than the standard value-GO TO 6.
3.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harness connector and ground.





Is the inspection result normal?
YES - Replace AFS control unit. Removal And Installation Xenon Type
NO - Repair or replace harness.
4.CHECK EACH SENSOR POWER SUPPLY SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check voltage between AFS control unit harness connector and ground.





Is the inspection result normal?
YES - Replace AFS control unit. Removal And Installation Xenon Type
NO - Repair or replace harness.
5.CHECK EACH SENSOR SIGNAL SHORT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect AFS control unit connector.
3. Check continuity between AFS control unit harness connector and ground.





Is the inspection result normal?
YES - Replace AFS control unit. Removal And Installation Xenon Type
NO - Repair or replace harness.
6.CHECK EACH SENSOR SIGNAL 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.





Is the inspection result normal?
YES - Replace AFS control unit. Removal And Installation Xenon Type
NO - Repair or replace harness.