Diagnosis Procedure

IN-VEHICLE SENSOR


In-Vehicle Sensor Diagnosis Procedure

Regarding Wiring Diagram information, Electrical Diagrams.

DIAGNOSTIC PROCEDURE FOR IN-VEHICLE SENSOR





SYMPTOM: In-vehicle sensor circuit is open or shorted. Using the
CONSULT-III, DTC B2578 or B2579 is displayed. Without a CONSULT-III, code 30, 31, 44 or 46 is indicated on A/C auto amp. as a result of conducting self-diagnosis.
1.CHECK IN-VEHICLE SENSOR CIRCUIT
Is self-diagnosis DTC B2578 or B2579 (with CONSULT-III) or code 30, 31 44 or 46 (without CONSULT-III) present?
YES or NO?
YES - GO TO 6.
NO - GO TO 2.
2.CHECK VOLTAGE BETWEEN IN-VEHICLE SENSOR AND GROUND





1. Disconnect in-vehicle sensor connector.
2. Turn ignition switch ON.
3. Check voltage between in-vehicle sensor harness connector
M32 terminal 4 and ground.

4 - Ground : Approx. 5V.

Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 5.
3.CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector M49.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 1 and A/C auto amp. harness connector M49
(A) terminal 26.

1 - 26 : Continuity should exist.

Is the inspection result normal?
YES - GO TO 4.
NO - Repair harness or connector.
4.CHECK IN-VEHICLE SENSOR
Check in-vehicle sensor. Component Inspection.
Is the inspection result normal?
YES - 1. Replace A/C auto amp. Service and Repair.
2. Go to A/C Auto Amp. Self-Diagnosis and perform self-diagnosis.
NO - 1. Replace in-vehicle sensor. In-Vehicle Sensor.
2. Go to A/C Auto Amp. Self-Diagnosis and perform self-diagnosis.
5.CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND A/C AUTO AMP.





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 4 and A/C auto amp. harness connector M50
(A) terminal 32.

4 - 32 : Continuity should exist.

4. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 4 and ground.

4 - Ground Continuity should not exist.

Is the inspection result normal?
YES - 1. Replace A/C auto amp. Service and Repair.
2. Go to A/C Auto Amp. Self-Diagnosis and perform self-diagnosis.
NO - Repair harness or connector.
6.CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR MOTOR AND A/C AUTO AMP. (SELF-DIAGNOSIS CODES 30, 31, 44, 46 OR DTC B2578, B2579)





1. Turn ignition switch OFF.
2. Disconnect A/C auto amp. connector and in-vehicle sensor connector.
3. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 3 and A/C auto amp. harness connector M50
(A) terminal 31.

3 - 31 : Continuity should exist.

4. Check continuity between in-vehicle sensor harness connector
M32 (B) terminal 3 and ground.

2 - Ground : Continuity should exist.
3 - Ground : Continuity should not exist.

Is the inspection result normal?
YES - 1. Replace A/C auto amp. Service and Repair.
2. Go to A/C Auto Amp. Self-Diagnosis and perform self-diagnosis.
NO - Repair harness or connector.