Nissan Murano: Dtc/circuit Diagnosis / C1197 Vacuum Sensor

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

NOTE:

Confirm if DTC is PAST or CRNT. If DTC is CRNT, proceed with Diagnosis Procedure. If DTC is PAST, clear DTC. Do not replace the ABS actuator and electric unit (control unit) for a PAST DTC.

FAIL-SAFE

Electrical vacuum assistance of brake booster is suspended.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always ignition switch OFF and wait at least 10 seconds before conducting the next test.

GO TO 2.

CHECK DTC DETECTION

CONSULT

1. Ignition switch OFF.

   NOTE:

   Wait at least 10 seconds after ignition switch OFF.

2. Start the engine.

   NOTE:

   Wait at least 10 seconds after start the engine.

3. Perform “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1197” detected?

“CRNT” is displayed: Proceed to DTC Diagnosis Procedure.

“PAST” is displayed: Inspection End (Erase the memory of “Self Diagnostic Result” mode of “ABS”.)

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: Inspection End.

CHECK CONNECTOR

1. Ignition switch OFF.

2. Check the vacuum sensor harness connector for disconnection or looseness.

3. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.

Is the inspection result normal?

GO TO 2.

Repair / replace harness or connector, and GO TO 2.

CHECK BRAKE BOOSTER

1. Ignition switch OFF.

2. Check the brake booster. Refer to Inspection.

Is the inspection result normal?

GO TO 3.

Replace the brake booster. Refer to Removal and Installation.

CHECK VACUUM PIPING

Check the vacuum piping. Refer to Exploded View.

Is the inspection result normal?

GO TO 4.

Replace the vacuum piping. Refer to Removal and Installation.

CHECK TERMINAL

1. Ignition switch OFF.

2. Disconnect vacuum sensor harness connector.

3. Check the vacuum sensor pin terminals for damage or loose connection with harness connector.

4. Disconnect ABS actuator and electric unit (control unit) harness connector.

5. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

GO TO 5.

Repair / replace harness, connector, or terminal.

CHECK VACUUM SENSOR CIRCUIT

1. Ignition switch OFF.

2. Disconnect vacuum sensor harness connector.

3. Disconnect ABS actuator and electric unit (control unit) harness connector.

4. Check the continuity between vacuum sensor harness connector and ABS actuator and electric unit (control unit) harness connector.

   Vacuum sensor		ABS actuator and electric unit (control unit)		Continuity
   Connector	Terminal	Connector	Terminal
   E167	1	E125	12	Yes
   	2		24
   	3		5

5. Check the continuity between vacuum sensor harness connector and ground.

   Vacuum sensor		—	Continuity
   Connector	Terminal
   E167	1	Ground	No
   	2
   	3

Is the inspection result normal?

GO TO 6.

Repair / replace harness or connector.

REPLACE VACUUM SENSOR

CONSULT

1. Connect ABS actuator and electric unit (control unit) harness connector.

2. Replace the vacuum sensor.

   CAUTION:

   Always replace brake booster because vacuum sensor cannot be disassembled. Refer to Removal and Installation.

3. Erase the memory of “Self Diagnostic Result” mode of “ABS”.

4. Ignition switch OFF → ON → OFF.

   NOTE:

   Wait at least 10 seconds after ignition switch OFF or ON.

5. Start engine.

   NOTE:

   Wait at least 10 seconds after start the engine.

6. Select “Self Diagnostic Result” mode of “ABS”.

Is DTC “C1197” detected?

Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation.

Inspection End.