ICC (Full Speed Range)

C1A22 BCU CIRCUIT

Description

- The brake booster control unit receives the brake fluid pressure command signal from ICC sensor integrated unit via ITS communication and activates the booster solenoid to operate the brake booster.
- The brake booster adjusts the brake fluid pressure by driving the booster solenoid.
- The brake pedal is controlled when the brake booster adjusts the brake fluid pressure.


DTC Logic


DTC DETECTION LOGIC






NOTE:
If DTC "C1A22" is detected along with DTC "U1000", or "C1A05", first diagnose the DTC "U1000", or "C1A05".
- Refer to "DTC Logic" Cruise Control for DTC "U1000".
- Refer to "DTC Logic" ICC (Full Speed Range) for DTC "C1A05".

DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

1.Start the engine.
2.Turn the MAIN switch of ICC system ON.
3.Perform "All DTC Reading" with CONSULT.
4.Check if the "C1A22" is detected as the current malfunction in "Self Diagnostic Result" of "ICC/ADAS".
Is "C1A22" detected as the current malfunction?
YES- Refer to "Diagnosis Procedure" .
NO- Refer to "Intermittent Incident" Intermittent Incident.


Diagnosis Procedure


1. CHECK SELF-DIAGNOSIS RESULTS

Check if "C1A05" or "U1000" is detected other than "C1A22" in "Self Diagnostic Result" of "ICC/ADAS".
Is any DTC detected?
YES- Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to "DTC Index" Testing and Inspection.
NO- GO TO 2.

2. CHECK STOP LAMP SWITCH AND ICC BRAKE SWITCH

Check that "STOP LAMP SW" and "BRAKE SW" operate normally in "DATA MONITOR" of "ICC/ADAS".
Is the inspection result normal?
YES- GO TO 10.
NO-1- When "BRAKE SW" operation is malfunctioning: GO TO 3.
NO-2- When "STOP LAMP SW" operation is malfunctioning: GO TO 5.

3. CHECK ICC BRAKE SWITCH INSTALLATION

1.Turn the ignition switch OFF.
2.Check ICC brake switch for correct installation. Refer to "Inspection and Adjustment" Adjustments.
Is the inspection result normal?
YES- GO TO 4.
NO- Adjust ICC brake switch installation. Refer to "Inspection and Adjustment" Adjustments.

4. ICC BRAKE SWITCH INSPECTION

1.Disconnect ICC brake switch connector.
2.Check ICC brake switch. Refer to "Component Inspection (ICC Brake Switch)" ICC (Full Speed Range).
Is the inspection result normal?
YES- GO TO 7.
NO- Replace the ICC brake switch.

5. CHECK STOP LAMP FOR ILLUMINATION

Check stop lamp illumination.
Is the inspection result normal?
YES- GO TO 6.
NO- Check the stop lamp circuit, and repair or replace the malfunctioning parts.

6. CHECK ICC BRAKE HOLD RELAY

1.Turn the ignition switch OFF.
2.Remove ICC brake hold relay.
3.Check for continuity between ICC brake hold relay terminals.





Is the inspection result normal?
YES- GO TO 7.
NO- Replace ICC brake hold relay.

7. CHECK HARNESS BETWEEN ECM AND ICC BRAKE HOLD RELAY

1.Disconnect ECM connector.
2.Check for continuity between the ECM harness connector and ICC brake hold relay harness connector.





3.Check for continuity between ECM harness connector and ground.





Is the inspection result normal?
YES- GO TO 8.
NO- Repair the harnesses or connectors.

8. CHECK HARNESS BETWEEN ECM AND ICC BRAKE SWITCH

1.Check for continuity between the ECM harness connector and ICC brake switch harness connector.





2.Check for continuity between ECM harness connector and ground.





Is the inspection result normal?
YES- GO TO 9.
NO- Repair the harnesses or connectors.

9. CHECK HARNESS BETWEEN ICC BRAKE SWITCH AND ICC BRAKE HOLD RELAY

1.Disconnect ICC brake switch connector.
2.Check for continuity between ICC brake switch harness connector and ICC brake hold relay harness connector.





3.Check for continuity between ICC brake switch harness connector and ground.





Is the inspection result normal?
YES- GO TO 10.
NO- Repair the harnesses or connectors.

10. PERFORM SELF-DIAGNOSIS OF ECM

1.Connect all connectors again if the connectors are disconnected.
2.Turn the ignition switch ON.
3.Perform "All DTC Reading".
4.Check if any DTC is detected in "Self Diagnostic Result" of "ENGINE".
Is any DTC detected?
YES- Perform diagnosis on the detected DTC and repair or replace the malfunctioning parts. Refer to "DTC Index" Testing and Inspection.
NO- Replace the brake booster control unit.


Special Repair Requirement


DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following operation is performed.
- Removal and installation of ICC sensor integrated unit
- Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT


1. LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to "LASER BEAM AIMING ADJUSTMENT : Description" Description.
- GO TO 2.

2. CHECK ICC SYSTEM

1.Erase the "Self Diagnostic Result", and then perform "All DTC Reading" again after performing the action test. (Refer to "ACTION TEST : Description" Description for action test.)
2.Check that the ICC system is normal.
- WORK END