ICC (Full Speed Range)

C1A40 SYSTEM SWITCH CIRCUIT





Description

DCA SWITCH
- The DCA system ON/OFF operation is performed by the DCA switch.
- The DCA switch signal is input to the brake booster control unit, and transmitted from the brake booster control unit to the ICC sensor integrated unit via ITS communication.

IBA OFF SWITCH
- The IBA ON/OFF operation is performed by IBA OFF switch.
- The IBA OFF switch signal is input to the brake booster control unit and transmits from the brake booster control unit to the ICC sensor integrated unit via ITS communication.




DTC Logic

DTC DETECTION LOGIC

DTC DETECTION LOGIC:

NOTE:
If DTC "C1A40" is displayed along with DTC "U1000", first diagnose the DTC "U1000". Refer to ICC (Full Speed Range).

DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine and wait for approximately 10 minutes or more.
2. Perform "All DTC Reading" with CONSULT-III.
3. Check if the "C1A40" is detected as the current malfunction in "Self Diagnostic Result" of "ICC".
Is "C1A40" detected as the current malfunction?
YES - Refer to ICC (Full Speed Range).
NO - Refer to Intermittent Incident.




Diagnosis Procedure
1.CHECK SELF-DIAGNOSIS RESULTS
Check if "U1000" is detected other than "C1A40" in "Self Diagnostic Result" of "ICC".
Is "U1000" detected?
YES - Perform the CAN communication system inspection. Repair or replace the malfunctioning parts. Refer to ICC (Full Speed Range).
NO - GO TO 2.
CHECK DATA MONITOR
Check that "DCA ON SW" and "IBA SW" operate normally in "DATA MONITOR" of "ICC".
Is the inspection result normal?
YES - Refer to Intermittent Incident.
NO-1 - When "DCA ON SW" is malfunctioning: GO TO 3
NO-2 - When "IBA SW" is malfunctioning: GO TO 7
3.CHECK DCA SWITCH
1. Turn the ignition switch OFF.
2. Disconnect the DCA switch connector.
3. Check the DCA switch. Refer to ICC (Full Speed Range).
Is the inspection result normal?
YES - GO TO 4.
NO - Replace the DCA switch.
4.CHECK HARNESS BETWEEN BRAKE BOOSTER CONTROL UNIT AND DCA SWITCH
1. Disconnect brake booster control unit connector.
2. Check for continuity between brake booster control unit harness connector and DCA switch harness connector.





3. Check for continuity between brake booster control unit and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - Repair the harnesses or connectors.
5.CHECK DCA SWITCH GROUND CIRCUIT
Check for continuity between DCA switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair the harnesses or connectors.
6.CHECK DCA SWITCH SIGNAL
1. Connect the brake booster control unit connector.
2. Turn the ignition switch ON.
3. Check voltage between brake booster control unit harness connector and ground.





Is the inspection result normal?
YES - Replace the ICC sensor integrated unit. Refer to ICC (Full Speed Range).
NO - Replace the brake booster control unit.
7.CHECK IBA OFF SWITCH
1. Turn the ignition switch OFF.
2. Disconnect the IBA OFF switch connector.
3. Check the IBA OFF switch. Refer to ICC (Full Speed Range).
Is the inspection result normal?
YES - GO TO 8.
NO - Replace the IBA OFF switch.
8.CHECK HARNESS BETWEEN BRAKE BOOSTER CONTROL UNIT AND IBA OFF SWITCH
1. Disconnect brake booster control unit connector.
2. Check for continuity between the brake booster control unit harness connector and IBA OFF switch harness connector.





3. Check for continuity between brake booster control unit and ground.





Is the inspection result normal?
YES - GO TO 9.
NO - Repair the harnesses or connectors.
9.CHECK IBA OFF SWITCH GROUND CIRCUIT
Check for continuity between IBA OFF switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 10.
NO - Repair the harnesses or connectors.
10.CHECK IBA OFF SWITCH SIGNAL
1. Connect the brake booster control unit connector.
2. Turn the ignition switch ON.
3. Check voltage between brake booster control unit harness connector and ground.





Is the inspection result normal?
YES - Replace ICC sensor integrated unit. Refer to ICC (Full Speed Range).
NO - Replace the brake booster control unit.




Component Inspection (DCA Switch)
1.CHECK DCA SWITCH
Check for continuity of DCA switch.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the DCA switch.




Component Inspection (IBA OFF Switch)
1.CHECK IBA OFF SWITCH
Check for continuity of IBA OFF switch.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the IBA OFF switch.




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 ICC (Full Speed Range) ICC (Full Speed Range) 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 ICC (Full Speed Range) for action test.)
2. Check that the ICC system is normal.
- WORK END