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DTC C1128:66 [ELECTRONICALLY CONTROLLED BRAKE UNIT]

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Outline

System malfunction location	Electric parking brake switch
Detection condition	•  The electronically controlled brake unit detects that the signal does not stabilize within the specified time even though the electric parking brake switch is operated.
Fail-safe	Refer to “DTC Table” and “Fail-safe Function Malfunction Contents Table”. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
Possible cause	•  Electric parking brake switch connector or terminal malfunction •  Electric parking brake switch malfunction •  Electronically controlled brake unit connector or terminals malfunction •  Short to ground in electric parking brake switch signal circuit •  Short to power supply in electric parking brake switch signal circuit •  Open circuit in electric parking brake switch signal circuit •  Short circuit in electric parking brake switch signal circuits •  Electronically controlled brake unit malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY OPERATION CONDITION BY CUSTOMER •  Ask the customer if they have repeatedly pulled up/pressed down the electric parking brake switch quickly for a short period. •  Has the customer repeatedly pulled up/pressed down the electric parking brake switch quickly for a short period?	Yes	The system is normal. (Explain to the customer that repeatedly pulling up/pressing down the electric parking brake switch quickly for a short period was the cause of the DTC being displayed, and explain how to appropriately operate the switch.)
		No	Go to the next step.
2	INSPECT ELECTRIC PARKING BRAKE SWITCH CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT ELECTRIC PARKING BRAKE SWITCH FOR MALFUNCTION •  Inspect the applicable part. (See ELECTRIC PARKING BRAKE SWITCH INSPECTION.) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See ELECTRIC PARKING BRAKE SWITCH REMOVAL/INSTALLATION.)
4	INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT ELECTRIC PARKING BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	INSPECT ELECTRIC PARKING BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT ELECTRIC PARKING BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT ELECTRIC PARKING BRAKE SWITCH SIGNAL CIRCUITS FOR SHORT CIRCUIT •  Inspect the applicable circuits for short circuit. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Perform the following procedure 3 times or more. ―  Pull up the electric parking brake switch to operate the electric parking brake. ―  Press down the electric parking brake switch to release the electric parking brake. •  Perform the DTC inspection for the electronically controlled brake unit. (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. •  If the malfunction recurs, replace the electronically controlled brake unit, then go to the next step. (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [L.H.D.].) (See ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION [R.H.D.].)
		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED •  Perform the DTC inspection. (See DTC INSPECTION.) •  Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
		No	DTC troubleshooting completed.