DTC Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the voltage between ECM harness connector and ground as per the following conditions.

   +		-	Condition		Voltage (Approx.)
   ECM
   Connector	Terminal
   E77	139	Ground	Brake pedal	Fully released	0 V
   				Slightly depressed	Battery voltage

Is the inspection result normal?

YES

Check intermittent incident. Refer to Intermittent Incident .

NO

Fixed at 0 V: GO TO 2.

NO

Fixed at battery voltage: GO TO 4.

1. Disconnect stop lamp switch harness connector.
2. Check the voltage stop lamp switch harness connector and ground.

   +		-	Voltage
   Stop lamp switch
   Connector	Terminal
   E38	1	Ground	Battery voltage

Is the inspection result normal?

YES

GO TO 3.

NO

Perform the trouble diagnosis for power supply circuit..

1. Check the continuity stop lamp switch harness connector and ECM harness connector.

   Stop lamp switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E38	2	E77	139	Existed

2. Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

GO TO 4.

NO

Repair or replace error-detected parts.

Check stop lamp switch. Refer to Component Inspection .

Is the inspection result normal?

YES

INSPECTION END

NO

Replace stop lamp switch. Refer to Removal and Installation .