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DTC Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC P1572 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
Is applicable DTC detected?
Perform diagnosis of applicable. Refer to DTC Index.
.
 
2.CHECK OVERALL FUNCTION-1
With M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Select “BRAKE SW1” and “BRAKE SW2” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
  3. Check “BRAKE SW1” and “BRAKE SW2” indication as per the following conditions.
    Monitor itemConditionIndication
    BRAKE SW1Brake pedalSlightly depressedOFF
    Fully releasedON
    BRAKE SW2Brake pedalSlightly depressedON
    Fully releasedOFF
 
Without M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector terminals as per the following.
    ECMConditionVoltage
    (Approx.)
    Connector+–
    Terminal
    E16148160Brake pedalSlightly depressed0 V
    Fully releasedBattery voltage
 
Is the inspection result normal?
.
.
 
3.CHECK STOP LIGHT SWITCH POWER SUPPLY CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect stop light switch harness connector.
  3. Check the voltage between stop light switch harness connector and ground.
    +−Voltage
    Stop light switch
    ConnectorTerminal
    E384GroundBattery voltage
Is the inspection result normal?
.
Perform the trouble diagnosis for power supply circuit.
 
4.CHECK STOP LIGHT SWITCH
Check the stop light switch. Refer to Component Inspection.
Is the inspection result normal?
.
Replace stop light switch. Refer to Exploded View.
 
5.CHECK STOP LIGHT SWITCH SIGNAL CIRCUIT
  1. Disconnect ECM harness connector.
  2. Check the continuity between stop light switch harness connector and ECM harness connector.
    +−Continuity
    Stop light switchECM
    ConnectorTerminalConnectorTerminal
    E383E16148Existed
  3. Also check harness for short to ground and to power.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Repair or replace error-detected parts