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DTC Diagnosis Procedure
1.CHECK DTC PRIORITY
If DTC P1564 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 ASCD STEERING SWITCH CIRCUIT
With M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Select “CANCEL SW”, “RES+ SW” and “SET- SW” in “DATA MONITOR” mode of “ENGINE” using M.U.T.-III SE.
  3. Check each item indication as per the following conditions.
    Monitor itemConditionIndication
    MAIN SWMAIN switchPressedON
    ReleasedOFF
    CANCEL SWCANCEL switchPressedON
    ReleasedOFF
    RESUME/ACC SWRES+ switchPressedON
    ReleasedOFF
    SET SWSET- switchPressedON
    ReleasedOFF
 
Without M.U.T.-III SE
  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector terminals.
    ECMConditionVoltage
    (Approx.)
    Connector+-
    Terminal
    E16142143MAIN switch: Pressed0 V
    CANCEL switch: Pressed1 V
    SET- switch: Pressed2 V
    RES+ switch: Pressed3 V
    All ASCD steering switches: Released4 V
 
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
.
 
3.CHECK ASCD STEERING SWITCH GROUND CIRCUIT
  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Disconnect combination switch (spiral cable) harness connector.
  4. Check the continuity between combination switch (spiral cable) and ECM harness connector.
    +−Continuity
    Combination switch
    (Spiral cable)
    		ECM
    ConnectorTerminalConnectorTerminal
    M301E16143Existed
  5. Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
4.CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT
  1. Check the continuity between ECM harness connector and combination switch.
    +−Continuity
    Combination switch
    (Spiral cable)
    		ECM
    ConnectorTerminalConnectorTerminal
    M308E16142Existed
  2. Also check harness for short to ground and to power.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
5.CHECK ASCD STEERING SWITCH
Refer to Component Inspection.
Is the inspection result normal?
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Replace ASCD steering switch. Refer to Component Parts Location.