Dtc Description

DTC Description

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (ASCD steering switch circuit is open or shorted.)

• ASCD steering switch

• ECM

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

1. CHECK DTC PRIORITY

   If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. PRECONDITIONING

   If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

   1. Turn ignition switch OFF and wait at least 10 seconds.

   2. Turn ignition switch ON.

   3. Turn ignition switch OFF and wait at least 10 seconds.

   >>

   GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

   1. Turn ignition switch ON and wait at least 10 seconds.

   2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

   3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

   4. Press RES + switch for at least 10 seconds, then release it and wait at least 10 seconds.

   5. Press SET − switch for at least 10 seconds, then release it and wait at least 10 seconds.

   6. Check DTC.

   Is DTC detected?

   YES >>

   Proceed to DTC Diagnosis Procedure.

   NO-1 >>

   To check malfunction symptom before repair: Refer to Intermittent Incident.

   NO-2 >>

   Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

1. CHECK DTC PRIORITY

   If DTC P1564 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.

   Is applicable DTC detected?

   YES >>

   Perform diagnosis of applicable. Refer to DTC Description.

   NO >>

   GO TO 2.

2. CHECK ASCD STEERING SWITCH CIRCUIT

   With CONSULT

   1. Turn ignition switch ON.

   2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

   3. Check each item indication as per the following conditions.

      Monitor item	Condition		Indication
      MAIN SW	MAIN switch	Pressed	ON
      		Released	OFF
      CANCEL SW	CANCEL switch	Pressed	ON
      		Released	OFF
      RESUME/ACC SW	RES + switch	Pressed	ON
      		Released	OFF
      SET SW	SET − switch	Pressed	ON
      		Released	OFF

   Without CONSULT

   1. Turn ignition switch ON.

   2. Check the voltage between ECM harness connector terminals.

      ECM			Condition	Voltage (Approx.)
      Connector	+	–
      	Terminal
      E16	144	145	MAIN switch: Pressed	0 V
      			CANCEL switch: Pressed	1.0 V
      			SET − switch: Pressed	2.0 V
      			RES + switch: Pressed	3.0 V
      			All ASCD steering switches: Released	4.0 V

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 3.

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.

      Combination switch (Spiral cable)		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      M30	1	E16	145	Existed

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

   Is the inspection result normal?

   YES >>

   GO TO 4.

   NO >>

   Repair or replace malfunctioning part.

4. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT

   1. Check the continuity between ECM harness connector and combination switch.

      Combination switch (Spiral cable)		ECM		Continuity
      Connector	Terminal	Connector	Terminal
      M30	8	E16	144	Existed

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

   Is the inspection result normal?

   YES >>

   GO TO 5.

   NO >>

   Repair or replace malfunctioning part.

5. CHECK ASCD STEERING SWITCH

   Check ASCD steering switch. Refer to Component Inspection.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   Replace ASCD steering switch. Refer to Removal and Installation.