P31F9

DTC Logic


DTC DETECTION LOGIC

NOTE:
If DTC P31F9 or P31FA is displayed with DTC P0A1D, first perform the trouble diagnosis for DTC P0A1D.
P0A1D.
Without ICC models





With ICC models






DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.

2. 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 RESUME/ACCELERATE switch for at least 10 seconds, then release it and wait at least 10 seconds.
5.Press SET/COAST switch for at least 10 seconds, then release it and wait at least 10 seconds.
6.Check DTC.
Is DTC detected?
YES- Proceed to .
NO- INSPECTION END


Diagnosis Procedure


1. INSPECTION START

Check which type the vehicle is equipped with.
Which type?
Without ICC models-GO TO 2.
With ICC models-GO TO 6.

2. CHECK ASCD STEERING SWITCH CIRCUIT

With CONSULT
1.Turn ignition switch ON.
2.Select "ASCD SET SW", "RESUME/ACC SW", "CANCEL SW" and "MAIN SW" in "DATA MONITOR"
mode of "ENGINE" using CONSULT.
3.Check each item indication as per the following conditions.





Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage between HPCM harness connector terminals as per the following.





Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- GO TO 3.

3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect HPCM harness connector.
3.Disconnect combination switch harness connector.
4.Check the continuity between combination switch and HPCM harness connector.





5.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.

4. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace error-detected parts.

5. CHECK ASCD STEERING SWITCH

.
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- Replace ASCD steering switch. With Heated Steering Wheel.

6. CHECK ICC STEERING SWITCH CIRCUIT

With CONSULT
1.Turn ignition switch ON.
2.Select "ASCD SET SW", "RESUME/ACC SW", "CANCEL SW", "MAIN SW" and "DISTANCE SW" in
"DATA MONITOR" mode of "ENGINE" using CONSULT.
3.Check each item indication as per the following conditions.





Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage between HPCM harness connector terminals as per the following.





Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- GO TO 7.

7. CHECK ICC STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect HPCM harness connector.
3.Disconnect combination switch harness connector.
4.Check the continuity between combination switch and HPCM harness connector.





5.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 8.
NO- Repair or replace error-detected parts.

8. CHECK ICC STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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





2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 9.
NO- Repair or replace error-detected parts.

9. CHECK ICC STEERING SWITCH

.
Is the inspection result normal?
YES- Perform Intermittent Incident.
NO- Replace ICC steering switch. With Heated Steering Wheel.


Component Inspection (ASCD Steering Switch)


1. CHECK ASCD STEERING SWITCH

1.Turn ignition switch OFF.
2.Disconnect combination switch (spiral cable) harness connector.
3.Check resistance between combination switch harness connector terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace ASCD steering switch. With Heated Steering Wheel.


Component Inspection (ICC Steering Switch)


1. CHECK ICC STEERING SWITCH

1.Turn ignition switch OFF.
2.Disconnect combination switch (spiral cable) harness connector.
3.Check resistance between combination switch harness connector terminals as per the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace ICC steering switch. Service and Repair.