DTC Description
DTC DETECTION LOGIC
The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2.
A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase.
When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed.
DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting conditio |
P0420 | TW CATALYST SYS-B1 (Catalyst system efficiency below threshold bank 1) |
|
POSSIBLE CAUSE
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
Will CONSULT be used? YES >> GO TO 2.
NO >> GO TO 6.
2.PERFORM DTC CONFIRMATION PROCEDURE-1
With CONSULT
TESTING CONDITION: Do not hold engine speed for more than the specified minutes below.
Which is displayed on CONSULT screen? CMPLT>> GO TO 5.
INCMP >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE-2
Does the indication change to “CMPLT”?
YES >> GO TO 5.
NO >> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
>> GO TO 2.
5.PERFORM DTC CONFIRMATION PROCEDURE-3
Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Proceed to EC-302, "Diagnosis Procedure".
NO >> INSPECTION END
6.PERFORM COMPONENT FUNCTION CHECK
Without CONSULT
Is the inspection result normal? YES >> INSPECTION END
NO >> Proceed to EC-302, "Diagnosis Procedure".
Diagnosis Procedure
1.CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dent.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK EXHAUST GAS LEAK
Is exhaust gas leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 3.
3.CHECK INTAKE AIR LEAK
Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 4.
4.CHECK IGNITION TIMING AND IDLE SPEED
Check the following items. Refer to EC-132, "Work Procedure".
For specification, refer to EC-500, "Ignition Timing" For specification, refer to EC-500, "Idle Speed".
Is the inspection result normal? YES >> GO TO 5.
NO >> Follow the EC-132, "Work Procedure".
5.CHECK FUEL INJECTOR
Check the fuel injector. Refer to EC-464, "Component Function Check".
Is the inspection result normal? YES >> GO TO 6.
NO >> Perform EC-464, "Diagnosis Procedure".
6.CHECK FUNCTION OF IGNITION COIL-1
CAUTION: Do the following procedure in the place where ventilation is good without the combustible.
NOTE: Do not use CONSULT to release fuel pressure, or fuel pressure applies again during the following procedure.
Spark should be generated.
CAUTION:
NOTE: When the gap is less than 13 mm (0.52 in), the spark might be generated even if the coil is malfunctioning.
Is the inspection result normal? YES >> GO TO 10.
NO >> GO TO 7.
7.CHECK FUNCTION OF IGNITION COIL-2
Spark should be generated.
Is the inspection result normal? YES >> GO TO 8.
NO >> Check ignition coil, power transistor and their circuits. Refer to EC-470, "Diagnosis Procedure".
8.CHECK SPARK PLUG
Check the initial spark plug for fouling, etc. Refer to EM-17, "Removal and Installation".
Is the inspection result normal? YES >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-115, "General Specification".
NO >> Repair or clean spark plug. Refer to EM-17, "Removal and Installation". Then GO TO 9
9.CHECK FUNCTION OF IGNITION COIL-3
Spark should be generated.
Is the inspection result normal? YES >> INSPECTION END
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-115, "General Specification".
10.CHECK FUEL INJECTOR
Refer to EM-40, "Exploded View".
Keep fuel hose and all fuel injectors connected to fuel tube.
Does fuel drip from fuel injector? YES >> GO TO 11.
NO >> Replace the fuel injector(s) from which fuel is dripping. Refer to EM-40, "Exploded View".
11.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
Is the trouble fixed? YES >> INSPECTION END
NO >> Replace three way catalyst assembly. Refer to EM-29, "Exploded View".
Wind deflector
Removal and Installation
REMOVAL
Remove headlining Refer to INT-30, "Removal and Installation".
Open the glass lid to view the wind deflector.
Use suitable tool (A) release pawl on LH/RH side of wind deflector.
: Pawl
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