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 A/F sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed.
DTC CONFIRMATION PROCEDURE 1.Inspection START
Will CONSULT-III be used?
Will CONSULT-III be used?
YES >> GO TO 2.
NO >> GO TO 7. 2.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION:
Do not maintain engine speed for more than the specified minutes below.
>> GO TO 3. 3.PERFORM DTC CONFIRMATION PROCEDURE-I With CONSULT-III
Turn ignition switch ON and select "DATA MONITOR" mode with CONSULT-III.
Start engine and warm it up to the normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
Let engine idle for 1 minute.
Check that "COOLAN TEMP/S" indicates more than 70°C (158°F) . If not, warm up engine and go to next step when "COOLAN TEMP/S" indication reaches 70°C (158°F) .
Open engine hood.
Select "DTC and SRT CONFIRMATION" then "SRT WORK SUPPORT" mode with CONSULT-III.
Rev engine between 2,000 and 3,000 rpm and hold it for 3 consecutive minutes then release the accelerator pedal completely.
Check the indication of "CATALYST". Which is displayed on CONSULT-III screen?
CMPLT >> GO TO 6.
INCMP >> GO TO 4. 4.PERFORM DTC CONFIRMATION PROCEDURE-II
Wait 5 seconds at idle.
Rev engine between 2,000 and 3,000 rpm and maintain it until "INCMP" of "CATALYST" changes to "CMPLT" (It will take approximately 5 minutes). Does the indication change to "CMPLT"?
YES >> GO TO 6.
NO >> GO TO 5. 5.PERFORM DTC CONFIRMATION PROCEDURE AGAIN
Stop engine and cool it down to less than 70°C (158°F) .
Perform DTC CONFIRMATION PROCEDURE again. >> GO TO 3.
6.PERFORM DTC CONFIRMATION PROCEDURE-III
Check 1st trip DTC.
Is 1st trip DTC detected?
YES >> Go to Diagnosis Procedure.
NO >> Inspection END 7.PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to Component Function Check.
NOTE:
Use component function check to check the overall function of the three way catalyst (manifold). During this check, a 1st trip DTC might not be confirmed.
Is the Inspection result normal?
YES >> Inspection END
NO >> Go to Diagnosis Procedure.
Component Function Check 1.PERFORM COMPONENT FUNCTION CHECK Without CONSULT-III
Start engine and warm it up to the normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON.
Turn ignition switch OFF and wait at least 10 seconds.
Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
Let engine idle for 1 minute.
Open engine hood.
Check the voltage between ECM harness connector terminals under the following conditions.
Is the Inspection result normal?
YES >> Inspection END
NO >> Go to Diagnosis Procedure.
Diagnosis Procedure 1.CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dents.
Is the Inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace malfunctioning part. 2.CHECK EXHAUST GAS LEAKAGE
Start engine and run it at idle.
Listen for an exhaust gas leakage before the three way catalyst (manifold).
CAUTION: Perform the following procedure in a place with no combustible objects and good ventilation.
Turn ignition switch OFF.
Remove fuel pump fuse in IPDM E/R to release fuel pressure.
NOTE:
Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following procedure.
Start engine.
After engine stalls, crank it 2 or 3 times to release all fuel pressure.
Turn ignition switch OFF.
Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
Remove ignition coil and spark plug of the cylinder to be checked.
Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
Connect spark plug and harness connector to ignition coil.
Fix ignition coil using a rope etc. with gap of 13 - 17 mm (0.52 -0.66 in) between the edge of the spark plug and grounded metal portion as shown in the figure.
Crank engine for approximately 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.
Spark should be generated.
CAUTION:
Never place the spark plug and the ignition coil within 50 cm (19.7 in) each other. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.
It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.
NOTE: When the gap is less than 13 mm (0.52 in), a 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-II
Turn ignition switch OFF.
Disconnect spark plug and connect a non-malfunctioning spark plug.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.
Check the initial spark plug for fouling, etc.
Is the Inspection result normal?
YES >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to See: Engine, Cooling and Exhaust\Engine\Spark Plug\Service and Repair.
NO >> Repair or clean spark plug. Then GO TO 9. 9.CHECK FUNCTION OF IGNITION COIL-III
Reconnect the initial spark plugs.
Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded portion.