DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P117A is displayed with other DTC, first perform the trouble diagnosis for the other DTC. Refer to EC-94, "DTC Index".
DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting condition | Possible cause |
P117A | AIR FUEL RATIO B1 (AIR FUEL RATIO B1) | ECM detects a lean/rich air fuel ratio state in any cylinder for a specified length of time. |
|
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING-1
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
NOTE:
Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.
>> GO TO 2.
2.PRECONDITIONING-2
Will CONSULT be used? YES >> GO TO 3.
NO >> GO TO 6.
3.PERFORM DTC CONFIRMATION PROCEDURE-1
>> GO TO 4.
4.PERFORM DTC CONFIRMATION PROCEDURE-2
With CONSULT
CAUTION:
NOTE:
Is “CMPLT” displayed? YES >> GO TO 5.
NO >> GO TO 2.
5.PERFORM DTC CONFIRMATION PROCEDURE-3
Check 1st trip DTC.
Is 1st trip DTC detected? YES >> Proceed to EC-364, "Diagnosis Procedure".
NO >> INSPECTION END
6.PERFORM DTC CONFIRMATION PROCEDURE-4
Without
CONSULT
CAUTION:
NOTE:
Is 1st trip DTC detected? YES >> Proceed to EC-364, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK FOR INTAKE AIR LEAK
Is the inspection result normal? YES >> GO TO 2.
NO >> Repair or replace error-detected parts.
2.CHECK EXHAUST GAS LEAK
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace error-detected parts.
3.CHECK FUEL PRESSURE
Is the inspection result normal? YES >> GO TO 4.
NO >> GO TO 9.
4.CHECK MASS AIR FLOW SENSOR
With CONSULT
Check “MASS AIR FLOW” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
For specification, refer to EC-486, "Mass Air Flow Sensor".
With GST
Check mass air flow sensor signal in Service $01 using GST.
For specification, refer to EC-486, "Mass Air Flow Sensor".
Is the inspection result normal? YES >> GO TO 5.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to EC-187, "Diagnosis Procedure".
5.CHECK FUNCTION OF FUEL INJECTOR-1
With CONSULT
Without
CONSULT
Clicking noise should be heard.
Is the inspection result normal? YES >> GO TO 6.
NO >> Perform trouble diagnosis for fuel injector, refer to EC- 450, "Component Function Check".
6.CHECK FUNCTION OF FUEL INJECTOR-2
CAUTION:
Perform the following procedure in a place with no combustible objects and good ventilation.
Keep fuel hose and all fuel injectors connected to fuel tube.
Fuel should be sprayed evenly for each fuel injector.
Fuel must not drip from the tip of fuel injector.
Is the inspection result normal? YES >> GO TO 7.
NO >> Replace fuel injector. Refer to EM-40, "Removal and Installation".
7.CHECK FUNCTION OF IGNITION COIL-1
CAUTION:
Perform the following steps in a well-ventilated area with no combustibles.
NOTE:
CONSULT must not be used to release fuel pressure. It develops again during the following steps, if released by using CONSULT.
Spark should be generated.
CAUTION:
NOTE:
When the gap is less than 13 mm (0.52 in), a the spark might be generated even if the coil is malfunctioning.
Is the inspection result normal? YES >> GO TO 8.
NO >> GO TO 10.
8.CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to EM-23, "Inspection".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".
NO >> Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
9.DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging.
Is the inspection result normal? YES >> Replace fuel filter and fuel pump assembly. Refer to FL-6, "Removal and Installation".
NO >> Repair or replace error-detected parts.
10.CHECK FUNCTION OF IGNITION COIL-2
Spark should be generated.
Is the inspection result normal? YES >> GO TO 11.
NO >> Check ignition coil, power transistor and their circuits. Refer to EC-456, "Component Function Check".
11.CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.
Is the inspection result normal? YES >> 1. Repair or clean spark plug. Refer to EM-45, "Removal and Installation".
2. GO TO 12.
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-118, "Spark Plug".
12.CHECK FUNCTION OF IGNITION COIL-3
Spark should be generated
Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".
NO >> Replace spark plug(s) with standard type one(s). For spark plug type, refer to EM-118, "Spark Plug".
Precaution for work
When removing or disassembling each component, be careful not to damage
or deform it. If a component
may be subject to interference, be sure to protect it with a shop cloth.
When removing (disengaging) components with a screwdriver or similar
tool, be sure to wrap the component
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