DTC Description
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the A/F sensors 1. The ECM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too rich.), the ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).
Sensor | Input signal to ECM | ECM function | Actuator |
A/F sensor 1 | Density of oxygen in exhaust gas (Mixture ratio feedback signal) | Fuel injection control | Fuel injector |
DTC No. | CONSULT screen terms (Trouble diagnosis content) | DTC detecting condition |
P0172 | FUEL SYS-RICH-B1 (System too rich bank 1) |
|
POSSIBLE CAUSE
FAIL-SAFE
Traveling control mode (Accelerator angle variation control)
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE-1
Is it difficult to start engine? YES >> GO TO 3.
NO >> GO TO 4.
3.RESTART ENGINE
If it is difficult to start engine, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal.
NOTE: When depressing accelerator pedal three-fourths (3/4) or more, the control system does not start the engine. Do not depress accelerator pedal too much.
Does engine start? YES >> Proceed to EC-266, "Diagnosis Procedure".
NO >> Check exhaust and intake air leak visually.
4.PERFORM DTC CONFIRMATION PROCEDURE-2
Is 1st trip DTC detected? YES >> Proceed to EC-266, "Diagnosis Procedure".
NO >> GO TO 5.
5.PERFORM DTC CONFIRMATION PROCEDURE-3
Hold the accelerator pedal as steady as possible.
CAUTION: Always drive vehicle at a safe speed.
Is 1st trip DTC detected? YES >> Proceed to EC-266, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK EXHAUST GAS LEAK
Is exhaust gas leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 2.
2.CHECK FOR INTAKE AIR LEAK
Intake air leak detected? YES >> Repair or replace error-detected parts.
NO >> GO TO 3.
3.CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT
Is the inspection result normal? YES >> GO TO 4.
NO >> Repair or replace error-detected parts.
4.CHECK FUEL PRESSURE
Check fuel pressure. Refer to EC-144, "Work Procedure".
Is the inspection result normal? YES >> GO TO 6.
NO >> GO TO 5.
5. DETECT MALFUNCTIONING PART
Check fuel hoses and fuel tubes for clogging. Refer to EM-40, "Exploded View".
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.
6.CHECK MASS AIR FLOW SENSOR
With CONSULT
Monitor item | Condition | Value |
MASS AIR FLOW SENSOR (Hz) | Ignition switch ON (Engine stopped.) | Approx. 3500 Hz |
Idle (Engine is warmed-up to normal operating temperature.) | 3500- 4100 Hz | |
2,500 rpm (Engine is warmed-up to normal operating temperature.) | 5000k - 5600 Hz | |
Idle to about 4,000 rpm | 3500 - 4100 Hz to Approx. 6300 Hz* |
*: Check for linear frequency rise in response to engine being increased to about 4,000 rpm.
Without consult
*: Check for linear frequency rise in response to engine being increased to about 4,000 rpm.
Is the measurement value within the specification? YES >> GO TO 7.
NO >> Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. Refer to EC-198, "DTC Description".
7.CHECK FUNCTION OF FUEL INJECTOR
With CONSULT
Without CONSULT
Clicking noise should be heard.
Is the inspection result normal? YES >> GO TO 8.
NO >> Perform trouble diagnosis for “FUEL INJECTOR”, refer to EC-464, "Component Function Check".
8.CHECK FUEL INJECTOR
Keep fuel hose and all fuel injectors connected to fuel tube.
Fuel should be sprayed evenly for each fuel injector.
Is the inspection result normal? YES >> GO TO 9.
NO >> Replace fuel injectors from which fuel does not spray out. Always replace O-ring with new ones. Refer to EM- 40, "Removal and Installation".
9.CHECK INTERMITTENT INCIDENT
Refer to GI-41, "Intermittent Incident".
>> INSPECTION EN
Front wiper drive assembly
Exploded View
REMOVAL
Cowl top
Front wiper drive assembly
Removal and Installation
REMOVAL
Remove cowl top cover. Refer to EXT-25, "Removal and
Installation".
Disconnect harness connector from front wiper motor.
Remove bolts and front wiper driv ...
Preparation
Special Service Tool
The actual shape of the tools may differ from those illustrated here
Tool number
(TechMate No.)
Tool name
Description
—
(J-46534)
Trim Tool Set
Removing trim components
Commercial Service Tools
Tool name
...
Removal and installation
FRONT COMBINATION LAMP
Exploded View
Front fender
Front combination lamp
Clip
Removal and Installation
REMOVAL
Remove front bumper fascia. Refer to EXT-17, "Removal and
Installation".
Remove front combination lamp bolts and clip.
Pull front combinat ...