Description
The power generation voltage variable control enables fuel consumption to be decreased by reducing the engine load which is caused by the power generation of the generator. The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the charging/discharging current of the battery.
Based on the sensor signal, ECM judges whether or not the power generation voltage variable control is performed. When performing the power generation voltage variable control, ECM calculates the target power generation voltage based on the sensor signal. And ECM sends the calculated value as the power generation command value to IPDM E/R. For the details of the power generation voltage variable control, refer to CHG-8, "System Description". CAUTION: Never connect the electrical component or the ground wire directly to the battery terminal. The connection causes the malfunction of the power generation voltage variable control, and then the battery discharge may occur.
DTC Logic
DTC DETECTION LOGIC
NOTE: If DTC P1550 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC-394, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next test.
TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.
2.PERFORM DTC CONFIRMATION PROCEDURE
Diagnosis Procedure
1.CHECK GROUND CONNECTION
2.CHECK BATTERY CURRENT SENSOR POWER SUPPLY CIRCUIT
3.CHECK BATTERY CURRENT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
4.CHECK BATTERY CURRENT SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
5.CHECK BATTERY CURRENT SENSOR
6.CHECK INTERMITTENT INCIDENT
Component Inspection
1.CHECK BATTERY CURRENT SENSOR
: Vehicle front
: To body ground
Before measuring the terminal voltage, confirm that the battery is fully charged.
Refer to PG-2, "How to Handle Battery".
Electrical units location
Electrical Units Location
ENGINE COMPARTMENT
PASSENGER COMPARTMENT
LUGGAGE COMPARTMENT
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P0451 evap control system pressure sensor
Description
The EVAP control system pressure sensor detects pressure in the
purge line. The sensor output voltage to the ECM increases as pressure
increases
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
NOTE:
Never remove fuel filler cap during DTC confirmation procedur ...
Vacuum lines
Inspection
VISUAL INSPECTION
Check for improper assembly, damage and deterioration. Replace as necessary.
CHECK VALVE INSPECTION
Airtightness Inspection
Use a suitable tool to check the built-in check valve. Replace the
vacuum hose with the built-in check valve as an assembly if the vacuu ...