With CONSULT - Screen Terms

SYSTEM DESCRIPTION
The EGRC-BPT valve monitors exhaust pressure to activate the diaphragm, controlling throttle body vacuum applied to the EGR valve. In other words, recirculated exhaust gas is controlled in response to positioning of the EGR valve or to engine operation.






ON BOARD DIAGNOSIS LOGIC
If too much EGR flow exists due to an EGRC-BPT valve malfunction, oft idle engine roughness will increase. If the roughness is excessive, then the vacuum to the EGR valve is interrupted through the EGRC-solenoid valve. If the engine roughness is reduced at that time, the EGRC-BPT valve malfunction is indicated.


DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a sate speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch "OFF" and wait at least 5 seconds before conducting the next test.

TESTING CONDITION:
Always perform the test at a temperature of -10°C (14°F) or higher.













With CONSULT
(1) Start engine and warm it up to normal operating temperature.
(2) Stop engine and wait at least 5 seconds.
(3) Turn ignition switch "ON" and select "EGRC-BPT/V P0402" of "EGR SYSTEM" in "DTC WORK SUPPORT" mode with CONSULT.
(4) Start engine and let it idle.
(5) Touch "START".
(6) Check the output voltage of "THRTL POS SEN" (at closed throttle position) and note it.
(7) When the following conditions are met, "TESTING" will be displayed on the CONSULT screen and the bar chart may increase. Maintain the conditions many times until "COMPLETED" appears.

Selector lever: Suitable position
CKPS-RPM (POS): 2,400 - 2,800 rpm (A/T)
2,800 - 3,600 rpm (M/T)
Vehicle speed: 30 - 100 km/h (19 - 62 MPH)
B/FUEL SCHDL: 2.9 - 3.1 ms (A/T)
1.8 - 2.1 ms (M/T)
THRTL POS SEN: (X + 0.14) - (X + 0.30) V (A/T)
(X + 0.13) - (X + 0.48) V (M/T)

X Voltage value measured at step (6)

- The bar chart on CONSULT screen indicates the status of this test. However, the test may be finished before the bar chart becomes full scale.
- If the bar chart indication does not continue to progress, completely release accelerator pedal once and try to meet the conditions again.
- If "TESTING" does not appear on CONSULT screen, retry from step 2).

(8) If "OK" is displayed, carry out "OVERALL FUNCTION CHECK" on next page. If "NG" is displayed, refer to "DIAGNOSTIC PROCEDURE".







DIAGNOSTIC PROCEDURE


COMPONENT INSPECTION






EGRC-BPT valve
1. Plug one of two ports of EGRC-BPT valve.
2. Vacuum from the other port and check leakage without applying any pressure from under EGRC-BPT valve. Leakage should exist.









EGRC-solenoid valve
Check solenoid valve, following the table as shown below:
If NG, replace the solenoid valve.









EGR temperature sensor
Check resistance change and resistance value.
If NG, replace EGR temperature sensor.