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Home >> Toyota Truck >> 2008 >> Highlander 4WD V6-3.3L (3MZ-FE) Hybrid >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P2420 >> Part 2

Part 2








3MZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2420: Evaporative Emission System Switching Valve Control Circuit High - (Continued)

45. PERFORM ACTIVE TEST USING TECHSTREAM (PURGE VSV)





(a) Disconnect the hose (to canister) from the purge VSV.
(b) Start the engine.
(c) Enter the following menus on Techstream: Powertrain / Engine and ECT / Active Test / Active the VSV for EVAP Control.
(d) Turn the purge VSV OFF.
(e) Use your finger and confirm that the purge VSV has no suction.
(f) Turn the purge VSV ON.
(g) Use your finger and confirm that the purge VSV has suction.
OK:
Purge VSV functions normally
Result:






B -- CHECK HOSES (PURGE VSV - CANISTER)
A -- Continue to next step.
46. CHECK PURGE VSV





(a) Remove the purge VSV.
(b) Apply compressed air to the purge VSV, and confirm that no air flows from A to B as shown in the illustration.
(c) Apply battery voltage to the purge VSV.
(d) While applying compressed air, confirm that air flows from A to B as shown in the illustration.
Result:






NG -- REPLACE PURGE VSV
OK -- Continue to next step.
47. CHECK HARNESS AND CONNECTOR (PURGE VSV - EFI NO. 3 FUSE)





(a) Disconnect the purge VSV connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage between terminal 1 of the B29 connector and body ground.
Result:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
48. CHECK HARNESS AND CONNECTOR (PURGE VSV - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the hybrid vehicle control ECU connector and the B29 purge VSV connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
49. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)

50. CHECK CANISTER PUMP MODULE (VACUUM PUMP POWER SOURCE CIRCUIT)





(a) Turn the power switch off.
(b) Remove the canister lower cover.
(c) Disconnect the canister pump module connector.
(d) Connect the Techstream to the DLC3.
(e) Turn the power switch on (IG).
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
(g) Turn the vacuum pump on using the tester.
(h) Measure the voltage between terminals 1 and 6 of the O42 connector.
Standard voltage:
10 to 14 V
Result:






B -- CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)
A -- Continue to next step.
51. CHECK HARNESS AND CONNECTOR (VACUUM PUMP - BODY GROUND)





(a) Turn the power switch off.
(b) Measure the resistance between terminal O42-6 and body ground.
Standard resistance:
Below 10 Ohms
NG -- REPAIR OR REPLACE VACUUM HOSE (PURGE VSV - THROTTLE BODY)
OK -- Continue to next step.
52. CHECK HARNESS AND CONNECTOR (VACUUM PUMP - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
53. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
54. CHECK CANISTER PUMP MODULE (VENT VALVE POWER SOURCE CIRCUIT)





(a) Turn the power switch off.
(b) Remove the canister lower cover.
(c) Disconnect the canister connector.
(d) Connect the Techstream to the DLC3.
(e) Turn the Power switch on (IG).
(f) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Vacuum Pump.
(g) Turn the vacuum pump on using the tester.
(h) Measure the voltage between terminals 8 and 9 of the O42 connector and body ground.
Standard voltage:
10 to 14 V
Result:






B -- REPLACE CHARCOAL CANISTER ASSEMBLY
A -- Continue to next step.
55. CHECK HARNESS AND CONNECTOR (VENT VALVE - BODY GROUND)





(a) Turn the power switch off.
(b) Measure the resistance between terminal O42-9 and body ground.
Standard resistance:
Below 10 Ohms
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.


56. CHECK HARNESS AND CONNECTOR (VENT VALVE - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
57. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Components.
NEXT -- Continue to next step.
58. CHECK HOSES (PURGE VSV - CANISTER)
(a) Remove the canister cover.





(b) Connect the pressure gauge (SST) to the canister pump module with the adapter.
(c) Pressurize the EVAP system to between 3.2 and 3.7 kPa (24 to 28 mmHg).
NOTE: More than 4.7 kPa (35 mmHg) of pressure will damage the EVAP system. Pay attention to the pressure.
(d) Apply soapy water to the piping and connecting parts of the EVAP system. Look for the area where bubbles appear.
HINT:
- If the system has leaks, a whistling sound will be heard.
- Disconnect the hose between the canister and fuel tank from the canister. Close the canister on the area where the hose was connected and perform an inspection. The fuel tank can be eliminated from the suspected areas for leak checks.

NEXT -- Continue to next step.
59. REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)

60. CHECK FUEL VAPOR-CONTAINMENT VALVE ASSEMBLY (POWER SOURCE CIRCUIT)





(a) Turn the power switch off.
(b) Disconnect the Ok1 connector.
(c) Connect the Techstream to the DLC3.
(d) Turn the power switch on (IG).
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Fuel Vapor-Containment Valve.
(f) Turn the fuel vapor-containment valve ON using the tester.
(g) Measure the voltage between terminals 3 and 7 of the Ok1 connector.
Standard voltage:
10 to 14 V
Result:






B -- CHECK HARNESS AND CONNECTOR (TANK WIRE HARNESS)
A -- Continue to next step.
61. CHECK HARNESS AND CONNECTOR (TANK CLOSE VALVE - IGCT NO. 4 FUSE)





(a) Turn the power switch on (IG).
(b) Measure the voltage between terminal Ok1-3 and body ground.
Standard voltage:
10 to 14 V
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
62. CHECK HARNESS AND CONNECTOR (TANK CLOSE VALVE - HYBRID VEHICLE CONTROL ECU)





(a) Disconnect the hybrid vehicle control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(c) Connect the hybrid vehicle control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
63. REPLACE HYBRID VEHICLE CONTROL ECU
(a) Replace the hybrid vehicle control ECU Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
64. REPLACE PURGE VSV
(a) Replace the purge VSV Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
65. REPLACE CHARCOAL CANISTER ASSEMBLY
(a) Replace the canister assembly Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
66. CHECK HARNESS AND CONNECTOR (TANK WIRE HARNESS)
(a) Remove the fuel tank assembly. Removal





(b) Disconnect the fuel vapor-containment valve connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





(d) Reinstall fuel tank assembly. Installation

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
67. REPLACE FUEL VAPOR-CONTAINMENT VALVE
(a) Replace the Fuel vapor- containment Valve Components.
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
68. REPAIR OR REPLACE HARNESS OR CONNECTOR
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)
69. REPAIR OR REPLACE VACUUM HOSE (PURGE VSV - THROTTLE BODY)
NEXT -- PERFORM EVAP SYSTEM CHECK AGAIN (AUTOMATIC MODE)

MONITOR DESCRIPTION

Vent valve stuck open (vent)
In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to conduct an EVAP leak check. If the pressure does not increase when the vent valve is opened, the ECM interprets this as the vent valve being stuck open. The ECM illuminates the MIL and sets the DTC.





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





Example of restart time





Key-off monitor sequence 1 to 15

1. Atmospheric pressure measurement





2. First reference pressure measurement





3. Vent valve stuck closed check





4. Vacuum introduction for canister





5. Purge VSV stuck closed check





6. Second reference pressure measurement





7. Canister leak





8. Fuel vapor-containment valve (FVCV stuck closed check)





9. Vacuum introduction for fuel tank





10. FVCV stuck closed check





11. FTP sensor stuck check





12 Third reference pressure measurement





13. Fuel tank leak check





14. FTP sensor stuck check





15. Atmospheric pressure measurement





TYPICAL MALFUNCTION THRESHOLDS

"Saturated" indicates that the EVAP pressure change is less than 0.286 kPa (2.14 mmHg) in 60 seconds.

Vent valve stuck open (vent)





MONITOR RESULT

Refer to CHECKING MONITOR STATUS Component Tests and General Diagnostics.
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