Part 2
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603,P1605: Engine Stall History
P1605 - Rough Idling
Continued
15. READ FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.
Result:
HINT
If the purge VSV is stuck closed, air-fuel ratio compensation for the purge VSV is incorrectly adjusted, and then the air-fuel ratio becomes lean and the engine may stall.
B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)
A -- Continue to next step.
16. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)
(a) Disconnect the purge hose (on the canister side) of the purge VSV.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(d) Start the engine.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine / Active Test / Activate the VSV for Evap Control.
(g) When the purge VSV is operated using the Techstream, check whether the port of the purge VSV applies suction to your finger.
Standard:
Result:
HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- Even if the results are normal, the purge VSV may have been malfunctioning. Continue this inspection procedure until step 22, and if there are no problems with other parts, replace the purge VSV (refer to step 55).
B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)
A -- Continue to next step.
17. INSPECT PURGE VSV
(a) Disconnect the purge VSV connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the purge VSV connector.
NG -- REPLACE PURGE VSV
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (PURGE VSV POWER SOURCE)
(a) Disconnect the purge VSV connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- Make sure there is not an excessive amount of force applied to the wire harness.
(d) Reconnect the purge VSV connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (PURGE VSV - EFI MAIN RELAY)
OK -- Continue to next step.
19. CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)
(a) Disconnect the purge VSV connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Standard Resistance (Check for Short):
HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- Make sure there is not an excessive amount of force applied to the wire harness.
(d) Reconnect the ECM connector.
(e) Reconnect the purge VSV connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM Removal
20. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.
(e) Check whether the fuel pump operating sound occurs when performing the Active Test on the Techstream.
Standard:
Result:
HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- While performing the Active Test, make sure that there is no fuel leakage from the pipes, no signs that fuel has leaked, and no fuel smell.
- If the fuel pump (for low pressure) operating noise is abnormal, proceed to step 21.
B -- CHECK FUEL SYSTEM
A -- Continue to next step.
21. INSPECT FUEL PUMP (FOR LOW PRESSURE)
(a) Disconnect the fuel pump (for low pressure) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Reconnect the fuel pump (for low pressure) connector.
NG -- REPLACE FUEL PUMP (FOR LOW PRESSURE) Removal
OK -- CHECK FUEL PUMP CONTROL SYSTEM
22. CHECK FUEL SYSTEM
(a) Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck.
Result:
HINT
If there is foreign matter such as iron particles on the fuel pump (for low pressure), fuel filter or fuel tank, remove the foreign matter.
B -- REPLACE MALFUNCTIONING PARTS
A -- REPAIR OR REPLACE FUEL SYSTEM
23. READ FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.
Result:
HINT
- Try to operate the vehicle under the conditions recorded in the freeze frame data which were present when the malfunction occurred. Confirm the data at this time and the data when the engine is idling (engine warmed up, no load, and shift lever in P or N) and compare these data with the freeze frame data.
- *1: If the mass air flow meter is malfunctioning and incorrectly measures the intake air volume to be higher than the actual intake air volume of air flowing through the intake manifold, the freeze frame data will show a high Calculate Load value.
- *2: As the air fuel ratio sensor output is low before the sensor warms up, the value at that time cannot be used for diagnosis. If the air fuel ratio sensor is malfunctioning and constantly outputs a value indicating the air-fuel ratio is rich, the actual air-fuel ratio will become lean and the engine may stall.
C -- READ FREEZE FRAME DATA
B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)
A -- Continue to next step.
24. CHECK MASS AIR FLOW METER
(a) Remove the mass air flow meter.
(b) Check for foreign matter in the air flow passage of the mass air flow meter.
Result:
HINT
Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 32, and if there are no problems with other parts, replace the mass air flow meter (refer to step 55).
B -- READ FREEZE FRAME DATA
A -- REPLACE MASS AIR FLOW METER