Part 3

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1603, P1605: Engine Stall History
P1605 - Rough Idling

25. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Start the engine, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.

(d) Idle the engine.

(e) Turn the Techstream on.

(f) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / AFS Voltage B1S1, AFS Voltage B2S1, O2S B1S2 and O2S B2S2.

(g) Read the output voltage from the air fuel ratio sensor when increasing and decreasing the fuel injection volume.

Standard:

Result:

HINT
- The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
- Even if the results are normal, the air fuel ratio sensor may have been malfunctioning. Continue this inspection procedure until step 32, and if there are no problems with other parts, replace the air fuel ratio sensor (refer to step 55).

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

26. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR POWER SOURCE)

(a) Disconnect the air fuel ratio sensor 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 air fuel ratio sensor connector.

NG -- CHECK AIR FUEL RATIO SENSOR POWER SOURCE CIRCUIT P0031
OK -- Continue to next step.

27. CHECK HARNESS AND CONNECTOR (AIR FUEL RATIO SENSOR - ECM)

(a) Disconnect the air fuel ratio sensor 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 air fuel ratio sensor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR FUEL RATIO SENSOR Removal

28. 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
- *1: A long time had elapsed after stopping the engine.
- *2: A long time had not elapsed after stopping the engine.

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

29. 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
This step is not directly related to engine stall.

C -- CLEAR DTC

B -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR
A -- Continue to next step.

30. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

HINT
For the water inlet with thermostat sub-assembly inspection, refer to the following procedures Testing and Inspection.

Result:

HINT
This step is not directly related to engine stall.

B -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR

A -- REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY Removal

31. 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:

B -- CLEAR DTC
A -- Continue to next step.

32. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

HINT
For the engine coolant temperature sensor inspection, refer to the following procedures Testing and Inspection.

Result:

HINT
Even if the results are normal, the engine coolant temperature sensor may have been malfunctioning. If there are no problems with other parts, replace the engine coolant temperature sensor (refer to step 55).

B -- REPLACE MALFUNCTIONING PARTS

A -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal

33. 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 throttle body assembly has a temporary problem in which it cannot fully close, the intake air volume and engine speed increase. As a result, the ISC learning amount becomes less than the standard. At this time, if the throttle body assembly returns to normal and fully closes, the intake air volume will be insufficient and the engine may stall.
- *2: If carbon accumulates on the throttle body assembly and the intake air volume decreases, the ISC learning amount is increased to maintain the idling speed. If this situation continues, the ISC learning amount reaches the upper limit, the idling speed cannot be maintained causing idling to become unstable, and the engine may stall.

C -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT-IE LINEAR)

B -- CHECK THROTTLE BODY ASSEMBLY
A -- Continue to next step.

34. CHECK THROTTLE BODY ASSEMBLY

(a) Check for foreign matter and signs that the throttle body assembly was stuck, and also check that the valve and shaft move smoothly during operation.

Result:

HINT
Even if the results are normal, the throttle body assembly may have been malfunctioning. Continue this inspection procedure until step 40, and if there are no problems with other parts, replace the throttle body assembly (refer to step 55).

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT-IE LINEAR)

A -- CLEAN OR REPLACE THROTTLE BODY ASSEMBLY Removal

36. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT-IE LINEAR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT-iE Linear (Bank 1) or Control the VVT-iE Linear (Bank 2).

(f) Monitor VVT-iE Aim Angle #1 and VVT Change Angle #1 or VVT-iE Aim Angle #2 and VVT Change Angle #2.

(g) Perform the Active Test operation with the engine speed at 1500 rpm.

OK:

HINT
- When viewed from the rear of the engine assembly, bank 1 is on the left side and bank 2 is on the right side.
- Juggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

NG -- CHECK VVT-IE SYSTEM
OK -- Continue to next step.

37. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Start the engine and warm it up.

(e) Enter the following menus: Powertrain / Engine / Active Test / Control the VVT Exhaust Linear (Bank 1) or Control the VVT Exhaust Linear (Bank 2).

(f) Check the engine speed while operating the camshaft timing oil control valve using the Techstream.

OK:

HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- When the results of the inspection using the Active Test are normal but the camshaft timing oil control valve operating noise is abnormal, check the camshaft timing oil control valve for any signs of problems.
- If the camshaft timing oil control valve is stuck on, the valve overlap increases and combustion worsens due to the internal EGR which may cause rough idle or cause the engine to stall.

NG -- REPLACE CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY Removal
OK -- Continue to next step.

38. 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.
- Even if the results are normal, the knock control sensors may have been malfunctioning. If there are no problems with other parts, replace the knock control sensors (refer to step 55).

B -- REPLACE MALFUNCTIONING PARTS
A -- Continue to next step.

39. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

HINT
For the engine coolant temperature inspection, refer to the following procedures Testing and Inspection.

NG -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal
OK -- Continue to next step.

40. INSPECT MASS AIR FLOW METER

(a) Inspect the mass air flow meter On-Vehicle Inspection.

HINT
If the intake air temperature sent to the ECM is higher than the standard due to the mass air flow meter (intake air temperature sensor) malfunctioning, the ignition timing may become delayed.

NG -- REPLACE MASS AIR FLOW METER Removal

OK -- REPLACE KNOCK SENSOR Removal

41. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)

(a) Disconnect the fuel injector for port injection 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.
- A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)

(d) Reconnect the fuel injector for port injection connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY)
OK -- Continue to next step.

42. CHECK HARNESS AND CONNECTOR (IGNITION COIL POWER SOURCE)

(a) Disconnect the ignition coil 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.
- A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)

(d) Reconnect the ignition coil connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL - IG2 RELAY)
OK -- Continue to next step.

43. 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

B -- READ FREEZE FRAME DATA
A -- Continue to next step.

44. READ FREEZE FRAME DATA

(a) Change the location of the ignition coil for the cylinder whose Idle Spark Advn Ctrl (#1 to #8) was 4° or more in step 43.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG).

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Data List / Idle Spark Advn Ctrl (#1 to #8).

Result

HINT
Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

B -- REPLACE IGNITION COIL Removal
A -- Continue to next step.

45. 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:

*: Check not only the ON/OFF state of the air conditioner but also the change in air conditioner load.

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.
- The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
- Even if the results are normal, the A/C system may have been malfunctioning. Continue this inspection procedure until step 47, and if there are no problems with other parts, inspect the A/C system (refer to step 55).

B -- CHECK AIR CONDITIONING SYSTEM
A -- Continue to next step.

46. 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:

*: If the Electrical Load Signal display changes from OFF to ON or the "Electric Load Feedback Val" increases, it probably is a malfunction due to a change in electrical load. Check the generator and the continuity and connections between the generator and ECM.

HINT
- The normal value for the ISC learning amount is engine displacement (liters) x 0.9.
- Even if the results are normal, the electrical load signal system and/or the A/T system may have been malfunctioning. Continue this inspection procedure until step 47, and if there are no problems with other parts, inspect the electrical load system and/or the A/T system (refer to step 55).

C -- READ FREEZE FRAME DATA

B -- CHECK AUTOMATIC TRANSMISSION SYSTEM How to Proceed With Troubleshooting

A -- CHECK GENERATOR CIRCUIT Testing and Inspection

47. 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
Even if the results are normal, the park/neutral position switch and/or A/T system may have been malfunctioning. If there are no problems with other parts, inspect the park/neutral position switch and/or A/T system (refer to step 55).

C -- REPLACE MALFUNCTIONING PARTS

B -- CHECK AUTOMATIC TRANSMISSION SYSTEM How to Proceed With Troubleshooting

A -- INSPECT PARK/NEUTRAL POSITION SWITCH Initial Inspection and Diagnostic Overview

48. 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:

B -- CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)
A -- Continue to next step.

49. 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:

(c) Install the mass air flow meter.

HINT
Even if the results are normal, the mass air flow meter may have been malfunctioning. Continue this inspection procedure until step 54, and if there are no problems with other parts, replace the mass air flow meter (refer to step 55).

B -- CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)

A -- REPLACE MASS AIR FLOW METER Removal

50. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION POWER SOURCE)

(a) Disconnect the fuel injector for port injection connectors.

(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.
- A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)

(d) Reconnect the fuel injector for port injection connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - IG2 RELAY)
OK -- Continue to next step.

51. CHECK HARNESS AND CONNECTOR (IGNITION COIL POWER SOURCE)

(a) Disconnect the ignition coil connectors.

(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.
- A rapid decrease in engine speed may have been caused by a malfunction in all or multiple cylinders. (There may be an electrical malfunction in the wiring shared by all the cylinders.)

(d) Reconnect the ignition coil connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION COIL - IG2 RELAY)
OK -- Continue to next step.

52. 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 (for low pressure) operating sound occurs when performing the Active Test on the Techstream.

Specified Condition:

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 53.

B -- CHECK FUEL SYSTEM
A -- Continue to next step.

53. 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 (FOR LOW PRESSURE) Fuel Pump Control Circuit

54. CHECK FUEL SYSTEM

(a) Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck.

Result:

B -- REPLACE MALFUNCTIONING PARTS

A -- REPAIR OR REPLACE FUEL SYSTEM (FOR LOW PRESSURE)

55. REPLACE MALFUNCTIONING PARTS

(a) If the malfunction could not be identified in steps 3 to 22, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

(b) If the malfunction could not be identified in steps 23 to 32, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

(c) If the malfunction could not be identified in steps 33 to 40, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

(d) If the malfunction could not be identified in steps 41 to 47, inspect and repair the part which is suspected to be malfunctioning according to the step where an inspection was performed.

(e) If the malfunction could not be identified in steps 48 to 54, replace the part which is suspected to be malfunctioning according to the step where an inspection was performed.

HINT
Referring to the chart, inspect and repair or replace the part from the step where an inspection was performed.

NEXT -- Continue to next step.

56. CLEAR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

NEXT -- Continue to next step.

57. PERFORM CONFIRMATION DRIVING PATTERN

(a) Check if engine stall symptoms are present.

HINT
If any engine stall symptoms are present, recheck for DTCs and freeze frame data and perform an inspection.

NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK -- END