Part 4

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction

70. CHECK FUEL INJECTOR FOR PORT INJECTION

(a) Clean the inside of the surge tank with compressed air.

(b) After stopping the engine, measure the HC concentration inside the surge tank for 15 minutes.

Result:

HINT
- If the concentration is 400 ppm or higher, a fuel injector may have a sealing problem.
- *: From step 72, perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

B -- CHECK MALFUNCTION CONDITION

A -- REPLACE FUEL INJECTOR FOR PORT INJECTION Removal

71. 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) When performing the Active Test, check for fuel leakage from the fuel pipes.

Result

HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.
- If there are no fuel leaks, after inspecting the fuel pump control system, check if engine starting trouble occurs again. If engine starting trouble still occurs, proceed to step 72 and perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

B -- CHECK FUEL PUMP CONTROL CIRCUIT Fuel Pump Control Circuit

A -- REPAIR OR REPLACE FUEL LINE

72. CHECK MALFUNCTION CONDITION

(a) If the malfunction could not be identified during the inspections in steps 38, 39, 40 and 47, perform fuel system troubleshooting C (steps 73 to 78).

Result:

(b) If the malfunction could not be identified during the inspection in step 45, perform ignition system troubleshooting (steps 79 to 88).

Result:

(c) If the malfunction could not be identified during the inspections in steps 55, 56 and 57 perform intake air system troubleshooting (steps 89 to 91). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 92 to 99).

Result:

(d) If the malfunction could not be identified during the inspections in steps 58, 59, 60, 61, 64, 65, 67, 68, 69, 70 and 71 perform fuel system troubleshooting A (steps 100 to 107), fuel system troubleshooting B (steps 108 to 110), intake air system troubleshooting (steps 111 to 113), and ignition system troubleshooting (steps 114 to 123), in that order.

Result:

B -- CHECK CRANKSHAFT POSITION SENSOR

C -- READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

D -- CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
A -- Continue to next step.

73. INSPECT FUEL INJECTOR FOR PORT INJECTION

(a) Inspect the fuel injectors for port injection Fuel Injector (for Port Injection).

NG -- REPLACE FUEL INJECTOR FOR PORT INJECTION Removal
OK -- Continue to next step.

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

(a) Disconnect the J1, J2, J3, J4, I1, I2, I3 and I4 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.

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

75. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR FOR PORT INJECTION - ECM)

(a) Disconnect the J1, J2, J3, J4, I1, I2, I3 and I4 fuel injector for port injection connectors.

(b) Disconnect the E2 and E4 ECM connectors.

(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.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

76. CHECK CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- CHECK CAMSHAFT POSITION SENSOR

OK -- END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE)

77. CHECK CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- CHECK VVT SENSOR

OK -- END (CAMSHAFT POSITION SENSOR IS DEFECTIVE)

78. CHECK VVT SENSOR

(a) Replace the VVT sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE ECM Removal

OK -- END (VVT SENSOR IS DEFECTIVE)

79. CHECK CRANKSHAFT POSITION SENSOR

(a) Check the tightening and installation condition of the crankshaft position sensor bolt.

(b) Check the connection of the crankshaft position sensor connector.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL CRANKSHAFT POSITION SENSOR Installation
OK -- Continue to next step.

80. CHECK CAMSHAFT POSITION SENSOR

(a) Check the tightening and installation condition of the camshaft position sensor bolt.

(b) Check the connection of the camshaft position sensor connector.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL CAMSHAFT POSITION SENSOR
OK -- Continue to next step.

81. CHECK VVT SENSOR

(a) Check the tightening and installation condition of the VVT sensor bolt.

(b) Check the connection of the VVT sensor connector.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL VVT SENSOR Installation
OK -- Continue to next step.

82. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

(a) Disconnect the E54 crankshaft position sensor connector.

(b) Disconnect the E1 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 malfunction that do not always occur.
- Make sure there is not an excessive amount of force applied to the wire harness.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

86. CHECK CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- CHECK CAMSHAFT POSITION SENSOR

OK -- END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE)

87. CHECK CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- CHECK VVT SENSOR

OK -- END (CAMSHAFT POSITION SENSOR IS DEFECTIVE)

88. CHECK VVT SENSOR

(a) Replace the VVT sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE ECM Removal

OK -- END (VVT SENSOR IS DEFECTIVE)

89. READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

(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 / Data List / ISC Learning Value.

(e) Start the engine and warm it up until the engine coolant temperature stabilizes with the A/C switch and all the accessory switches off.

Result:

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

90. CHECK CYLINDER COMPRESSION PRESSURE

(a) Inspect the compression On-Vehicle Inspection.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- CHECK VALVE TIMING

91. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

(a) Inspect the engine coolant temperature sensor Testing and Inspection.

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

92. CHECK FUEL PRESSURE

HINT
For the fuel pressure inspection, refer to the following procedures Fuel System.

(a) Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.

Result:

NG -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)
OK -- Continue to next step.

93. READ VALUE USING TECHSTREAM (LONG FT #1 AND LONG FT #2)

(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 / Data List / Long FT #1 and Long FT #2.

Result:

B -- REPLACE FUEL INJECTOR FOR PORT INJECTION
A -- Continue to next step.

94. PERFORM SIMULATION TEST

(a) Check if the idling speed is stable after starting the engine and if an unstable idling speed has ever occurred in the past.

Result:

HINT
Through the customer problem analysis, confirm the fuel being used and the location at which the fuel was added to check if the malfunction is caused by the fuel in the vehicle.

B -- REPLACE FUEL
A -- Continue to next step.

95. CHECK CRANKSHAFT POSITION SENSOR

(a) Check the tightening and installation condition of the crankshaft position sensor bolt.

(b) Check the connection of the crankshaft position sensor connector.

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL CRANKSHAFT POSITION SENSOR
OK -- Continue to next step.

96. CHECK HARNESS AND CONNECTOR (CRANKSHAFT POSITION SENSOR - ECM)

(a) Disconnect the E54 crankshaft position sensor connector.

(b) Disconnect the E1 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):