Part 5

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

90. CHECK CYLINDER COMPRESSION PRESSURE

(a) Inspect the compression Engine.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- CHECK VALVE TIMING P0016

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 procedure 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 Removal
A -- Continue to next step.

94. PERFORM SIMULATION TEST

(a) Check if the idle speed after starting the engine is currently stable and has always been stable 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 Components
OK -- Continue to next step.

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

(a) Disconnect the crankshaft position 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 crankshaft position sensor connector.

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

97. REPLACE CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE ECM Removal

OK -- END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

98. 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.
- When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
- Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.

B -- INSPECT FUEL PUMP (FOR LOW PRESSURE)

A -- REPAIR OR REPLACE FUEL LINE

99. 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:

HINT
- Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck.
- Make sure the internal connector is securely connected.
- Make sure the fuel pump filter is not clogged.

(c) Reconnect the fuel pump (for low pressure) connector.

NG -- REPLACE FUEL PUMP (FOR LOW PRESSURE) Removal

OK -- REPLACE PRESSURE REGULATOR Removal

100. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)

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

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

Result:

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

101. 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 Removal
A -- Continue to next step.

102. PERFORM SIMULATION TEST

(a) Check if the idle speed after starting the engine is currently stable and has always been stable 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.

103. 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 Components
OK -- Continue to next step.

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

(a) Disconnect the crankshaft position 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 crankshaft position sensor connector.

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

105. REPLACE CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE ECM Removal

OK -- END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

106. 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.
- When performing the Active Test, if there is no operating noise from the fuel pump, the fuel pump system may be malfunctioning.
- Check if the vehicle ran out of fuel, as engine starting trouble due to running out of fuel is also detected.

B -- INSPECT FUEL PUMP (FOR LOW PRESSURE)

A -- REPAIR OR REPLACE FUEL LINE

107. 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:

HINT
- Make sure there is no foreign matter such as iron particles on the fuel pump (for low pressure) and no signs that the fuel pump (for low pressure) was stuck.
- Make sure the internal connector is securely connected.
- Make sure the fuel pump filter is not clogged.

(c) Reconnect the fuel pump (for low pressure) connector.

NG -- REPLACE FUEL PUMP (FOR LOW PRESSURE) Removal
OK -- Continue to next step.

108. CHECK PURGE VSV

(a) Disconnect the vacuum hose (on the canister side) of the purge VSV.

(b) Start the engine.

(c) Idle the engine.

(d) Disconnect the purge VSV connector.

(e) Check if air flows through the purge VSV.

Standard:

Air does not flow.

(f) Reconnect the purge VSV connector.

(g) Reconnect the vacuum hose.

HINT
When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs Reading and Clearing Diagnostic Trouble Codes.

NG -- INSPECT PURGE VSV Testing and Inspection
OK -- Continue to next step.

109. 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.

B -- CHECK INTAKE VALVE

A -- REPLACE FUEL INJECTOR FOR PORT INJECTION Removal

110. CHECK INTAKE VALVE

(a) Check if carbon is on the intake valves.

Result:

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

A -- CLEAN INTAKE VALVE

111. 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, turn off all accessory switches and warm up the engine until the engine coolant temperature stabilizes.

Result:

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

112. CHECK CYLINDER COMPRESSION PRESSURE

(a) Inspect the compression Engine.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- ADJUST VALVE TIMING Variable Valve Timing

113. 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.

114. 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 Components
OK -- Continue to next step.

115. 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 Components
OK -- Continue to next step.

116. 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 Components
OK -- Continue to next step.

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

(a) Disconnect the crankshaft position 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 malfunction 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 VVT sensor for exhaust side connector.

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

121. REPLACE CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE CAMSHAFT POSITION SENSOR

OK -- END (CRANKSHAFT POSITION SENSOR WAS DEFECTIVE)

122. REPLACE CAMSHAFT POSITION SENSOR

(a) Replace the camshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE VVT SENSOR

OK -- END (CAMSHAFT POSITION SENSOR WAS DEFECTIVE)

123. REPLACE 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 WAS DEFECTIVE)