FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Scion >> 2012 >> iQ L4-1.3L (1NR-FE) >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P1604 >> Part 4

Part 4





1NR-FE ENGINE CONTROL: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction

89. PERFORM SIMULATION TEST

(a) Check if the idling 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.

90. CHECK SENSOR INSTALLATION (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 SENSOR
OK -- Continue to next step.

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

(a) Check the harnesses and connectors, referring to DTC P0335 inspection procedure P0335.

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.

92. CHECK 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 IS DEFECTIVE)

93. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / 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

A -- REPAIR OR REPLACE FUEL LINE

94. INSPECT FUEL PUMP

(a) Inspect the fuel pump Inspection.

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

NG -- REPLACE FUEL PUMP Removal

OK -- REPLACE FUEL PRESSURE REGULATOR Disassembly

95. 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 after stopping the engine.

Standard:

147 kPa (1.5 kgf/cm2) or higher (5 minutes after stopping the engine)

HINT
If the engine cannot be started, read the values after cranking the engine.

Result





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

96. READ VALUE USING TECHSTREAM (LONG FT #1)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / Long FT #1.

Result





B -- REPLACE FUEL INJECTOR ASSEMBLY Removal
A -- Continue to next step.

97. PERFORM SIMULATION TEST

(a) Check if the idling 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.

98. CHECK SENSOR INSTALLATION (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 SENSOR
OK -- Continue to next step.

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

(a) Check the harnesses and connectors, referring to DTC P0335 inspection procedure P0335.

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.

100. CHECK 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 IS DEFECTIVE)

101. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP/SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / 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

A -- REPAIR OR REPLACE FUEL LINE

102. INSPECT FUEL PUMP

(a) Inspect the fuel pump Inspection.

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

NG -- REPLACE FUEL PUMP Removal
OK -- Continue to next step.

103. CHECK PURGE VSV

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





Text in Illustration





(b) Start the engine.

(c) Idle the engine.

(d) Disconnect the connector of the purge VSV.

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

OK:

Air does not flow

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.

104. INSPECT FUEL INJECTOR ASSEMBLY

(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 assembly may have a sealing problem.

B -- CHECK INTAKE VALVE

A -- REPLACE FUEL INJECTOR ASSEMBLY Removal

105. 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

106. READ VALUE USING TECHSTREAM (ISC LEARNING VALUE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Data List / ISC Learning Valve.

(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.

107. CHECK CYLINDER COMPRESSION PRESSURE

(a) Check the compression On-Vehicle Inspection.

NG -- CHECK AND REPAIR ENGINE ASSEMBLY

OK -- CHECK VALVE TIMING P0011

108. 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.

109. CHECK SENSOR INSTALLATION (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 SENSOR
OK -- Continue to next step.

110. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT))

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

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

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL SENSOR (FOR INTAKE CAMSHAFT)
OK -- Continue to next step.

111. CHECK SENSOR INSTALLATION (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT))

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

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

OK:

Sensor is installed correctly.

NG -- SECURELY REINSTALL SENSOR (FOR EXHAUST CAMSHAFT)
OK -- Continue to next step.

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

(a) Check the harnesses and connectors, referring to DTC P0335 inspection procedure P0335.

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.

113. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) - ECM)

(a) Check the harnesses and connectors, referring to DTC P0340 inspection procedure P0340.

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.

114. CHECK HARNESS AND CONNECTOR (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) - ECM)

(a) Check the harnesses and connectors, referring to DTC P0365 inspection procedure P0365.

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.

115. 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 (FOR INTAKE CAMSHAFT)

OK -- END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE)

116. CHECK CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT)

(a) Replace the camshaft position sensor (for intake camshaft) Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

OK -- END (CAMSHAFT POSITION SENSOR (FOR INTAKE CAMSHAFT) IS DEFECTIVE)

117. CHECK CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT)

(a) Replace the camshaft position sensor (for exhaust camshaft) Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- REPLACE ECM Removal

OK -- END (CAMSHAFT POSITION SENSOR (FOR EXHAUST CAMSHAFT) IS DEFECTIVE)
pro multis Credits:Operation CHARM About Operation CHARM