Part 4

1GR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction - (Continued)

101. 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.

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

102. INSPECT 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)

103. 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 ASSEMBLY

A -- REPAIR OR REPLACE FUEL LINE

104. INSPECT FUEL PUMP ASSEMBLY

(a) Disconnect the fuel pump connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Text in Illustration

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 ASSEMBLY Removal
OK -- Continue to next step.

105. INSPECT 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 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.

106. CHECK 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 may have a sealing problem.

B -- CHECK INTAKE VALVE

A -- REPLACE FUEL INJECTOR ASSEMBLY Removal

107. 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

108. 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 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.

109. CHECK CYLINDER COMPRESSION PRESSURE

(a) Check the compression Engine.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- CHECK VALVE TIMING

110. 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.

111. 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.

112. 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.

113. 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.

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

116. INSPECT CRANKSHAFT POSITION SENSOR

(a) Replace the crankshaft position sensor Removal.

(b) Check the engine start operation.

OK:

Malfunction has been repaired successfully.

NG -- INSPECT VVT SENSOR

OK -- END (CRANKSHAFT POSITION SENSOR IS DEFECTIVE)

117. INSPECT 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)