Part 7

2ZR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction

Continued

100. 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 crankshaft position sensor connector.

(e) Reconnect the ECM connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal

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) Disconnect the fuel pump 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 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.
(c) Reconnect the fuel pump connector.

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

103. 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.

Standard:

Air does not flow

(f) Connect the connector of the purge VSV.

(g) Connect the vacuum hose of the purge VSV.

HINT
When this inspection is performed, the MIL may illuminate. After finishing the inspection, check and clear DTCs DTC Check / Clear.

NG -- INSPECT PURGE VSV
OK -- Continue to next step.

104. CHECK FUEL INJECTOR

(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 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 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.

107. CHECK CYLINDER COMPRESSION PRESSURE

(a) Check the compression Engine.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- CHECK VALVE TIMING

108. INSPECT ENGINE COOLANT TEMPERATURE SENSOR

(a) Inspect the engine coolant temperature sensor Removal.

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

109. 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.

110. 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.

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

Standard Resistance (Check for Short):

(a) Disconnect the camshaft position sensor (for intake camshaft) 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):

(a) Disconnect the camshaft position sensor (for exhaust camshaft) 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) Disconnect the camshaft position sensor (for exhaust camshaft) connector.

(e) Reconnect the ECM connector.

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

114. INSPECT CRANKSHAFT POSITION SENSOR

(a) Inspect the crankshaft position sensor Testing and Inspection.

NG -- REPLACE CRANKSHAFT POSITION SENSOR Removal
OK -- Continue to next step.

115. 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 ECM Removal

OK -- END (CAMSHAFT POSITION SENSOR IS DEFECTIVE)