Part 3

1UR-FE ENGINE CONTROL: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction - Continued

42. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Using the Techstream, select [Engine Speed] of the Data List.

(d) Start the engine.

(e) While running the engine, read the [Engine Speed] value.

Standard:

A value that matches the actual engine speed is constantly output.

HINT
- Check the engine speed using a line graph.
- If the engine cannot be started, check the engine speed while cranking the engine.
- If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.

NG -- CHECK CRANKSHAFT POSITION SENSOR CIRCUIT P0335
OK -- Continue to next step.

43. CHECK HARNESS AND CONNECTOR (IGNITION COIL POWER SOURCE)

(a) Disconnect the ignition coil with igniter connector.

(b) Turn the engine switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

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 -- CHECK POWER SOURCE CIRCUIT P0351
OK -- Continue to next step.

44. CHECK HARNESS AND CONNECTOR (IGNITION COIL - ECM)

(a) Disconnect the ignition coil with igniter connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

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.
- If the wire harness is normal, after replacing the ignition coil, check if engine starting trouble occurs again. If engine starting trouble occurs again, proceed to step 74 and perform troubleshooting for the ignition system (steps 80 to 85).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE IGNITION COIL Removal

46. 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) Using the Techstream, select the [Control the Fuel Pump / Speed] Active Test.

(d) When performing the Active Test, check for an operating sound from the fuel pump.

Standard:

HINT
Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

NG -- CHECK FUEL PUMP CONTROL SYSTEM Fuel Pump Control Circuit
OK -- Continue to next step.

47. 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) Using the Techstream, select the [Control the Fuel Pump / Speed] Active Test.

(d) 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 occurs again, proceed to step 74 and perform fuel system troubleshooting (steps 75 to 79).

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

A -- REPAIR OR REPLACE FUEL LINE

48. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Using the Techstream, select [Engine Speed] of the Data List.

(d) Start the engine.

(e) While running the engine, read the [Engine Speed] value.

Standard:

A value that matches the actual engine speed is constantly output.

HINT
- Check the engine speed using a line graph.
- If the engine cannot be started, check the engine speed while cranking the engine.
- If the engine speed is 0 rpm, the crankshaft position sensor may have an open or short circuit.

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

49. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR POWER SOURCE)

(a) Disconnect the injector connector.

(b) Turn the engine switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Text in Illustration

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 POWER SOURCE CIRCUIT Fuel Injector Circuit
OK -- Continue to next step.

50. CHECK HARNESS AND CONNECTOR (FUEL INJECTOR - ECM)

(a) Disconnect the injector connector.

(b) Disconnect the ECM connector.

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

Standard Resistance:

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 -- REPLACE ECM Removal

51. CHECK MASS AIR FLOW METER

(a) Connect the Techstream to the DLC3.

(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

HINT
The A/C switch and all accessory switches should be off, and the shift lever should be in N or P.

(c) Turn the Techstream on.

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

(e) Check MAF in the Data List during idling.

Standard:

3.4 to 6.2 gm/s.

NG -- CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER - ECM)
OK -- Continue to next step.

52. CHECK INTAKE SYSTEM

(a) Check for air leakage in the intake system [vacuum hose disconnection, cracks, damaged gaskets, etc.] Intake System.

HINT
- If the accelerator pedal is released after racing the engine, the inspection is easier to perform because the vacuum inside the intake manifold increases and the air suction noise becomes louder.
- If Short FT and Long FT are largely different from the normal values (differ by more than 15%) when idling (intake air volume is small) and almost the same as the normal values when racing the engine (for example, when maintaining a speed of 3000 rpm) (intake air volume is high), air leakage may be present.

Standard:

There is no air leakage.

NG -- REPAIR OR REPLACE INTAKE SYSTEM
OK -- Continue to next step.

53. CHECK THROTTLE BODY

(a) Disconnect the throttle body connector.

HINT
When the connector is disconnected, the vehicle enters fail-safe mode and the throttle valve opening angle is 4 to 7°.

(b) Crank the engine and check that it starts.

Result:

(c) Connect the throttle body connector.

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

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM)
A -- Continue to next step.

54. CHECK THROTTLE BODY

(a) Check if carbon is in the air flow passage.

Standard:

No carbon present.

NG -- REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
OK -- Continue to next step.

55. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT SYSTEM)

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT System (Bank 1) or Control the VVT System (Bank 2).

HINT
When performing the Active Test, make sure the A/C is on and the shift lever is in P or N.

(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

OK:

Result

HINT
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
- If the camshaft timing oil control valve assembly is stuck ON, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall.

B -- PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR)

A -- REPLACE CAMSHAFT OIL CONTROL VALVE (for Intake Side) Removal

56. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE VVT EXHAUST LINEAR)

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Warm up the engine.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the VVT Exhaust Linear (Bank1) or Control the VVT Exhaust Linear (Bank2).

HINT
When performing the Active Test, make sure the A/C is on and the shift lever is in P or N.

(e) Check the engine speed while operating the Oil Control Valve (OCV) using the Techstream.

OK*1:

HINT
- *1: From step 74, perform intake system troubleshooting (steps 86 to 88). If engine starting trouble still occurs, perform fuel system troubleshooting A (steps 89 to 96).
- Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.
- When the results of the inspection using the Active Test are normal but the valve operating noise is abnormal, check the valve for any signs of problems.
- If the camshaft timing oil control valve assembly is stuck ON, the valve overlap increases and combustion worsens due to the internal EGR which may cause the engine to stall.

NG -- REPLACE CAMSHAFT OIL CONTROL VALVE (for Exhaust Side) Removal
OK -- Continue to next step.

57. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE EGR STEP POSITION)

(a) Connect the Techstream to the DLC3.

(b) Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

HINT
- When performing the Active Test, make sure the shift lever is in P or N.
- The A/C switch and all accessory switches should be off.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the EGR Step Position.

(e) Confirm the Throttle Idle Position is ON and check the engine idling condition and MAP values in the Data List while performing the Active Test.

HINT
- Do not leave the EGR valve open for 10 seconds or more during the Active Test.
- Be sure to return the EGR valve to step 0 when the Active Test is completed.

OK:

MAP and idling condition change in response to EGR step position as follows.

Standard:

OK -- CHECK MALFUNCTION CONDITION

NG -- INSPECT EGR VALVE