Part 2

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

12. 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 FUEL INJECTOR POWER SOURCE CIRCUIT
OK -- Continue to next step.

13. 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.
- 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 -- CHECK FUEL SYSTEM

A -- REPAIR OR REPLACE FUEL LINE

14. CHECK FUEL SYSTEM

(a) Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump was stuck.

Result

B -- PERFORM SIMULATION TEST

A -- REPAIR OR REPLACE FUEL SYSTEM

15. CHECK FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

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

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result:

HINT
*1: Compression loss may have occurred in the engine assembly.

B -- INSPECT FUEL INJECTOR

C -- CHECK AND REPAIR ENGINE

D -- CHECK FREEZE FRAME DATA

A -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Removal

16. INSPECT FUEL INJECTOR

(a) Check that no carbon is stuck to the fuel injector.

OK:

No carbon present.

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

17. CHECK FUEL SYSTEM

(a) Check for foreign matter such as iron particles around the fuel pump (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump was stuck.

Result

B -- PERFORM SIMULATION TEST

A -- REPAIR OR REPLACE FUEL SYSTEM

18. CHECK FREEZE FRAME DATA

(a) Connect the Techstream to the DLC3.

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

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Freeze Frame Data.

Result:

HINT
*1: If the engine coolant temperature is 40°C or less (after stopping the engine and the vehicle is not driven for a long period of time), the pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

*2: If the engine coolant temperature is 40 to 90°C (15 to 120 minutes have passed after stopping the engine), there may be fuel leaking from a fuel injector.

*3: If the engine coolant temperature is 90°C or more (2 to 5 minutes have passed after stopping the engine), there may be a problem with the pressure regulator failing to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

B -- CHECK FUEL INJECTOR
A -- Continue to next step.

19. 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

A -- PERFORM SIMULATION TEST

B -- REPLACE PRESSURE REGULATOR Removal

20. 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 THROTTLE BODY
A -- Continue to next step.

21. CHECK FUEL INJECTOR

(a) Inspect the fuel injectors Testing and Inspection.

Result:

B -- CHECK THROTTLE BODY

A -- REPLACE FUEL INJECTOR Removal

22. CHECK THROTTLE BODY

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

Result:

B -- CHECK INTAKE SYSTEM

A -- CLEAN OR REPLACE THROTTLE BODY Removal

23. CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leak Intake System.

OK:

No leak in intake system.

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

24. PERFORM SIMULATION TEST

(a) Check if the engine can be started.

Result:

B -- CONFIRM PROBLEM SYMPTOM

A -- END

25. CONFIRM PROBLEM SYMPTOM

(a) Confirm the problem symptoms.

HINT
The problem symptoms below can be determined by reading the freeze frame data.

Result:

HINT
- If there is hesitation (cranking speed is slow and combustion occurs before passing TDC) during the initial cranking period, the battery charge may be insufficient or the starter may be malfunctioning.
- *1: If there is no initial combustion, a wire harness may be malfunctioning, or the ignition or fuel system may be malfunctioning.
- *2: If the engine stalls after starter turnoff, the air-fuel ratio may be incorrect or the camshaft timing oil control valve may have a problem returning.
- *3: If the initial combustion and starter turnoff occur late, the fuel injection volume may be incorrect (too low or too high).

B -- PERFORM SIMULATION TEST

C -- CHECK FUEL INJECTOR

D -- CHECK MASS AIR FLOW METER

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

26. PERFORM SIMULATION TEST

(a) When cranking the engine, check for a noise indicating that the starter pinion gear is extending, and check that the starter pinion gear is not spinning freely.

Result:

HINT
*1: The battery may be fully depleted or there may be excess engine friction.

B -- CHECK STARTER

C -- INSPECT BATTERY
A -- Continue to next step.

27. INSPECT BATTERY

(a) Check the electrolyte quantity.

Standard:

Electrolyte quantity is within the specified range.

(b) Inspect the specific gravity.

(1) Inspect the specific gravity of each cell.

Standard specific gravity:

1.25 to 1.29 (electrolyte is at 20°C (68°F))

HINT
- If the result is not as specified, recharge or replace the battery.
- It is not necessary to inspect a maintenance-free battery.

(c) Inspect the battery voltage.

(1) Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery.

(2) Measure the battery voltage.

Standard voltage:

12.5 to 12.9 V (electrolyte is at 20°C (68°F))

HINT
If the result is not as specified, recharge or replace the battery.

(3) Measure the battery voltage when cranking the engine.

Standard:

Approximately 6 V or higher (0°C (32°F) or higher)

HINT
When the battery is depleted, the horn becomes quieter.

NG -- CHARGE OR REPLACE BATTERY
OK -- Continue to next step.

28. CHECK ENGINE ASSEMBLY

(a) Check that the crankshaft rotates smoothly when rotating it by hand.

OK:

Crankshaft rotates smoothly.

HINT
Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.

NG -- REPAIR OR REPLACE ENGINE ASSEMBLY

OK -- INSPECT STARTER

29. CHECK STARTER

(a) Remove the starter Removal.

(b) Check for starter pinion gear wear and damage.

Standard:

There is no wear or damage.

NG -- REPLACE STARTER

OK -- REPLACE DRIVE PLATE AND RING GEAR Removal

30. INSPECT BATTERY

(a) Check the electrolyte quantity.

HINT
*1: If the cranking speed is fast, there may be compression loss.

B -- CHECK AND REPAIR ENGINE
A -- Continue to next step.

33. INSPECT BATTERY

(a) Check the electrolyte quantity.

Standard:

Electrolyte quantity is within the specified range.

(b) Inspect the specific gravity.

(1) Inspect the specific gravity of each cell.

Standard specific gravity:

1.25 to 1.29 (electrolyte is at 20°C (68°F))

HINT
- If the result is not as specified, recharge or replace the battery.
- It is not necessary to inspect a maintenance-free battery.

(c) Inspect the battery voltage.

(1) Turn the engine switch off and turn on the headlights for 20 to 30 seconds. This will remove the surface charge from the battery.

(2) Measure the battery voltage.

Standard voltage:

12.5 to 12.9 V (electrolyte is at 20°C (68°F))

HINT
If the result is not as specified, recharge or replace the battery.

(3) Measure the battery voltage when cranking the engine.

Standard:

Approximately 6 V or higher (0°C (32°F) or higher)

HINT
When the battery is depleted, the horn becomes quieter.

NG -- CHARGE OR REPLACE BATTERY
OK -- Continue to next step.

34. CHECK ENGINE

(a) Check that the crankshaft rotates smoothly when rotating it by hand.

OK:

Crankshaft rotates smoothly.

HINT
Excess engine friction may have occurred temporarily. Remove the cylinder head cover and oil pan, and check for foreign matter such as iron fragments. If there is a malfunction or signs of a malfunction present, perform a detailed inspection by disassembling all the parts.

NG -- REPAIR OR REPLACE ENGINE

OK -- INSPECT STARTER

35. CHECK FUEL INJECTOR

(a) Using a sound scope or screwdriver, check for an injector operating noise while cranking the engine.

OK:

Fuel injector operating noise is heard.

NG -- READ VALUE USING TECHSTREAM (ENGINE SPEED)
OK -- Continue to next step.

36. CHECK FUEL PRESSURE

(a) Inspect the fuel pressure Fuel System.

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

37. CHECK SPARK PLUG AND SPARK

(a) Check for sparks Testing and Inspection.

NG -- CHECK SPARK PLUG
OK -- Continue to next step.

38. CONFIRM VEHICLE CONDITION

(a) Confirm the conditions present when the malfunction occurred based on the customer problem analysis.

Result:

HINT
*1: The pressure regulator may be stuck open. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

*2: Fuel may be leaking from a fuel injector.

*3: The pressure regulator may not be able to maintain the fuel pressure. Attach a fuel pressure gauge and check the ability to maintain fuel pressure after stopping the engine.

*4: From step 74, perform fuel system troubleshooting C (steps 75 to 79).

B -- CHECK FUEL INJECTOR

C -- CHECK MALFUNCTION CONDITION
A -- Continue to next step.

39. 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.

Result:

HINT
- If the engine cannot be started, check the fuel pressure after cranking the engine.
- *1: From step 74, perform fuel system troubleshooting C (steps 75 to 79).

A -- CHECK MALFUNCTION CONDITION

B -- REPLACE PRESSURE REGULATOR Removal

40. CHECK FUEL INJECTOR

(a) 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.
- *1: From step 74, perform fuel system troubleshooting C (steps 75 to 79).

B -- CHECK MALFUNCTION CONDITION

A -- REPLACE FUEL INJECTOR Removal

41. CHECK SPARK PLUG

(a) Inspect the spark plugs Testing and Inspection.

HINT
Even if the spark plug of only one cylinder is malfunctioning, replace the spark plugs of all cylinders.

NG -- REPLACE SPARK PLUG Removal
OK -- Continue to next step.