Part 2
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction
Continued
15. READ 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
*: Compression loss may have occurred in the engine assembly.
D -- READ FREEZE FRAME DATA
C -- CHECK AND REPAIR ENGINE ASSEMBLY
B -- INSPECT FUEL INJECTOR FOR PORT INJECTION
A -- REPLACE ENGINE COOLANT TEMPERATURE SENSOR Service and Repair
16. INSPECT FUEL INJECTOR FOR PORT INJECTION
(a) Check that no carbon is stuck to the fuel injector for port injection.
OK:
No carbon present.
NG -- REPLACE FUEL INJECTOR FOR PORT INJECTION Removal
OK -- Continue to next step.
17. CHECK FUEL SYSTEM
(a) Check for foreign matter such as iron particles around the fuel pump (for low pressure) (fuel pump, fuel pump filter, and inside the fuel tank), and for signs that the fuel pump (for low pressure) was stuck.
Result
B -- PERFORM SIMULATION TEST
A -- REPAIR OR REPLACE FUEL SYSTEM
18. READ 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 (104°F) 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 (104 to 194°F) (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 (194°F) 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 FOR PORT INJECTION
A -- Continue to next step.
19. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
HINT
For the fuel pressure inspection, refer to the following procedures Testing and Inspection.
(a) Attach a fuel pressure gauge and check the fuel pressure after stopping the engine.
Standard:
147 kPa (1.5 kgf/cm2, 21 psi) 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 SIMULATION TEST
A -- REPLACE PRESSURE REGULATOR
20. CHECK FUEL INJECTOR FOR PORT INJECTION
(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 FOR PORT INJECTION
(a) Inspect the fuel injectors Fuel Injector (for Port Injection).
Result:
B -- CHECK THROTTLE BODY
A -- REPLACE FUEL INJECTOR FOR PORT INJECTION 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 Service and Repair
23. CHECK INTAKE SYSTEM
(a) Check the intake system for vacuum leaks.
OK:
No leaks 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 -- CHECK MALFUNCTION CONDITION
A -- END
25. CHECK MALFUNCTION CONDITION
(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 , 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).
E -- INSPECT ENGINE COOLANT TEMPERATURE SENSOR
D -- INSPECT MASS AIR FLOW METER
C -- CHECK FUEL INJECTOR FOR PORT INJECTION
B -- PERFORM SIMULATION TEST
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 whether the starter pinion gear is spinning freely.
Result:
HINT
*: The battery may be fully depleted or there may be excess engine friction.
C -- INSPECT BATTERY
B -- CHECK STARTER ASSEMBLY
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.
- When the battery is depleted, the horn becomes quieter.
(3) Measure the battery voltage when cranking the engine.
Standard:
Approximately 6 V or higher (0°C (32°F) or higher)
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 covers and oil pan, and check for foreign matter such as metal 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 ASSEMBLY Testing and Inspection
29. CHECK STARTER ASSEMBLY
(a) Remove the starter assembly Removal and Replacement.
(b) Check for starter pinion gear wear and damage.
Standard:
There is no wear or damage.
(c) Install the starter assembly Removal and Replacement.
NG -- REPLACE STARTER ASSEMBLY Removal and Replacement
OK -- REPLACE DRIVE PLATE AND RING GEAR