Part 2
1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction
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.
(b) Check for starter pinion gear wear and damage.
Standard:
There is no wear or damage.
(c) Install the starter assembly Installation.
NG -- REPLACE STARTER ASSEMBLY Removal
OK -- REPLACE DRIVE PLATE AND RING GEAR Removal
30. 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.
31. INSPECT STARTER ASSEMBLY
(a) Inspect the starter assembly Testing and Inspection.
NG -- REPLACE STARTER ASSEMBLY Removal
OK -- CHECK CRANKING HOLDING FUNCTION CIRCUIT Cranking Holding Function Circuit
32. PERFORM SIMULATION TEST
(a) Check the cranking speed.
Result:
HINT
*: If the cranking speed is fast, there may be compression loss.
B -- CHECK AND REPAIR ENGINE ASSEMBLY
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.
- 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.
34. 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
35. CHECK FUEL INJECTOR FOR PORT INJECTION
(a) Using a sound scope or screwdriver, check for a fuel injector for port injection operating noise while cranking the engine.
OK:
Fuel injector for port injection operating noise is heard.
NG -- READ VALUE USING TECHSTREAM (ENGINE SPEED)
OK -- Continue to next step.
36. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
(a) Inspect the fuel pressure (low pressure side) 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 for port injection.
*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 72, perform fuel system troubleshooting C (steps 73 to 78).
C -- CHECK MALFUNCTION CONDITION
B -- CHECK FUEL INJECTOR FOR PORT INJECTION
A -- Continue to next step.
39. CHECK FUEL PRESSURE (LOW PRESSURE SIDE)
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.
- *: From step 72, perform fuel system troubleshooting C (steps 73 to 78).
B -- CHECK MALFUNCTION CONDITION
A -- REPLACE PRESSURE REGULATOR Removal