Part 2

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1604: Startability Malfunction
P1604 - Startability Malfunction

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 FOR PORT INJECTION

D -- INSPECT 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
*: The battery may be fully depleted or there may be excess engine friction.

B -- CHECK STARTER ASSEMBLY

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

27. INSPECT BATTERY

(a) Check the electrolyte quantity.

OK:

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 ASSEMBLY Testing and Inspection

29. CHECK STARTER ASSEMBLY

(a) Remove the starter assembly.

HINT
- for 2WD Removal.
- for AWD Removal.

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

OK:

There is no wear or damage.

Result

B -- REPLACE DRIVE PLATE AND RING GEAR Replacement

C -- REPLACE DRIVE PLATE AND RING GEAR Replacement

A -- REPLACE STARTER ASSEMBLY

30. INSPECT BATTERY

(a) Check the electrolyte quantity.

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.

OK:

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 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 ASSEMBLY Testing and Inspection

35. CHECK FUEL INJECTOR FOR PORT INJECTION

(a) Using a sound scope or screwdriver, check for 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 of the system 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 of the pressure regulator to maintain fuel pressure after stopping the engine.

*4: From step 72, perform fuel system troubleshooting C (steps 73 to 78).

B -- CHECK FUEL INJECTOR FOR PORT INJECTION

C -- CHECK MALFUNCTION CONDITION
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

40. CHECK FUEL INJECTOR FOR PORT INJECTION

(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.
- *: From step 72, perform fuel system troubleshooting C (steps 73 to 78).

B -- CHECK MALFUNCTION CONDITION

A -- REPLACE FUEL INJECTOR FOR PORT INJECTION 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.

42. READ VALUE USING TECHSTREAM (ENGINE SPEED)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

(e) Start the engine.

(f) While running the engine, read the value of Engine Speed.

OK:

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 Cranking Holding Function Circuit
OK -- Continue to next step.

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

(a) Disconnect the E38, E30, E41, E33, E42, E34, E45 and E36 ignition coil connectors.

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

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

Standard Voltage:

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 (IGNITION COIL - IG2 RELAY)
OK -- Continue to next step.

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

(a) Disconnect the E38, E30, E41, E33, E42, E34, E45 and E36 ignition coil connectors.

(b) Disconnect the E2 and E4 ECM connectors.

(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.

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

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

(a) Disconnect the E38, E30, E41, E33, E42, E34, E45 and E36 ignition coil connectors.

(b) Disconnect the E2 and E4 ECM connectors.

(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.
- 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 72 and perform troubleshooting for the ignition system (steps 79 to 88).

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE IGNITION COIL

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) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump/Speed.

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

OK:

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

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