NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK


4	HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
DESCRIPTION	• The starter cranks engine at the normal speed but the engine requires excessive cranking time before starting. • The battery is in the normal condition.
POSSIBLE CAUSE	• Vacuum leakage • Air leakage from intake-air system • Air suction at intake-air system (between MAF sensor and intake ports) • Air cleaner restriction • Improper operation of drive-by-wire control system • Drive-by-wire control system operates in fail-safe function • Throttle body malfunction (stuck open) • SSV stuck open • SSV solenoid valve malfunction (stuck open) • APV stuck open* • APV motor malfunction* • APV position sensor malfunction* • Poor fuel quality • Jet air mixing system malfunction (restriction or leakage at air passage) • Inadequate fuel pressure • Pressure regulator malfunction (integrated in fuel pump) • Fuel injector (FP1) (RP1) is clogged. • Open or short in fuel injector (FP1) (RP1) control signal circuit • Restriction in exhaust system • Purge solenoid valve malfunction (stuck open) • Improper air/fuel ratio control (abnormal ECT signal to PCM) • Erratic signal form eccentric shaft position sensor • MAF sensor contamination (abnormal signal to PCM) • MAF sensor improper installation • Low engine compression – Engine internal malfunction – Abnormal engine oil condition (viscosity, deterioration) – Low oil pressure – Excessive fuel pressure – Air mixed in oil line – Metering oil pump malfunction • Leakage or clogging in oil pipe • Leakage or clogging in oil nozzle • Starting system malfunction • Spark leakage from high-tension leads • Spark plug malfunction Warning The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the following warnings before servicing the fuel system: • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel. • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR PROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE REPAIR PROCEDURE.) (See AFTER REPAIR PROCEDURE.) Caution • Disconnecting/connecting quick release connector without cleaning it may possibly cause damage to fuel pipe and quick release connector. Always clean quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.


STEP	INSPECTION	RESULTS	ACTION
1	Does the engine knock/ping/detonate?	Yes	Go to the symptom troubleshooting "No.13 Knocking/pinging/detonation-Acceleration/cruise". (See NO.13 KNOCKING/PINGING/DETONATION-ACCELERATION/CRUISE.)
1	Does the engine knock/ping/detonate?	No	Go to the next step.
2	Inspect for the following: • Vacuum leakage • Proper fuel quality (e.g. proper octane, contamination, winter/summer blend) • Blockage at intake-air system (between MAF sensor and intake ports) • Loose bands on intake-air system hoses • Cracks in intake-air system • Air cleaner restriction • Jet air mixing system air passage (clogging or leakage) • MAF sensor installation Are all the items normal?	Yes	Go to the next step.
2		No	Service if necessary. Repeat Step 2.
3	Connect the WDS or equivalent to the DLC-2. Retrieve any KOEO and KOER DTCs. Are there any KOEO or KOER DTCs displayed?	Yes	DTC is displayed: Go to the applicable DTC inspection. (See DTC TABLE.)
3		No	No DTC is displayed: Go to the next step.
4	Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Inspect the readings on both the ECT PID and the temperature gauge on the instrument cluster readings. Does the ECT PID indicate the same temperature as the gauge readings?	Yes	Go to the next step.
4		No	If the temperature gauge is in the normal range but the ECT PID is not the same as temperature gauge reading, inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.) If the temperature gauge on instrument cluster indicates the cold range but the ECT PID is normal, inspect the temperature gauge and the sending unit. (See Water temperature gauge.)
5	Is the engine overheating?	Yes	Go to the symptom troubleshooting "No.17 Cooling system concerns - Overheating". (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING.)
5	Is the engine overheating?	No	Go to the next step.
6	Inspect for cracks on the high-tension leads. Are there any cracks on the high-tension leads?	Yes	Repair the suspected high-tension leads.
6		No	Go to the next step.
7	Inspect the spark plug conditions. Is the spark plug wet, covered with carbon or grayish white?	Yes	Spark plug is wet or covered with carbon: Inspect for fuel leakage from the fuel injector. Spark plug is grayish white: Inspect for clogged fuel injector (FP1) (RP1).
7		No	Install the spark plugs in the original positions. Go to the next step.
8	Visually inspect the eccentric shaft position sensor and the teeth of the pulse wheel. Are the eccentric shaft position sensor and the teeth of the pulse wheel normal?	Yes	Go to the next step.
8		No	Replace the malfunctioning parts.
9	Attempt to start the engine at part throttle. Does the engine run smoothly at part throttle?	Yes	Inspect the drive-by-wire control system operation. (See Drive-by-wire Control System Inspection.)
9		No	Go to the next step.
10	Install the fuel pressure gauge to the fuel line quick release connector. Short the check connector terminal F/P to the body GND using a jumper wire. Turn the ignition switch to the ON position. Is the fuel line pressure correct with the ignition switch ON? (See FUEL LINE PRESSURE INSPECTION.)	Yes	Go to the next step.
10		No	Zero or low: Inspect for clogged fuel line. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.) High: Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
11	Is the fuel line pressure held after the ignition switch is turned off? (See FUEL LINE PRESSURE INSPECTION.)	Yes	Go to the next step.
11		No	Inspect the fuel injector. (See FUEL INJECTOR INSPECTION.) If the fuel injector is normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
12	Disconnect the vacuum hose from the purge solenoid valve and plug the opening end of vacuum hose. Attempt to start the engine. Is the starting condition improved?	Yes	Inspect if the purge solenoid valve sticks open.
12		No	Go to the next step.
13	Inspect the MAF sensor for contamination. Is there any contamination?	Yes	Replace the MAF sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
13		No	Go to the next step.
14	Visually inspect the exhaust system part. Is there any deformed exhaust part?	Yes	Replace the suspected part.
14		No	Go to the next step.
15	Inspect the starting system. (See STARTER INSPECTION.) Is the starting system normal?	Yes	Inspect engine compression. (See COMPRESSION INSPECTION.)
15		No	Repair or replace components if required.
16	Inspect the engine compression. (See COMPRESSION INSPECTION.) Is it normal?	Yes	Go to Step 22.
16		No	Go to the next step.
17	Perform the metering oil pump control inspection. (See Metering Oil Pump Control Inspection.) Does the metering oil pump control operate properly?	Yes	Go to the next step.
17		No	Repair or replace the malfunctioning part according to inspection results. After that overhaul or replace the engine. (See Engine Workshop Manual.)
18	Check the engine oil condition. Is the engine oil low viscosity and/or is there a gasoline odor?	Yes	Replace the engine oil. Inspect the ECT sensor and the related wiring harnesses. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION.) After that overhaul or replace the engine. (See Engine Workshop Manual.)
18		No	Go to the next step.
19	Inspect the oil pressure. (See OIL PRESSURE INSPECTION.) Is the oil pressure within the specification?	Yes	Go to the next step.
19		No	Inspect and replace the malfunctioning part according to the inspection result. After that overhaul or replace the engine. (See Engine Workshop Manual.)
20	Turn the ignition switch off. Disconnect the fuel line quick release connector and install the fuel gauge to the fuel line. Note • If the engine will not start, inspect the fuel line pressure with the ignition switch ON while cranking. Start the engine and run it at idle. Measure the fuel line pressure at idle. Is the fuel line pressure correct at idle? (See FUEL LINE PRESSURE INSPECTION.)	Yes	Go to the next step.
20		No	Replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.) After that overhaul or replace the engine. (See Engine Workshop Manual.)
21	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there any air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at the engine. After that overhaul or replace the engine. (See Engine Workshop Manual.)
21		No	Overhaul or replace the engine. (See Engine Workshop Manual.)
22	Check the oil pipe between the metering oil pump and the metering oil nozzle. Is there any air and/or clogging in the oil pipe?	Yes	Inspect and repair for leakage and/or clogging in the oil passage at the engine.
22		No	Go to the next step.
23	Perform the fuel injector operation inspection. (See Fuel Injector Operation Inspection.) Does the fuel injector operate properly?	Yes	Go to the next step.
23		No	Repair or replace the malfunctioning part according to inspection result.
24	Inspect the fuel injectors for the following: (See FUEL INJECTOR INSPECTION.) • Leakage • Clogging • Injection amount Are the injectors normal?	Yes	Inspect the engine oil condition (viscosity, amount deterioration).
24		No	Replace the suspected fuel injector.
25	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If the malfunction remains, inspect the related Service Information and perform the repair or diagnosis.