#
NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [L3 Turbo]

id0103b4801000

4 | HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
--- | ---
DESCRIPTION | • Starter cranks the engine at normal speed but the engine requires excessive cranking time before starting. • Battery is operating normally
POSSIBLE CAUSE | • Vacuum leakage • Poor fuel quality • Starting system malfunction • Erratic signal to ignition coils • Spark plug malfunction • Air leakage from intake-air system • Improper air/fuel mixture ratio control • Incorrect fuel injection timing • Erratic signal from CKP sensor • Erratic signal from CMP sensor • A/F sensor, HO2S or related circuit malfunction • ECT sensor or related circuit malfunction • MAF sensor or related circuit malfunction • Intake-air system restriction • Improper operation of electronic throttle control system • PCV valve malfunction • Inadequate fuel pressure (high or low pressure side) • Relief valve malfunction (built-in delivery pipe) • Spill valve control solenoid valve malfunction (built-in high pressure fuel pump) • Fuel filter clogging • Fuel line restriction • Fuel leakage • Fuel pump (low-side) resister or related circuit malfunction • Fuel injector malfunction • Fuel pressure sensor malfunction • High pressure fuel pump malfunction • Exhaust system or three-way catalytic converter restriction • EGR valve malfunction • Purge solenoid valve malfunction • Low engine compression • Improper valve timing • Injector driver module or related circuit malfunction Warning The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: • 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 injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE REPAIR ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE SERVICE PRECAUTION [L3 Turbo].) (See AFTER SERVICE PRECAUTION [L3 Turbo].) Caution • Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP | INSPECTION | RESULTS | ACTION
--- | --- | --- | ---
1 | Inspect for the following: • Fuel quality (proper octane, contamination, winter/summer blend) • Fuel leakage • Intake-air system leakage or restriction • Vacuum leakage Are all items normal? | Yes | Go to the next step.
No | Service if necessary. Repeat Step 1.
2 | Perform the self-test function using the WDS or equivalent. Turn the ignition switch to the ON position. Retrieve any DTCs. Is a DTC displayed? | Yes | DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [L3 Turbo].)
No | No DTC is displayed: Go to the next step.
3 | Access the ECT PID using the WDS or equivalent. Verify that the ECT PID is less than 116°C {241°F} during driving. Is the ECT PID less than specified? | Yes | Go to the next step.
No | The cause of this concern could be from the cooling system overheating. Perform the symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS - OVERHEATING." (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3 Turbo].)
4 | Will the engine run smoothly at part throttle? | Yes | Go to the next step.
No | Go to Step 6.
5 | Perform the TP sweep inspection. (See Electronic Throttle Control System Inspection.) Does the electronic throttle control system work properly? | Yes | Visually inspect the throttle body (damage/scratching.) If normal, go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
6 | Perform the EGR system operation inspection. (See EGR Control System Inspection.) Does the EGR system operate properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
7 | Perform the Purge Control System Operation inspection. (See Purge Control System Inspection.) Does the purge solenoid valve work properly? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
8 | Inspect the CMP and CKP sensor for the following; • Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) • Damaged trigger wheel and camshaft • Open or short circuit in the wiring harnesses. Is there any malfunction detected? | Yes | Repair or replace the malfunctioning part according to the inspection results.
No | Go to the next step.
9 | Access and monitor following the PIDs using the data monitor function. • ECT • MAF • O2S11 • O2S12 • LONGFT1 • SHTFT1 Do the PIDs indicate the correct values under trouble condition? (See Using the WDS or Equivalent.) | Yes | Go to the next step.
No | Inspect and repair or replace suspected parts and the related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
10 | Remove and shake the PCV valve. Does the PCV valve rattle? | Yes | Go to the next step.
No | Replace the PCV valve.
11 | Inspect for restriction in the exhaust system and the three-way catalytic converter (TWC). Is there any restriction? | Yes | Replace the malfunctioning part.
No | Go to the next step.
12 | Perform the spark test. (See Spark Test.) Is a strong blue spark visible at each cylinder? | Yes | Go to the next step.
No | Inspect or replace the malfunctioning parts, according to the inspection results.
13 | Access and monitor the FUEL_PRES PID. Is the FUEL_PRES PID value within the specification? (See Using the WDS or Equivalent.) | Yes | Go to Step 38.
No | Go to the next step.
14 | Is the vehicle accelerate performance normally? | Yes | Go to the next step.
No | Go to Step 16.
15 | Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].) Is the fuel pressure sensor normal? | Yes | Go to Step 17.
No | Replace the delivery pipe.
16 | Replace the high pressure fuel pump. Monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specified? (See Using the WDS or Equivalent.) | Yes | Troubleshooting is completed. Go to Step 21.
No | Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)
17 | Connect the fuel pressure gauge between the fuel pump and the high pressure fuel pump. Measure the fuel pressure line of the low pressure side. (See FUEL LINE PRESSURE INSPECTION [L3 Turbo].) Is the fuel pressure within the specification? | Yes | Go to the next step.
No | Inspect for the following: • Fuel line restriction • Fuel filter clogging If normal replace the fuel pump.
18 | Inspect the fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION [L3 Turbo].) Are the fuel injectors normal? | Yes | Go to the next step.
No | Replace the suspected fuel injector. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
19 | Measure the compression pressure for each cylinder. (See COMPRESSION INSPECTION [L3 Turbo].) Does the starting system work properly? | Yes | Go to the next step.
No | Inspect for the following: • Damaged valve seat • Worn valve stem and valve guide • Worn or stuck piston ring • Worn piston, piston ring or cylinder • Improper valve timing Service if necessary.
20 | Inspect the starting system. (See STARTER INSPECTION [L8, LF, L3, L3 Turbo].) Does the starting system work properly? | Yes | Replace the injector driver module. If the problem remains, overhaul the engine.
No | Repair or replace the malfunctioning part.
21 | Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service information and perform the repair or diagnosis. - If the vehicle is repaired, troubleshooting is completed. - If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.