NO.3 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [F2]

id010394912300

3

HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK
DESCRIPTION
•  The starter cranks the engine at normal speed but the engine requires excessive cranking time before starting.
•  The battery is in normal condition.
POSSIBLE CAUSE
•  Spark leakage from high-tension leads
•  Vacuum leakage
•  Poor fuel quality
•  Starting system malfunction
•  Spark plug malfunction
•  Air leakage from intake-air system
•  Erratic signal from CMP sensor
•  Improper air/fuel mixture ratio control
•  Air cleaner restriction
•  PCV valve malfunction
•  Inadequate fuel pressure
•  Purge solenoid valve malfunction
•  MAF sensor contamination
•  Restriction in exhaust system
•  Pressure regulator control (PRC) system 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 injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete the “BEFORE SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” described in this manual.
Caution
•  If there is foreign material on the connecting area of the quick release connector, it might damage the connector or fuel pipe. To prevent this, disconnect the connector and clean the connecting area before connecting.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Inspect for the following:
•  Vacuum leakage
•  Fuel quality (e.g. proper octane, contamination, winter/summer blend)
•  Loose bands on intake-air system
•  Cracks on intake-air system parts
•  Air cleaner restriction
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 1.
2
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Yes
DTC is displayed:
•  Go to appropriate the DTC inspection.
No
No DTC is displayed:
•  Inspect instrument cluster operation.
3
Is the engine overheating?
Yes
Go to symptom troubleshooting “No.16 Cooling system concerns – Overheating”.
No
Go to the next step.
4
Inspect for cracks on high-tension leads.
Are there any cracks on high-tension leads?
Yes
Repair suspected high-tension leads.
No
Go to the next step.
5
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 the fuel injector.
No
Install spark plugs on original cylinders.
Go to the next step.
6
Visually inspect the CMP sensor.
Is CMP sensor normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
7
Remove PCV valve and inspect PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
8
Install fuel pressure gauge between the fuel filter and the fuel distributor.
Connect a jumper wire between F/P terminal at DLC in engine compartment and GND.
Turn the ignition switch to the ON position.
Is fuel line pressure correct?
(See FUEL PUMP UNIT INSPECTION [F2].)
Yes
Go to the next step.
No
Zero or low:
Inspect the fuel pump circuit.
Inspect for open the fuel pump relief valve.
Inspect for the fuel leakage inside pressure regulator.
Inspect for clogged main fuel line.
Inspect PRC solenoid valve and related vacuum hose and harnesses.
High:
Inspect pressure regulator for high pressure cause.
Inspect for clogged fuel return line.
9
Is fuel line pressure held after the ignition switch is turned off?
(See FUEL PUMP UNIT INSPECTION [F2].)
Yes
Go to the next step.
No
Inspect the pressure regulator diaphragm condition.
•  If condition is normal, inspect the fuel injector.
•  If condition is not normal, replace the pressure regulator.
10
Disconnect a vacuum hose from the pressure regulator and plug hose.
Start the engine.
Does fuel line pressure remain within ±20 kPa {0.21 kgf/cm2, 3 psi} while driving vehicle?
Yes
Go to the next step.
No
Inspect for clogged fuel filler.
11
Connect a vacuum hose to pressure regulator.
Install vacuum gauge to intake manifold.
Start the engine.
Does fuel pressure gauge reading increase as vacuum gauge reading decreases and/or fuel pressure gauge reading decrease as vacuum gauge reading increases?
Yes
Go to the next step.
No
Connect vacuum hose to pressure regulator.
Start engine.
Verify fuel pressure gauge reading changes as vacuum changes.
If it changes, inspect vacuum line.
If it does not change, replace pressure regulator.
12
Disconnect a vacuum hose from purge solenoid valve and plug opening end of vacuum hose.
Start the engine.
Is starting condition improved?
Yes
Inspect if purge solenoid valve sticks to open.
No
Go to the next step.
13
Inspect for contaminated MAF sensor.
Is there any contamination?
Yes
Replace MAF sensor.
No
Go to the next step.
14
Is there restriction in exhaust system?
Yes
Inspect exhaust system.
No
Go to the next step.
15
Inspect the starting system.
(See STARTER INSPECTION [F2].)
Is the starting system normal?
Yes
Inspect for loose connectors or poor terminal contact.
No
Repair or replace the components as required.
16
•  Verify test results.
―  If normal, return to diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service Information and perform repair or diagnosis.
•  If vehicle is repaired, troubleshooting completed.
•  If vehicle is not repaired or additional diagnostic information is not available, replace the PCM.