NO.4 HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK [L3 R.H.D.]

id0103a4801000

4

HARD TO START/LONG CRANK/ERRATIC START/ERRATIC CRANK

DESCRIPTION

• The starter cranks engine at normal speed but engine requires excessive cranking time before starting.
• The battery is in normal condition.

POSSIBLE CAUSE

• Erratic signal to ignition coil
• Vacuum leakage
• Poor fuel quality
• Starting system malfunction
• Spark plug malfunction
• Air leakage from intake-air system
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• Improper air/fuel mixture ratio control
• Air cleaner restriction
• IAC valve malfunction
• PCV valve malfunction
• Inadequate fuel pressure
• Purge valve malfunction
• MAF sensor contamination
• Incorrect MAF sensor GND voltage
• Restriction in exhaust system
• EGR valve malfunction
• Pressure regulator malfunction (built-in fuel pump unit)
Warning
The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read the following warnings before performing any fuel system-related procedures:
• 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 SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this manual.
(See BEFORE SERVICE PRECAUTION [L3].)
(See AFTER SERVICE PRECAUTION [L3].)
Caution
• Disconnecting/connecting quick release connector without cleaning them it may possibly cause damage to the fuel pipe or quick release connector. Always clean the quick release connector joint before disconnecting/connecting, and make sure that it is free of foreign material.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION

1
Inspect for the following:
• Vacuum leakage
• Proper fuel quality (such as proper octane, contamination, winter/summer blend)
• Loose bands on intake-air system
• Cracks on intake-air system parts
• Intake-air system restriction (e.g. air cleaner element, fresh air duct.)
Are all items normal?
Yes
Go to the next step.
No
Repair or replace if necessary.
Repeat Step 1.
2
Connect the WDS or equivalent to the DLC-2.
Retrieve any KOEO and KOER DTCs using WDS or equivalent.
Is any KOEO or KOER DTC displayed?
Yes

DTC is displayed:

Go to the appropriate DTC inspection.
No

No DTC is displayed:

Go to the next step.
3
Is the engine overheating?
Yes
Go to symptom troubleshooting "No.17 Cooling system concerns - Overheating".
No
Go to the next step.
4
Inspect the ignition coil-related wiring harnesses (intermittent open or short circuit) for all cylinders.
Are the wiring harnesses normal?
Yes
Go to the next step.
No
Repair the wiring harnesses
5
Inspect for cracks on the high-tension leads.
Are there any cracks on the high-tension leads?
Yes
Replace suspected high-tension lead.
No
Go to the next step.
6
Inspect the spark plugs.
Are any spark plugs wet, covered with carbon, or grayish white?
Yes

Spark plug is wet or covered with carbon:

Inspect for fuel leakage from fuel injector.

Spark plug is grayish white:

Inspect the fuel injector for clogging.
No
Install the spark plugs on the original cylinders.
Go to the next step.
7
Visually inspect the CKP sensor and teeth of crankshaft pulley teeth.
Are the CKP sensor and teeth of crankshaft pulley teeth normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
8
Measure the gap between the CKP sensor and crankshaft pulley teeth.

Specification

0.5-1.9 mm {0.020-0.75 in}

Is the gap within the specification?
Yes
Go to the next step.
No
Adjust the CKP sensor.
9
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
10
Install a fuel pressure gauge between the fuel pipe and fuel distributor.
Connect the WDS or equivalent to the DLC-2 in
Turn the fuel pump on using the FP PID.
Is the fuel line pressure correct?
Yes
Go to the next step.
No

Zero or low:

Inspect the fuel pump, IFS switch and fuel pump relay related circuit.
Inspect for clogged fuel line.
• If normal, replace the fuel pump unit.

High:

Replace the fuel pump unit.
11
Is the fuel line pressure held after the FP PID is turned off?
Yes
Go to the next step.
No
Inspect the fuel injector.
• If the fuel injector is normal, replace fuel pump unit.
12
Disconnect a vacuum hose from the purge valve and plug the opened end of vacuum hose.
Start the engine.
Does the starting condition improve?
Yes
Inspect if the purge valve is stuck open.
No
Go to the next step.
13
Inspect the MAF sensor for the following:
• Contamination
• MAF sensor terminal B voltage (GND circuit)
Is there any contamination?
Yes
Repair or replace malfunctioning part.
No
Go to the next step.
14
Visually inspect the exhaust system part.
Is there any deformed exhaust system part?
Yes
Replace the suspected part.
No
Go to the next step.
15
Inspect engine condition while tapping the EGR valve housing.
Does engine condition improve?
Yes
Replace the EGR valve.
No
Go to the next step.
16
Inspect the starting system.
Is starting system normal?
Yes
Inspect for loose connectors or poor terminal contact.
• If there is no malfunction, remove EGR valve and visually inspect for mechanically stuck EGR valve
No
Repair or replace components as required.
17
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If any malfunction remains, inspect related service information, and repair or diagnosis accordingly.
- If the vehicle is repaired, troubleshooting is completed.
- If the vehicle is not repaired or additional diagnostic information is not available, replace the PCM.
(See PCM REMOVAL/INSTALLATION [L3].)