Inspection Procedure 7

COMMENT
- In cases such as the above, the cause is usually either weak spark, improper air-fuel mixture or low compression.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the ignition system.
- Malfunction of the injector system.
- Poor fuel quality.
- Poor compression.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

STEP 1. Check the battery voltage.
1. Measure the battery voltage during cranking.
- The voltage is 8 volts or more.
If the voltage should be 8 volts or more, go to Step 2.
If the voltage is less than 8 volts, check the battery. Refer to Battery. Then confirm that the malfunction symptom is eliminated.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 2. Using scan tool MB991502, read the diagnostic trouble code (DTC).
If DTC is not output, go to Step 3.
If DTC is output, go to Trouble Code Diagnostic Procedures.

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 3. Using scan tool MB991502, check data list and actuator test.
1. Check the following items in the actuator test.
Actuator Test Reference Table
a. Item 07: Fuel Pump.
2. Check the following items in the data list.
Data List Reference Table & Normal Scan Data Values
a. Item 21: Engine Coolant Temperature Sensor.
b. Item 18: Ignition Switch-ST.
If the checks above meet the specifications, go to Step 4. If the checks above do not meet the specifications, repair or replace. Then confirm that the malfunction symptom is eliminated.




STEP 4. Check the injector for operation sound.
1. Using a stethoscope or long blade screwdriver; check the operation sound ("tick-tick-tick") of injectors during idling or during cranking.
- An operation sound should be heard. If a sound is heard, go to Step 5.
If no sound is heard, refer to DTC P0201, P0202, P0203, P0204 - Injector Circuit Malfunction.

STEP 5. Check the ignition timing.
1. Check the ignition timing during cranking.

Standard value: 5° BTDC ± 3°

If within specifications, go to Step 6.
If not within the specifications, check that the crankshaft position sensor and timing belt cover are in the correct position. Then confirm that the malfunction symptom is eliminated.

STEP 6. Check the following items.
1. Check the following items, and repair or replace the defective items.
a. Check the ignition coils, spark plugs, spark plug cables.
b. Check if the injectors are clogged.
c. Check compression.
d. Check if foreign materials (water, kerosene, etc.) got into fuel.
Then confirm that the malfunction symptom is eliminated.