Inspection Procedure 5

CIRCUIT OPERATION
- The ignition coil is energized by battery voltage from the ignition switch through the ignition failure sensor.
- When the ECM or PCM turns off its internal power transistor, battery positive voltage is applied to the ignition power transistor (terminal 3) inside the ignition coil, causing the ignition power transistor to be turned on.
- If the ignition power transistor is turned on, the primary circuit of the ignition coil is energized by grounding the ignition coil through terminal 2, causing the primary current to flow to the ignition coil.

COMMENT
- In cases such as the above, the cause is probably no spark, fuel delivery, or fuel quality problems.
In addition, foreign materials (water, kerosene, etc.) may be mixed with the fuel.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the ignition system.
- Malfunction of the fuel pump system.
- Malfunction of the injector system.
- Malfunction of the ECM .
- Malfunction of the PCM .
- Foreign materials in fuel.

WIRING DIAGRAM

CONNECTORS

DIAGNOSIS
Required Special Tools:
MB991502: Scan Tool (MUT-II)
MB991348: Test Harness

STEP 1. Check the battery voltage.
1. Measure the battery voltage during cranking.
- The voltage should be 8 volts or more. If the voltage is 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.

STEP 2. Check the timing belt for breaks.
If the timing belt is not broken, go to Step 3.
If the timing belt is broken, replace the timing belt. 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 3. Using scan tool MB991502, check data list and actuator test.
1. Check the following items in the data list.
Data List Reference Table & Normal Scan Data Values
a. Item 16: Power Supply Voltage.
b. Item 22: Crankshaft Position Sensor.
c. Item 21: Engine Coolant Temperature Sensor.

2. Check the following items in the actuator test.
Actuator Test Reference Table
a. Item 07: Fuel Pump.
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 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 circuit at the ignition coil connectors B-09, B-23.
1. Disconnect connectors B-09, B-23 and connect the test harness special tool (MB991348) in between. (All terminals should be connected.)
2. Connect the tachometer to each connector terminal 1.
3. Crank the engine.
- The tachometer should indicate a half cranking speed.
If the cranking speed is indicated, go to Step 6.
If the cranking speed is not indicated, refer to INSPECTION PROCEDURE 33 - Ignition Circuit System.

STEP 6. Check the ignition timing.
1. Check the ignition timing at cranking.

Standard value: 5° BTDC ± 3°

If within specifications, go to Step 7.
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 7. 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 if foreign materials (water, kerosene, etc.) got into fuel.
d. Check compression.
Then confirm that the malfunction symptom is eliminated.