Inspection Procedure 5
INSPECTION PROCEDURE 5Cranks, Won't Start Circuit
- Refer to Inspection Procedure 29, Ignition Circuit.
CIRCUIT OPERATION
- Refer to Inspection Procedure 29, Ignition Circuit.
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.
- Foreign materials in fuel.
DIAGNOSIS
Required Special Tools:
MB991502: Scan Tool
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. Then confirm that the malfunction symptom is eliminated.
STEP 2. Check the timing belt for breaks. If the timing belt is broken, go to Step 3.
If the timing belt is not broken, replace the timing belt. Then confirm that the malfunction symptom is eliminated.
STEP 3. Using scan tool MB991502, check data list and actuator test.
CAUTION: To prevent damage to the scan tool, turn the Ignition switch "OFF" before connecting or disconnecting the scan tool.
(1) Check the following items in the data list.
Refer to P.13A-243, Data List Reference Table.
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. Refer to 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 power transistor connector A-26.
(1) Disconnect connector A-26 and connect the test harness special tool (MB991348) in between.
(All terminals should be connected.)
(2) Connect the tachometer to terminal 3.
(3) Crank the engine.
- The tachometer should indicate cranking speed.
If the cranking speed is indicated, go to Step 6.
If the cranking speed is not indicated, refer to INSPECTION PROCEDURE 29 - 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 specifications, check and repair the crankshaft position sensor. Check that the timing belt cover is 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 coil, 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.