Basic Inspection

When no malfunction code can be confirmed in the DTC check, trouble shoot all the possible circuits to be considered as a cause of the problems. In many cases, by carrying out the basic engine check shown in the following flow chart, the location causing the problem can be found quickly and efficiently. Therefore use of this check is essential in the engine trouble shooting.

1. Check battery positive voltage. Carry out this check with the engine stopped. If there is 11 V or more, go to next step. If the voltage is less than 11 V, charge or replace the battery.
2. Check if engine cranks. If the engine cranks, go to next step. If the engine does not crank, see TROUBLE SHOOTING - NO CODES article.
3. Check if the engine starts. If the engine starts, go to next step. If the engine does not start, go to step  7.
4. Visually check that the air filter is not excessively dirty or oily. If necessary, clean the filter with compressed air. First blow from inside thoroughly, then blow from the outside of the filter. If the results are OK, go to next step. If the results are not good, repair or replace.
5. Check the idle speed. See ON-VEHICLE ADJUSTMENTS - V6 & V8 article. If the results are OK, go to next step. If the results are not good, go to TROUBLE SHOOTING - NO CODES article.
6. Check ignition timing. See ON-VEHICLE ADJUSTMENTS - V6 & V8 article. If the results are OK, go to TROUBLE SHOOTING - NO CODES article. If the results are not good, continue to trouble shoot.
7. Check fuel pressure. See BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. If the results are OK, go to next step. If the results are not good, continue to trouble shoot.
8. Check for spark. See BASIC DIAGNOSTIC PROCEDURES - V6 & V8 article. If the results are OK, go to TROUBLE SHOOTING - NO CODES article. If the results are not good, continue to trouble shoot.