Related Tests, Information and Procedures

Diagnostic test procedures are split into two categories; No Start and Driveability. It is not necessary to perform both categories for every performance related problem. Selection of what category to use will be determined by the nature of the performance problem. Always begin at Test 1 of each category. Starting at any test other than Test 1 may result in incorrect diagnosis.
Each test may have many steps, however, only perform the steps as indicated according to test procedure. Before proceeding to the next test, ensure all wires and hoses are reconnected, engine is turned Off and any removed components are reinstalled. On 1989 models, always perform the verification test after vehicle repairs have been made.
On all models, ensure test vehicle has a fully charged battery. When performing a cold test, ensure engine has not been started for at least seven hours. When performing a warm test, ensure engine is at normal operating temperature.
On 1989 models, whenever replacement of the SMEC is required, the vehicles mileage must be copied to the memory of the replacement SMEC to enable proper operation of the emission maintenance reminder lamp. To copy mileage to a replacement SMEC, proceed as follows:
1. With the diagnostic readout box connected, select ``Emissions EMR Tests.'' Press the Yes key.
2. The display will now read ``EMR Memory Check.'' Press the Yes key once, then once again when the display reads ``EMR Memory Check, Are You Sure?''
3. The display will now ask you if the instrument panel mileage is between certain limits. If the answer is yes, press the Yes key, completing the test. If the answer is no, press the No key. After pressing the No key, the display will ask you if you want to correct the EMR mileage. Press the Yes key, enter the mileage as it reads on the instrument panel, then press the Enter key, completing the test.