Engine Controls - Tests W/O Codes: Introduction

Before diagnosing symptoms or intermittent faults, perform steps in appropriate articles. For basic testing procedures, see the following.

For testing procedures using diagnosic codes, see the following.

For 850 T-5, see TESTS W/CODES - MOTRONIC 4.3 - TURBO .
For 850 GLT, see TESTS W/CODES - MOTRONIC 4.4 - TURBO .
For 850 Non-TLEV (A/T), refer to TESTS W/CODES - MOTRONIC 4.3 - NON-TURBO .
For 850 (M/T), 850 TLEV and 850R, refer to TESTS W/CODES - MOTRONIC 4.4 - NON-TURBO .

Use this article to diagnose driveability problems existing when a hard fault code is not present.

NOTE: Some driveability problems may have been corrected by manufacturer with a revised computer control unit. Check with manufacturer for latest computer application.

Symptom checks can direct the technician to malfunctioning component(s) for further diagnosis. A symptom should lead to a specific component, system test or adjustment.

Use intermittent test procedures to locate driveability problems that DO NOT occur when the vehicle is being tested. These test procedures should also be used if a soft (intermittent) trouble code was present, but no problem was found during self-diagnostic testing.

NOTE: For specific testing procedures, see appropriate SYSTEM/COMPONENT TESTS article:

For specifications, see appropriate article: