1995 Volvo 850 Engine Troubleshooting With Codes
If no faults were found while performing procedures in the F - BASIC TESTING article, proceed with self-diagnostics. If no fault codes are present, proceed to the H - TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.). NOTE: All voltage tests should be performed using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in testing procedures.
SELF-DIAGNOSTIC SYSTEM
RETRIEVING CODES
CAUTION: Self-diagnostics for fuel injection and ignition systems are separate. Use proper information for system being diagnosed.
Fuel Injection & Ignition Systems
Each system features a self-diagnostic function for fault tracing. Codes are retrieved using diagnostic unit “A” located in engine compartment, in front of right strut tower. Diagnostic unit “A” is equipped with an LED indicator, activation button and function selector cable.
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