Filename: Volvo 850 Engine Troubleshooting With Codes
Language: English
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G – TESTS W/CODES 1995 Volvo 850 1995 ENGINE PERFORMANCE Volvo … SELF-DIAGNOSTIC SYSTEM RETRIEVING CODES CAUTION: Self-diagnostics for fuel injection and … 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 …
diagnosis. Once function selector cable has been inserted in correct socket, depress button and keep depressed for more than one second (but not more than 3 seconds). Observe LED and count number of flashes to determine diagnostic trouble code, as faults stored in Electronic Control Unit (ECU) memory are read by observing LED flashes. If LED does not flash, see DIAGNOSTIC UNIT “A” LED DOES NOT FLASH. Diagnostic systems for fuel injection and ignition each store 13 codes. All codes contain 3 digits (example: 4-1-3). Since all codes have 3 digits, each code requires 3 series of flashes. A 3-second interval separates each series of flashes. See the appropriate TROUBLE CODE DEFINITION table. TROUBLE CODE IDENTIFICATION TROUBLE CODE DEFINITION – FUEL INJECTION SYSTEM (1) Code Fault/Repair 1-1-1 ……………………….. No Fault 1-1-2 ………………………………………….. Replace ECU 1-1-3 …………………… HO2S Integrator At Maximum Enrichment 1-2-1 ……………………… MAF Sensor Signal Absent Or Faulty 1-2-3 ………… Engine Temperature Sensor Signal Absent Or Faulty 1-3-1 ……………. Ignition System Speed Signal Absent Or Faulty 1-3-2 …………………….. Battery Voltage Too High Or Too Low 2-1-2 …………………….. HO2S Sensor Signal Absent Or Faulty 2-2-1 .. Adaptive HO2S Control, Engine Running Too Rich At Part Load 2-2-3 ………………………. IAC Valve Signal Absent Or Faulty 2-3-1 .. Adaptive HO2S Control, Engine Running Too Lean At Part Load 2-3-2 ……. Adaptive HO2S Control, Provides Richer Mixture At Idle 3-1-1 …………………….. Speedometer Signal Absent Or Faulty 4-1-1 …………………. Throttle Switch Signal Absent Or Faulty 5-1-1 ……. Adaptive HO2S Control, Provides Leaner Mixture At Idle 5-1-2 ……………. HO2S Integrator At Maximum Lean Running Limit (1) – See FUEL INJECTION DIAGNOSIS under DIAGNOSTIC TROUBLE CODE TESTING for fault code diagnosis. TROUBLE CODE DEFINITION – IGNITION SYSTEM (1) Code Fault/Repair 1-1-1 ……………………………………………. No Faults 1-1-2 ………………………………………….. Replace ECU 1-2-3 ….. Engine Temp. Signal From Fuel Injection Absent Or Faulty 1-3-1 …………………………………….. VSS Signal Absent 1-4-3 ………………. Front Knock Sensor Signal Absent Or Faulty 1-4-4 …………. Load Signal From Fuel Injection Absent Or Faulty 1-5-4 …………………………………….
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