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 Diagnostic Trouble Codes - 1985  Buick

 

 Complements,
 

 

 

 

13 Open Oxygen Sensor Circuit
14 Coolant Sensor Circuit (Signal Voltage Low)
15 Coolant Sensor Circuit (Signal Voltage High)
21 Throttle Position Sensor (Signal Voltage High)
22 Throttle Position Sensor (Signal Voltage Low)
24 VSS Buffer Not Attach to I.P.Clstr. '85 VIN 3(3.8L)MPFI
32 EGR Vacuum Control
33 Mass Air Flow Sensor (Signal Frequency High)
34 Mass Air Flow Sensor (Signal Frequency Low)
42 Electronic Spark Timing, 1985 VIN 3 (3.8L) MPFI  
42 HEI-W/EST (VIN 3)  
43 Electronic Spark Control (ESC) Circuit  
44 Oxygen Sensor Circuit (Lean Exhaust Indicated)  
45 Oxygen Sensor Circuit (Rich Exhaust Indicated)  
51 PROM  
52 CALPAK  
55 ECM  

To extract a trouble code from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.

Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.

After Code 12 is displayed, any stored trouble codes will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All codes are displayed 3 times each then a code 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.

 



 

 

 

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