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Home >> Buick >> 1991 >> LeSabre Custom, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.8L PFI >> Self-Diagnostic System >> Trouble Code Definition
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Trouble Code Definition

ECM/PCM TROUBLE CODE DEFINITION (1)

Code No. Circuit Affected
31 Park/Neutral Switch
33 MAP Sensor Signal Voltage High
34 MAP Sensor Signal Voltage Low
35 IAC Idle Speed Error
38 Brake Switch
39 TCC
41 Cam Sensor Loss
42 EST Circuit Open Or Grounded
43 ESC Error
44 Lean Exhaust Indication
45 Rich Exhaust Indication
46 Power Steering Pressure Switch
48 Misfire Diagnosis
51 (2) Faulty PROM, MEM-CAL or ECM/PCM
52 (2) Faulty/Missing CALPAC or MEM-CAL
58 Anti-Theft System Fault
63, 64 or 65 EGR Flow Check Error (H Body)
66 Low A/C Refrigerant Charge
69 A/C Head Pressure Switch
(1) Display of a Code 12 is normal when no reference pulses are received by control module (engine not running).
(2) PCM equipped models.
NOTE: Trouble code charts should only be used if SERVICE ENGINE SOON light is illuminated (indicating a current problem exists). Exceptions are Code 13, 15, 24, 44 and 45 charts, which may be used to help diagnose intermittent codes. Anytime control module-related Codes 51, 52 or 55 are displayed with another code, start with 50-series code first, then proceed to low profile numbered codes.
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