GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Fuel Injected Vehicles

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See Figures 1 through 12



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Fig. Fig. 1: Diagnostic trouble codes-1985-87 2.5L engine



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Fig. Fig. 2: Diagnostic trouble codes-1985-87 2.5L engine continued



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Fig. Fig. 3: Diagnostic trouble codes-1985-87 2.5L engine continued



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Fig. Fig. 4: Diagnostic trouble codes-1985-87 2.5L engine continued



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Fig. Fig. 5: Diagnostic trouble codes-1986-87 2.8L TBI engine



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Fig. Fig. 6: Diagnostic trouble codes-1986-87 2.8L TBI engine continued



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Fig. Fig. 7: Diagnostic trouble codes-1986-87 2.8L TBI engine continued



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Fig. Fig. 8: Diagnostic trouble codes-1986-87 2.8L TBI engine continued



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Fig. Fig. 9: Diagnostic trouble codes-1988-92 engines (except MFI-Turbo) and 1993 ECM equipped vehicles



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Fig. Fig. 10: Diagnostic trouble codes-1993 PCM equipped vehicles



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Fig. Fig. 11: Diagnostic trouble codes-1993 PCM equipped vehicles, continued



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Fig. Fig. 12: Diagnostic trouble codes-1993 VCM equipped vehicles

MFI-TURBO ENGINECode 12





-Diagnostic system check
 
Code 13 -Oxygen sensor (open circuit)
 
Code 14 -Coolant temperature sensor (high temperature indicated)
 
Code 15 -Coolant temperature sensor (low temperature indicated)
 
Code 21 -Throttle position sensor (signal voltage high)
 
Code 22 -Throttle position sensor (signal voltage low)
 
Code 23 -Manifold air temperature sensor (low temperature indicated)
 
Code 24 -Vehicle speed sensor
 
Code 25 -Manifold air temperature sensor (high temperature indicated)
 
Code 31 -Turbocharger wastegate overboost
 
Code 32 -EGR circuit
 
Code 33 -MAP sensor (signal voltage high/vacuum low)
 
Code 34 -MAP sensor (signal voltage low/vacuum high)
 
Code 35 -Idle speed error
 
Code 42 -Electronic spark timing circuit
 
Code 43 -Electronic spark control circuit
 
Code 44 -Oxygen sensor circuit (lean exhaust indicated)
 
Code 45 -Oxygen sensor circuit (rich exhaust indicated)
 
Code 51 -PROM error (faulty or incorrect PROM)
 

 
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