AutoZone 1993 Chevrolet Truck K1500 Blazer 4WD 5.7L TBI 8cyl | Repair Guides | Driveability & Emissions Controls | Diagnostic Trouble Codes | Diagnostic Trouble Codes | AutoZone.com

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    1993 Chevrolet Truck K1500 Blazer 4WD 5.7L TBI 8cyl

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    Ford Pick-Ups/Bronco 1976-1986 Repair Guide

    DIAGNOSTIC TROUBLE CODES

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    The diagnostic trouble codes listed below apply to the 1985-86 5.0L EFI V-8 engine.



    Code 11- System pass
     
    Code 12- RPM unable to reach upper test limit
     
    Code 13- RPM unable to reach lower test limit
     
    Code 14- Pip circuit failure
     
    Code 15- ECA read only memory test failed
     
    Code 15- ECA keep alive memory test failed
     
    Code 16- IDM signal not received
     
    Code 18- SPOUT circuit open or spark angle word failure
     
    Code 18- IDM circuit failure or SPOUT circuit grounded
     
    Code 19- Failure in ECA internal voltage
     
    Code 21- ECT out ot self test range
     
    Code 22- BP sensor out of self test range
     
    Code 22- BP sensor or MAP out of range
     
    Code 23- TP sensor out of self test range
     
    Code 24- ACT sensor out of self test range
     
    Code 25- Knock not sensed during dynamic test
     
    Code 26- VAF/MAF out of self test range
     
    Code 26- TOT out of self test range
     
    Code 26- TOT sensor out of self test range (E-400)
     
    Code 28- Loss of IDM, right side
     
    Code 29- Insufficient input from vehicle speed sensor
     
    Code 31- PFE, EVP or EVR circuit below minimum voltage
     
    Code 32- EVP voltage below closed limit
     
    Code 33- EGR valve opening not detected
     
    Code 34- EVP voltage above closed limit
     
    Code 35- PFE or EVP circuit above closed limit
     
    Code 41- HEGO sensor circuit indicates system lean
     
    Code 41- No HEGO switching detected
     
    Code 42- HEGO sensor circuit indicates system rich
     
    Code 44- Thermactor air system inoperative-right side
     
    Code 45- Thermactor air upstream during self test
     
    Code 45- Coil 1,2 or 3 failure
     
    Code 46- Thermactor air not bypassed during self test
     
    Code 47- 4WD switch closed (E40D)
     
    Code 48- Loss of IDM, left side
     
    Code 49- 1-2 shift error (E40D)
     
    Code 51- ECT/ACT reads -40°F or circuit open
     
    Code 52- Power steering pressure switch circuit open
     
    Code 52- Power steering pressure switch always open or closed
     
    Code 53- TP circuit above maximum voltage
     
    Code 54- ACT sensor circuit open
     
    Code 56- VAF or MAF circuit above maximum voltage
     
    Code 56- TOT reads -40°F or circuit open (E40D)
     
    Code 59- 2-3 shift error (E40D)
     
    Code 61- ECT reads 254°F or circuit grounded
     
    Code 63- TP circuit below minimum voltage
     
    Code 64- ACT sensor grounded or input reads 254°F
     
    Code 65- Overdrive cancel switch open, no change seen (E40D)
     
    Code 66- MAF sensor input below minimum voltage
     
    Code 66- TOT grounded or reads 290°F (E40D)
     
    Code 67- Neutral/drive switch open or A/C on
     
    Code 67- Clutch switch circuit failure
     
    Code 67- MLP sensor out of range or A/C on (E40D)
     
    Code 69- 3-4 shift error
     
    Code 72- Insufficient MAF/MAP change during dynamic test
     
    Code 73- Insufficient TP change during dynamic test
     
    Code 74- Brake on/off switch failure or not actuated
     
    Code 77- Operator error
     
    Code 79- A/C on during self test
     
    Code 79- A/C or defrost on during self test
     
    Code 81- Air management 2 circuit failure
     
    Code 82- Air management 1 circuit failure
     
    Code 84- EGR vacuum solenoid circuit failure
     
    Code 85- Canister purge solenoid circuit failure
     
    Code 86- Shift solenoid circuit failure
     
    Code 87- Fuel pump primary circuit failure
     
    Code 88- Loss of dual plug input control
     
    Code 89- Converter clutch solenoid circuit failure
     
    Code 91- Shift solenoid 1 circuit failure (E40D)
     
    Code 92- Shift solenoid 2 circuit failure (E40D)
     
    Code 93- Coast clutch solenoid circuit failure (E40D)
     
    Code 94- Converter clutch solenoid circuit failure (E40D)
     
    Code 95- Fuel pump secondary circuit failure- ECA to ground
     
    Code 96- Fuel pump secondary circuit failure-battery to ECA
     
    Code 97- Overdrive cancel indicator light-circuit failure(E40D)
     
    Code 98- Electronic pressure control driver open in ECA (E40D)
     
    Code 98- Hard fault present
     
    Code 99- Electronic pressure control circuit failure (E40D)
     
    Code 111- System pass
     
    Code 112- ACT sensor circuit grounded or reads 254° F
     
    Code 113- ACT sensor circuit open or reads -40° F
     
    Code 114- ACT outside test limits during KOEO or KOER tests
     
    Code 116- ECT outside test limits during KOEO or KOER tests
     
    Code 117- ECT sensor circuit grounded
     
    Code 117- ECT sensor circuit below minimum voltage or reads 254°F
     
    Code 118- ECT sensor circuit open
     
    Code 118- ECT sensor circuit below maximum voltage or reads -40°F
     
    Code 121- Closed throttle voltage higher or lower than expected
     
    Code 122- TP sensor circuit below minimum voltage
     
    Code 123- TP sensor circuit below maximum voltage
     
    Code 126- BP or MAP sensor higher or lower than expected
     
    Code 128- MAP vacuum circuit failure
     
    Code 129- Insufficient MAF or MAP change during dynamic responded test
     
    Code 144- No HEGO switching detected
     
    Code 167- Insufficient TP change during dynamic response test
     
    Code 171- Fuel system at adaptive limit, HEGO unable to switch
     
    Code 172- HEGO shows system always lean
     
    Code 173- HEGO shows system always rich
     
    Code 174- HEGO switching time is slow
     
    Code 179- Fuel at lean adaptive limit at part throttle; system rich
     
    Code 181- Fuel at rich adaptive limit at part throttle; system lean
     
    Code 182- Fuel at lean adaptive limit at idle; system rich
     
    Code 183- Fuel at rich adaptive limit at idle; system lean
     
    Code 211- PIP circuit fault
     
    Code 212- Loss of IDM input to ECA or SPOUT circuit grounded
     
    Code 213- Spout circuit open
     
    Code 224- Erratic IDM input to processor
     
    Code 225- Knocked not sensed during dynamic response test
     
    Code 311- Thermactor air system inoperative
     
    Code 312- Thermactor air upstream during self test
     
    Code 313- Thermactor air not bypassed during self test
     
    Code 327- EVP or DPFE circuit below minimum voltage
     
    Code 328- EGR closed voltage higher than expected
     
    Code 332- Insufficient EGR flow detected
     
    Code 334- EGR closed voltage higher than expected
     
    Code 337- EVP or DPFE circuit above maximum voltage
     
    Code 411- Cannot control rpm during KOER low rpm check
     
    Code 412- Cannot control rpm during KOER high rpm check
     
    Code 452- Insufficient input from vehicle speed sensor
     
    Code 511- EEC processor ROM test failed
     
    Code 512- EEC processor Keep Alive Memory test failed
     
    Code 513- Failure in EEC processor internal voltage
     
    Code 519- Power steering pressure switch circuit open
     
    Code 521- Power steering pressure switch did not change state
     
    Code 525- Vehicle in gear or A/C on during self test
     
    Code 536- Brake on/off circuit failure, switch not actuated during KOER test
     
    Code 538- Insufficient RPM change during KOER dynamic response test
     
    Code 538- Operator error
     
    Code 542- Fuel pump secondary circuit failure: ECA to ground
     
    Code 543- Fuel pump secondary circuit failure: Battery to ECA
     
    Code 552- Air management 1 circuit failure
     
    Code 553- Air management 2 circuit failure
     
    Code 556- Fuel pump primary circuit failure
     
    Code 558- EGR vacuum regulator circuit failure
     
    Code 565- Canister purge circuit failure
     
    Code 569- Canister purge 2 circuit failure
     
    Code 617- 1-2 shift error (E40D)
     
    Code 618- 2-3 shift error (E40D)
     
    Code 619- 3-4 shift error (E40D)
     
    Code 621- Shift solenoid 1 circuit failure
     
    Code 622- Shift solenoid 2 circuit failure
     
    Code 624- EPC solenoid or driver circuit failure
     
    Code 625- EPC driver open in ECA
     
    Code 626- Coast clutch solenoid circuit failure (E40D)
     
    Code 627- Converter clutch solenoid circuit failure (E40D)
     
    Code 628- Converter clutch error (E40D)
     
    Code 629- Converter clutch control circuit failure
     
    Code 631- Overdrive cancel indicator light circuit failure
     
    Code 632- Overdrive cancel switch not changing states (E40D)
     
    Code 633- 4WD switch is closed
     
    Code 634- MLP sensor voltage out ot self test range, A/C on
     
    Code 636- TOT sensor voltage out of self test range
     
    Code 637- TOT sensor circuit above maximum voltage
     
    Code 638- TOT sensor circuit below minimum voltage
     
    Code 654- MLP sensor not in park position
     
    Code 998- Hard fault present
     

     
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