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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (34 - 42)
49 Chapter 4
TEST
CODE CONDITION FAULT CODE DEFINITION
34 R (Cars ONLY): EGR valve not opening
properly
34 O, R, C (Cars ONLY): Insufficient EGR flow or
EVP voltage high (SONIC) or PFE sensor
voltage high or out of specification
34 O, R, C (Trucks ONLY): EGR control circuit fault
(ex. V8 models)
34 O, R, C (Trucks ONLY): EVAP control system
fault / voltage higher than closed limit (V8
models)
34 C, O, R Defective EGR pressure transducer sensor
35 R (Cars ONLY): RPM too low for EGR test
(2.3L MAP)
35 O, R, C (Cars ONLY): EVP/PFE voltage high
35 O, R, C (Trucks ONLY): No EGE position signal,
RPM low
35 O, R, C (Trucks ONLY): EVAP control system fault
(V8 models)
36 R System indicates lean at idle
36 R Insufficient RPM increase during speed
control test
37 R System indicates rich at idle
37 R Insufficient RPM increase during speed
control test
38 C DC motor idle speed control / idle tracking
throttle position sensor open circuit
39 C (Cars ONLY): Automatic overdrive not
operating properly (transmission failure)
41 R HEGO (HO2S) sensor voltage low / system
lean
41 C HEGO (HO2S) sensor signal out of range /
always lean
41 C No HO2S switching detected
42 R HEGO (HO2S) sensor voltage high / system
rich
42 C (Cars ONLY): HEGO (HO2S) sensor signal
out of range / always rich
4
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