Retrieving codes – Equus 3145 - Digital Ford Code Reader (1981 - 1995) User Manual
Page 52
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