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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (42 - 55)
Chapter 4 50
TEST
CODE CONDITION FAULT CODE DEFINITION
42 C No O2S switching detected
43 C (Cars ONLY): Lean HEGO (HO2S) at wide
open throttle
43 R, C (Trucks ONLY): Throttle position sensor
below idle spec (Diesel)
44 R Thermactor air system fault
45 R Thermactor air upstream
45 C DIS coil pack circuit failure
46 R Thermactor air is not bypassed
46 C (Cars ONLY): DIS coil pack circuit failure
47 O 4 x 4 switch closed (E4OD)
47 R (Cars ONLY): Vane air flow low at idle
47 C Spark timing error
48 R (Cars ONLY): Vane Air flow high at idle
48 C (Cars ONLY): DIS coil pack circuit failure
/ left side
48 C Loss of ignition diagnostic monitor LH side
48 C Coil #3 circuit failure
49 C (Cars ONLY): SPOUT signal problem
49 C (Trucks ONLY): 1-2 shift error
51 O, C ECT sensor out of range indicated / circuit
open
52 O (Cars ONLY): PSPS (PSP) circuit open
52 R (Cars ONLY): PSPS (PSP) circuit out of
range
52 O, R (Trucks ONLY): Power steering pressure
switch open
53 O, C Throttle Position sensor above maximum
voltage
53 C, O Fuel injector pump lever sensor input is
greater than self test
54 O, C Intake Air charge temperature sensor
circuit open; vane air flow sensor out of
range
55 R (Cars ONLY): Open connection in ignition
key circuit
4
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