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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (55 - 62)
51 Chapter 4
TEST
CODE CONDITION FAULT CODE DEFINITION
55 R (Trucks ONLY): Charging system fault
56 O, C (Cars ONLY): Mass or vane air flow sensor
above maximum voltage transmission
sensor failure
56 C (Trucks ONLY): Mass Air Flow sensor
fault (voltage higher than normal) (4.0L
models)
56 O, C (Trucks ONLY): Transmission oil
temperature sensor fault (ex. 4.0L models)
57 O (Cars ONLY): Octane adjust circuit
grounded
57 C (Cars ONLY): AXOD Neutral Pressure
Switch (NPS) circuit fault; circuit open
58 O, C (Cars ONLY): Vane air control circuit
fault; circuit open
58 R (Trucks ONLY): Idle tracking switch
circuit fault
59 O (Cars ONLY): AXOD 4/3 pressure switch
circuit failure or idle adjust circuit
grounded (2.9L MAP)
59 O, C (Cars ONLY): AXOD 4/3 pressure switch
circuit failure or 2-3 shift error (E4OD)
59 O, C (Cars ONLY): Low speed fuel pump circuit
failure
59 C (Trucks ONLY): Transmission throttle
pressure switch circuit fault (1985 through
1988 models)
59 C (Trucks ONLY): 2-3 shift error (1989
models)
61 O, C Engine coolant temperature sensor fault or
circuit grounded
62 O (Cars ONLY): AXOD 4/3 or 3/2 pressure
switch circuit failure; circuit closed
62 C (Cars ONLY): Transmission clutch fault
(E4OD)
62 O, R (Trucks ONLY): Transmission 4/3 circuit
fault
4
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