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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (63 - 68)
Chapter 4 52
TEST
CODE CONDITION FAULT CODE DEFINITION
63 O, C Throttle Position (TP) circuit fault, below
minimum voltage
63 C, O Fuel injection pump lever sensor input is
less than self test minimum (Diesel)
64 O, C ACT (IAT)/vane air temperature sensor
fault or circuit grounded
65 R Overdrive Cancel Switch not changing
state (E40D); transmission fault
65 R (Trucks ONLY): Charging system (1985
through 1988 models)
65 C (Cars ONLY): Fuel injector never went
closed loop
66 R, C (Cars ONLY): VAF/mass air flow sensor
fault, below minimum voltage
66 C (Trucks ONLY): MAF circuit below voltage
(4.0L models)
66 O, C TOT sensor signal input below self-test
minimum, or vane air flow circuit below
minimum (E4OD)
67 O Neutral Pressure Switch (NPS) circuit
failure, circuit open (3.0L MAP, 3.0L MAF-
SFI, 3.8L SFI)
67 C (Cars ONLY): Clutch switch circuit failure
67 C (Trucks ONLY): Air conditioning
compressor clutch switch fault
67 O, R (Cars ONLY): Neutral Drive Switch (NDS)
circuit failure, circuit open; or A/C input
high
67 O, C (Cars ONLY): Manual Lever Position
(MLP) sensor out of range; or A/C input
high (4.9L MAP, 5.8L MAP)
68 O, C (Cars ONLY): Vane air temperature circuit
grounded
68 O, R, C (Cars ONLY): Transmission temperature
switch circuit failure; circuit open
68 C (Trucks ONLY): Transmission oil
temperature over heat
4
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