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