User Manual

Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (68 - 79)
53 Chapter 4
TEST
CODE CONDITION FAULT CODE DEFINITION
68 O (Trucks ONLY): Idle tracking switch (1985
through 1989 models)
69 O (Cars ONLY): AXOD 4/3 or 3/2 pressure
switch circuit failure; circuit closed
69 O (Trucks ONLY): Vehicle Speed Sensor fault
69 C AXOD 4/3 or 3/2 pressure switch circuit
failure, circuit open; or 3-4 shift error
(E4OD)
70 C (Cars ONLY): ECM failure
71 C (Cars ONLY): ECM reinitialization
detected on Cluster Control Assembly
(CCA) circuit failure
71 C Idle tracking switch closed on pre-position
72 C (Cars ONLY): System power circuit fault;
Message Center Control Assembly (MCCA)
circuit failure
72 R MAP, MAF or BP sensor out of range
during Dynamic Response Test
73 O (Cars ONLY): Insufficient throttle position
change
73 R (Cars ONLY): Throttle Position Sensor
fault / insufficient range
73 O, R (Trucks ONLY): Insufficient Throttle
Position change during Dynamic Response
Test
74 R Brake On/Off (BOO) switch fault; not
actuated
75 R Brake On/Off (BOO) switch fault / closed
circuit
76 R (Cars ONLY): Vane air flow sensor fault /
insufficient range during Dynamic
Response Test
77 R Operator error during Dynamic Response
Test / Wide Open Throttle not sensed
78 C (Trucks ONLY): Time delay relay fault
79 O (Cars ONLY): Air Conditioner "ON" during
Self-Test / defrost on
4