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Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (89 - 112)
55 Chapter 4
TEST
CODE CONDITION FAULT CODE DEFINITION
89 O Exhaust heat control
91 O Shift Solenoid 1 (SS1) circuit failure
91 R (Cars ONLY): HEGO (HO2S) sensor
voltage low / system lean
91 C (Cars ONLY): HEGO (HO2S) sensor signal
out of range /always lean
92 O Shift Solenoid 2 (SS2) circuit failure
92 R (Cars ONLY): HEGO (HO2S) sensor
voltage high / system rich
93 O (Cars ONLY): Throttle position sensor
signal input low at maximum DC motor
extension or Converter Clutch Control
(CCC) circuit failure
93 O (Trucks ONLY): Coast clutch circuit failure
94 O Converter Clutch Control (CCC) circuit
failure
94 R (Cars ONLY): Air diverter solenoid circuit
fault
95 O, C Fuel pump secondary circuit fault
96 O, C Fuel pump secondary circuit fault / high
speed fuel pump relay open
97 O Overdrive Cancel Indicator Light (OCIL)
circuit failure
98 O Electronic Pressure Control (EPC) driver
failure in processor
98 R (Cars ONLY): Hard fault is present -
FMEM mode
98 R (Trucks ONLY): Test failure, hard fault
repeat sequence (1985 through 1988)
99 O, C Electronic Pressure Control (EPC) circuit
failure
99 R (Cars ONLY): EEC system has not learned
to control idle
111 O, R, C System PASS
112 O, C (Cars ONLY): Intake Air Temperature
(IAT) sensor circuit below minimum voltage
/ 254°F indicated
4
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