Loading ...
Loading ...
Loading ...
Retrieving Codes
FAULT CODE DEFINITIONS FOR EEC-IV SYSTEMS (25 - 33)
Chapter 4 48
TEST
CODE CONDITION FAULT CODE DEFINITION
25 R Knock not sensed during Dynamic
Response Test
26 O, R (Cars ONLY): Mass Air Flow (MAF) sensor
or Vane Air Flow (VAF) sensor or
Transmission Oil Temperature (TOT)
sensor out of range
26 O, R (Trucks ONLY): MAF sensor or circuit
fault (4.0L models)
26 O, R (Trucks ONLY): Transmission oil
temperature sensor fault (ex. 4.0L)
27 C (Cars ONLY): Vehicle speed sensor or
EDIS fault
27 C Coil #2 primary circuit failure
28 O, R (Cars ONLY): Vane Air Temperature
(VAT) sensor; EDIS or DIS fault
28 C Loss of primary tachometer (IDM), right
side
29 C Insufficient input from the Vehicle Speed
Sensor (VSS)
29 C Insufficient input from programmable
speedometer/odometer module
31 O, R, C (Cars ONLY): EVP or PFE circuit below
minimum voltage
31 O, R, C (Trucks ONLY): EGR valve control sensor
fault (ex. V8 models)
31 O, R (Trucks ONLY): EVAP control system
below minimum voltage
32 R (Cars ONLY): EGR valve control system
signal out of specification
32 R, C (Cars ONLY): EGR valve not seated
32 R, C (Trucks ONLY): EGR pressure feedback
fault (1985-89 models)
32 O, R, C (Cars ONLY): EVP voltage low (SONIC) or
EPT circuit voltage low (PFE)
33 R, C (Cars ONLY): EGR valve not opening
properly
33 R, C (Trucks ONLY): EGR valve fault / not
closing properly / TPS fault (Diesel)
4
Loading ...
Loading ...
Loading ...