B4000 2WD V6-4.0L OHV (1994)
IMPORTANT NOTE:
To minimize replacement of GOOD components, the following NON-EEC areas may be mistaken for issues causing customer complaints.
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Excessive Blow-by
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PVC Malfunction
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Vacuum Leaks
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Fuel Pressure
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Throttle Sticking or Linkage Binding
NOTE:
EEC codes for the TPS are intended as a supplemental aid in diagnosing problems. These do not indicate the root cause since more than one
component can set the code.
Description of EEC-IV DTC Code 121, 124 or 125
DESCRIPTION of EEC-IV DTC CODE 121, 124 or 125
When DTCs 121, 124 or 125 are set in continuous memory, the technician is directed to the workshop manual. In addition to workshop manual
procedures, the technician should refer to the diagnostic instructions supplied below.
This "In-Range" self test identifies in-range concerns of the following components.
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MAF Sensor
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TPS
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Fuel Delivery System
The PCM uses information from these components and the vehicle load to generate three (3) independent values. These values are continuously
monitored by the PCM. If, during normal driving conditions, one of the three values differs significantly from the others, a Continuous Memory
Diagnostics Trouble Code (DTC) is stored.
