B4000 2WD V6-4.0L OHV (1994)
EEC-IV, OBD I, Codes 124 and 125 are a result of the given air flow and the TPS sensor signal (throttle plate position).
These codes are designed to set while in the part throttle drive mode and often are accompanied by the MIL light flashing until the condition is corrected.
NOTE:
Duplication may be difficult for the following reasons:
^
Long drive time required for the PCM to calculate the error in the system.
^
Source of the problem may be intermittent.
Refer to the workshop to identify the root causes of these codes and the appropriate repair procedure.
EEC-IV OBD I Diagnostic Trouble Codes 122 and 123
EEC-IV OBD I DIAGNOSTIC TROUBLE CODES 122 AND 123
TROUBLESHOOTING TIPS
The following are Symptoms which have been associated with TPS concerns but may also be related to other vehicle components:
^
"Check Engine Light" Illumination
^
Engine Stall / Quit Running
^
Hesitation / Stumble
^
Fast Idle
If the EEC trouble code indicates the TPS may be the source, perform the pin-point test described in the workshop manual in conjunction with the
procedure below.
TESTING THE TPS
The TPS is supplied with a 5.0 volt reference signal. As the TPS senses throttle plate rotation, the output voltage changes to a value ranging from 0.4 to
4.8 volts depending on the vehicle application.
