Section 08 ENGINE MANAGEMENT (4-TEC)
Subsection 03 (DIAGNOSTIC PROCEDURES)
TPS “OUT OF RANGE” Fault
It is caused by the sensor reading going out of its allowable range. This fault can occur during the whole
range of movement of the throttle.
To diagnose this fully, it is recommended to operate the throttle through its full range. It is also recom-
mended to release the throttle quickly as this may also show up a fault that is intermittent.
POSSIBLE CAUSES RESULT ACTION
Check if connector is disconnected
from TPS.
Yes • Fix
Check if sensor is loose.
Yes
• Fix and reset
Closed Throttle and Idle
Actuator
Inspect sensor for damage or
corrosion.
Yes
• Replace and reset
Closed Throttle and
Idle Actuator
.
Inspect wiring (voltage test). Failed • Repair.
• If bad wiring, repair.Inspect wiring and sensor
(resistance test).
Failed
• If bad TPS, replace and reset
Closed
Throttle and Idle Actuator
.
Test sensor operation (wear test). Failed • Replace and reset
Closed Throttle and
Idle Actuator
.
TPS “ADAPTATION FAILURE” Fault
It is caused by the idle position moving out of an acceptable range.
Following failures can be effected by a TPS “Adaption Failure”:
– Idle speed is out of range.
– Engine stops, when throttle is released quickly.
– Engine runs inconsistent in low partload or low RPM.
POSSIBLE CAUSES RESULT ACTION
Sensor has been replaced and TPS
closed position not reset.
Yes
• Reset
Closed Throttle and Idle
Actuator
.
Throttle body has been replaced
and TPS closed position not reset.
Yes • Reset
Closed Throttle and Idle
Actuator
.
ECM has been replaced and TPS
closed position not reset.
Yes
• Reset
Closed Throttle and Idle
Actuator
.
Throttle cable too tight. Yes • Fix and reset
Closed Throttle and Idle
Actuator
.
Sensor is loose.
Yes
• Fix and reset
Closed Throttle and Idle
Actuator
.
Throttle bracket is loose. Yes
• Fix and reset
Closed Throttle and Idle
Actuator
.
Adjustment screw worn or loose. Yes
• Change throttle body.
446 smr2004-Complete Line Up
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