Honda Civic Service Manual page 270

DTC Pl121: TP Sensor Signal Lower Than
Expected
1 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
2. Check the throttle position with the scan tool.
ls 12.9'/.,0.6 V, or higher indicated when the
throttle is tully opened?
YES- Intermittent failure, system is OK at this
t i m e . I
NO-Replace the TP sensor (the TP sensor is not
available separately). I
DTCP1122:.fP Sensor Signal Higher Than
Expected
1 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
2. Check the throttle position with the scan tool.
ls 12.9 %,0.6 V, or less indicated when the throttle
is f ully closed?
YES Intermittent failure, system is OK at this
t i m e . l
NO Replace the TP sensor (the TP sensor is not
available separately). I
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