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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls - DTCS P0016 To P0121, Diagnostic Code Index, Pre Diagnostic Troubleshooting Procedure & Intermittent Condition) >> Electrical Diagnostics >> Diagnosis And Testing >> P0121-Throttle Position Sensor 1 Performance >> Possible Causes

Possible Causes

WARNING: This page is about a different car, the 2006 Dodge Magnum, 2006 Dodge Charger, and 2006 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
Possible Causes 
RESISTANCE IN THE (K22) TP SENSOR NO.1 OR (K122) TP SENSOR NO.2 SIGNAL CIRCUIT
RESISTANCE IN (F855) 5-VOLT SUPPLY CIRCUIT
RESISTANCE IN THE (K922) SENSOR RETURN CIRCUIT
(K22) TP SENSOR NO.1 SIGNAL CIRCUIT SHORTED TO (K122) TP SENSOR NO.2 SIGNAL CIRCUIT
THROTTLE POSITION SENSOR/THROTTLE BODY
PCM

Always perform the  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   before proceeding.