Possible Causes
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.
Throttle Position (TP) sensor is a linear type sensor. The PCM determines 4 throttle operating conditions from the TP sensor signal; closed throttle (idle or deceleration), part throttle (cruise or moderate acceleration), wide open throttle (maximum acceleration or de-choke on crank), and throttle angle rate. Possible causes are:
- Binding or bent throttle linkage (P0121 or P1124).
- TP sensor not seated properly or tightened down (P0122, P0123, P1121 or P1124).
- Throttle plate less than closed throttle position (P1124).
- Throttle place/screw misadjusted (P1124).
- Damaged TP sensor (P0121, P0122, P0123, P1121 or P1124).
- Damaged PCM (P0122, P0123 or P1124).
- Air leak between MAF sensor and throttle body (P1121).
- Damaged MAF sensor (P1121).
- TP sensor loose pins (P1120).
- Intermittent open or short in TP sensor (P1125).
- Frayed wire (P1120).
- Corrosion on TP sensor, PCM or harness connectors (P1120).
- VREF harness opens or shorts to TP sensor (P0122 or P1120).
- Open TP SIG circuit or TP circuit open to PCM (P0121 or P0122).
- Open SIG RTN harness circuit (P0121 or P0123).
- TP circuit short to ground (P0122).
- TP circuit short to power (P0123).
- VREF short to power (P0123).
- VREF short to SIG RTN (P1120).
- Poor continuity through TP sensor connectors or harness (P1125).