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P0123 - Throttle Position (TP) Circuit High Input
The TP sensor circuit is monitored by the PCM for a high TP rotation angle (or voltage) input through the comprehensive component monitor (CCM). If during key ON engine OFF or key ON engine running the TP rotation angle (or voltage) changes above maximum calibrated limit, the test fails.
- TP sensor not seated properly
- TP circuit short to PWR
- TP circuit short to ETCREF
- SIG RTN circuit open to TP sensor
- Damaged TP sensor
- Damaged PCM
A TP PID (TP V PID) reading greater than 93% (4.65 volts) in key ON engine OFF, continuous memory or key ON engine running indicates a hard fault.
P0123 - ETC Throttle Position (TP1) sensor Circuit High Input
The ETC TP sensor 1 was flagged as fault status by the PCM indicating high voltage.
- ETC TP1 sensor harness shorted to VREF
- ETC TP1 sensor harness shorted to PWR
- Damaged TP1 sensor
- VREF circuit shorted to TP1 sensor
Drive vehicle, bring to a stop, turn key OFF. Start vehicle, run key ON engine running self-test at idle. Access KOER diagnostic trouble codes on scan tool.
P0193 - Fuel Rail Pressure Sensor Circuit High Input (FRP)
The comprehensive component monitor (CCM) monitors the FRP sensor circuit to the PCM for high voltage. If voltage were to fall below a calibrated limit and a calibrated amount of time during testing, the test will fail.
- FRP signal shorted to VREF or VPWR.
- FRP signal open (gasoline only)
- Low fuel pressure (NG only)
- Damaged FRP sensor.
- Damaged PCM.
- High fuel pressure (caused by damaged fuel pressure regulator) NG.
A FRP PID value during KOER or KOEO less than 0.3 volts for gasoline or 0.5 volts for natural gas vehicles (NG) would indicate a hard fault.
P0340 - Camshaft Position (CMP) Sensor Circuit Malfunction (Bank 1)
The test fails when the PCM can no longer detect the signal from the CMP sensor on Bank 1.
- CMP circuit open
- CMP circuit short to GND
- CMP circuit short to PWR
- SIG RTN open (VR sensor)
- CMP GND open (Hall effect sensor)
- CMP misinstalled (Hall effect sensor)
- Damaged CMP sensor shielding
- Damaged CMP sensor
- Damaged PCM
Harness routing, harness alterations, improper shielding, or electrical interference from other improperly functioning systems may have intermittent impact on the CMP signal.
TR Circuit Failure
TR circuits, indicating an invalid pattern in TR_D. Condition caused by a short to ground or an open in P/N, D, R, 2 or 1 circuits. Open in the taillamp ground circuit. This DTC can be set by an incorrectly adjusted TR sensor.
Increase in control pressure (harsh shifts). Defaults to D for an invalid position. MIL on.
Inspect the taillamp ground circuit. Go To Pinpoint Test C .