P1122

Steps 1 - 5:

Steps 6 - 10:

DTC P1122 TP Sensor Circuit Intermittent Low Voltage




Circuit Description
The throttle position (TP) sensor circuit provides voltage signal that changes relative to the throttle blade angle.The signal voltage will vary from about 0.6 volts at closed throttle to about 4.5 volts at wide open throttle (WOT).The TP signal is one of the most important inputs used by the powertrain control module (PCM) for fuel control and for most of the PCM controlled outputs. If the PCM detects a TP signal that is intermittently above the range of the TP sensor, DTC P1121 will be set.

Conditions for Setting the DTC
- The ignition is ON.
- TP sensor indicates a throttle position signal intermittently less than 0.22 volt for a total of 0.15 seconds over a 1.5-second period.

Action Taken When the DTC Sets
- The PCM will not illuminate the malfunction indicator lamp (MIL).
- The PCM will store conditions which were present when the DTC was set as Failure Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC
- A history DTC P1122 will clear after 40 consecutive warm-up cycles have occurred without a fault.
- DTC P1122 can be cleared by using the scan tool Clear Info function or by disconnecting the PCM battery feed.

Diagnostic Aids
Check for the following conditions:
- Poor connection at PCM - Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connection.
- The TP Sensor shares a 5 Volt reference with the EGR valve. If these codes are also set, it could indicate a problem with the 5 Volt reference circuit or components itself.
- The TP Sensor shares a ground with the EGR Valve and the IAT Sensor
- Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the throttle position display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the display will indicate the location of the fault.

Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help to determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.