P0122

Diagnostic Chart 1 Of 2:

Diagnostic Chart 2 Of 2:

Schematic:

CIRCUIT DESCRIPTION
The throttle position (TP) sensor circuit provides a voltage signal that changes relative to the throttle blade angle. The signal voltage will vary from less than 1.0 volt at closed throttle to more than 4.0 volts at Wide Open Throttle (WOT). The PCM monitors the throttle position and compares the actual throttle position from the TP sensor to a predicted TP value that is calculated from the engine speed. If the PCM detects an excessively low TP sensor signal voltage, DTC P0122 will be set.

CONDITIONS FOR RUNNING THE DTC
The engine is running.

CONDITIONS FOR SETTING THE DTC
^ The TP sensor signal voltage is less than 0.1 volt.
^ The above conditions are present for longer than 1 second.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM will illuminate the MIL during the first trip in which the diagnostic test has been run and failed.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using the scan tool.

DIAGNOSTIC AIDS
Check for the following conditions:
^ A poor connection at the PCM and the TP sensor
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal-to-wire connection. Use a corresponding mating terminal to test for proper terminal tension.
^ A damaged harness
Inspect the wiring harness for damage. If the harness appears to be OK, observe the TP Sensor display on the scan tool while moving the connectors and the wiring harnesses that are related to the sensor. A change in the display will indicate the location of the fault. Refer to Wiring Repairs in Diagrams.

If DTC P0122 cannot be duplicated, the information included in the Failure Records data can be useful in determining the vehicle mileage since the DTC was last set. If it is determined that the DTC occurs intermittently, reviewing the DTC P1122 Throttle Position (TP) Sensor Circuit Intermittent Low Voltage Diagnostic Chart may isolate the cause of the malfunction. P1122

TEST DESCRIPTION
Number(s) below refer to the step number(s) on the Diagnostic Table:
11. This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to PCM Replacement and Programming Procedures in Powertrain Control Module (PCM) and Sensors.