DTC P0121-P0123 or P0221-P0223 (With Turbocharger)
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DTC P0121-P0123 or P0221-P0223 (With Turbocharger)
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DTC P0121
Throttle Position Sensor 1 Performance
DTC P0122
Throttle Position Sensor 1 Circuit Low Voltage
DTC P0123
Throttle Position Sensor 1 Circuit High Voltage
DTC P0221
Throttle Position Sensor 2 Performance
DTC P0222
Throttle Position Sensor 2 Circuit Low Voltage
DTC P0223
Throttle Position Sensor 2 Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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5-Volt Reference
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P0122, P0222, P0698
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P0121, P0122, P0221, P0222, P0697, P2119, P2101
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P0123, P0223, P0699, P2101, P2119
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P0121, P0221, P0697, P0698, P0699
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TP Sensor Signal 1
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P0122
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P0121, P0122, P2101, P2119
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P0123
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P0121, P0221, P2119
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TP Sensor Signal 2
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P0222
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P0221, P0223
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P0223, P0638, P2128, P2138
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P0221
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Low Reference
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-
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P0121, P0123, P0221, P0223, P2119, P2100
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P0123, P0223*
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P0121, P0221
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* Internal ECM or TP sensor damage may occur if the circuit is shorted to B+
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TP Sensor
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
The engine is operating in closed loop
Parameter Normal Range:
TP Position Sensor 5%/4.2 V
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5-Volt Reference
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124%/0.0 V
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7%/0.0 V
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113%/TP 1 4.98, TP 2, 4.50 V
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TP Sensor Signal 1
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4%/0.00 V
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7%/0.00 V
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7%/0.00 V
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TP Sensor Signal 2
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4%/0.00 V
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4%/4.98 V
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27%/4.98 V
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Low Reference
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-
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0%/4.98 V
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-
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Circuit/System Description
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The throttle body assembly contains 2 throttle position (TP) sensors. The TP sensors are mounted to the throttle body assembly and are not serviceable. The TP sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the TP sensors with a common 5-volt reference circuit , a common low reference circuit, and two independent signal circuits. The TP sensors have opposite functionality . TP sensor 1 signal voltage decreases from greater than 4 volts at idle to less than 1 volt at wide open throttle (WOT). TP sensor 2 signal voltage increases from less than 1 volt at idle to greater than 4 volts at WOT.
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Conditions for Running the DTC
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The ignition is ON, with the engine OFF, or the engine is operating.
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The ignition voltage is greater than 7 volts.
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DTCs run continuously once the above conditions are met.
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Conditions for Setting the DTC
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P0121
The TP sensor 1 disagrees greater than 9 percent from TP sensor 2, or TP sensor 1 disagrees greater than 9 percent from the predicted value for greater than 2 seconds.
P0122
The ECM detects the TP sensor 1 signal voltage is less than 0.18 volt for greater than 2 seconds.
P0123
The ECM detects the TP sensor 1 signal voltage is greater than 4.6 volts for greater than 2 seconds.
P0221
The TP sensor 2 disagrees greater than 9 percent from TP sensor 1, or TP sensor 2 disagrees greater than 9 percent from the predicted value for greater than 2 seconds.
P0222
The ECM detects the TP sensor 2 signal voltage is less than 0.16 volt for greater than 2 seconds.
P0223
The ECM detects the TP sensor 2 signal voltage is greater than 4.9 volts for greater than 2 seconds.
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Action Taken When the DTC Sets
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DTCs P0121 and P0221 are type B DTCs.
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DTCs P0122, P0123, P0222, and P0223 are type A DTCs.
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Conditions for Clearing the DTC
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DTCs P0121 and P0221 are type B DTCs.
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DTCs P0122, P0123, P0222, and P0223 are type A DTCs.
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If there is a condition with the TP sensors the ECM defaults to reduced power mode for the entire ignition cycle, even if the condition is corrected.
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Throttle Actuator Control (TAC) System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Ignition ON, verify that DTC P0697, P0698, or P0699 is not set.
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3.
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Clear the DTC Info with a scan tool.
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4.
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Start the engine, observe the scan tool TP Sensor 1 and 2 voltage parameters. TP sensor 1 should be between 0.17-4.6 V and TP sensor 2 should be between 0.15-4.8 V.
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5.
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Observe the scan tool TP sensor 1 and 2 parameters while performing the tests listed below. The TP sensor 1 and 2 parameter should display Agree.
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Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times.
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Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times.
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6.
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Check the DTC Info with a scan tool. DTC P0121, P0122, P0123, P0221, P0222 and P0223 are not set.
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7.
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Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF, disconnect the harness connector at Q38 throttle body.
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2.
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Ignition OFF, remove the fuse that supplies B+ to terminal 56 X2 of the K20 ECM.
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3.
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Note
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The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.
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Test for less than 5 Ω between the low reference circuit terminal C and ground.
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4.
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If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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5.
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Install fuse that supplies B+ to terminal 56 X2 of the K20 ECM.
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6.
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Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminal E and ground.
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7.
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If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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8.
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If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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9.
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Ignition ON, verify that the scan tool TP sensor 1 voltage parameter is less than 0.3 V.
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10.
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If greater than the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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11.
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Connect a 3 A fused jumper wire between the 5 volt reference circuit terminal E and the TP sensor 1 signal circuit terminal D. Verify the scan tool TP sensor 1 voltage parameter is greater than 4.89 V.
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12.
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If less than the specified value, test the signal circuit for an open/high resistance or for a short to ground. If the circuit tests normal, replace the K20 ECM.
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13.
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Verify the scan tool TP sensor 2 voltage parameter is greater than 4.97 V.
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14.
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If less than the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the K20 ECM.
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15.
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Note
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If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage.
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Connect a 3 A fused jumper wire between the TP sensor 2 signal circuit terminal F and the low reference circuit terminal C. Verify the scan tool TP sensor 2 voltage parameter is less than 0.10 V.
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16.
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If greater than the specified value, test the signal circuit for an open/high resistance or for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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17.
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If all circuits test normal, replace the Q38 throttle body assembly.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
