DTC P1551, P2101, P2111, P2118, P2119, or P2176 (LLU)
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DTC P1551, P2101, P2111, P2118, P2119, or P2176 (LLU)
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DTC P1551 00
Throttle Valve Rest Position Not Reached During Learn
DTC P2101 00
Throttle Actuator Position Performance
DTC P2111 00
Throttle Actuator Control (TAC) Throttle Valve Stuck Open
DTC P2118 00
Throttle Actuator Control (TAC) Motor Current Performance
DTC P2119 00
Throttle Closed Position Performance
DTC P2176 00
Minimum Throttle Position Not Learned
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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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Control 1
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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Control 2
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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P1551 00, P2101 00, P2176 00
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Circuit/System Description
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The engine control module (ECM) is the control centre for the throttle actuator control (TAC) system. The ECM determines the intentions of the driver and then calculates throttle control. The ECM achieves throttle positioning by sending a pulse width modulated voltage to the throttle actuator motor. The throttle body (TAC) motor system uses the following circuits:
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Throttle body (TAC) motor control 1
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Throttle body (TAC) motor control 2
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Two processors are also used to monitor the throttle body (TAC) motor system data. Both processors are fitted in the ECM. Both processors monitor each other's data in order to verify that the desired throttle position is correct.
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Conditions for Running the DTC
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P1551 00, P2101 00, or P2119 00
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The ignition is ON or engine is running.
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The engine speed is less that 40 RPM.
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The vehicle speed is 0 km/h (0 MPH).
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The ignition voltage is greater than 8 V.
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The accelerator pedal position (APP) sensor is less than 15%.
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The engine coolant temperature (ECT) is greater than 5.3°C (41.5°F).
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The intake air temperature (IAT) is greater than 5.3°C (41.5°F).
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The system is not in battery safe mode.
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P2176 00
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The engine speed is less that 40 RPM.
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The vehicle speed is 0 km/h (0 MPH).
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The ECT is greater than 5.3°C (41.5°F).
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The IAT is greater than 5.3°C (41.5°F).
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The ignition voltage is greater than 10 V.
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The accelerator pedal position (APP) sensor is less than 15%.
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DTC P2176 00 run continuously when the above conditions are met.
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Conditions for Setting the DTC
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P1551 00 and P2101 00
The indicated throttle position does not match the predicted throttle position for more than 0.5 s.
P2111 00
The indicated throttle position does not match the predicted throttle position for more than 0.3 s.
P2118 00
The voltage of the power supply to the TAC motor is less than 4 V for 1 s.
P2119 00
The ECM determines that the throttle blade did not return to the rest position during power down, within a calibrated amount of time.
P2176 00
The difference between the predicted and the actual throttle position is more than a calibrated amount for more than 1.5 s.
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Action Taken When the DTC Sets
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DTCs P1551 00, P2101 00, P2111 00, P2118 00, P2119 00 and P2176 00 are Type C DTCs.
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The ECM commands the TAC system to operate in a reduced engine power mode.
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The service vehicle soon indicator may illuminate.
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Conditions for Clearing the DTC
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DTCs P1551 00, P2101 00, P2111 00, P2118 00, P2119 00 and P2176 00 are Type C DTCs.
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A high resistance condition with the throttle position sensor circuits may cause DTCs P1551 00, P2101 00, P2111 00, P2118 00, P2119 00, or P2176 00 to set.
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Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Throttle Actuator Control (TAC) System Description (LLU)
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, engine OFF, use a scan tool to observe the throttle position sensor 1 indicated position. Throttle position should increase as pedal is applied and decrease as pedal is released. When no accelerator pedal activity is detected, the throttle position will return to the spring loaded default position.
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2.
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Note
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A low voltage condition may set this DTC.
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Review the freeze frame/failure records and ensure sufficient ignition voltage was present when the DTC was set.
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3.
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Check with the vehicle owner that the battery has not been discharged if the voltage was low. If the battery has not been discharged, refer to
Deviation in Power Mode
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4.
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Drive the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you have noted from the freeze frame/failure records data.
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Note
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Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade may cause personal injury.
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1.
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Inspect the Q38 Throttle Body for the following conditions:
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A throttle blade that is not in the rest position
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A throttle valve that is binding open or closed
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A throttle valve that opens or closes without spring pressure
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2.
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If a condition is found, replace the Q38 Throttle Body.
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3.
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Note
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Disconnecting the throttle body harness connector causes additional DTCs to set.
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Ignition OFF, disconnect the harness connector at the Q38 Throttle Body.
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4.
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Ignition ON, verify that a test lamp does not illuminate between each motor control circuit terminal 1 and 4 and ground.
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5.
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If the test lamp illuminates, test the affected motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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6.
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Ignition ON, verify that a test lamp does not illuminate between each motor control circuit terminal 1 and 4 and B+.
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7.
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If test lamp illuminates, test the affected motor control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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8.
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Ignition ON, test for 3.5-4.7 V between the Motor control circuit terminal 4 and ground.
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9.
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If voltage is not within the specified range, test for an open or high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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10.
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Ignition ON, test for less than 1 V between the Motor control circuit terminal 1 and ground.
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11.
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If voltage is not within the specified range, test the motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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12.
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If all circuits test normal, replace the Q38 Throttle Body.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
