DTC P1516, P2101, P2119 or P2176 (LFX, LFW)
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DTC P1516, P2101, P2119 or P2176 (LFX, LFW)
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DTC P1516
Throttle Actuator Control (TAC) Module Throttle Actuator Position Performance
DTC P2101
Throttle Actuator Position Performance
DTC P2119
Throttle Closed Position Performance
DTC P2176
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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High Resistance
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Open
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Short to Voltage
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Signal Performance
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TAC Motor Control Closed
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P1516, P2101, P2176
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P1516, P2101, P2176
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P1516, P2101, P2176
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P0690, P1516, P2101, P2176
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P1516, P2101, P2176
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TAC Motor Control Open
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P1516, P2101, P2176
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P1516, P2101, P2176
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P1516, P2101, P2176
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P1516, P2101, P2176
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P1516, P2101, P2176
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Circuit/System Description
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The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors throttle position sensors 1 and 2 (TP) to determine the actual throttle valve position.
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Conditions for Running the DTC
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P1516
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The ignition voltage is greater than 6 V and reduced power is not active.
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DTCs P1516 runs continuously when the above conditions are met.
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P2101
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The ECM has learned the minimum throttle position.
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The ignition voltage is greater than 6 V and reduced power is not active.
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DTCs P2101 run continuously when the above conditions are met.
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P2119
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DTCs P0121, P0122, P0123, P0222, P0223, P0641, P0651, P0697, P06A3, or P2135 are not set.
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The ignition voltage is greater than 6 V.
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DTC P2119 runs continuously when the above conditions are met.
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P2176
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DTCs P0068, P0122, P0123, P0222, P0223 are not set.
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The ignition voltage is greater than 6 V and reduced power is not active.
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DTC P2176 runs continuously when the above conditions are met.
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Conditions for Setting the DTC
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P1516
The ECM detect an inability to maintain a steady state throttle position for 4 s.
P2101
The ECM detects the difference between the actual throttle position, and the desired position is greater than 7 percent.
P2119
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The ECM detects that the throttle blade did not return to the default position, during power down, within a calibrated amount of time.
or
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The ECM detects the throttle control is driving the throttle in the incorrect direction or exceeds the reduced power limit.
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P2176
The ECM detects that both throttle position sensors were greater than 0.95 V during the minimum learn procedure.
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Action Taken When the DTC Sets
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DTCs P1516, P2101, and P2176 are type A DTCs.
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DTC P2119 is a type C DTC.
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Conditions for Clearing the MIL/DTC
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DTCs P1516, P2101, and P2176 are type A DTCs.
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DTC P2119 is a type C DTC.
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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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A high resistance condition on the throttle position and throttle actuator control circuits could cause a DTC to set.
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A low battery condition may cause a DTC to set.
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Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
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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Note
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A low battery voltage or charging system condition may cause a DTC to set.
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Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTCs P0121, P0122, P0123, P0222, P0223, P0562, P0621, P0622, or P2135 should not set.
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3.
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Clear the DTCs with a scan tool. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
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4.
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Ignition ON, observe the scan tool TAC Motor parameter. The reading should display Enabled.
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5.
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Check the DTC information with a diagnostic tool. DTC P1516, P2101, P2119, or P2176 should not be set.
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6.
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Note
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If there is a condition with the throttle body, the TAC Motor Command parameter will go to 99 % for a predetermined amount of time and then a DTC sets. Once a DTC is set, the TAC Motor Command parameter will go to 0 % and the TAC Motor parameter will display Disabled.
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Perform the scan tool Throttle Sweep Test while observing the TAC Motor parameter with a scan tool. The TAC Motor parameter should display Enabled while the Throttle Sweep Test is in progress.
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7.
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Note
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Before replacing the throttle body assembly, make sure the TAC motor control circuits are not shorted to B+.
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If not the specified value, replace the throttle body assembly.
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8.
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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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Warning
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Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.
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Ignition OFF, verify the following conditions do not exist with the Q38 throttle body assembly:
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A throttle blade that is not in the rest position
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A throttle blade that is binding open or closed
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A throttle blade that is free to move open or closed without spring pressure
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2.
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If a condition is found, replace the Q38 throttle body assembly.
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3.
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Note
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Disconnecting the throttle body harness connector may cause additional DTCs to set.
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Ignition OFF, disconnect the harness connector at the Q38 throttle body assembly.
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4.
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Ignition ON, verify that a test lamp does not illuminate between each motor control circuit listed below and ground.
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Motor control circuit terminal A
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Motor control circuit terminal B
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5.
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If test lamp illuminates, test the motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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6.
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Ignition ON, verify that a test lamp does not illuminate between each motor control circuit listed below and B+.
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Motor control circuit terminal A
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Motor control circuit terminal B
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7.
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If the test lamp illuminates, test the motor control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
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8.
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Ignition OFF, set the DMM to the 40 V scale, select the Min/Max Recording Mode, and set the Peak Min/Max response time to 1 ms.
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9.
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Note
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The DMM Min/Max Recording Mode and the response time of 1 ms must be reset after testing each circuit.
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The ignition must be OFF and the ECM completely powered down before testing each circuit.
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Ignition OFF, measure the voltage using the DMM Min/Max Recording Mode function on each circuit listed below as the ignition is turned ON. The Max voltage should be within 1 V of B+.
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Motor control circuit terminal A
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Motor control circuit terminal B
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10.
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If not within the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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11.
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If all circuits and connections test normal, replace the Q38 throttle body assembly.
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Perform the
Diagnostic Repair Verification
after completing the repair.
