DTC P0638, P1551, P2100-P2103, or P2119 (With Turbocharger)
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DTC P0638, P1551, P2100-P2103, or P2119 (With Turbocharger)
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DTC P0638
Throttle Actuator Control (TAC) Command Performance
DTC P1551
Throttle Valve Rest Position Not Reached During Learn
DTC P2100
Throttle Actuator Control (TAC) Motor Control Circuit
DTC P2101
Throttle Actuator Position Performance
DTC P2102
Throttle Actuator Control (TAC) Motor Control Circuit Low Voltage
DTC P2103
Throttle Actuator Control (TAC) Motor Control Circuit High Voltage
DTC P2119
Throttle Closed Position Performance
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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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Motor Control 1
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P2100, P2101, P2102
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P2100, P2101, P2119
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P2100, P2101, P2119
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P0123, P2101, P2103
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P0638, P1551, P2101, P2119
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Motor Control 2
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P2100, P2101, P2102, P2119
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P2100, P2101
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P2100, P2101, P2119
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P2101, P2103
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P0638, P1551, P2101, P2119
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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 the throttle position sensors 1 and 2 to determine the actual throttle valve position.
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Conditions for Running the DTCs
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P0638 and P2101
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The engine is operating.
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The ignition voltage is greater than 7.5 V.
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DTCs P0638 and P2101 run continuously once the above conditions are met for greater than 5 s.
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P1551
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DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0700, P2122, P2123, P2127, P2128, or P2138 are not set.
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The vehicle speed is 0 km/h (0 mph).
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The engine speed is less than 40 RPM.
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The accelerator pedal position (APP) is less than 15 percent.
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The engine coolant temperature (ECT) is greater than 5-100°C (41-212°F).
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The intake air temperature (IAT) is greater than 5°C (41°F).
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The ignition voltage is greater than 10 V.
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DTC P2119 runs once per ignition cycle when the above conditions are met for less than 1 s.
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P2100, P2102, and P2103
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The engine speed is greater than 80 RPM.
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The ignition voltage is between 10-18 V.
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DTC P2100 runs continuously once the above conditions are met.
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P2119
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DTCs P0111, P0112, P0113, P0116, P0117, P0118, P0119, P0700, P2122, P2123, P2127, P2128, or P2138 are not set.
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The vehicle speed is 0 km/h (0 mph).
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The engine speed is less than 250 RPM.
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The engine coolant temperature (ECT) is greater than 5°C (41°F).
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The intake air temperature (IAT) is greater than 5°C (41°F).
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The ignition voltage is greater than 8 V.
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DTC P2119 runs once per ignition cycle when the above conditions are met for less than 1 s.
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Conditions for Setting the DTC
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P0638
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The ECM detects that the commanded duty cycle for the range test high is greater than 80 percent.
OR
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The ECM detects that the commanded duty cycle for the range test low is greater than 80 percent.
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Either condition exists for greater than 5 second.
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P1551
The ECM detects the TP sensor angle is less than 2 percent or greater than 13 percent when the throttle actuator control motor is deactivated.
P2100
The ECM detects the output circuit for the TAC motor is open, shorted to ground, or shorted to a voltage. The condition exists for greater than 1 s.
P2101
The ECM detects a 4-50 percent difference between the commanded and the actual throttle plate position, dependant upon the rate of commanded throttle movement. The condition exists for 1 s.
P2102
The ECM detects an over heating or over current condition. The condition exists for 1 s.
P2103
The ECM detects a throttle actuator circuit that is shorted. The condition exists for 1 s.
P2119
The ECM determines that the throttle valve did not return to the rest position within 1 s.
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Action Taken When the DTC Sets
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DTCs P0638, P1551, P2100, P2101, P2102, P2103, and P2119 are type A DTCs.
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Conditions for Clearing the DTC
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DTCs P0638, P1551, P2100, P2101, P2102, P2103, and P2119 are type A DTCs.
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.
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
Special Tools
EL 34730-405
Injector Test Lamp
For equivalent regional tools, refer to
Special Tools
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Circuit/System Verification
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1.
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Ignition ON, observe the DTC information with a scan tool. Verify DTCs P0121, P0122, P0123, P0221, P0222, or P0223 are not set.
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3.
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Observe the scan tool Throttle Position Sensor voltage parameters. Verify that Throttle Position Sensor 1 voltage is between 3.24-3.54 V, and Throttle Position Sensor 2 voltage is between 1.36-1.86 V.
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5.
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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. DTC P0638, P2100, P2101, P2102, P2103 or P2119 are not set.
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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. DTC P0638, P2100, P2101, P2102, P2103 or P2119 are not set.
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9.
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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 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 Q38 throttle body.
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4.
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Ignition ON, test for 4.0-4.2 V between the TAC motor control 1 circuit terminal B and ground.
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5.
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If voltage is greater than the specified range, test each of the motor control circuits for a short to voltage. If the circuits tests normal, replace the K20 Engine Control Module.
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6.
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If voltage is less than the specified range, test the motor control 1 circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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7.
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Connect a test lamp between the TAC motor control 2 circuit terminal A and B+. The test lamp should NOT illuminate.
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8.
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If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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9.
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Test for greater than 3.5 V between TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A.
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10.
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If the voltage is less than the specified value, test the motor control 2 circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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11.
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Ignition OFF, connect the
EL 34730-405
Injector Test Lamp between the TAC motor control 1 circuit terminal B and TAC motor control 2 circuit terminal A of the throttle body harness connector. Observe the injector test lamp while turning the ignition ON for 5 s and then OFF. Verify the injector test lamp illuminates brightly and then turns OFF.
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12.
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If the injector test lamp does not illuminate, replace the K20 Engine Control Module.
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13.
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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.
