DTC P1516, P2100-P2103, P2119, or P2176 - LDE
Diagnostic Instructions
DTC Descriptor
DTC P1516 00: Throttle Actuator Control
(TAC) Module Throttle Actuator Position Performance
DTC P2100 00: Throttle Actuator Control
(TAC) Motor Control Circuit
DTC P2101 00: Throttle Actuator Position
Performance
DTC P2102 00: Throttle Actuator
Control (TAC) Motor Control Circuit Low Voltage
DTC P2103 00: Throttle Actuator
Control (TAC) Motor Control Circuit High Voltage
DTC P2119 00: Throttle Closed Position
Performance
DTC P2176 00: Minimum Throttle Position Not
Learned
Diagnostic Fault Information
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
|
Motor Control 1
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00, P1104 00
|
|
Motor Control 2
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00
|
P1516 00, P2101 00, P2176 00, P1104 00
|
Circuit/System Description
The engine control module (ECM) is the control centre for the
throttle body throttle actuator control (TAC) system. The ECM
determines the drivers intent and then calculates the appropriate
throttle response. The ECM achieves throttle positioning by
providing a pulse width modulated voltage to the throttle
body (TAC) motor. The throttle body (TAC) motor system
uses the following circuits:
| • |
Throttle body (TAC) motor control 1 |
| • |
Throttle body (TAC) motor control 2 |
Two processors are also used to monitor the throttle
body (TAC) motor system data. Both processors are located
within the ECM. Both processors monitor each others data to verify
that the indicated throttle position is correct.
Conditions for Running the DTC
P1516 00 or P2101 00
| • |
The ignition is ON or the engine is
operating. |
| • |
The ignition voltage is greater than
7 V. |
| • |
The system is not in battery safe mode. |
| • |
DTC P0068 00 is not set. |
| • |
DTCs P1516 00 and P2101 00 run
continuously once the above conditions are met for greater than
5 seconds. |
P2100 00, P2102 00, or P2103 00
| • |
The ignition is ON or the engine is
operating. |
| • |
The ignition voltage is greater than
7 V. |
| • |
The system is not in battery safe mode. |
| • |
DTC P0068 00 is not set. |
| • |
DTCs P2100 00, P2102 00, and
P2103 00 run continuously once the above conditions are
met. |
P2119 00
| • |
DTCs P0121 00, P0122 00,
P0123 00, P0222 00, P0223 00, P0641 00,
P0651 00, P0697 00, P06A3 00, or P2135 00 are
not set. |
| • |
The ignition voltage is greater than
6 V. |
| • |
DTC P2119 00 runs when the ignition is
turned to the OFF position, when the above conditions are met. |
P2176 00
| • |
The ignition voltage is greater than
6 V. |
| • |
The system is not in battery safe mode |
| • |
DTCs P0068 00, P0120 00,
P0122 00, P0123 00, P0220 00, P0222 00,
P0223 00 are not set. |
| • |
DTC P2176 00 run continuously when the
above conditions are met. |
Conditions for Setting the DTC
P1516 00
The indicated throttle position does not match the predicted
throttle position for more than 0.5 second.
P2100 00
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 second.
P2101 00
The indicated throttle position does not match the predicted
throttle position for more than 0.3 second.
P2102 00
The ECM detects an over heating or over current condition. The
condition exists for 1 second.
P2103 00
The ECM detects a throttle actuator circuit that is shorted. The
condition exists for 1 second.
P2119 00
The ECM determines that the throttle blade did not return to the
rest position within 720 ms.
P2176 00
The difference between the predicted and the actual throttle
position is more than a calibrated amount for more than
1.5 seconds.
Action Taken When the DTC Sets
| • |
DTCs P1516 00, P2101 00, and
P2176 00 are Type B DTCs. |
| • |
DTC P2119 00 is a Type C DTC. |
Conditions for Clearing the DTC
| • |
DTCs P1516 00, P2100 00,
P2101 00, P2102 00, P2103 00, and P2176 00 are
Type B DTCs. |
| • |
DTC P2119 00 is a Type C DTC. |
Diagnostic Aids
| • |
A high resistance condition with the throttle
position sensor circuits may cause DTCs P151 006,
P2100 00, P2101 00, P2102 00, P2103 00,
P2119 00, or P2176 00 to set. |
| • |
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. |
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- 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.
Note: A low voltage condition
may set this DTC.
- Review the freeze frame/failure records and ensure
sufficient ignition voltage was present when the DTC was set.
| ⇒ |
If voltage was low, verify with the owner that the
battery was not discharged. If the battery has not been discharged,
refer to
Power Mode Mismatch |
- Operate the vehicle within the conditions for running
the DTC. You may also operate the vehicle within the conditions
that you observed from the freeze frame/failure records data.
Circuit/System Testing
- Inspect the Q38 Throttle Body for the following
conditions:
| • |
A throttle blade that is not in the rest
position |
| • |
A throttle valve that is binding open or
closed |
| • |
A throttle valve that opens or closes without
spring pressure |
| ⇒ |
If a condition is found, replace the
Q38 Throttle Body. |
Note: Disconnecting the
throttle body harness connector causes additional DTCs to
set.
- Ignition OFF, disconnect the harness connector of the
Q38 Throttle Body.
- Ignition ON, test for greater than 9 V on the
Q38 Throttle Body motor control 1 circuit terminal A
and Q38 Throttle Body motor control 2 circuit
terminal B.
| ⇒ |
If less than the specified range, test the
appropriate Q38 Throttle Body motor control circuit for a
short to ground, or an open/high resistance. If the circuit tests
normal, replace the K20 Engine Control Module. |
- Ignition ON, probe the Q38 Throttle Body motor
control 1 circuit terminal A and Q38 Throttle Body
motor control 2 circuit terminal B with a test lamp
connected to ground. Verify the test lamp does not illuminate.
| ⇒ |
If the test lamp illuminates, test the appropriate
Q38 Throttle Body motor control circuit for a short to
voltage. If the circuit tests normal, replace the K20 Engine
Control Module. |
- Set the DMM to Alternating Current (AC) Hz on the
400 mV scale. Engine idling, test for greater than 2000 AC hz
between the Q38 Throttle Body motor control circuits listed
below and ground while commanding the Engine Speed to
1 950 RPM with a scan tool.
| • |
Motor control 1 circuit terminal A |
| • |
Motor control 2 circuit terminal B |
| ⇒ |
If less than the specified value, replace the
K20 Engine Control Module. |
- If all circuits test normal, replace the
Q38 Throttle Body.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
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