DTC P0121-P0123, P0221-P0223, or P2135 (LLU)
|
|
DTC P0121-P0123, P0221-P0223, or P2135 (LLU)
|
DTC P0121 00
Throttle Position Sensor 1 Performance
DTC P0122 00
Throttle Position Sensor Circuit Low Voltage
DTC P0123 00
Throttle Position Sensor Circuit High Voltage
DTC P0221 00
Throttle Position Sensor 2 Performance
DTC P0222 00
Throttle Position Sensor 2 Circuit Low Voltage
DTC P0223 00
Throttle Position Sensor 2 Circuit High Voltage
DTC P2135 00
Throttle Position Sensors 1-2 Not Plausible
|
Diagnostic Fault Information
|
|
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5V Reference
|
-
|
P0122 00, P0222 00
|
P0223 00, P2135 00
|
-
|
Throttle Position Sensor 1 Signal
|
P0122 00
|
P0122 00, P2119 00, P2135 00, P2176 00
|
P0223 00, P2135 00
|
P2135 00
|
Throttle Position Sensor 2 Signal
|
P0222 00
|
P0223 00, P2135 00
|
P0223 00, P2135 00
|
P2135 00
|
Low Reference
|
-
|
P0123 00, P0223 00
|
-
|
-
|
Throttle Position Sensor 1
|
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions:
Engine running
Parameter Normal Range:
Throttle position sensor 1 0.20-4.82 V
|
5V Reference
|
0 V
|
0 V
|
5 V
|
Throttle Position Sensor 1 Signal
|
0 V
|
0 V
|
5 V
|
Low Reference
|
-
|
4.98 V
|
-
|
Throttle Position Sensor 2
|
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions:
Engine running
Parameter Normal Range:
Throttle position sensor 2 (4.82-0.19 V)
|
5V Reference
|
0.02 V
|
0 V
|
5 V
|
Throttle Position Sensor 2 Signal
|
0 V
|
5 V
|
5 V
|
Low Reference
|
-
|
5 V
|
-
|
|
Circuit/System Description
|
The throttle body assembly contains 2 throttle position sensors. The throttle position sensors are mounted to the throttle body assembly and are not serviceable. The throttle position sensors provide a signal voltage that changes relative to throttle blade angle. The engine control module (ECM) supplies the throttle position sensors with a common 5 V reference circuit, a common low reference circuit, and 2 independent signal circuits.
The throttle position sensors have opposite functionality. Throttle position sensor 1 signal voltage decreases and throttle position sensor 2 signal voltage increases as the accelerator pedal increases to wide open throttle (WOT).
|
Conditions for Running the DTC
|
P0121 00
|
•
|
DTCs P0102 00, P0103 00, P0112 00, P0113 00, P0117 00, P0118 00, P0335 00, or P0336 00 are not set.
|
|
•
|
The engine speed is between 400-6 500 RPM.
|
|
•
|
The engine coolant temperature (ECT) is between 70-125°C (158-257°F).
|
|
•
|
The intake air temperature (IAT) is between -20 to +125°C (-4 to +257°F).
|
|
•
|
The DTC runs continuously when the above conditions are met.
|
P0122 00, P0123 00, P0222 00, P0223 00
|
•
|
The ignition is ON or the engine is running.
|
|
•
|
The engine is not operating in reduced power mode.
|
|
•
|
The ignition voltage is greater than 6 V.
|
|
•
|
The DTCs runs continuously when the above condition is met.
|
P2135 00
|
•
|
DTCs P0122 00, P0123 00, P0222 00, or P0223 00 are not set.
|
|
•
|
The ignition is ON or the engine is running.
|
|
•
|
The engine is not operating in reduced power mode.
|
|
•
|
The ignition voltage is greater than 6 V.
|
|
•
|
The DTCs runs continuously when the above condition is met.
|
|
Conditions for Setting the DTC
|
P0121 00
The ECM detects that the throttle position sensor 1 voltage is stuck in range for less than 1 s.
P0122 00
The ECM detects that the throttle position sensor 1 voltage is less than 0.17 V for more than 0.4 s.
P0123 00
The ECM detects that the throttle position sensor 1 voltage is more than 4.62 V for more than 0.4 s.
P0221 00
The throttle position sensor 2 disagrees greater than 9% from throttle position sensor 1, or throttle position sensor 2 disagrees greater than 9% from the predicted value for greater than 1 s or a cumulative of 10 s.
P0222 00
The ECM detects that the throttle position sensor 2 voltage is less than 0.16 V for more than 0.4 s.
P0223 00
The ECM detects that the throttle position sensor 2 voltage is more than 4.88 V for more than 0.4 s.
P2135 00
The difference between the throttle position sensor 1 and throttle position sensor 2 exceeds a predetermined value for more than 2 s.
|
Action Taken When the DTC Sets
|
P0122 00, P0123 00, P0221 00, P0222 00, P0223 00, or P2135 00
|
•
|
DTC P0122 00, P0123 00, P0222 00, P0223 00, and P2135 00 are Type C DTCs.
|
|
•
|
The ECM commands the throttle actuator control (TAC) system to operate in a reduced engine power mode.
|
|
•
|
The service vehicle soon indicator will illuminate.
|
P0121 00
|
•
|
DTC P0121 00 is a Type C DTC.
|
|
•
|
The ECM commands the throttle actuator control (TAC) system to operate in a reduced engine power mode.
|
|
•
|
The service vehicle soon indicator will illuminate.
|
|
Conditions for Clearing the DTC
|
|
•
|
DTC P0122 00, P0123 00, P0222 00, P0223 00, and P2135 00 are Type C DTCs.
|
|
•
|
DTC P0121 00 is a Type C DTC.
|
|
•
|
It may be necessary to disconnect the battery to clear DTC P2135 00.
|
|
•
|
A high resistance condition on the throttle actuator control circuits may cause a DTC to set.
|
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
|
Circuit/System Verification
|
|
1.
|
Ignition ON, observe the throttle position sensor 1 parameter. The reading should be between 0.18 V and 4.63 V and change with accelerator pedal position.
|
|
2.
|
Ignition ON, observe the Throttle Position Sensor 2 parameter. The reading should be between 4.7-0.13 V and change with accelerator pedal input.
|
|
3.
|
Check the DTC Info with a scan tool. DTCs P0121 00, P0122 00, P0123 00, P0221 00, P0222 00, P0223 00, and P2135 00 should not be generated.
|
|
4.
|
Observe throttle position sensor 1 and throttle position sensor 2 percent parameters while you quickly press the accelerator pedal from closed throttle position to wide open throttle. Both throttle position sensor 1 and throttle position sensor 2 percent parameters should change.
|
|
5.
|
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.
|
|
Note
|
|
You must perform the circuit/system verification before proceeding with circuit/system testing.
|
|
1.
|
Ignition OFF, disconnect the harness connector at the Q38 Throttle Body. Allow sufficient time for the K20 Engine Control Module to completely power down.
|
|
2.
|
Ignition OFF, test for less than 5 Ω between the Q38 Throttle Body harness connector low reference circuit terminal 2 and ground.
|
|
3.
|
If greater than 5 Ω, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
4.
|
Ignition ON, test for 4.8-5.2 V between the Q38 Throttle Body harness connector 5 V reference circuit terminal 3 and ground.
|
|
5.
|
If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
6.
|
If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
7.
|
Test for less than 0.3 V between the Q38 Throttle Body harness connector throttle position sensor 1 signal circuit terminal 6 and ground.
|
|
8.
|
If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
9.
|
Test for less than 0.3 V between the Q38 Throttle Body harness connector throttle position sensor 2 signal circuit terminal 5 and ground.
|
|
10.
|
If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
11.
|
Install a 3 A fused jumper wire between Q38 Throttle Body harness connector throttle position sensor 1 signal circuit terminal 6 and the 5 V reference circuit terminal 3. Verify the scan tool Throttle Position Sensor 1 voltage parameter is greater than 4.8 V.
|
|
12.
|
If less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
13.
|
Install a 3 A fused jumper wire between Q38 Throttle Body harness connector throttle position sensor 2 signal circuit terminal 5 and the low reference circuit terminal 2. Verify the scan tool Throttle Position Sensor 2 voltage parameter is less than 0.1 V.
|
|
14.
|
If greater than the specified range, test the signal circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
|
|
15.
|
Ignition OFF, disconnect the ECM X1 harness connector at the K20 Engine Control Module.
|
|
16.
|
Test for less than 5 Ω on all Q38 Throttle Body harness connector throttle position sensor circuits between the following terminals:
|
|
|
•
|
The 5 V reference circuit terminal 3 to the corresponding ECM terminal X1-10.
|
|
|
•
|
The throttle position sensor 2 signal circuit terminal 5 to the corresponding ECM terminal X1-22
|
|
|
•
|
The throttle position sensor 1 signal circuit terminal 6 to the corresponding ECM terminal X1-42
|
|
|
•
|
If greater than 5 Ω, repair the affected circuit.
|
|
17.
|
Test for infinite resistance between Q38 Throttle Body throttle position sensor 1 signal circuit terminal 6 and throttle position sensor 2 signal circuit terminal 5.
|
|
18.
|
If less than infinite resistance, repair the short between Q38 Throttle Body throttle position sensor 1 signal circuit and throttle position sensor 2 signal circuit.
|
|
19.
|
If all circuits test normal, replace the Q38 Throttle Body.
|
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
