DTC P0121-P0123, P0222, P0223, or P2135 - LLU
Diagnostic Instructions
DTC Descriptors
DTC P0121 00: Throttle Position Sensor
Performance
DTC P0122 00: Throttle Position Sensor Circuit
Low Voltage
DTC P0123 00: Throttle Position Sensor Circuit
High Voltage
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
|
5 V Reference
|
P06A3 00
|
P0122 00, P0222 00
|
P0223 00, P06A3 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
|
-
|
-
|
Typical Scan Tool Data
Throttle Position
Sensor 1
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: The engine is
idling.
Parameter Normal Range: Throttle
position sensor 1 - 3.8-4.4 V
|
5 V Reference
|
0 V
|
0 V
|
5 V
|
Throttle Position Sensor 1 Signal
|
0 V
|
0 V
|
5 V
|
Throttle Position Sensor 1 Low Reference
|
-
|
4.98 V
|
-
|
Throttle Position
Sensor 2
Circuit
|
Short to Ground
|
Open
|
Short to Voltage
|
Operating Conditions: The engine is
idling.
Parameter Normal Range: Throttle
position sensor 2-0.75-1.02 V
|
5V Reference
|
0.02 V
|
0 V
|
5 V
|
Throttle Position Sensor 2 signal
|
0 V
|
5 V
|
5 V
|
Throttle Position Sensor 2 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
P0122 00, P0123 00, P0222 00, P0223 00
• |
The system voltage is more than 6 V. |
• |
The ignition is in the unlock/accessory or run
position. |
• |
DTC P0641 00 or P06A3 00 are not
set. |
• |
DTCs P0122 00, P0123 00,
P0222 00, P0223 00 run continuously when the above
conditions are met. |
P0121 00
• |
DTCsP0102 00, P0103 00, P0107 00,
P0108 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 inlet air temperature (IAT) is between
-20 to +125°C (-4 to +257°F). |
• |
The DTC runs continuously when the above
conditions are met. |
P2135 00
• |
DTCs P0122 00, P0123 00, P0222 00,
P0223 00, P0641 00, or P06A3 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. |
• |
DTCs P2135 00 run continuously when the
above conditions are 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 0.27 V for more than 0.4 s.
P0123 00
The ECM detects that the throttle position sensor 1 voltage
is more than 4.67 V for more than 0.4 s.
P0222 00
The ECM detects that the throttle position sensor 2 voltage
is less than 0.31 V for more than 0.4 s.
P0223 00
The ECM detects that the throttle position sensor 2 voltage
is more than 4.7 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, P0222 00, P0223 00, or
P2135 00
• |
DTC P0122 00, P0123 00,
P0222 00, P0223 00, and P2135 00 are Type A
DTCs. |
• |
The ECM commands the throttle actuator
control (TAC) system to operate in a reduced engine power
mode. |
P0121 00
• |
DTC P0121 00 is a Type B DTC. |
• |
The ECM commands the throttle actuator
control (TAC) system to operate in a reduced engine power
mode. |
Conditions for Clearing the DTC
• |
DTC P0122 00, P0123 00,
P0222 00, P0223 00, and P2135 00 are Type A
DTCs. |
• |
DTC P0121 00 is a Type B DTC. |
Diagnostic Aids
• |
It may be necessary to disconnect the battery to
clear DTC P2135 00. |
• |
A high resistance condition on the throttle
actuator control circuits could cause a DTC to set. |
Reference Information
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
Circuit/System Verification
- Ignition ON, observe the Throttle Position
Sensor 1 parameter. The reading should be between
0.18-4.63 V and change with accelerator pedal input.
- 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.
- Observe the DTC Information with a scan tool.
DTCs P0121 00, P0122 00, P0123 00,
P0221 00, P0222 00, P0223 00, and P2135 00
should not set.
- Observe both Throttle Position Sensor 1 and
Throttle Position Sensor 2 percentage parameters while quickly
pressing the accelerator pedal from a closed throttle to WOT. Both
Throttle Position Sensor 1 and Throttle Position Sensor 2
percentage parameters should change.
- 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.
Circuit/System Testing
Note: You must perform the
circuit/system verification before proceeding with circuit/system
testing.
- Ignition OFF, disconnect the harness connector at the
Q38 Throttle Body. Allow sufficient time for the
K20 Engine Control Module to completely power down.
- Ignition OFF, test for less than 5 Ω between the
Q38 Throttle Body harness connector low reference circuit
terminal C and ground.
⇒ |
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. |
- Ignition ON, test for 4.8-5.2 V between the
Q38 Throttle Body harness connector 5 V reference circuit
terminal E and ground.
⇒ |
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. |
⇒ |
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. |
- Test for less than 1 V between the
Q38 Throttle Body harness connector throttle position
sensor 1 signal circuit terminal D and ground.
⇒ |
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. |
- Test for 4.8-5.2 V between the Q38 Throttle
Body harness connector throttle position sensor 2 signal
circuit terminal F and ground.
⇒ |
If less than 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. |
⇒ |
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. |
- Install a 3 A fused jumper wire between
Q38 Throttle Body harness connector throttle position
sensor 1 signal circuit terminal D and the 5 V
reference circuit terminal E. Verify the scan tool Throttle
Position Sensor 1 voltage parameter is greater than
4.8 V.
⇒ |
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. |
- Install a 3 A fused jumper wire between
Q38 Throttle Body harness connector throttle position
sensor 2 signal circuit terminal F and the low reference
circuit terminal C. Verify the scan tool Throttle Position
Sensor 2 voltage parameter is less than 0.1 V.
⇒ |
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. |
- Ignition OFF, disconnect the ECM X1 harness
connector at the K20 Engine Control Module.
- 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 E to
the corresponding ECM terminal X2-56. |
• |
The throttle position sensor 2 signal circuit
terminal F to the corresponding ECM terminal X2-9 |
• |
The throttle position sensor 1 signal circuit
terminal D to the corresponding ECM terminal X2-5 |
⇒ |
If greater than 5 Ω, repair the affected
circuit. |
- Test for infinite resistance between Q38 Throttle
Body throttle position sensor 1 signal circuit terminal D
and throttle position sensor 2 signal circuit
terminal F.
⇒ |
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. |
- If all circuits test normal, replace the
Q38 Throttle Body.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|