P2123
DTC P2123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "D" CIRCUIT HIGH INPUTComponent Location:
GENERAL DESCRIPTION
The Electronic Throttle Control (ETC) system is made of the components throttle body, Throttle Position Sensor (TPS) 1 & 2 and Accelerator Position Sensor (APS) 1 & 2. The APS is mounted in the accelerator pedal to detect the opening angle of the accelerator pedal. It has 2 sensors to detect the accelerator position and a malfunction of the accelerator position sensor. The ECM judges the current opening angle of the accelerator pedal from APS 1 & 2, and the ECM controls the throttle motor based on these signals.
DTC DESCRIPTION
ECM sets DTC P2123 if the ECM detects output voltage higher than the possible range of a properly operating APS 1.
DTC Detecting Condition:
Schematic Diagram:
Signal Waveform And Data Part 1:
Signal Waveform And Data Part 2:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or the ECM's connector, which was repaired but ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
GROUND CIRCUIT INSPECTION
NOTE: Check for open or short circuit in harness. Refer to "Signal Waveform & Data " in the "General Information" procedure
1. Ignition "OFF"
2. Disconnect APS harness connector.
3. Measure resistance between terminal 5 of the APS harness connector and chassis ground.
Specification : Approx. 0 ohm
4. Is resistance within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure
SIGNAL CIRCUIT INSPECTION
NOTE: Check for open or short circuit in harness. Refer to "Signal Waveform & Data" in the "General Information" procedure
1. Disconnect ECM connector.
2. Ignition "ON" & Engine "OFF".
3. Measure voltage between terminal 2 of the APS 1 harness connector and chassis ground.
Specification : Approx. 0 ohm
4. Is voltage within the specification?
YES - Go to next step as below
NO - Repair as necessary and go to "Verification of Vehicle Repair" procedure
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Go to next step as below
COMPONENT INSPECTION
1. Accelerator Pedal Rod inspection
1. Verify that the accelerator pedal operate freely without binding between full closed and wide open position by operating the accelerator pedal.
2. Check for poor carpet fit under the accelerator controls pedal.
3. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure. If OK, go to next step as below.
2. APS 1 Inspection
1. Reconnect ECM and APS harness connector.
2. With ignition "ON", install Scantool and monitor the "APS 1" parameter on the Scantool data list.
Specification : Refer to "Signal Waveform & Data" in the "General Information" procedure
3. Is sensor data near the specified value?
YES - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Check APS for contamination, deterioration, or damage. Substitute with a known-good APS and check for proper operation. If the problem is corrected, replace APS and then go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.