Test Description
The number below refers to the step number on the diagnostic table.
- 7:
This test will determine an intermittent faulty TP sensor utilizing the DMMs MIN MAX, 100 millisecond capture mode.
DTC P1121
| Step |
Action |
Yes |
No |
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views
or Powertrain Control Module (PCM) Connector End Views |
| 1 |
Did you perform the Diagnostic System Check - Vehicle? |
Go to Step 2 |
Go to Diagnostic System Check - Vehicle
in Vehicle DTC Information |
| 2 |
- Turn OFF the ignition.
- Disconnect the throttle position (TP) sensor electrical connector.
- Turn ON the ignition, with the engine OFF.
- Measure the voltage from the 5-volt reference circuit of the TP sensor to a good ground with a DMM.
- Lightly touch and move the related engine wiring harnesses and connectors for all 5-volt reference circuits while observing voltage. Any change in voltage indicates the area where a short to voltage may be found. Refer to Testing for Electrical Intermittents
and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 9 |
Go to Step 3 |
| 3 |
- Measure the voltage from the signal circuit of the TP sensor to a good ground with a DMM.
- Lightly touch and move the related engine wiring harnesses and connectors while observing voltage. Any change in voltage indicates the area where a short to voltage may be found. Refer to Testing for Electrical Intermittents
and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 9 |
Go to Step 4 |
| 4 |
- Measure the resistance from the low reference circuit of the TP sensor to a good ground with a DMM.
- Lightly touch and move the related engine wiring harnesses and connectors while observing resistance. Any change in resistance indicates the area where an open or high resistance may be found. Refer to Testing for Electrical Intermittents
, Testing for Intermittent Conditions and Poor Connections
and Wiring Repairs
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 9 |
Go to Step 5 |
| 5 |
Test for poor connections at the TP sensor harness connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 9 |
Go to Step 6 |
| 6 |
Test for poor connections at the powertrain control module (PCM) harness connector. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems.
Did you find and correct the condition? |
Go to Step 9 |
Go to Step 7 |
| 7 |
- Turn OFF the ignition.
- Measure the resistance between the TP sensor signal terminal and the low reference terminal at the TP sensor using the MIN MAX function on the DMM.
- Slowly press the accelerator pedal to the wide open throttle (WOT) position, then release the pedal back to the closed throttle position several times.
Did you observe a MAX value of infinite ohms or a MIN value of 0 ohms? |
Go to Step 8 |
Go to Intermittent Conditions |
| 8 |
Replace the TP sensor. Refer to Throttle Position (TP) Sensor Replacement
.
Did you complete the replacement? |
Go to Step 9 |
- |
| 9 |
- Clear the DTCs with a scan tool.
- Turn OFF the ignition for 30 seconds.
- Start the engine.
- 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.
Did the DTC fail this ignition? |
Go to Step 2 |
Go to Step 10 |
| 10 |
Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle
in Vehicle DTC Information |
System OK |