Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step verifies that a condition exists.
- 4: This step tests for a condition in the signal circuit of the TP sensor. If the TP sensor voltage parameter displays a voltage after the throttle body is disconnected, test for a short to voltage in the signal circuit.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views |
||||
| 1 | Did you perform the Diagnostic System Check - Engine Controls? | - | Go to Step 2 | Go to Diagnostic System Check - Engine Controls |
| 2 |
|
4.9 V | Go to Step 3 | Go to Step 4 |
| 3 |
|
- | Go to Step 4 | Go to Intermittent Conditions |
| 4 |
|
0.1 V | Go to Step 5 | Go to Step 8 |
| 5 | Measure the voltage between the 5-volt reference circuit of the TP sensor and the ECM housing with a DMM. Is the voltage less than the specified value? |
5.2 V | Go to Step 6 | Go to Step 9 |
| 6 | Measure the voltage between low reference circuit of the TP sensor and the ECM housing. Is the voltage less than the specified value. |
1 V | Go to Step 7 | Go to Step 13 |
| 7 |
|
10 Ω | Go to Step 11 | Go to Step 10 |
| 8 | Test the signal circuit of TP sensor for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 12 |
| 9 |
IMPORTANT:
The 5-volt reference circuits are internally and externally connected at the controller. Other sensors that share the 5-volt reference circuit may also have DTCs set. Disconnecting a sensor on the shared 5-volt reference circuit may isolate a shorted sensor. Review the electrical schematic and diagnose the shared circuits and sensors. Test the 5-volt reference circuit of the TP sensor and all shared 5-volt reference circuits for a short to voltage. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems.Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 12 |
| 10 | Test the low reference circuit of the TP sensor for an open or a high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 16 | Go to Step 12 |
| 11 | Test for shorted terminals and for poor connections at the throttle body assembly. 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 16 | Go to Step 14 |
| 12 | Test for shorted terminals and for poor connections at the ECM. 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 16 | Go to Step 15 |
| 13 |
IMPORTANT:
The control module and/or the throttle body assembly may be damaged if the circuit is shorted to battery positive voltage. Repair the short to voltage in the low reference circuit of the TP sensor. Refer to Wiring Repairs
in Wiring Systems.Did you complete the repair? |
- | Go to Step 16 | - |
| 14 | Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 15 | Replace the ECM. Refer to Engine Control Module Replacement
. Did you complete the replacement? |
- | Go to Step 16 | - |
| 16 |
|
- | Go to Step 2 | Go to Step 17 |
| 17 | Are there any DTCs that have not been diagnosed? | - | Go to Diagnostic Trouble Code (DTC) List | System OK |