0164

0164-THROTTLE POSITION SENSOR 1 CIRCUIT/OPEN





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on. Battery voltage greater than 10 volts.

- Set Condition:
The PCM detects an open in the TP Signal 1 circuit. One Trip Fault. ETC light will illuminate.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview.

Diagnostic Test

1. ACTIVE DTC
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

Start the engine and allow it to reach normal operating temperature.
With a scan tool, select View DTCs.
Is the DTC Active at this time?

Yes

- Go To 2

No

- Go To 8

2. THROTTLE POSITION SENSOR




Turn the ignition off.
Disconnect the Throttle Body harness connector.
Connect a jumper wire between the TP Signal 1 circuit and the TP Sensor ground circuit in the Throttle Body harness connector.
Ignition on, engine not running.
With a scan tool, monitor the TP Sensor No.1 voltage.

NOTE: The sensor voltage should be approximately 0.0 volts (plus or minus.1 volt) with the jumper wire in place.

Does the scan tool display the voltage as described above?

Yes

- Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool, select the ETC RELEARN function.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 3

NOTE: Remove the jumper wire before continuing.


3. TP SIGNAL 1 CIRCUIT SHORTED TO VOLTAGE




Turn the ignition off.
Disconnect the PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the TP Signal 1 circuit in the Throttle Body harness connector.
Is there any voltage present?

Yes

- Repair the short to voltage in the TP Signal 1 circuit.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 4

4. TP SIGNAL 1 CIRCUIT OPEN




Turn the ignition off.
Measure the resistance of the TP Signal 1 circuit from the Throttle Body harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go To 5

No

- Repair the open in the TP Signal 1 circuit.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

5. TP SIGNAL 1 CIRCUIT SHORTED TO THE 5-VOLT SUPPLY CIRCUIT




Measure the resistance between the TP Signal 1 circuit and the 5-volt Supply circuit in the Throttle Body harness connector.
Is the resistance below 100 ohms?

Yes

- Repair the short between the 5-volt Supply circuit and the TP Signal 1 circuit.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Go To 6

6. TP SENSOR GROUND CIRCUIT OPEN




Measure the resistance of the TP Sensor ground circuit from the Throttle Body harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?

Yes

- Go To 7

No

- Repair the open in the TP Sensor ground circuit.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

7. PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?

Yes

- Repair as necessary.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

No

- Replace and program the Powertrain Control Module.
- Perform the Powertrain Verification Test. Powertrain Verification Test.

8. ETC THROTTLE FOLLOWER TEST
With a scan tool, perform the ETC Throttle Follower Test.
Monitor the TP Sensor No.1 voltage.
Does voltage start at approximately 0.3 of a volt and go above 4.7 volts with a smooth transition?

Yes

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.Checking for an Intermittent DTC.

No

- Disconnect the Battery when replacing the Throttle Body Assembly. Replace the Throttle Body Assembly. After installation is complete, using a scan tool select the ETC RELEARN function.
- Perform the Powertrain Verification Test. Powertrain Verification Test.