GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Vivant 🢒 Engine 🢒 Engine Controls - 2.0L (L34 GMDAT) 🢒 DTC 022

Circuit Description

The throttle position (TP) sensor provides a voltage signal that changes in relation to the throttle plate angle. The signal voltage will vary from about 0.4-0.8 volt at idle to nearly 5 volts at wide open throttle. The TP sensor is one of the most important inputs used by the electronic control module (ECM) for fuel control and other functions such as idle, wide open throttle, deceleration enleanment, and acceleration enrichment.

Conditions for Setting the DTC
    • The TP sensor reading is less than 11 counts for at least 2 seconds.
    • DTCs 033 and 034 are not set.

Diagnostic Aids
    • Inspect the ECM terminals and the TP sensor connector terminals for improper mating and poor terminal-to-wire connections.
    • Observe the TP sensor voltage on a scanner with the ignition ON and the engine stopped. Press the accelerator pedal while watching for smooth changes in the voltage readings of the TP sensor.

Step

Action

Values

Yes

No

1

Was the Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls

2
  1. Connect a scan tool to the data link connector (DLC).
  2. Turn ON the ignition.
  3. Operate the throttle lever from closed to open while watching the throttle position (TP) sensor voltage on the scan tool.

Does the scan tool show the TP sensor voltage change smoothly within the values specified?

0.10-0.9 V to 3.9-4.9 V

Go to Diagnostic Aids

Go to Step 3

3
  1. Turn the ignition to LOCK.
  2. Disconnect the TP sensor connector.
  3. Turn ON the ignition.
  4. Measure the voltage between the TP sensor connector terminals 2 and 1.

Is the voltage within the value specified?

4.5-5.5 V

Go to Step 4

Go to Step 5

4

Connect a fused jumper between the TP sensor connector terminals 2 and 3.

Does the scan tool show the TP sensor voltage above the value specified?

4 V

Go to Step 10

Go to Step 8

5

Measure the voltage between the TP sensor connector terminal 2 and ground.

Is the voltage within the value specified?

4.5-5.5 V

Go to Step 6

Go to Step 7

6
  1. Turn the ignition to LOCK.
  2. Inspect for an open in the wire between the TP sensor connector terminal 1 and the engine control module (ECM) connector terminal B2.

Did you find the condition?

--

Go to Step 9

Go to Step 11

7
  1. Turn the ignition to LOCK.
  2. Inspect for an open or short to ground in the wire between the TP sensor connector terminal 2 and the ECM connector terminal D8.

Did you find the condition?

--

Go to Step 9

Go to Step 11

8
  1. Turn the ignition to LOCK.
  2. Inspect for an open or short to ground between the TP sensor connector terminal 3 and the ECM connector terminal D5.

Did you find the condition?

--

Go to Step 9

Go to Step 11

9
  1. Repair the wire or the connector terminals as needed.
  2. Clear and DTCs from the ECM.
  3. Perform the Diagnostic System Check.

Did you complete the repair?

--

System OK

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10
  1. Replace the TP sensor. Refer to Throttle Position Sensor Replacement .
  2. Clear any DTCs from the ECM.
  3. Perform the Diagnostic System Check.

Did you complete the repair?

--

System OK

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11
  1. Turn the ignition to LOCK.
  2. Replace the ECM. Refer to Engine Control Module Replacement .
  3. Perform the Diagnostic System Check.

Did you complete the repair?

--

System OK

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