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Makes 🢒 Chevrolet 🢒 2003 🢒 Chevy Kodiak Conventional Cab 🢒 Bulletins 🢒 SMU - Revised DTC P0220

SMU - Revised DTC P0220

Subject:Revised DTC P0220

Models:2003 Chevrolet Kodiak C-Series Crew and Conventional Cab Models
2003 GMC TopKick C-Series Crew and Conventional Cab Models


This bulletin is being issued to revise DTC P0220 in the Engine Controls - 8.1L sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

DTC P0220

Circuit Description

The throttle position (TP) sensor is mounted on the throttle body assembly. The sensor is actually two individual TP sensors within one housing. Two separate signal, low reference, and 5 volt reference circuits are used to connect the TP sensor assembly to the throttle actuator control (TAC) module. The 2 sensors have opposite functionality. The TP sensor 1 signal voltage is pulled up to reference voltage as the throttle opens, from below 1.0 volt at closed throttle to above 3.5 volts at wide open throttle (WOT). The TP sensor 2 signal voltage is pulled down to low reference from around 3.8 volts at closed throttle to below 1.0 volt at WOT. TP sensor 1 and APP sensor 1 share a 5-volt reference circuit that are connected within the TAC module. TP sensor 2 and APP sensor 2 share a 5-volt reference circuit that are connected within the TAC module. If an out of range condition is detected with the TP sensor 2, this diagnostic trouble code (DTC) will set and the Reduced Engine Power message will be displayed.

Conditions for Running the DTC

    • DTC P1518 are not set.
    • The ignition switch in the crank or run position.
    • The ignition voltage is greater than 5.23 volts.

Conditions for Setting the DTC

    • The TP sensor 2 voltage is less than 0.13 volts or greater than 4.87 volts.
    • All above conditions are present for less than 1 second.

Action Taken When the DTC Sets

    • The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
    • The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame and/or Failure Records.
    • The control module commands the TAC system to operate in the Reduced Engine Power mode.
    • A message center or an indicator displays Reduced Engine Power.
    • Under certain conditions the control module commands the engine OFF.

Conditions for Clearing the MIL/DTC

    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    • Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

    • Inspect the TAC module connectors for signs of water intrusion. When this occurs, multiple DTCs could be set with no circuit or component conditions found during diagnostic testing.
    • When the TAC module detects a condition within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the stored information, Capture Info.
    • If this DTC is determined to be intermittent, refer to Intermittent Conditions .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. When the TAC module detects a condition within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual condition may correct more than one DTC. Disconnecting components during testing may set additional DTCs. Keep this in mind when reviewing the stored information, Capture Info.

Step

Action

Values

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Powertrain Control Module (PCM) 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
  1. Turn OFF the ignition.
  2. Remove the air inlet duct from the throttle body.
  3. Disconnect the throttle body harness connector.
  4. Connect jumper wires between the throttle position (TP) sensor 2 terminals of the throttle body harness connector and the corresponding TP sensor 2 terminals of the throttle body.
  5. Turn ON the ignition, with the engine OFF.
  6. Close the throttle blade by hand.
  7. Observe the TP sensor 2 voltage with a scan tool.

Is the TP sensor 2 voltage within the specified range?

0.28-0.81 V

Go to Step 3

Go to Step 7

3
  1. Open the throttle blade to wide open throttle (WOT) by hand.
  2. Observe the TP sensor 2 voltage parameter on the scan tool.

Is the TP sensor 2 voltage parameter more than the specified value?

4.60 V

Go to Step 7

Go to Step 4

4
  1. Disconnect the TP sensor harness connector.
  2. Disconnect the throttle actuator control (TAC) module harness connector containing the TP sensor circuits.
  3. Test the TP sensor low-reference circuit for a short to ground with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 5

5
  1. Turn OFF the ignition for 15 seconds.
  2. Connect the TAC module harness connector.
  3. Connect the throttle body harness connector.
  4. Install the air inlet duct.
  5. Turn ON the ignition, with the engine OFF.
  6. Select the DTC Info option on the scan tool.
  7. Lightly touch and move the related engine wiring harnesses and connectors for the TP sensor while observing the DTC Info. The DTC will set if an intermittent condition is present. Refer to Connector Repairs and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 6

6
  1. Continue to observe the DTC Info.
  2. Slowly depress the accelerator pedal to WOT, then slowly return the pedal to the released position 3 times.

Does the scan tool indicate this DTC failed this ignition?

--

Go to Step 25

Go to Diagnostic Aids

7
  1. Disconnect the TP sensor harness connector.
  2. Measure the voltage at the TP sensor 2 signal circuit with a DMM connected to ground.

Is the voltage within the specified range?

3.94-6.06 V

Go to Step 12

Go to Step 8

8
  1. Turn OFF the ignition.
  2. Disconnect the TAC module harness connector containing the TP sensor circuits.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the TP sensor 2 signal circuit for a short to voltage with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 9

9

Test the TP sensor 2 signal circuit for an open or high resistance with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 10

10

Test the TP sensor 2 signal circuit for a short to ground with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 11

11
  1. Disconnect the other TAC module harness connector.
  2. Test for a short between the TP sensor 2 signal circuit and all other TAC module circuits with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 26

12

Measure the voltage from the TP sensor 2, 5-volt reference circuit to a good ground with a DMM. Refer to Circuit Testing in Wiring Systems.

Is the voltage within the specified range?

4.54-5.21 V

Go to Step 22

Go to Step 13

13

Is the voltage more than the specified value?

5.21 V

Go to Step 14

Go to Step 16

14
  1. Turn OFF the ignition.
  2. Disconnect the TAC module harness connector containing the TP sensor circuits.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the TP sensor 2, 5-volt reference circuit for a short to voltage with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 15

15
  1. Turn OFF the ignition.
  2. Disconnect the accelerator pedal position (APP) sensor harness connector.
  3. Disconnect the other TAC module harness connector.
  4. Turn ON the ignition, with the engine OFF.
  5. Test the APP sensor 2, 5-volt reference circuit for a short to voltage with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 20

16

Disconnect the APP sensor.

Is the voltage less than the specified value?

4.54 V

Go to Step 17

Go to Step 28

17
  1. Disconnect the TAC module harness connector containing the TP sensor circuits.
  2. Test the TP sensor 2, 5-volt reference circuit for an open or high resistance with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 18

18

Test the TP sensor 2, 5-volt reference circuit for a short to ground with a DMM.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 19

19

Test the APP sensor 2, 5-volt reference circuit for a short to ground with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 21

20

Test for a short between the TP sensor 2, 5-volt reference circuit and all other TAC module circuits with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 21

21

Test for a short between the APP sensor 2, 5-volt reference circuit and all other TAC module circuits with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 26

22
  1. Connect a fused jumper between the TP sensor 2 low-reference circuit and the TP sensor 2 signal circuit.
  2. Observe the TP sensor 2 voltage parameter with a scan tool.

Is the TP sensor 2 parameter near the specified value?

0 V

Go to Step 24

Go to Step 23

23
  1. Turn OFF the ignition.
  2. Disconnect the TAC module harness connector containing the TP sensor circuits.
  3. Test the TP sensor 2 low-reference circuit for an open or high resistance with a DMM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 26

24

Inspect for an intermittent and for a poor connection at the throttle body harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 27

25

Inspect for an intermittent and for a poor connection at the APP sensor harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 28

26

Inspect for an intermittent and for a poor connection at the TAC module harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 29

27

Replace the throttle body assembly. Refer to Throttle Body Assembly Replacement.

Did you complete the replacement?

--

Go to Step 30

--

28

Replace the APP sensor. Refer to Accelerator Pedal Position (APP) Sensor Replacement.

Did you complete the replacement?

--

Go to Step 30

--

29

Replace the TAC module. Refer to Throttle Actuator Control (TAC) Module Replacement.

Did you complete the replacement?

--

Go to Step 30

--

30
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. 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 31

31

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK