Hummer H2. Manual - part 1547

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. Remember this if you review the stored information in Capture Info.

If this DTC is determined to be intermittent, refer to Intermittent Conditions .

Test Description

The number below refers to the step number on the diagnostic table.

31: 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.

DTC P0220

Step

Action

Values

Yes

Schematic Reference:Engine Controls Schematics
Connector End View Reference:Engine Controls Connector End Views or Powertrain Control
Module (PCM) Connector End Views

Did you perform the Diagnostic System Check -
Engine Controls?

Go to Step 2

Go to

Diagnostic

System Check -

Engine Controls

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

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

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

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

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

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

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

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

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 30

Go to Step 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

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

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

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

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

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.

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

Did you find and correct the condition?

Go to Step 30

Go to Step 20

Disconnect the APP sensor.
Is the voltage less than the specified value?

4.54 V

Go to Step 17

Go to Step 28

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

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

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 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

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

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

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

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0171/P0174 To DTC P0507 (TAC)) - 4.8L, 5.3L, and

6.0L - Hummer H2

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