Hummer H2. Manual — part 1667

2004 ENGINE PERFORMANCE

Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L - Hummer

H2

ENGINE CONTROLS DIAGNOSIS (DTC P0507 (TAC) TO DTC U0107)

DTC P0507 (TAC)

Circuit Description

The electronic throttle control (ETC) system uses various inputs from the powertrain control module (PCM).
This system uses these inputs to control the idle speed through serial data circuits to the throttle actuator control
(TAC) module. The DC motor, which is located on the throttle body, activates the throttle plate. In order to
decrease idle speed, the TAC module commands the throttle closed, reducing air flow into the engine, and the
idle speed decreases. In order to increase the idle speed, the TAC module commands the throttle plate open,
allowing more air in order to bypass the throttle plate. If the actual idle RPM does not match the desired idle
RPM within a calibrated time, this DTC will set.

Conditions for Running the DTC

z

DTCs P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0117, P0118, P0125, P0171, P0172, P0174,
P0175, P0200, P0300, P0440, P0442, P0443, P0500, P0502, P0503, P1120, P1220, P1221, P1441 are not
set.

z

The engine is running for greater than 60 seconds.

z

The engine coolant temperature (ECT) is greater than 60°C (140°F).

z

The intake air temperature (IAT) is greater than -10°C (+14°F).

z

The barometric pressure (BARO) is greater than 65 kPa.

z

The system voltage is between 9-18 volts.

z

The vehicle speed is less than 1.7 km/h (1 mph).

z

The accelerator pedal position (APP) sensor is at 0 percent.

Conditions for Setting the DTC

z

The actual idle speed is 200 RPM greater than the desired idle speed.

z

The above condition is present for 5 seconds.

Action Taken When the DTC Sets

z

The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition
cycle that the diagnostic runs and fails.

z

The control module records the operating conditions at the time the diagnostic fails. The first time the
diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic
reports a failure on the second consecutive ignition cycle, the control module records the operating
conditions at the time of the failure. The control module writes the operating conditions to the Freeze

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -

Hummer H2

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -

Hummer H2

Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC

z

The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles
that the diagnostic runs and does not fail.

z

A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

z

A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.

z

Clear the MIL and the DTC with a scan tool.

Test Description

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

2: This test determines if the engine can achieve the commanded RPM.

DTC P0507 (TAC)

Step

Action

Yes

No

Schematic Reference:Engine Controls Schematics
Connector End View Reference:Engine Controls Component Views or Powertrain Control Module
(PCM) 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. Set the park brake and block the drive wheels.

2. Start the engine.

3. Turn OFF all accessories.

4. Command the engine RPM to 1,500 RPM, to 500

RPM, and back to 1,500 RPM with the RPM control
function of the scan tool.

5. Exit the RPM control function.

Did the engine speed stay within 200 RPM of the
commanded RPM during the above test?

Go to Step 3

Go to Step 4

3

1. Observe the Freeze Frame/Failure Records for this

DTC.

2. Turn OFF the ignition for 30 seconds.

3. Use the following information to operate the vehicle

under the conditions which set the DTC:

z

The data in the Freeze Frame/Failure Records

z

The parameters listed in the Conditions for
Running in the DTC

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -

Hummer H2

DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, OR P2610

Description

This diagnostic applies to internal microprocessor integrity conditions within the powertrain control module
(PCM). This diagnostic also addresses if the PCM is not programmed.

Test Description

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

2: A DTC P0602 indicates the PCM is not programmed.

DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610

Does the DTC set?

Go to Step 4

Go to Intermittent

Conditions

4

Inspect for the following conditions:

z

Deposits in the throttle body

z

A faulty positive crankcase ventilation (PCV) valve

Did you find and correct the condition?

Go to Step 5

-

5

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 6

6

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

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check -
Engine Controls?

Go to Step 2

Go to Diagnostic

System Check - Engine

Controls

2

Is DTC P0602 set?

Go to Step 3

Go to Step 5

3

Program the PCM. Refer to Service
Programming System (SPS) in Programming.
Does DTC P0602 reset?

Go to Step 4

Go to Step 6

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -

Hummer H2

DTC P0641

Circuit Description

The powertrain control module (PCM) provides 5 volts to the following sensors:

z

The engine oil pressure (EOP) sensor

z

The manifold absolute pressure (MAP) sensor

These 5-volt reference circuits are independent of each other outside the PCM, but are bussed together inside
the PCM. Therefore a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt
reference circuits. The PCM monitors the voltage on the 5-volt reference circuit. If the PCM detects that the
voltage is out of tolerance, DTC P0641 sets.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

z

The PCM detects a voltage out of tolerance condition on the 5-volt reference circuit.

z

The above condition is present for longer than 2 seconds.

4

1. Ensure that all tool connections are secure.

2. Ensure that the programming equipment is

operating correctly.

3. Ensure that the correct software/calibration

package is used.

4. Attempt to program the PCM. Refer to

Service Programming System (SPS) in
Programming.

Does DTC P0602 reset?

Go to Step 5

Go to Step 6

5

Replace the PCM. Refer to Powertrain Control
Module (PCM) Replacement .
Did you complete the replacement?

Go to Step 6

-

6

1. Clear the DTCs with a scan tool.

2. Turn OFF the ignition for 30 seconds.

3. Start the engine.

Did the DTC fail this ignition?

Go to Step 2

Go to Step 7

7

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

2004 Hummer H2

2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0507 (TAC) To DTC U0107) - 4.8L, 5.3L, and 6.0L -

Hummer H2