Hummer H2. Manual - part 1676

Is the HO2S voltage parameter less than the specified
value?

Go to Step 6

Go to Step 5

Test the HO2S high signal circuit for an open or high
resistance. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 9

1. Remove the jumper wire from the previous step.

2. Connect a 3-amp fused jumper wire between the

high signal circuit of the HO2S harness
connector on the engine harness side and the low
signal circuit of the HO2S harness connector on
the engine harness side.

3. Observe the HO2S voltage parameter with a scan

tool.

Is the HO2S voltage parameter less than the specified
value?

100
mV

Go to Step 8

Go to Step 7

Test the HO2S low signal circuit for an open or high
resistance. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 9

Test for shorted terminals and for poor connections at
the HO2S. Refer to Testing for Intermittent
Conditions and Poor Connections and Connector
Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 10

Test for shorted terminals and for poor connections at
the powertrain control module (PCM). Refer to Testing
for Intermittent Conditions and Poor Connections
and Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 12

Go to Step 11

A silicon contaminated HO2S

Fuel contamination - Refer to
Alcohol/Contaminants-in-Fuel Diagnosis
(without Special Tool and E85) or

NOTE:

Refer to Silicon Contamination of Heated Oxygen
Sensors Notice in Cautions and Notices.

IMPORTANT:

The HO2S may be damaged due to contamination.
Prior to replacing the HO2S inspect for the following
sources of contamination:

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 P1380

System Description

The powertrain control module (PCM) detects engine misfire events by monitoring variations in the crankshaft
rotation speed. Wheel speed changes caused by rough road conditions can cause changes in crankshaft speed.
By monitoring the wheel speed sensors, the anti-lock brake system (ABS) can determine if the vehicle is
operating on a rough road. If the ABS is detecting a rough road condition severe enough to effect misfire
detection, a rough road signal is sent to the PCM on the serial data circuit. If DTC P0300 is set and the rough
road information is not available due to an ABS malfunction, DTC P1380 will set.

Conditions for Running the DTC

DTCs P0101, P0102, P0103, P0120, P0335, P0336, P0742 are not set.

The vehicle speed is greater than 16 km/h (10 mph).

The engine load is less than 60 percent.

Alcohol/Contaminants-in-Fuel Diagnosis (with
Special Tool) .

Engine oil consumption - Refer to Oil
Consumption Diagnosis in Engine Mechanical.

Engine coolant consumption - Refer to Loss of
Coolant in Engine Cooling.

Replace the affected HO2S. Refer to Heated Oxygen
Sensor (HO2S) Replacement Bank 1 Sensor 1 or
Heated Oxygen Sensor (HO2S) Replacement Bank 2
Sensor 1 .Did you complete the replacement?

Go to Step 12

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

Go to Step 12

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 13

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

The engine misfire is detected-DTC P0300 set.

The engine speed is less than 3,200 RPM.

Conditions for Setting the DTC

An ABS malfunction exists preventing the PCM from receiving rough road detection data.

Action Taken When the DTC Sets

The control module stores the DTC information into memory when the diagnostic runs and fails.

The malfunction indicator lamp (MIL) will not illuminate.

The control module records the operating conditions at the time the diagnostic fails. The control module
stores this information in the Failure Records.

The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

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
non-emission related diagnostic.

Clear the DTC with a scan tool.

DTC P1380

DTC P1381

System Description

Conditions for Running the DTC

The vehicle speed is above 16 km/h (10 mph).

The engine speed is below 3,200 RPM.

The engine load is less than 60 percent.

Engine misfire is detected-DTC P0300 set.

Step

Action

Yes

Did you perform the Diagnostic
System Check - Engine Controls?

Go to Diagnostic System Check -

ABS in Anti-lock Brake System

Go to Diagnostic System

Check - Engine Controls

2004 Hummer H2

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

Hummer H2

Conditions for Setting the DTC

A serial data malfunction exists preventing the PCM from receiving rough road detection data.

The above conditions met for 20 seconds.

Action Taken When the DTC Sets

The control module stores the DTC information into memory when the diagnostic runs and fails.

The malfunction indicator lamp (MIL) will not illuminate.

The control module records the operating conditions at the time the diagnostic fails. The control module
stores this information in the Failure Records.

The driver information center, if equipped, may display a message.

Conditions for Clearing the DTC

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
non-emission related diagnostic.

Clear the DTC with a scan tool.

Test Description

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

1: This step will diagnose a malfunction in the serial data circuits.

DTC P1381

DTC P1516

Circuit Description

The predicted throttle position (TP) is compared to the actual throttle position. The two values should be within
a calibrated range of each other. Both the powertrain control module (PCM) and the throttle actuator control
(TAC) module redundantly monitor the predicted and actual throttle position. This DTC sets if the PCM detects
an out of range condition between the predicted and the actual throttle position.

Conditions for Running the DTC

DTC U0107 is not set.

The ignition switch is in the Crank or Run position.

The ignition voltage is more than 5.23 volts.

Step

Action

Yes

Did you perform the Diagnostic
System Check - Engine Controls?

Go to Diagnostic System Check -

ABS in Anti-lock Brake System

Go to Diagnostic System

Check - Engine Controls

2004 Hummer H2

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

Hummer H2

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