Hummer H1 (2006+). Manual - part 95

OBD-224

On-Board Diagnostics

_____________________________________________

Step

Action

Value(s)

Yes

No

    1

NOTE: Before clearing DTC(s) use the scan tool “Capture info”
to record Freeze Frame and Failure Records for reference, as data
will be lost when “Clear Info” function is used 

Was the “On-Board Diagnostic (OBD) System Check” per-
formed?

Go to step 2.

Go to OBD Sys-

tem Check.

    2

1.

Observe the Freeze Frame/Failure records for this DTC.

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 3

Go to Intermit-

tent Conditions 

    3

1.

Turn OFF the ignition.

2.

Disconnect the accelerator pedal position (APP) sensor.

3.

Turn ON the ignition, with the engine OFF.

4.

Observe the 5-Volt Reference 3 parameter with a scan tool.

Is the 5-Volt Reference 3 parameter within the specified range?

4.7-5.2

Volts

Go to Step 8

Go to Step 4

    4

1.

Disconnect the camshaft position (CMP) sensor.

2.

Turn ON the ignition, with the engine OFF.

3.

Observe the 5-Volt Reference 3 parameter with a scan tool.

Is the 5-Volt Reference 3 parameter within the specified range?

4.7-5.2

Volts

Go to Step 9 

Go to Step 5

    5

Test the 5-volt reference circuit 254 (RD) of the CMP sensor for
a short to ground. 

Did you find and correct the condition?

Go to Step 10

Go to Step 6 

    6

Test the 5-volt reference circuit 723 (YL) of the APP sensor 3 for
a short to ground.

Did you find and correct the condition?

Go to Step 10 

Go to Step 7 

    7

Replace the faulty engine control module (ECM). 

Did you complete the replacement?

Go to Step 10 

    8

Replace the faulty APP sensor.

Did you complete the replacement?

Go to Step 10 

    9

Replace the faulty CMP sensor. 

Did you complete the replacement?

Go to Step 10 

    10

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 1 

Go to Step 11

_____________________________________________

 On-Board Diagnostics  OBD-225

5745804

   11

Using the Scan Tool select “Capture Info,” Review Info.” Are
any DTC’s displayed that have not been diagnosed?

Go to the appli-

cable DTC 

table.

System OK.

Step

Action

Value(s)

Yes

No

OBD-226

On-Board Diagnostics

_____________________________________________

DTC P0699 5 Volt Reference 3 Circuit High Voltage (Figure OBD-64)

Figure OBD-64:   5 Volt Reference 3 Circuit

Circuit Description

The engine control module (ECM) provides 5 volts to the following sensors:

• The accelerator pedal position (APP) sensor 3 

• The camshaft position (CMP) sensor 

These 5-volt reference circuits are independent of each other outside the ECM, but are bussed together inside the ECM. Therefore,
a circuit condition on one sensor 5-volt reference circuit may affect the other sensor 5-volt reference circuits. The ECM monitors
the voltage on the 5-volt reference circuit. If the ECM detects a high voltage condition, DTC P0699 sets.

Conditions for Setting the DTC 

• The ECM detects the 5-volt reference 3 circuit voltage is more than 5.2 volts. 

• The above condition is present for 2 seconds. 

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 informa-

tion in the Freeze Frame/Failure Records. 

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. 

_____________________________________________

 On-Board Diagnostics  OBD-227

5745804

Step

Action

Value(s)

Yes

No

    1

NOTE: Before clearing DTC(s) use the scan tool “Capture info”
to record Freeze Frame and Failure Records for reference, as data
will be lost when “Clear Info” function is used 

Was the “On-Board Diagnostic (OBD) System Check” per-
formed?

Go to step 2.

Go to OBD Sys-

tem Check.

    2

1.

Turn ON the ignition, with the engine OFF.

2.

Observe the 5-Volt Reference 3 parameter with a scan tool.

Is the 5-Volt Reference 3 parameter more than the specified
value?

5.2 Volts

Go to Step 3

Go to Intermit-

tent Conditions 

    3

Test the accelerator pedal position (APP) 3 sensor 5-volt refer-
ence circuit 723 (YL) for a short to voltage.

Did yo find and correct the condition?

Go to Step 6 

Go to Step 4 

    4

Test the camshaft position (CMP) sensor 5-volt reference circuit
254 (RD) for a short to voltage.

Did yo find and correct the condition?

Go to Step 6 

Go to Step 5

    5

Replace the faulty engine control module (ECM). 

Did you complete the replacement?

Go to Step 10 

    6

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 1 

Go to Step 11

   7

Using the Scan Tool select “Capture Info,” Review Info.” Are
any DTC’s displayed that have not been diagnosed?

Go to the appli-

cable DTC 

table.

System OK.