Hummer H1 (2006+). Instruction - page 68

OBD-116

On-Board Diagnostics

_____________________________________________

6

1.

Connect a 3-amp fused jumper between the signal circuit 324
(YL) of the fuel temperature sensor and the low reference
circuit 252 (BR).

2.

Observe the fuel temperature sensor with the scan tool.

Is the fuel temperature sensor parameter more than the specified
value?

138°C

(280°F)

Go to Step 10

Go to Step 7

7

1.

Turn OFF the ignition.

2.

Connect a 3-amp fused jumper between the signal circuit 324
(YL) of the fuel temperature sensor and a good ground.

3.

Turn ON the ignition, with the engine OFF.

4.

Observe the fuel temperature sensor parameter with a scan
tool.

Is the fuel temperature sensor parameter more than the specified
value?

138°C

(280°F)

Go to Step 9

Go to Step 8

8

Test the fuel temperature sensor signal circuit 324 (YL) for an
open or high resistance between C76 pin 27 and pin B of the fuel
temp sensor.

Did you find and correct the condition?

Go to Step 15

Go to Step 12

9

Test the low reference circuit 252 (BR) of the fuel temperature
sensor for an open or high resistance between C77 pin 48 and pin
A of the fuel temp sensor.

Did you find and correct the condition?

Go to Step 15

Go to Step 12

10

Test the signal circuit 324 (YL) of the fuel temperature sensor for
a short to any other 5-volt reference circuit.

Did you find and correct the condition?

Go to Step 15

Go to Step 11

11

Test for an intermittent and for a poor connection at the fuel tem-
perature sensor.

Did you find and correct the condition?

Go to Step 15

Go to Step 13

12

Test for an intermittent and for a poor connection at the engine
control module (ECM).

Did you find and correct the condition?

Go to Step 15

Go to Step 14

13

Replace the faulty fuel temperature sensor.

Did you complete the replacement?

Go to Step 15

14

Replace the faulty ECM.

Did you complete the replacement?

Go to Step 15

15

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 16

16

1.

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

_____________________________________________

On-Board Diagnostics OBD-117

5745804

DTC P0192 Fuel Rail Pressure Sensor Circuit Low Voltage (Figure OBD-35)

Figure OBD-35: Fuel Rail Pressure Sensor Circuit

Circuit Description

The engine control module (ECM) monitors the fuel rail pressure (FRP) via a FRP sensor. When the fuel rail pressure is high the
signal voltage is high. When the FRP is low the signal voltage is low. If the FRP is not above the lower limit for the sensor, DTC
P0192 will set.

Conditions for Setting the DTC

The ECM detects the signal circuit is less than 1.2 MPa for more 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 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.

OBD-118

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.

Install a scan tool.

2.

Turn ON the ignition, with the engine OFF.

3.

Observe the Actual Fuel Rail Pressure parameter with a scan
tool.

Is the Actual Fuel Rail Pressure parameter within the specified
range?

1.2-1.9

MPa

Intermittent Go

To Diagnostic

Aids

Go to Step 3

3

1.

Turn OFF the ignition.

2.

Disconnect the fuel rail pressure (FRP) sensor.

3.

Turn ON the ignition, with the engine OFF.

4.

Observe the Actual Fuel Rail Pressure parameter with a scan
tool.

Is the Actual Fuel Rail Pressure parameter less than the specified
value?

175 MPa

Go to Step 4

Go to Step 5

4

Test the signal circuit 509 (YL) of the FRP sensor for a short to
ground or high resistance between C76 pin 42 and pin A of the
FRP sensor.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

5

Replace the faulty FRP sensor.

Did you complete the replacement?

Go to Step 7

6

Replace the faulty engine control module (ECM).

Did you complete the replacement?

Go to Step 7

7

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 8

8

1.

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.

_____________________________________________

On-Board Diagnostics OBD-119

5745804

DTC P0193 Fuel Rail Pressure Sensor Circuit Low Voltage (Figure OBD-36)

Figure OBD-36: Fuel Rail Pressure Sensor Circuit

Circuit Description

The engine control module (ECM) monitors the fuel rail pressure (FRP) via a FRP sensor. When the FRP is high, the signal voltage
is high. When the FRP is low, the signal voltage is low. If the fuel rail pressure is above the upper limit for the sensor, DTC P0193
will set.

Conditions for Setting the DTC

The ECM detects the signal circuit is more than 175 MPa.

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.

• The control module limits fuel injection and FRP.

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.

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