Hummer H2. Manual - part 1552

DTC P0335

Circuit Description

The crankshaft position (CKP) sensor signal indicates the crankshaft speed and position. The CKP sensor
circuits are connected directly to the powertrain control module (PCM) and consists of the following circuits:

The 12-volt reference circuit

The low reference circuit

The CKP sensor signal circuit

If the PCM detects there is no signal from the CKP sensor for 8 seconds, DTC P0335 sets.

Conditions for Running the DTC

DTCs P0101, P0102, P0103, P0341, P0342, or P0343 are not set.

The camshaft position (CMP) sensor signal is incrementing.

The mass air flow (MAF) is more than 3 g/s.

The ignition switch is in the Crank position.

Conditions for Setting the DTC

The PCM detects there is no signal from the CKP sensor for 8 seconds.

Action Taken When the DTC Sets

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

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
Frame and updates the 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.

(DTC) List

System OK

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

Test Description

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

3: This step determines if the fault is present.

6: This step simulates a CKP sensor signal to the PCM. If the PCM receives the signal, the fuel pump will
operate for about two seconds.

DTC P0335

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

Attempt to start the engine.
Does the engine start and continue to run?

Go to Step 3

Go to Step 4

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 4

Go to Intermittent

Conditions

1. Turn ON the ignition, with the engine OFF.

2. Raise the vehicle. Refer to Lifting and

Jacking the Vehicle in General Information.

3. Disconnect the crankshaft position (CKP)

sensor harness connector.

4. Measure the voltage from the 12-volt

reference circuit of the CKP sensor to a good
ground with a DMM.

Is the voltage within the specified value?

B+

Go to Step 5

Go to Step 7

Measure the voltage between the 12-volt reference
circuit of the CKP sensor and the low reference
circuit of the CKP sensor with a DMM.
Is the voltage within the specified value?

B+

Go to Step 6

Go to Step 8

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

Momentarily connect a test lamp between the CKP
sensor signal circuit and the 12-volt reference of the
CKP sensor.
Does the fuel pump operate when the test lamp is
applied to the CKP sensor signal circuit?

Go to Step 10

Go to Step 9

Test the 12-volt reference circuit for the following
conditions:

An open

High resistance

A short to ground

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct condition?

Go to Step 16

Go to Step 12

Test the low reference circuit for the following
conditions:

An open

High Resistance

A short to voltage

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 16

Go to Step 12

Test the CKP sensor signal circuit for the following
conditions:

High resistance

An open

A short to ground

A short to voltage

Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 16

Go to Step 12

1. Remove the CKP sensor. Refer to

Crankshaft Position (CKP) Sensor
Replacement .

2. Visually inspect the CKP sensor for the

following conditions:

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

Physical damage

Loose or improper installation

Wiring routed too closely to the
secondary ignition components

3. The following conditions may cause this DTC

to set:

Excessive air gap between the CKP
sensor and the reluctor wheel

The CKP sensor coming in contact with
the reluctor wheel

Foreign material passing between the
CKP sensor and the reluctor wheel

Insufficient fuel

Did you find and correct the condition?

Go to Step 16

Go to Step 11

Visually inspect the CKP sensor reluctor wheel for
the following conditions:

Physical damage

Excessive play or looseness

Refer to Crankshaft and Bearings Cleaning and
Inspection in Engine Mechanical.
Did you find and correct the condition?

Go to Step 16

Go to Step 14

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

Go to Step 16

Go to Step 13

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

Go to Step 16

Go to Step 15

Replace the CKP sensor. Refer to Crankshaft
Position (CKP) Sensor Replacement .
Did you complete the replacement?

Go to Step 16

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

Go to Step 16

1. Clear the DTCs with a scan tool.

2. Turn OFF the ignition for 30 seconds.

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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