Hummer H2. Manual — part 1652
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:
z
The 12-volt reference circuit
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The low reference circuit
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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
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DTCs P0101, P0102, P0103, P0341, P0342, or P0343 are not set.
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The camshaft position (CMP) sensor signal is incrementing.
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The mass air flow (MAF) is more than 3 g/s.
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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
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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
Frame and updates the Failure Records.
Conditions for Clearing the MIL/DTC
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The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles
that the diagnostic runs and does not fail.
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A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
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A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other
emission related diagnostic.
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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
No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End 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
Attempt to start the engine.
Does the engine start and continue to run?
-
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. 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
4
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
5
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
6
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
7
Test the 12-volt reference circuit for the following
conditions:
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An open
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High resistance
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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
8
Test the low reference circuit for the following
conditions:
z
An open
z
High Resistance
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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
9
Test the CKP sensor signal circuit for the following
conditions:
z
High resistance
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An open
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A short to ground
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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
10
z
Physical damage
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Loose or improper installation
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Wiring routed too closely to the
secondary ignition components
3. The following conditions may cause this DTC
to set:
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Excessive air gap between the CKP
sensor and the reluctor wheel
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The CKP sensor coming in contact with
the reluctor wheel
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Foreign material passing between the
CKP sensor and the reluctor wheel
z
Insufficient fuel
Did you find and correct the condition?
-
Go to Step 16
Go to Step 11
11
Visually inspect the CKP sensor reluctor wheel for
the following conditions:
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Physical damage
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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
12
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
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
14
Replace the CKP sensor. Refer to Crankshaft
Position (CKP) Sensor Replacement .
Did you complete the replacement?
-
Go to Step 16
-
15
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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