GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Terraza - 4WD 🢒 Engine 🢒 Engine Controls - 3.5L (LX9) 🢒 DTC P0336

Circuit Description

The crankshaft position (CKP) sensor is a 24X sensor. The CKP sensor provides 24 digital ON/OFF signals to the powertrain control module (PCM) per revolution of the crankshaft. This information is used by the PCM for ignition timing, fuel injector timing, misfire diagnostics, and tachometer display. The PCM supplies 12 volts to the sensor on the 12-volt reference circuit and provides a ground on the low reference circuit. The CKP sensor provides signals to the PCM on the medium resolution engine speed signal circuit. The PCM monitors the CKP sensor for errors. If the PCM receives an inconsistent signal form the CKP sensor, DTC P0336 sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0336 Crankshaft Position (CKP) Sensor Performance

Conditions for Running the DTC
    • The engine is cranking or running.
    • This diagnostic runs continuously once the above conditions are met.

Conditions for Setting the DTC
    • The PCM detects that more or less than 48 CKP sensor pulses have occurred for every one camshaft position (CMP) sensor pulse.
    • This conditions exists for more than 2 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.

Step

Action

Values

Yes

No

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views or Powertrain Control Module Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Observe the DTC Info with a scan tool.

Is DTC P0335 also set?

--

Go to DTC P0335

Go to Step 3

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 OFF the ignition.
  2. Inspect all of the crankshaft position sensor (CKP) circuits for the following conditions:
    3. • Wiring routed too closely to secondary ignition wires or components
    • Wiring routed too closely to after-market add-on electrical equipment
    • Wiring routed to closely to solenoids, relays, and motors
    • Electromagnetic interference in the CKP sensor circuits

Did you find and correct the condition?

--

Go to Step 19

Go to Step 5

5
  1. Turn ON the ignition, with the engine OFF.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Test for an intermittent and for a poor connection at the CKP sensor. 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 19

Go to Step 6

6
  1. Disconnect the CKP sensor.
  2. Measure the voltage from the 12-volt reference circuit of the CKP sensor to a good ground with a DMM.

Is the voltage measured within 1 volt of the specified value?

B+

Go to Step 7

Go to Step 16

7
  1. Turn OFF any electrical loads or accessories.
  2. Measure the amperage between the 12-volt reference circuit and the low reference circuit of the CKP sensor with a DMM.

Is the amperage more than the specified value?

250 mA

Go to Step 8

Go to Step 12

8

Test the 12-volt reference circuit for an intermittent condition or shorted to other circuits. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 9

9

Test the low reference circuit for an intermittent condition. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 10

10

Test the medium resolution engine speed signal circuit for an intermittent condition. Refer to Testing for Electrical Intermittents and Inducing Intermittent Fault Conditions in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 11

11

Test for an intermittent and for a poor connection at the powertrain control module (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 19

Go to Step 14

12

Test the 12-volt reference circuit of the CKP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 13

13

Test the low reference circuit of the CKP sensor for high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 16

14
  1. Remove the CKP sensor. Refer to Crankshaft Position Sensor Replacement .
  2. Inspect the CKP sensor for the following conditions:
    3. • Physical damage
    • Improper installation
    • Excessive play or looseness
    • Excessive air gap between the CKP sensor and 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 19

Go to Step 15

15

Inspect the reluctor wheel for the following conditions:

    • Physical damage
    • Improper installation
    • Excessive endplay or looseness

Refer to Crankshaft and Bearing Cleaning and Inspection in Engine Mechanical.

Did you find and correct the condition?

--

Go to Step 19

Go to Step 17

16

Test for an intermittent and for a poor connection at the 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 19

Go to Step 18

17

Replace the CKP sensor. Refer to Crankshaft Position Sensor Replacement .

Did you complete the replacement?

--

Go to Step 19

--

18

Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 19

--

19
  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 20

20

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information

System OK