For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC P0336: Crankshaft Position (CKP) Sensor Performance

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
5-Volt Reference Circuit | P0651 | P0335 | P0651, P2135 | --
CKP Sensor Signal Circuit | P0335 | P0335 | P0335 | P0336
Low Reference Circuit | -- | P0335 | P0335 | --

### Circuit/System Description

The crankshaft position (CKP) sensor circuits consist of an engine control module (ECM) supplied 5-volt reference circuit, low reference circuit and an output signal circuit. The CKP sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor detects magnetic flux changes between the peaks and valleys of a 58-tooth reluctor wheel on the crankshaft. Each tooth on the reluctor wheel is spaced at 60-tooth spacing, with 2 missing teeth for the reference gap. The CKP sensor produces an ON/OFF DC voltage of varying frequency, with 58 output pulses per crankshaft revolution. The frequency of the CKP sensor output depends on the velocity of the crankshaft. The CKP sensor sends a digital signal, which represents an image of the crankshaft reluctor wheel, to the ECM as each tooth on the wheel rotates past the CKP sensor. The ECM uses each CKP signal pulse to determine crankshaft speed and decodes the crankshaft reluctor wheel reference gap to identify crankshaft position. This information is then used to sequence the ignition timing and fuel injection events for the engine. The ECM also uses CKP sensor output information to determine the crankshaft relative position to the camshaft, to detect cylinder misfire, and to control the CMP actuator if equipped.

### Conditions for Running the DTC

• | DTC P0340, P0341, P0641, or P0651 is not set.

• | The engine is cranking or running.

• | DTC P0336 runs continuously when the above conditions are met.

### Conditions for Setting the DTC

Note: The ECM detects engine movement by sensing the airflow through the MAF sensor, when airflow is greater than 3 grams per second, or by sensing camshaft position (CMP) sensor pulses.

• | The ECM detects that the engine is running, but receives less than 53 or more than 63 CKP sensor pulses, during each engine revolution, for 8 of 10 engine revolutions.

• | The ECM detects that the engine is running, but more than 25 crankshaft resyncs have occurred within 20 seconds.

• | The ECM detects that the engine has been running, but the crankshaft does not sync for 0.4 second.

### Action Taken When the DTC Sets

• | DTC P0336 is a Type A DTC.

• | The CMP actuator if equipped is commanded to the parked position.

• | The ignition system defaults to a limp home mode. The CMP sensor is used to determine engine position.

### Conditions for Clearing the DTC

DTC P0336 is a Type A DTC.

### Diagnostic Aids

• | With this DTC set, the engine may crank for an extended period of time during start-up.

• | This test procedure requires that the vehicle battery has passed a load test and is completely charged. Refer to Battery Inspection/Test.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Electronic Ignition (EI) System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools

J 35616-A/BT-8637 Connector Test Adapter Kit

### Circuit/System Verification

1. Ignition OFF, inspect the engine wiring harness carrying the CKP sensor circuits for the following conditions:

• | Close routing of aftermarket electrical equipment.

• | Close to solenoids, motors, and relays.

⇒ | If any of these are determined to be a possible source of electrical interference, correct any wire harness routing or component placement conditions.

2. Start the engine. Using the live plot function on the scan tool, select the CMP sensor parameter. Change the minimum spec to 400, and the maximum spec to 4,000 RPM. Select the CKP sensor parameter. Change the minimum spec to 600, and the maximum spec to 3,300 RPM.
3. Observe the scan tool.
4. Quickly accelerate and release the accelerator pedal several times. Do not accelerate past 3,200 RPM. The graphed lines on the live plot display should track together across the screen.
5. 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 data.

### Circuit/System Testing

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Ignition OFF, inspect the CKP sensor for looseness and correct installation.

⇒ | If the CKP sensor is loose, inspect the sensor and the O-ring for damage, replace as necessary.

2. Inspect the engine for the following conditions:

• | Engine oil for debris and contamination

• | Crankshaft reluctor wheel for damage

• | The timing chain, tensioner, and sprockets for wear or damage

⇒ | If debris is found in the engine oil, inspect the internal engine components to determine the cause. Repair or replace any worn or damaged components.

### Component Testing

Note: You must perform the Circuit/System Testing before proceeding with Component Testing.

1. Inspect the CKP sensor for correct installation. Remove the CKP sensor from the engine and inspect the sensor O-ring for damage.

⇒ | If the sensor is loose, incorrectly installed, or damaged, replace the CKP sensor.

2. Connect the CKP sensor harness connector to the CKP sensor.
3. Ignition ON, engine OFF. Observe the CKP Active counter parameter on the scan tool.
4. Pass a flat steel object across the tip of the sensor repeatedly. The CKP Active counter parameter should increment with each pass of the steel object.

⇒ | If the parameter does not increment, replace the CKP sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Crankshaft Position Sensor Replacement

• | Engine Control Module Programming and Setup

• | Engine Control Module Replacement