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 Instructionsprovide an overview of each diagnostic category.

### DTC Descriptor

DTC P0335 00: Crankshaft Position Sensor Circuit
DTC P0336 00: Crankshaft Position Sensor Performance

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Crankshaft Position Sensor 5-Volt Reference Circuit | P0335 00, P0651 00 | P0335 00 | P0335 00, P0651 00 | P0336 00
Crankshaft Position Sensor Signal | P0335 00 | P0335 00 | P0335 00 | P0336 00
Low Reference | -- | P0335 00 | -- | P0336 00

### Circuit/System Description

The crankshaft position sensor signal detects crankshaft speed and position. The crankshaft position sensor produces an AC voltage of different amplitude and frequency. The frequency depends on the velocity of the crankshaft, and the AC voltage output depends on the crankshaft position and battery voltage. The crankshaft position sensor works in conjunction with a 58X reluctor wheel attached to the crankshaft. The engine control module (ECM) can synchronize the ignition timing, fuel injector timing, and spark knock control based on the crankshaft position sensor and the camshaft position sensor inputs. The crankshaft position sensor is also used to detect misfire and tachometer display.

### Conditions for Running the DTC

• | DTCs P0101 00, P0102 00, P0103 00, P0365 00, P0366 00, P0641 00, and P0651 00 are not set

• | The engine is cranking or running.

• | The airflow into the engine is greater than 3 g/s.

• | The DTCs run continuously once the above conditions are met.

### Conditions for Setting the DTC

DTC P0335 00 sets if one of the following conditions occur:

• | The ECM detects that the engine has been cranking for greater than 15 s without a crankshaft position sensor pulse.

• | The engine is operating and the ECM does not detect a crankshaft position sensor pulse for 10 s.

DTC P0336 00 sets if one of the following conditions occur:

• | The ECM detects that the engine has been cranking for greater than 1.5 s without detecting the synchronization gap on the reluctor wheel.

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

• | The ECM detects that the engine is running without detecting the synchronization gap on the reluctor wheel.

• | The ECM detects that the engine is running, but receives less than 51 or greater than 65 crankshaft position sensor pulses, during one engine revolution.

### Action Taken When the DTC Sets

• | DTCs P0335 00 and P0336 00 are Type B DTCs.

• | The ECM will use the camshaft position sensor for engine operation.

### Conditions for Clearing the DTC

DTCs P0335 00 and P0336 00 are Type B DTCs.

### Diagnostic Aids

The following conditions could also set the DTCs:

• | Physical damage to the crankshaft position sensor or the reluctor wheel

• | Excessive play or looseness of the crankshaft position sensor or the reluctor wheel

• | Improper installation of the crankshaft position sensor or the reluctor wheel

• | Foreign material passing between the crankshaft position sensor and the reluctor wheel

• | Excessive air gap between the crankshaft position sensor and the reluctor wheel

• | If there is a condition with the crankshaft position sensor, the tachometer will be inoperative

• | The crankshaft position sensor may be out of range after a hot soak. Review the freeze frame or failure records for engine coolant temperature when the DTC set.

• | The ECM uses the camshaft position sensors to determine engine speed and position when there is a crankshaft position sensor condition.

### 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 diagnostic tester information

### Circuit/System Verification

Note: If you were sent here from engine cranks but does not run proceed to circuit/system testing.

1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0651 00 is not set.

⇒ | If DTC P0651 00 is set, refer to LINK 185432 for further diagnosis.

2. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335 00 and P0336 00 should not set.
3. Engine cranking, observe the scan tool Engine Speed parameter. The scan tool should indicate an engine speed greater than 0 RPM.
4. Move related harnesses/connectors of the B26 Crankshaft Position (CKP) Sensor and verify the engine does not stumble, stall, or change engine speed.

⇒ | If the above condition exists, repair the harness/connectors as necessary.

5. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

### Circuit/System Testing

Note: If the B26 Crankshaft Position (CKP) Sensor lead is damaged in any way, replace the B26 Crankshaft Position (CKP) Sensor.

1. Ignition OFF, disconnect the harness connector at the B26 Crankshaft Position (CKP) Sensor.
2. Test for less than 5 Ω between the low reference circuit terminal 2 and ground

⇒ | If greater than the specified range, test the circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

3. Ignition ON, test for 4.8 to 5.2 V between the 5-volt reference circuit terminal 3 and ground.

⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

4. Test for 4.8 to 5.2 V between the signal circuit terminal 1 and ground.

⇒ | If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module (ECM).

⇒ | If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module (ECM)..

5. Ignition OFF, connect a 3 A fused jumper wire to the B26 Crankshaft Position (CKP) Sensor signal circuit terminal 1.
6. Ignition ON, momentarily touch the end of the fused jumper wire to ground while monitoring the scan tool Crankshaft Position Active Counter. The Crankshaft Position Active Counter should increment.

⇒ | If the Crankshaft Position Active Counter does not increment, replace the K20 Engine Control Module (ECM).

7. If all circuits test normal, replace the B26 Crankshaft Position (CKP) Sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Crankshaft Position Sensor Replacement

• | Control Module References for Engine Control Module replacement, setup, and programming