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 Descriptors

DTC P0341: Intake Camshaft Position (CMP) Sensor Performance Bank 1
DTC P0342: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1
DTC P0343: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0346: Intake Camshaft Position (CMP) Sensor Performance Bank 2
DTC P0347: Intake Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2
DTC P0348: Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
DTC P0366: Exhaust Camshaft Position (CMP) Sensor Performance Bank 1
DTC P0367: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 1
DTC P0368: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0391: Exhaust Camshaft Position (CMP) Sensor Performance Bank 2
DTC P0392: Exhaust Camshaft Position (CMP) Sensor Circuit Low Voltage Bank 2
DTC P0393: Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
CMP Sensor 5-Volt Reference | P0343, P0348, P0368, P0393, P0652, P2122, P2138 | P0343, P0348, P0368, P0393, P0651 | P0653, P2123, P2138 | P0341, P0346, P0366, P0391, P0651, P0652, P0653, P2138
CMP Sensor Signal Intake Bank 1 | P0342 | P0343 | P0343 | P0341
CMP Sensor Signal Intake Bank 2 | P0347 | P0348 | P0348 | P0346
CMP Sensor Signal Exhaust Bank 1 | P0367 | P0368 | P0368 | P0366
CMP Sensor Signal Exhaust Bank 2 | P0392 | P0393 | P0393 | P0391
Low Reference | -- | P0343, P0348, P0368, P0393 | -- | P0341, P0346, P0366, P0391

### Circuit/System Description

Each camshaft is equipped with a camshaft position (CMP) sensor that the engine control module (ECM) monitors. The CMP sensor is a hall effect switch that works in conjunction with a 4X reluctor wheel. The reluctor wheels are mounted to the camshaft position actuators that are mounted to the end of the camshafts. The ECM uses the CMP sensor signals in order to determine the position of the camshafts. The ECM supplies 5 volts to the CMP sensors on the 5-volt reference circuits, and supplies a ground on the low reference circuits. The CMP sensors provide a signal to the ECM on the signal circuits. If the ECM detects extra or missing CMP sensor signal transitions, or a signal voltage that is more or less than the predetermined range, within a certain number of crankshaft revolutions, one of these DTCs sets.

### Conditions for Running the DTC

• | The ECM detects greater than 10 crankshaft revolutions.

• | The engine speed is less than 2,520 RPM.

• | The DTCs run continuously once the above condition is met.

### Conditions for Setting the DTC

#### P0341, P0346, P0366, P0391

• | The ECM detects a signal from the CMP sensor, but the number of pulses are less than or greater than what is expected for one crankshaft revolution.

| OR

• | The CMP sensor does NOT correlate to the crankshaft position.

• | Either condition must exist for greater than 1 second, or cumulative of 10 seconds.

#### P0342, P0347, P0367, P0392

The CMP sensor signal voltage is always low and the ECM detects no pulses from the CMP sensor for greater than 1 second, or cumulative of 10 seconds.

#### P0343, P0348, P0368, P0393

The CMP sensor signal voltage is always high and the ECM detects no pulses from the CMP sensor for greater than 1 second or cumulative of 10 seconds.

### Action Taken When the DTC Sets

DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, and P0393 are Type B DTCs.

### Conditions for Clearing the DTC

DTCs P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, and P0393 are Type B DTCs.

### Diagnostic Aids

The following conditions can also set the DTC:

• | Physical damage to the CMP sensor or the reluctor wheel

• | Excessive play or looseness of the CMP sensor or the reluctor wheel

• | Improper installation of the CMP sensor or the reluctor wheel

• | Foreign material passing between the CMP sensor and the reluctor wheel

• | Excessive air gap between the CMP sensor and the reluctor wheel

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Camshaft Actuator 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

### Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. DTC P0651, P0652 or P0653 should not be set.

⇒ | If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699.

2. Engine idling, observe the DTC information with a scan tool. DTC P0341, P0342, P0343, P0346, P0347, P0348, P0366, P0367, P0368, P0391, P0392, or P0393 should not set.
3. 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

1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the ECM.
2. Disconnect the harness connector at the appropriate CMP sensor.

Note: The control module or the sensor may be damaged if the circuit is shorted to B+ voltage.

3. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance or for a short to voltage. If the circuit/connections test normal, replace the ECM.

4. Install the fuse that supplies B+ to terminal 56-X2 of the ECM.
5. Ignition ON, test for greater than 4.8 V between the 5-volt reference circuit terminal 3 and ground.

⇒ | If less than the specified value, test the 5-volt reference circuit for an open/high resistance. If the circuits/connections test normal, replace the ECM.

6. Test for 4.8-5.2 V between the signal circuit terminal 2 and ground.

⇒ | If greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the ECM.

⇒ | If less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If circuit/connections test normal, replace the ECM.

7. If all circuits/connections test normal, replace the CMP sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Camshaft Position Sensor Replacement - Bank 2 (Left Side) Exhaust

• | Camshaft Position Sensor Replacement - Bank 2 (Left Side) Intake

• | Camshaft Position Sensor Replacement - Bank 1 (Right Side) Exhaust

• | Camshaft Position Sensor Replacement - Bank 1 (Right Side) Intake

• | Control Module References for engine control module replacement, setup, and programming