DTC P0342. Chevrolet Optra 2005

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Controls - 1.4L DOHC 🢒 DTC P0342

Circuit Description

The camshaft position (CMP) sensor is used to correlate crankshaft to camshaft position so that the engine control module (ECM) can determine which cylinder is ready to be fueled by the injector. The CMP is also used to determine which cylinder is misfiring when a misfire is present. When the ECM cannot use the information from the CMP sensor, a diagnostic trouble code (DTC) is set, and the ECM will fuel the engine using the alternating synchronous double fire (ASDF) method.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0342 Camshaft Position (CMP) Sensor Low Voltage

Conditions for Running the DTC

•	The engine is running.

•	DTC P0342 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects no CMP pulses in 32 camshaft rotations.

Action Taken When the DTC Sets

•	The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

•	The control module records the operating conditions at the time then the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

Conditions for Clearing the MIL/DTC

•	The control module turns OFF the malfunction indicator lamp (MIL) after 4 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

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls Connector End Views

Did you perform the Diagnostic System Check - Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Start the engine
Observe the DTC Information with a scan tool.

Did DTC P0342 fail this ignition?

Go to Step 4

Go to Step 3

Observe the Freeze Frame/Failure Records for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
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

Turn OFF the ignition.
Disconnect the camshaft position (CMP) sensor harness connector.
Turn ON the ignition with the engine OFF.

Important: Use the J 35616-200 Test Lamp Kit for this test. If the J 35616-200 is not available, use a test lamp that measures between 25-30 ohms.

Probe the ignition 1 voltage circuit of the CMP sensor with a test lamp connected to a good ground.
Measure the voltage from the probe of the test lamp to a good ground.

Is the voltage within 0.6 volts of the specified value?

B+

Go to Step 5

Go to Step 12

Connect a test lamp between the ignition 1 voltage circuit and the low reference circuit of the CMP sensor.

Does the test lamp illuminate?

Go to Step 6

Go to Step 13

Measure the voltage from the signal circuit of the CMP sensor to a good ground with a DMM.

Is the voltage within the specified range?

4.8-5.2V

Go to Step 8

Go to Step 7

Test the signal circuit of the CMP sensor for the following conditions:

•	High resistance

•

An open

•	A short to ground

•	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 11

Remove the CMP sensor. Refer to Camshaft Position Sensor Replacement .
Inspect the CMP sensor for the following conditions:

•	Physical damage

•	Loose or improper installation

•	Wiring routed too closely to the secondary ignition components

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

•	The CMP sensor coming in contact with the reluctor wheel

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

Did you find and correct the condition?

Go to Step 16

Go to Step 9

Important: If the reluctor wheel is damaged, replace the CMP sensor.

Inspect the CMP sensor reluctor wheel for the following conditions:

•	Physical damage

•	Improper installation

•	Excessive play or looseness

Did you find and correct the condition?

Go to Step 16

Go to Step 10

Test for an intermittent and for a poor connection at the CMP 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 16

Go to Step 14

Test for an intermittent and for a poor connection at the ECM. 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 16

Go to Step 15

Repair the ignition 1 voltage circuit of the CMP sensor for one of the following conditions:

•

An open

•	A short to ground

•	High resistance

Replace the fuse as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Repair the low reference circuit of the CMP sensor for one of the following conditions:

•

An open

•	High resistance

Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 16

Replace the CMP sensor. Refer to Camshaft Position Sensor Replacement .

Did you complete the replacement?

Go to Step 16

Replace the ECM. Refer to Engine Control Module Replacement .

Did you complete the replacement?

Go to Step 16

Clear the DTCs with a scan tool.
Turn OFF the ignition for 30 seconds.
Start the engine.
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 17

Observe the Capture Info with a scan tool.

Are there any DTCs that have not been diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK