P0342

Diagnostic Chart:

Schematic:

The camshaft position (CMP) sensor is a hall effect switching device used to determine the position of the bank 2 exhaust camshaft. The CMP sensor detects a single tooth on the reluctor wheel of the camshaft, which denotes 90° before top dead center cylinder # 1 compression stroke. The ECM expects the CMP sensor signal to be low (0 volts) as the single tooth on the reluctor wheel passes the sensor, and high (12 volts) during the remainder of the reluctor rotation. The ECM monitors the CMP sensor signal in groups of eight crankshaft rotations. It expects to see one transition from high to low every two crankshaft revolutions. A normal pattern with engine running would be 01010101 or 10101010 where a logic '1' means high, and a logic '0' means low. With both CKP sensor and CMP sensor inputs, the ECM can properly synchronize ignition timing, fuel delivery and spark knock control. DTC P0342 sets when the CMP sensor signal voltage at the ECM is continuously low for a certain number of crankshaft revolutions.

DTC PARAMETERS
DTC P0342 will set if CMP sensor signal voltage is continuously low within an eight crankshaft revolution test when:
^ Condition exists for 12 or more consecutive or non-consecutive tests during the ignition cycle
^ Engine speed is greater than 20 rpm

DTC P0342 diagnostic runs continuously with engine running or cranking.

P0342 is a type B DTC.

DIAGNOSTIC AIDS
To locate the intermittent problem, use Scan tool to monitor CMP ACTIVE COUNTER with engine running. The counter will continuously count up from 0 to 255 then reset to 0 if pulses are being received correctly. If any circuit fault is occurring the CMP sensor signal will not change and the counter will stop counting.

The CMP, ECT and MAF sensors share the same sensor return circuit 2761.

IMPORTANT: The ECM will default to non-sequential fuel injection and will fire both mating cylinder spark plugs if the CMP sensor signal is lost. Therefore, the engine will start and run if the CMP sensor signal is lost.