The ECM is not seeing any signal from any of the cam sensors at all.
Description and flow chart below.
Roy
DTC P0343
CIRCUIT 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 the CMP signal voltage is more than a predetermined voltage, within a certain number of crankshaft revolutions, this DTC sets.
DTC DESCRIPTORS
This diagnostic procedure supports the following DTCs:
DTC P0343 Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0348 Intake Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
DTC P0368 Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 1
DTC P0393 Exhaust Camshaft Position (CMP) Sensor Circuit High Voltage Bank 2
CONDITIONS FOR RUNNING THE DTC
The engine is operating.
DTCs P0343, P0348, P0368, P0393 run continuously once the engine is operating.
CONDITIONS FOR SETTING THE DTC
The CMP sensor signal voltage is always high and the ECM detects no pulses from the CMP sensor.
ACTION TAKEN WHEN THE DTC SETS
The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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.
DIAGNOSTIC AIDS
Use the J 35616-B Connector Test Adapter Kit for any test that requires probing the ECM harness connector or a component harness connector.
The lower connector of the ECM is connector C1 and the upper connector of the ECM is connector C2. Refer to Computers and Control Systems Component Views.
For an intermittent condition, refer to Intermittent Conditions. See: Computers and Control Systems > Initial Inspection and Diagnostic Overview > Intermittent Conditions
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines that the condition is present.
4. This step tests the signal circuit of the CMP sensor. This circuit is pulled-up to about 5 volts.
5. The ECM produces a measurable steady-state amperage that provides the 5-volt reference to the CMP sensors. If the amperage on the 5-voltreference circuit is less than the specified value, test for a condition in the 5-volt reference circuit.
6. This step tests for high resistance in the low reference circuit of the CMP sensors. The ECM must be completely powered down to obtain an accurate resistance reading. It may take up to 30 minutes for the ECM to power down after the ignition key is removed. Removal of the ECM/TCM fuse allows the ECM to power down completely.
Monday, December 2nd, 2019 AT 6:33 AM
