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For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2000 🢒 S/T Isuzu - 4WD 🢒 Engine 🢒 Engine Controls - 2.2L 🢒 DTC P0342 Camshaft Position (CMP) Sensor Circuit Low Voltage

Object Number: 52877 Size: SF
Engine Controls Components
Ignition Controls
OBD II Symbol Description Notice
Powertrain Control Module Connector End Views
Handling ESD Sensitive Parts Notice

Circuit Description

The camshaft position (CMP) sensor indicates the camshaft position so the powertrain control module (PCM) can determine which cylinder is misfiring when a misfire is present. Whenever the PCM receives an intermittent signal from the CMP, then the CMP activity counter will increment. In order to set a DTC, the PCM must see a minimum number of resync's within a maximum time.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The CMP active counter is not incrementing.

Action Taken When the DTC Sets
    • The control module illuminates the malfunction indicator lamp (MIL) if a failure is detected during 2 consecutive key cycles.
    • The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame and Failure Records.

Conditions for Clearing the MIL/DTC
    • The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.
    • A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles (coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant temperature is more than 70°C (158°F) during the same ignition cycle).
    • Use a scan tool to clear the DTCs.

Diagnostic Aids
    • An intermittent problem may be caused by the following conditions:
       - A poor connection
       - Rubbed through wire insulation
       - A broken wire inside the insulation
    • Any circuitry that is suspected of causing the intermittent complaint should be thoroughly inspected for the following conditions:
       - Proper mating
       - Broken locks
       - Improperly formed or damaged terminals
       - Physical damage to the wiring harness
    • Whenever the PCM sees less than 15 resyncs in 256 seconds, the counter resets to 0. Anytime a poor connection is present, the cam sensor reference activity counter stops incrementing and the cam sensor resync counter starts to increment.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. This step determines if the DTC P0342 is the result of a hard malfunction or an intermittent condition.

    2.

  2. This step determines if the voltage is available to the CMP sensor through the PCM.

    3.

  3. This step determines if the voltage is available to the CMP sensor through the PCM.

    4.

  4. This step tests for a signal from the CMP sensor. It is necessary to supply B+ to the CMP sensor ignition positive voltage terminal in order for the CMP sensor to have B+ supplied to the CMP sensor. While cranking the engine, the CMP sensor will send a varying voltage signal that can be read by the DMM as a frequency.

    5.

  5. The replacement PCM must be programmed and the Crankshaft Position System Variation Learning procedure must be performed.

Step

Action

Values

Yes

No

1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?

--

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

2

  1. Start and idle the engine.
  2. With the scan tool, observe the CMP Active counter.

Is the CMP active counter incrementing?

--

Go to Step 3

Go to Step 4

3

Operate the vehicle within the Freeze Frame conditions and Conditions for Running the DTC as specified in the supporting text.

Is the CMP active counter incrementing?

--

Go to Diagnostic Aids

Go to Step 4

4

  1. Turn ON the ignition, with the engine OFF.
  2. Disconnect the camshaft position (CMP) sensor connector.
  3. Connect a test lamp to ground.
  4. Probe the battery positive voltage circuit at the connector.

Did the test lamp illuminate?

--

Go to Step 5

Go to Step 6

5

  1. Connect a test lamp to B+.
  2. Probe the CMP harness connector ground circuit.

Did the test lamp illuminate?

--

Go to Step 7

Go to Step 8

6
  1. Inspect/Test for the following conditions on the CMP battery positive voltage circuit:
    2. • Poor connection
    • Open
    • Short to ground
  2. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 15

7

  1. Connect a fused jumper wire between each of the corresponding terminals between the CMP sensor and connector.
  2. Remove the fuel pump fuse.
  3. Connect a DMM to ground and set on Hz scale.
  4. Probe the CMP signal circuit of the CMP sensor.
  5. Crank the engine and observe the DMM.

Does the DMM display a frequency reading that is varying between the specified values?

0.5-2.6 Hz

Go to Step 9

Go to Step 14

8
  1. Inspect/Test for the following conditions on the CMP ground circuit:
    2. • Poor connection
    • Open
  2. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 15

9
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C1.
  3. Remove all the fused jumper wires.
  4. Connect a test lamp to ground.
  5. Turn ON the ignition, with the engine OFF.
  6. Probe the CMP sensor signal circuit at the CMP sensor connector with the test lamp.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 10

10
  1. Connect a test lamp to B+.
  2. Probe the CMP sensor signal circuit at the CMP sensor connector with the test lamp.

Does the test lamp illuminate?

--

Go to Step 13

Go to Step 11

11
  1. Inspect/Test the CMP sensor signal circuit for the following conditions:
    2. • Poor connection
    • Open
  2. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 15

12
  1. Turn OFF the ignition.
  2. Repair the short to voltage in the CMP signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

--

13
  1. Turn OFF the ignition.
  2. Repair the short to ground in the CMP signal circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 18

--

14
  1. Turn OFF the ignition.
  2. Inspect for a poor connection at the CMP sensor connector.
  3. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 16

15
  1. Turn OFF the ignition.
  2. Inspect for a poor connection at the PCM connector.
  3. If a problem is found, repair as necessary. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 18

Go to Step 17

16

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

Did you complete the replacement?

--

Go to Step 18

--

17

Important:: The replacement PCM must be programmed.

Replace the PCM. Refer to Powertrain Control Module Replacement/Programming .

Did you complete the replacement?

--

Go to Step 18

--

18
  1. Install the fuel pump fuse if still removed.
  2. Reconnect the CMP connector if still disconnected.
  3. Use a scan tool to clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK