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Home >> Isuzu >> 1999 >> Trooper Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Trouble Code Identification >> DTC P0341: Camshaft Position (CMP) Sensor Circuit Performance >> Diagnostic Aids

Diagnostic Aids

An intermittent may be caused by a poor connection, rubbed-through wire insulation or a broken wire inside insulation. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wire connection, and damaged harness. Disconnect PCM connector. Connect voltmeter to CMP signal circuit and wiggle harness and connectors. A change in voltage will indicate area of problem. If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC DIAGNOSTIC PROCEDURES article. Read and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set. Go to next step.
  2. Turn ignition on. Using scan tool, read and record FAIL RECORDS data for DTC P0341. Operate vehicle within FAILURE RECORDS conditions. Using scan tool, read SPECIFIC DTC. If scan tool displays DTC P0341 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0341 FAILED THIS IGN, check for an intermittent problem. See DIAGNOSTIC AIDS .
  3. Disconnect CMP sensor. Measure voltage between sensor ground circuit (Green wire) and sensor voltage reference circuit (Yellow/Red wire) at CMP sensor harness connector. If reading is 4-6 volts, go to next step. If reading is not 4-6 volts, go to step  5.
  4. Measure voltage between CMP sensor signal circuit (Blue wire on 3.2L, or Blue and White wires on 3.5L) and sensor ground circuit (Green wire) at CMP sensor harness connector. If reading is 4-6 volts, go to step  11. If reading is not 4-6 volts, go to step  8.
  5. If voltage measured in step 3)  was less than 4-6 volts, go to next step. If voltage in step  3 was greater than 4-6 volts, repair short to power in CMP sensor voltage reference circuit. Retest system.
  6. Inspect CMP sensor for poor connection. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  7. Turn ignition off. Disconnect PCM and CMP sensor harness connectors. Inspect sensor voltage reference circuits (Yellow/Red wire) for an open between ignition control module and CMP sensor. If a problem is found, repair as necessary. Retest system. If no problem is found, go to step  9.
  8. Turn ignition off. Disconnect PCM harness connectors and leave CMP sensor disconnected. Turn ignition on. Using a DVOM, check CMP sensor signal circuit (Blue wire on 3.2L, or Blue and White wires on 3.5L) for an open or short to power. Check CMP sensor input circuit for a short to ground. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  9. Check for an open or short in CMP sensor ground circuit. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  10. Check for poor connection at PCM. If a problem is found, repair as necessary. Retest system. If no problem is found, go to next step.
  11. Reconnect PCM and CMP sensor harness connectors. Using a voltmeter, backprobe sensor connector at CMP signal circuit (Blue wire on 3.2L, or Blue and White wires on 3.5L). Crank engine and monitor voltage. If voltage toggles between zero and 4 volts, replace PCM. Retest system. If voltage does not toggle between zero and 4 volts, leave voltmeter connected and go to next step.
  12. Leaving sensor wiring harness connected, remove CMP sensor. Place a magnet on CMP sensor large enough to cover face of sensor. If voltmeter reads about zero volts, replace faulty or missing sensor magnet. If voltmeter does not read about zero volts, replace CMP sensor. Retest system.
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