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No Response From Pcm With A No-Start Condition: Testing

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The DRBIII(R) scan tool and cable must be operating properly for the results of this test to be valid. Ensure the ignition switch was on-when trying to communicate with the PCM.
    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  1. Turn the ignition off. Disconnect the PCM harness connector. Using a 12-volt test light connected to ground, probe the (A14) PCM fused B+ circuit in the PCM harness connector. See Figure or Figure . Does the test light illuminate brightly? If yes, go to next step. If no, repair the open or short to ground in the (A14) fused B+ circuit. Inspect and replace fuses as necessary.
    2. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  2. Ignition on, engine not running. Using a 12-volt test light connected to ground, probe the (F18) PCM fused ignition switch output circuit in the PCM harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open or short to ground in the (F18) ignition switch output circuit. Inspect and replace fuses as necessary.
    3. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  3. Turn the ignition off. Using a 12-volt test light connected to battery voltage, probe the (Z12) PCM ground circuits in the PCM harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the open in the (Z12) PCM ground circuits.
  4. Connect the PCM harness connectors. Disconnect the TP sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K7) 5-volt supply circuit at TP sensor harness connector, see Fig 1 . Is the voltage 4.5-5.2 volts? If yes, go to next step. If no, go to step  6 .
  5. Turn the ignition off. Disconnect the MAP sensor harness connector. Connect the TP sensor harness connector. Ignition on, engine not running. Measure the voltage on the (K7) 5-volt supply circuit in the MAP sensor harness connector, see Fig 2 or Fig 3 . Is the voltage 4.5-5.2 volts? If yes, go to step  9 . If no, replace TP sensor.
  6. Measure the voltage on the (K7) 5-volt supply circuit. Disconnect all the sensors that use the (K7) 5-volt supply circuit while monitoring the (K7) voltage in the TP sensor harness connector. Did the voltage return to 4.5-5.2 volts when disconnecting any of the sensors. If yes, replace the sensor that is pulling down the 5-volt supply. If no, go to next step.
  7. Turn the ignition off. Disconnect all the sensors that share the (K7) 5-volt supply circuit. Measure the resistance between ground and the (K7) 5-volt supply circuit with all the sensor harness connectors disconnected. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K7) 5-volt supply circuit. If no, go to next step.
  8. Disconnect all sensors that use the (K6) 5-volt supply. Measure the resistance between ground and the (K6) 5-volt supply circuit at the PCM harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K6) 5-volt supply circuit. If no, go to next step.
  9. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See REMOVAL & INSTALLATION - DAKOTA article.
Fig 1: Identifying Throttle Position Sensor Harness Connector Terminals
G00235016Courtesy of CHRYSLER CORP.
Fig 2: Identifying Manifold Absolute Pressure Sensor Harness Connector Terminals
G00235072Courtesy of CHRYSLER CORP.
Fig 3: Identifying Manifold Absolute Pressure Sensor Harness Connector Terminals
G00234994Courtesy of CHRYSLER CORP.
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