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Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read the active DTCs.

      Is the DTC active?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the MAP Sensor harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector.

      Is the voltage between 4.8 to 5.2 volts?

      Yes 

      • Go To  3

      No 

      • Go To  7
  3. MAP SENSOR 
    1. With the scan tool, monitor the MAP Sensor voltage with the Sensor harness connector disconnected.

      Is the voltage above 2.2 volts?

      Yes 

      No 

      • Go To  4
  4. CHECK THE (K1) MAP SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    3. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    4. Measure the resistance of the (K1) MAP Signal circuit from the MAP Sensor harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (K1) MAP Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. CHECK FOR THE (K1) MAP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    1. Check for continuity between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

      Is there continuity between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit?

      No 

      • Go To  6

      Yes 

      • Repair the short between the (K900) Sensor ground circuit and the (K1) MAP Signal circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (K1) MAP SIGNAL CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (K1) MAP Signal circuit in the MAP Sensor harness connector.

      Is there continuity between ground and the (K1) MAP Signal circuit?

      No 

      • Go To  10

      Yes 

      • Repair the (K1) MAP Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Turn the ignition on.
    4. Measure the voltage between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  8
  8. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
      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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    2. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
    3. Measure the resistance of the (F856) 5-Volt Supply circuit from the MAP Sensor harness connector to the GPEC Adaptor.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (F856) 5-Volt Supply circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. CHECK THE (F856) 5-VOLT SUPPLY CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (F856) 5-Volt Supply circuit in the MAP Sensor harness connector.

      Is there continuity between ground and the (F856) 5-Volt Supply circuit?

      No 

      • Go To  10

      Yes 

      • Repair the (F856) 5-Volt Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  10. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the MAP Sensor and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the MAP Sensor and Powertrain Control Module connectors.
    4. Perform any Service Bulletins that may apply.

      Were there any problems found?

      Yes 

      No 

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