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    P2609 No Voltage Drop Seen From Intake Air Heaters

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    Mopar1973Man

    P2609 NO VOLTAGE DROP SEEN FROM INTAKE AIR HEATERS

    When Monitored and Set Condition:

    When Monitored: First 15 seconds of engine operation.
    Set Condition: The ECM does not detect a voltage drop on the intake air heater circuit.

    POSSIBLE CAUSES

    • INTAKE AIR HEATER OPEN
    • INTAKE AIR HEATER GROUND OPEN
    • OPEN BATTERY CABLE FROM INTAKE AIR HEATER RELAY
    • BATTERY CABLE OPEN
    • #1 INTAKE AIR HEATER RELAY
    • #2 INTAKE AIR HEATER RELAY
    • INTERMITTENT CONDITION

    DIAGNOSTIC PROCEDURE

    NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

    1. Measure the resistance between the intake air heater supply and ground terminal on each intake air heater. Is the resistance less than 10 Ohms?
      Yes --> Go To 2
      No --> Replace the open Intake Air Heater.
    2. Measure the resistance of the intake air heater ground circuit between the intake air heater terminal and the intake manifold cover ground connection. Is the resistance less than 10 Ohms?
      Yes --> Go To 3
      No --> Repair the open Intake Air heater ground.
    3. Measure the resistance of the battery cable between the intake air heater and the intake air heater relay for both intake air heaters. Is the resistance less than 10 Ohms?
      Yes --> Go To 4
      No --> Repair The open or high resistance battery cable from the intake heater relay to heater.
    4. Measure the resistance of the battery cable between the battery and the intake air heater relay for both relays. Is the resistance less than 10 Ohms?
      Yes --> Go To 5
      No --> Replace the battery cable from the battery to the Intake Air Heater Relay.
    5. Disconnect the #1 intake air heater relay signal wire. Connect a jumper wire from the signal terminal of the #1 intake air heater relay to battery positive. Did the relay click when 12 volts was applied?
      Yes --> Go To 6
      No --> Replace #1 Intake Air Heater Relay.
    6. Disconnect the #2 intake air heater relay signal wire. Connect a jumper wire from the signal terminal of the #2 intake air heater relay to battery positive. Did the relay click when 12 volts was applied?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
      No --> Replace #2 Intake Air Heater Relay.
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