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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS P0646 To P127C >> Diagnosis And Testing >> P0693-High Speed Fan Relay Control Circuit >> Diagnostic Test

Diagnostic Test

  1. 1)  RADIATOR COOLING FAN MODULE OPERATION 

    Ignition on, engine not running.

    With a scan tool, actuate the High Speed Cooling Fan.

    Is the Cooling Fan operating (high speed)? 

    Yes 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  2).
  2. 2)  (A16) FUSED B+ CIRCUIT 
    Fig 1: Checking Fused B+ Circuit
    GC0041674Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Radiator Cooling Fan Module harness connector.

    Using a 12-volt test light connected to ground, probe the (A16) Fused B+ circuit in the Radiator Cooling Fan Module harness connector.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To  3).

    No 

    1. Repair the (A16) Fused B+ circuit. Inspect the related fuse and repair as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  3. 3)  (Z903) GROUND CIRCUIT 
    Fig 2: Checking Ground Circuit
    GC0041675Courtesy of DAIMLERCHRYSLER CORP.

    Using a 12-volt test light connected to battery voltage, probe the (Z903) Ground circuit in the Radiator Cooling Fan Module harness connector.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To  4).

    No 

    1. Repair the (Z903) Ground circuits.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  4. 4)  HIGH SPEED RAD FAN CONTROL CIRCUIT 
    Fig 3: CHECKING HIGH SPEED RAD FAN CONTROL CIRCUIT
    GC0041959Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on, engine not running.

    With a scan tool, actuate the High Speed Cooling Fan.

    Using a 12-volt test light connected to battery voltage, probe the (N112) High Speed Rad Fan Control circuit in the Radiator Cooling Fan Module harness connector.

    Does the test light illuminate brightly and flash on and off? 

    Yes 

    1. Replace the Radiator Cooling Fan Module.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  5).
  5. 5)  (N112) HIGH SPEED RAD FAN CONTROL CIRCUIT OPEN 
    Fig 4: CHECKING HIGH SPEED RAD FAN CONTROL CIRCUIT FOR OPEN
    GC0041960Courtesy of DAIMLERCHRYSLER CORP.

    Turn ignition off.

    Measure the resistance of the (N112) High Speed Fan Control Relay circuit from the Radiator Cooling Fan Module harness connector to the PCM harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  6).

    No 

    1. Repair the open in the (N112) High Speed Fan Control Relay circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  6. 6)  (N112) HIGH SPEED RAD FAN CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 5: CHECKING HIGH SPEED RAD FAN CONTROL CIRCUIT
    GC0041961Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (N112) High Speed Fan Control Relay circuit in the PCM harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (N112) High Speed Fan Control Relay circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Replace the Powertrain Control Module in accordance with the Service Information.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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