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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 >> P0691-Low 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 Low Speed Cooling Fan.

    Is the Cooling Fan operating (low 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 connect.

    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)  LOW SPEED RAD FAN CONTROL CIRCUIT 
    Fig 3: CHECKING LOW SPEED RAD FAN CONTROL CIRCUIT
    GC0041676Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition on, engine not running.

    With a scan tool, select Radiator Cooling Fan Relay #1 Control State, Toggle, to actuate the Cooling Fan (Low Speed).

    Using a 12-volt test light connected to battery voltage, probe the (N201) Low 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)  (N201) LOW SPEED RAD FAN CONTROL CIRCUIT OPEN 
    Fig 4: MEASURING RESISTANCE OF THE LOW SPEED FAN CONTROL RELAY CIRCUIT
    GC0041956Courtesy of DAIMLERCHRYSLER CORP.

    Turn ignition off.

    Measure the resistance of the (N201) Low 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 (N201) Low Speed Fan Control Relay circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  6. 6)  (N201) LOW SPEED RAD FAN CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 5: CHECKING LOW SPEED RAD FAN CONTROL CIRCUIT SHORTED TO GROUND
    GC0041957Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (N201) Low 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 (N201) Low 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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