LEMON Manuals: Even more car manuals for everyone
Home >> Chrysler >> 2009 >> PT Cruiser Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (DTCS P0299 To P0441) >> P0418-Secondary Air Injection System Control Circuit >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC IS ACTIVE 
    WARNING: The normal operating temperature of the exhaust system is very high. Never work around or attempt to service any part of the exhaust system until it has cooled. Special care should be taken when working near any part of the exhaust system. The temperature rises to a high level after a short period of engine operating time.
    1. Ignition on, engine not running.
    2. With the scan tool, Clear DTCs in the Powertrain Control Module (PCM).
    3. With the scan tool, actuate the Secondary Air Flow Pump Relay control to ON or TOGGLE for 5 seconds.
    4. With the scan tool, stop the actuation.
    5. With the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go to step  2

      No 

  2. (F343) FUSED ASD/MAIN RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 1: Checking Fused Main Relay Circuit
    GC0099892Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the C1 Secondary Air Pump Assembly harness connector.
    3. Turn the ignition on.
    4. Using a 12-volt test light connected to ground, check the (F343) Fused ASD/Main Relay Output circuit in the C1 Secondary Air Pump Assembly harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

      Is the test light illuminated and bright?

      Yes 

      • Go to step  3

      No 

  3. (K644) SECONDARY AIR PUMP CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: Checking Secondary Air Pump Control Circuit
    GC0099893Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
    2. Disconnect the Powertrain Control Module (PCM) harness connector.
    3. Measure the resistance between ground and the (K644) Secondary Air Pump Control circuit in the C1 Secondary Air Pump Assembly harness connector.

      Is the resistance below 100 Ohms?

      Yes 

      No 

      • Go to step  4
  4. (K644) SECONDARY AIR PUMP CONTROL CIRCUIT SHORTED TO VOLTAGE 
    Fig 3: Checking Secondary Air Pump Control Circuit
    GC0099894Courtesy of CHRYSLER LLC
    1. Turn the ignition on.
    2. Measure the voltage of the (K644) Secondary Air Pump Control circuit in the C1 Secondary Air Pump Assembly harness connector.

      Is there any voltage present?

      Yes 

      No 

      • Go to step  5
  5. (K644) SECONDARY AIR PUMP CONTROL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking Secondary Air Pump Control Circuit
    GC0099895Courtesy of CHRYSLER LLC
    1. Turn the ignition off.
      NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
    2. Measure the resistance of the (K644) Secondary Air Pump Control circuit between the C1 Secondary Air Pump Assembly harness connector and the Powertrain Control Module (PCM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go to step  6

      No 

  6. SECONDARY AIR PUMP ACTUATION 
    Fig 5: Checking Secondary Air Pump Control Circuit
    GC0099896Courtesy of CHRYSLER LLC
    1. Connect the Powertrain Control Module (PCM) harness connector.
    2. Turn the ignition on.
    3. With the scan tool, actuate the Secondary Air Flow Pump control to the ON (100%) position.
    4. Using a 12 volt test light connected to 12 volts, check the (K644) Secondary Air Pump Control circuit in the C1 Secondary Air Pump Assembly harness connector.
      NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
    5. With the scan tool, actuate the Secondary Air Flow Pump Relay control to the OFF (0%) position.
    6. Using a 12 volt test light connected to 12 volts, check the (K644) Secondary Air Pump Control circuit in the Secondary Air Pump Assembly harness connector.
      NOTE: The test light should not be illuminated with the control actuated OFF (0%).

      Is the test light illuminated when actuated ON and not illuminated when actuated OFF as described above?

      Yes 

      • Go to step  7

      No 

      • Go to step  8
  7. SECONDARY AIR PUMP ASSEMBLY 
    1. Turn the ignition off.
    2. Inspect the wiring and connectors between the Secondary Air Pump Assembly and the Powertrain Control Module (PCM).
    3. Look for any chafed, pierced, pinched, or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.

      Were any problems found?

      Yes 

      No 

  8. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Secondary Air Flow Pump Relay 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 related connectors.
    4. Refer to any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

scientia non olet · About LEMON Manuals