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Home >> Chrysler >> 2004 >> Sebring GTC, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Powertrain Diagnostic Procedures - NGC DRIVEABILITY Symptoms, NGC DRIVEABILITY Diagnostic Tests DTCS P0016 To P0461 - Except Coupe >> DRIVEABILITY - NGC - Diagnostic Tests >> DTC P0418: Air Pump Relay Circuit >> Possible Causes

Possible Causes

AIR PUMP RELAY OPERATION

AIR PUMP RELAY GROUND

AIR PUMP RELAY

AIR PUMP RELAY CONTROL CIRCUIT OPEN

AIR PUMP RELAY CONTROL CIRCUIT SHORT TO GROUND

PCM

DIAGNOSTIC PROCEDURE - P0418-AIR PUMP RELAY CIRCUIT

TEST ACTION
1
NOTE: Before continuing the following test, always check the Air Pump Assembly in-line connectors. Ensure that there is no terminal damage, corrosion or backed out terminals. Verify that there is good wire to terminal connection in the connector.
Ignition on, engine not running.With the DRBIII®, actuate the Air Pump Relay.Is the Air Pump Relay operating?
  1. Yes --> Refer to the INTERMITTENT CONDITION  symptom in the Driveability category.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 2
2 Turn the ignition off.
Disconnect the Air Pump Relay harness connector.
Using a 12-volt test light connected to battery voltage, probe the Air Pump Ground circuit in the Air Pump Relay harness connector.
Does the test light illuminate brightly?
  1. Yes --> Go To 3
  2. No --> Repair the Air Pump Relay Ground circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
3 Turn the ignition off.
Disconnect the Air Pump Relay harness connector.
Using a 12-volt test light to ground, probe the Air Pump Relay Control circuit.
Turn the ignition on.
Using the DRBIII®, actuate the Air Pump Relay.
Does the test light illuminate brightly and flash on and off?
  1. Yes --> Replace the Air Pump Relay.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 4
4 Turn the ignition off.
Disconnect the Air Pump Relay harness connector.
Disconnect the PCM 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 MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the Air Pump Relay Control circuit from the Air Pump Relay harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
  1. Yes --> Go To 5
  2. No --> Repair the open in the Air Pump Relay Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
5 Turn the ignition off.
Disconnect the Air Pump harness connector.
Measure the resistance between ground and the Air Pump Relay Control circuit in the Air Pump Relay harness connector.
Is the resistance below 5.0 ohms?
  1. Yes --> Repair the short to ground in the Air Pump Relay Control circuit.

    Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .

  2. No --> Go To 6
6
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.Repair:Replace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC .
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