Diagnostic Test

CHECK FOR AN ACTIVE DTC
NOTE:
If the P0685-ASD CONTROL CIRCUIT DTC is also present, diagnose and repair that DTC before continuing.
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK THE BATTERY VOLTAGE SUPPLY TO THE ASD RELAY
1. Turn the ignition off.
2. Remove the ASD Relay from the PDC.
3. Measure the voltage between ground and Battery voltage supply (terminal 30) at the ASD Relay connector.
  Is the voltage equal to Battery voltage?
  
  Yes
  - Go To 3
  No
  - Repair the open voltage supply to the ASD Relay. If the fuse is blown, check the ASD Control Output circuit for a short to ground and repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
ASD RELAY
1. Replace the ASD Relay with a known good relay.
2. Turn the ignition on.
3. With the scan tool, read DTCs.
  Is the DTC active or pending?
  
  Yes
  - Go To 4
  No
  - Repair complete.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE POWER DISTRIBUTION CENTER
1. Remove the ASD Relay from the PDC.
2. Connect a jumper across terminal 30 and terminal 87 at the ASD Relay connector.
3. Back probe and measure the voltage between ground and the (F342) ASD Control Output circuit at the PDC.
  Is the voltage equal to Battery voltage?
  
  Yes
  - Go To 5
  No
  - Replace the Power Distribution Center in accordance with the Service Information.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (F342) ASD CONTROL OUTPUT CIRCUIT
1. Turn the ignition off.
2. Disconnect the PCM C1 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 the GPEC Diagnostic Adaptor to perform the diagnosis.
3. Connect the (special tool #10436, Adapter, GPEC Diagnostic) in-line with the PCM C1 harness connector.
4. Reconnect the PCM C1 harness connector.
5. Turn the ignition on.
6. Measure the voltage on the (F342) ASD Control Output circuit at all three terminals of the GPEC Adaptor.
  Is the voltage equal to Battery voltage at each terminal when the ignition is turned on?
  
  Yes
  - If the ASD Relay Control circuit DTC is not present, replace the Powertrain Control Module in accordance with the Service Information. Refer to MODULE, POWERTRAIN CONTROL (PCM), REMOVAL AND INSTALLATION .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Repair the (F342) ASD Control Output circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .