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Diagnostic Procedure

DIAGNOSTIC PROCEDURES - P0685-ASD RELAY CONTROL CIRCUIT

TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIII®, actuate the ASD Relay.
Is the ASD Relay operating?
Yes --> Refer to the INTERMITTENT CONDITION SYMPTOM .
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 2		 All
2 Turn the ignition off.
Remove the ASD Relay from the PDC.
Ignition on, engine not running.
Measure the voltage of the (A14) Fused B+ circuits in the PDC.
Is the voltage above 11.0 volts?
Yes --> Go To 3
No --> Repair the (A14) Fused B+ circuit. Check and replace any open fuses.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
3 Turn the ignition off.
Remove the ASD Relay from the PDC.
Measure the resistance of the ASD Relay between the Fused B+ terminal and the ASD Relay Control terminal.
Is the resistance between 60 to 85 ohms?
Yes --> Go To 4
No --> Replace the ASD Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
4 Turn the ignition off.
Remove the ASD Relay from the PDC.
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 (K51) ASD Control circuit from the PDC to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 5
No --> Repair the open in the (K51) ASD Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
5 Turn the ignition off.
Remove the ASD Relay from the PDC.
Measure the resistance between ground and the (K51) ASD Relay Control circuit in the PDC.
Is the resistance below 5.0 ohms?
Yes --> Repair the short to ground in the (K51) ASD Relay Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 6		 All
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.RepairReplace and program the Powertrain Control Module in accordance with the Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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