Possible Causes(K51) ASD RELAY CONTROL CIRCUIT OPEN(F344) ASD RELAY OUTPUT CIRCUIT(S) OPENCHECKING THE ASD RELAY SYSTEM(Z905) ECM GROUND CIRCUIT(S) OPENFUSED ASD RELAY BATTERY SUPPLY CIRCUIT OPEN(F202) FUSED IGNITION SWITCH (START/RUN) OUTPUT CIRCUIT OPENSUBSTITUTE ASD RELAY(K51) ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE1. ECM GROUND CIRCUIT(S) OPEN

Turn the ignition off.Disconnect the ECM harness connectors.Using a 12-volt test light connected to 12-volts, check each of the ECM ground circuits in ECM harness connector C2 cavities 2, 4 and 6.Did the test light illuminate for each cavity?YesGo To2NoRepair the ECM Ground circuit(s) for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2. (F202) FUSED IGNITION SWITCH START/RUN OUTPUT CIRCUIT OPEN

Turn the ignition to the Start position.Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Start/Run Output circuit in ECM harness connector C2 cavity 41.Turn the ignition to the Run position.Using a 12-volt test light connected to ground, check the (F202) Fused Ignition Switch Start/Run Output circuit in ECM harness connector C2 cavity 41.Is the test light on for both ignition switch positions?YesGo To3NoRepair the (F202) Fused Ignition Switch Start/Run Output circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. CHECKING THE ASD RELAY SYSTEM

Turn the ignition off.Connect a jumper wire between ground and the (K51) ASD Relay Control circuit in ECM C2 harness connector cavity 42.Turn the ignition on.Using a 12-volt test light connected to ground, check the (F344) Fused ASD Relay Output circuits at the ECM C2 harness connector cavities 1, 3 and 5.Does the test light illuminate brightly for each circuit?YesTest Complete.NoGo To44. FUSED ASD RELAY BATTERY SUPPLY CIRCUIT OPEN

Turn the ignition off.Remove the ASD Relay from the TIPM.Using a 12-volt test light connected to ground, check both Fused ASD Relay Battery Supply circuits in ASD Relay connector.Is the test light on?YesGo To5NoRepair the Fused ASD Relay Battery Supply circuit(s) for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. (F344) ASD RELAY OUTPUT CIRCUIT OPEN

Connect a jumper wire between cavity 30 and cavity 87 in the ASD Relay connector.Using a 12-volt test light connected to ground, check the (F344) ASD Relay Output circuit in ECM harness connector C2 cavities 1, 3 and 5.Did the test light illuminate for each circuit?YesGo To6NoRepair the (F344) ASD Relay Output circuit(s) for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. ASD RELAY

Turn the ignition off.Install a known good relay in place of the ASD Relay.Connect a jumper wire between ground and the (K51) ASD Relay Control circuit in ECM C2 harness connector cavity 42.Turn the ignition on.Using a 12-volt test light connected to ground, check the (F344) Fused ASD Relay Output circuits at the ECM C2 harness connector cavities 1, 3 and 5.Did the test light illuminate brightly for each circuit?YesReplace the ASD Relay.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To77. (K51) ASD RELAY CONTROL CIRCUIT OPEN

Turn the ignition off.Remove the ASD Relay from the TIPM.Measure the resistance of the (K51) ASD Relay Control circuit between the TIPM connector and the ECM harness connector.Is the resistance below 10.0 ohms?YesGo To8NoRepair the (K51) ASD Relay Control circuit for an open.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. (K51) ASD RELAY CONTROL CIRCUIT SHORTED TO VOLTAGE

Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay connector in the TIPM.Turn the ignition on.Measure the voltage on the (K51) ASD Relay Control circuit.Is the voltage above 1.0 volt?YesRepair the (K51) ASD Relay Control circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoTest Complete.