For a complete wiring diagram Refer to Section 8WWhen Monitored:With the engine running.Set Condition:The ECM detects an open or shorted Fuel Injector 2 control circuit.Possible CausesINTERMITTENT DTC(K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE(K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE(K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO GROUND(K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT SHORTED TO GROUND(K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO (K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT(K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE(K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCEFUEL INJECTOR NO. 2ENGINE CONTROL MODULE (ECM)Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. DTC IS ACTIVEThis DTC can set as a result of a fault in any of the injector circuits. Be sure to check all injector circuits before replacing an injector and all injectors before replacing a module.Ignition on, engine not running.With the scan tool, Clear DTCs in the Engine Control Module (ECM).Attempt to start the engine and test drive the vehicle.With the scan tool, select View DTCs.Is the status Active for this DTC?YesGo To 2 NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. (K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.Disconnect the Fuel Injector No. 2 harness connector.Disconnect the Engine Control Module (ECM) harness connector.Remove the ASD Relay from the TIPM.Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.Turn the ignition on.Measure the voltage of the (K12) Fuel Injector No. 2 High-Side Control circuit in the Fuel Injector No. 2 harness connector.Is there any voltage present?YesRepair the (K12) Fuel Injector No. 2 High-Side Control circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 33. (K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE

The jumper wire should still be in place.Measure the voltage of the (K612) Fuel Injector No. 2 Low-Side Control circuit.Is there any voltage present?YesRepair the (K612) Fuel Injector No. 2 Low-Side Control circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 44. (K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.Remove the jumper wire and install the ASD Relay..Measure the resistance between ground and the (K12) Fuel Injector No. 2 High-Side Control circuit in the Fuel Injector No. 2 harness connector.Is the resistance above 1000 ohms?YesGo to 5NoRepair the (K12) Fuel Injector No. 2 High-Side Control circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. (K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K612) Fuel Injector No. 2 Low-Side Control circuit in the Fuel Injector No. 2 harness connector.Is the resistance above 1000 ohms?YesGo to 6NoRepair the (K612) Fuel Injector No. 2 Low-Side Control circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. (K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT SHORTED TO (K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT

Measure the resistance between the (K12) Fuel Injector No. 2 High-Side Control circuit and the (K612) Fuel Injector No. 2 Low-Side Control circuit in the Fuel Injector No. 2 harness connector.Is the resistance above 1000 ohms?YesGo to 7NoRepair the (K12) Fuel Injector No. 2 High-Side Control circuit for a short to the (K612) Fuel Injector No. 2 Low-Side Control circuit.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)7. (K12) FUEL INJECTOR NO. 2 HIGH-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K12) Fuel Injector No. 2 High-Side Control circuit between the Fuel Injector No. 2 harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 8NoRepair the (K12) Fuel Injector No. 2 High-Side Control circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. (K612) FUEL INJECTOR NO. 2 LOW-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K612) Fuel Injector No. 2 Low-Side Control circuit between the Fuel Injector No. 2 harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 9NoRepair the (K612) Fuel Injector No. 2 Low-Side Control circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)9. FUEL INJECTOR NO. 2Measure the resistance between the terminals of Fuel Injector No. 2.Is the resistance 185k ohms (+/- 10%)?YesGo to 10NoReplace the Fuel Injector in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)10. ENGINE CONTROL MODULE (ECM)Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 2 and the Engine Control Module (ECM).Look for any chafed, pierced, pinched, or partially broken wires.Look for broken, bent, pushed out or corroded terminals.Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.Look for the data to change or for the DTC to reset during the wiggle test.Refer to any Technical Service Bulletins that may apply.Were any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Engine Control Module (ECM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)