P0203-FUEL INJECTOR 3 CIRCUIT / OPEN

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the engine running.
Set Condition:
The ECM detects an open or short in the Fuel Injector 3 circuit.

Possible Causes

INTERMITTENT DTC

(K663) FUEL INJECTOR 3 HIGH-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE

(K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE

(K663) FUEL INJECTOR 3 HIGH-SIDE CONTROL CIRCUIT SHORTED TO GROUND

(K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT SHORTED TO GROUND

(K663) FUEL INJECTOR 3 HIGH-SIDE CONTROL CIRCUIT SHORTED TO (K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT

(K663) FUEL INJECTOR 3 HIGH-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

(K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

FUEL INJECTOR 3

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Diagnostic Test

1. DTC IS ACTIVE

NOTE: This 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.
Attempt to start the engine and test drive the vehicle.
With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

Go To 2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2. (K663) FUEL INJECTOR HIGH-SIDE COMMON CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.
Disconnect the Fuel Injector 3 harness connector.
Disconnect the Engine Control Module harness connectors.
Remove the Main Relay.
Connect a jumper wire between cavity B7 and cavity B9 of the Main Relay Connector.
Turn the ignition on.
Measure the voltage of the (K663) Fuel Injector High-Side Common circuit in the Fuel Injector 3 harness connector.

Is there any voltage present?

Yes

Repair the (K663) Fuel Injector High-Side Common circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 3

3. (K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT SHORTED TO VOLTAGE

NOTE: The jumper wire should still be in place.

Measure the voltage of the (K613) Fuel Injector 3 Low-Side Control circuit in the Fuel Injector 3 harness connector.

Is there any voltage present?

Yes

Repair the (K613) Fuel Injector 3 Low-Side Control circuit for a short to voltage.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Go to 4

4. (K663) FUEL INJECTOR HIGH-SIDE COMMON CIRCUIT SHORTED TO GROUND

Turn the ignition off.
Remove the jumper wire in the Main Relay Connector.
Measure the resistance between ground and the (K663) Fuel Injector High-Side Common circuit in the Fuel Injector 3 harness connector.

Is the resistance above 1000 ohms?

Yes

Go to 5

Repair the (K663) Fuel Injector High-Side Common circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

5. (K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (K613) Fuel Injector 3 Low-Side Control circuit in the Fuel Injector 3 harness connector.

Is the resistance above 1000 ohms?

Yes

Go to 6

Repair the (K613) Fuel Injector 3 Low-Side Control circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

6. (K663) FUEL INJECTOR HIGH-SIDE COMMON CIRCUIT SHORTED TO (K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT

Measure the resistance between the (K663) Fuel Injector High-Side Common circuit and the (K613) Fuel Injector 3 Low-Side Control circuit in the Fuel Injector 3 harness connector.

Is the resistance above 1000 ohms?

Yes

Go to 7

Repair the (K663) Fuel Injector High-Side Common circuit for a short to the (K613) Fuel Injector 3 Low-Side Control circuit.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

7. (K663) FUEL INJECTOR HIGH-SIDE COMMON CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K663) Fuel Injector High-Side Common circuit between the Fuel Injector 3 harness connector and the Engine Control Module harness connector.

Is the resistance below 10.0 ohms?

Yes

Go to 8

Repair the (K663) Fuel Injector High-Side Common circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

8. (K613) FUEL INJECTOR 3 LOW-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K613) Fuel Injector 3 Low-Side Control circuit between the Fuel Injector 3 harness connector and the Engine Control Module harness connector.

Is the resistance below 10.0 ohms?

Yes

Replace Fuel Injector 3 in accordance with the Service Information.

Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

Repair the (K613) Fuel Injector 3 Low-Side Control circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)