P0203-FUEL INJECTOR 3 CIRCUIT / OPEN
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For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
With the engine running.
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Set Condition:
The Powertrain Control Module (PCM) detects an open Fuel Injector 3 control circuit.
POSSIBLE CAUSES |
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| (K13) FUEL INJECTOR NO. 3 HIGH-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| (K613) FUEL INJECTOR NO. 3 LOW-SIDE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE |
| FUEL INJECTOR NO. 3 |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting Procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, clear DTCs in the PCM. |
| 3. | Attempt to start the engine and test drive the vehicle. |
| 4. | With the scan tool, select view DTCs. |
Is the status active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K13) FUEL INJECTOR NO. 3 HIGH-SIDE CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
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| 1. | Turn the ignition off. |
| 2. | Disconnect the Fuel Injector No. 3 harness connector. |
| 3. | Disconnect the PCM C1 harness connector. |
| 4. | Measure the resistance of the (K13) Fuel Injector No. 3 High-Side Control circuit between the Fuel Injector No. 3 harness connector and the PCM C1 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 3
No
- Repair the (K13) Fuel Injector No. 3 High-Side Control circuit for an open or high resistance.
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Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
3. CHECK THE (K613) FUEL INJECTOR NO. 3 LOW-SIDE CONTROL CIRCUITFOR AN OPEN/HIGH RESISTANCE
 |
| 1. | Measure the resistance of the (K613) Fuel Injector No. 3 Low-Side Control circuit between the Fuel Injector No. 3 harness connector and the PCM C1harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 4
No
- Repair the (K613) Fuel Injector No. 3 Low-Side Control circuit for an open or high resistance.
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Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM)
- Standard Procedure).
| 1. | Measure the resistance between the terminals of Fuel Injector No. 3. |
Is the resistance between 150k and 210k Ohms?
Yes
- Go To 5
No
- Replace the fuel injector in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Injector No. 3 and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched, or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. |
| 4. | Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors. |
| 5. | Look for the data to change or for the DTC to reset during the wiggle test. |
| 6. | Perform any technical service bulletins that may apply. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the Powertrain Control Module in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).