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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Ignition Voltage | P0AB9, P0AC4, P0201, P0202, P0203, P0204, P16E0 | P0AB9, P0AC4, P0201, P0202, P0203, P0204, P16E0 | - |
Fuel Injector 1 Control | P0201, P0300 | P0201, P0300 | P0201, P0300 |
Fuel Injector 2 Control | P0202, P0300 | P0202, P0300 | P0202, P0300 |
Fuel Injector 3 Control | P0203, P0300 | P0203, P0300 | P0203, P0300 |
Fuel Injector 4 Control | P0204, P0300 | P0204, P0300 | P0204, P0300 |
The engine control module (ECM) enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The ECM controls each fuel injector by grounding the control circuit via a solid state device called a driver. The ECM monitors the status of each driver. If the ECM detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.
• | The engine is running. |
• | The ignition voltage is greater than 11 V for greater than 5 s. |
• | These DTCs run continuously when the above conditions are met. |
• | The ECM detects an incorrect voltage on the fuel injector control circuit. |
• | The above condition is met for greater than 6 s. |
DTCs P0201, P0202, P0203, and P0204 are Type B DTCs.
DTCs P0201, P0202, P0203, and P0204 are Type B DTCs.
• | High resistance in the circuits of the injectors may set a misfire DTC without setting an injector DTC. Test the injector circuits of the affected cylinders for a high resistance if you suspect a condition. |
• | Performing the Fuel Injector Solenoid Coil Test may help isolate an intermittent condition. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
J 34730-2C Test Lamp
For equivalent regional tools, refer to Special Tools : Diagnostic Tools .
• | Cylinder 1-4 Injector Control Circuit Low Voltage Test Status |
• | Cylinder 1-4 Injector Control Circuit Open Test Status |
• | Cylinder 1-4 Injector Control Circuit High Voltage Test Status |
Each parameter should toggle between OK and Not Run or Not Run and OK. |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary. |
⇒ | If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |
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