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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 | Signal Performance |
|---|---|---|---|---|
Ignition Voltage | P0689 00 | P0201 00**, P0202 00**, P0203 00**, P0204 00**, P0689 00* | - | - |
Injector 1 Control Circuit | P0201 00, P0300 00 | P0201 00, P0300 00 | P0201 00, P0300 00 | - |
Injector 2 Control Circuit | P0202 00, P0300 00 | P0202 00, P0300 00 | P0202 00, P0300 00 | - |
Injector 3 Control Circuit | P0203 00, P0300 00 | P0203 00, P0300 00 | P0203 00, P0300 00 | - |
Injector 4 Control Circuit | P0204 00, P0300 00 | P0204 00, P0300 00 | P0204 00, P0300 00 | - |
* Engine cranks but does not start. Open fuse, cranks no start ** If the condition is between the injector and the splice. | ||||
The control module enables the appropriate fuel injector pulse for each cylinder. Ignition voltage is supplied to the fuel injectors. The control module controls each fuel injector by grounding the control circuit via a solid state device called a driver. The control module monitors the status of each driver. If the control module detects an incorrect voltage for the commanded state of the driver, a fuel injector control circuit DTC sets.
| • | The engine is running. |
| • | The battery voltage is greater than 9 V. |
| • | These DTCs run continuously when the above conditions are met |
| • | The control module detects an incorrect voltage on the fuel injector control circuit. |
| • | The above condition is met for 5 s |
DTCsP0201 00, P0202 00, P0203 00, P0204 00 are Type B DTCs.
DTCsP0201 00, P0202 00, P0203 00, P0204 00, are Type B DTCs.
| • | The MIL indicator flashes when there is an engine misfire. |
| • | 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 cylinder(s) for a high resistance if you suspect a condition. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
| ⇒ | 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 or replace the appropriate Q17 Fuel Injector. |
| ⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | 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 Engine Control Module. |
Note: The engine coolant temperature (ECT) sensor must be between 10-32°C (50-90°F) in order for an accurate measurement.
| ⇒ | If not within the specified range, replace the Q17A Fuel Injector 1, Q17B Fuel Injector 2, Q17C Fuel Injector 3, or Q17D Fuel Injector 4. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
| © Copyright Chevrolet. All rights reserved |
| © Copyright Chevrolet. All rights reserved |
