• | 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*, P1682* | P0201**, P0202**, P0203**, P0204**, P0689*, P1682* | -- | -- |
Injector 1 Control Circuit | P0201, P0300 | P0201, P0300 | P0201, P0300 | -- |
Injector 2 Control Circuit | P0202, P0300 | P0202, P0300 | P0202, P0300 | -- |
Injector 3 Control Circuit | P0203, P0300 | P0203, P0300 | P0203, P0300 | -- |
Injector 4 Control Circuit | P0204, P0300 | P0204, P0300 | P0204, P0300 | -- |
* Engine cranks but does not start ** If the condition is between the injector and the splice. |
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.
• | The engine is running. |
• | The ignition voltage is between 11-18 volts. |
• | The DTCs run continuously once the above conditions are met. |
The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 6 seconds.
DTCs P0201, P0202, P0203, P0204 are Type B DTCs.
DTCs P0201, P0202, P0203, P0204 are Type B DTCs.
• | The Hold indicator flashes when there is an engine misfire. |
• | High resistance in the circuits of the injectors could 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
J 34730-405 Injector Test Lamp
Note: If you were sent here from DTC P0300-P0304, proceed to Circuit/System Testing.
• | INJ Ckt Short Gnd Test Status |
• | INJ Ckt Open Test Status |
• | INJ Sol Ckt Short Volts Test Status |
Each parameter should display OK or Not Run. |
⇒ | If the test lamp does not illuminate, repair the ignition voltage circuit for a short to ground or an open/high resistance. Replace the fuse if necessary. |
⇒ | If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the ECM. |
⇒ | If greater than the specified range, test the control circuit for a short to voltage. If circuit tests normal, replace the ECM. |
⇒ | If the test lamp does not flash, test the fuel injector circuits for a high resistance. If circuits test normal, replace the ECM. |
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 fuel injector. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for engine control module replacement, setup, and programming |