DTC P1223, P1226, P1229, P1232, P1235, P1238, P1241, or P1244

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1 Page 1 of Chevrolet Kodiak C-Series (Conventional) C/C5 Kodiak, TopKick C-Series Service Manual Document ID: DTC P13, P16, P1, P13, P135, P138, P11, or P1 Circuit Description The engine control module (ECM) enables the appropriate fuel injector on the compression stroke for each cylinder. The ECM controls the fuel injection control module (FICM) by grounding the control circuit via a solid state device called a driver. The ECM monitors the state of the driver. If the ECM detects an incorrect voltage for the commanded state of an injector driver, DTCs P13, P16, P1, P13, P135, P138, P11, or P1 will set. DTC Descriptors This diagnostic procedure supports the following DTCs: DTC P13 Injector 1 Output Circuit DTC P16 Injector Output Circuit DTC P1 Injector 3 Output Circuit DTC P13 Injector Output Circuit DTC P135 Injector 5 Output Circuit DTC P138 Injector 6 Output Circuit DTC P11 Injector 7 Output Circuit DTC P1 Injector 8 Output Circuit Conditions for Running the DTC The engine is running. The ignition voltage is between 6 18 volts. Conditions for Setting the DTC The ECM detects that the commanded state and the actual state of the control circuit does not match. The condition exists for less than 1 second. Action Taken When the DTC Sets The control module stores the DTC information into memory when the diagnostic runs and fails. The malfunction indicator lamp (MIL) will not illuminate. The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Failure Records. The driver information center, if equipped, may display a message. Conditions for Clearing the MIL/DTC The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. A current DTC, Last Test Failed, clears when the diagnostic runs and passes. 0 General Motors. All rights reserved.

2 Page of 5 A history DTC clears after 0 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. Clear the MIL and the DTC with a scan tool. Test Description The numbers below refer to the step numbers on the diagnostic table.. This step determines if there are fuel injector control circuit DTCs set in a group. A short to voltage will set fuel injector control circuit DTCs for cylinders 1,, 6, 7, or cylinders, 3, 5, 8. Refer to DTC Descriptors in order to determine which cylinders are affected. If there are more than fuel injector control circuit DTCs set, a short to voltage on a fuel injector control circuit is likely the cause of the concern. A short to voltage will set more than fuel injector control circuit DTCs. 5. This step determines if there are fuel injector control circuit DTCs set in a group. A short to voltage will set fuel injector control circuit DTCs for cylinders, 3, 5, 8. If there is only 1 fuel injector DTC set, an open circuit, poor connector, or short to ground is likely the cause of the concern. Refer to DTC Descriptors in order to determine which cylinder is causing the condition. 6. This step verifies that the ECM is supplying the appropriate frequency, Hz, through the fuel injector control circuits to the FICM. If the DMM displays Hz while cranking, inspect for a poor connection at the FICM. 8. This step is testing for a short to ground on a fuel injector control circuit. If the test lamp illuminates on any fuel injector control circuit, a short to ground is the cause of the condition.. This step is testing for a short to a voltage. If the DMM displays a voltage greater than the specified value, a short to voltage is the cause of the condition. DTC P13, P16, P1, P13, P135, P138, P11, or P1 Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module Connector End Views or Engine Controls Connector End Views 1 Did you perform the Diagnostic System Check Vehicle? Diagnostic System Check - Vehicle in Vehicle DTC Information 1. Start and idle the engine.. Monitor the DTC Failed This Ignition parameter with a scan tool. Do any of the DTCs P13 1 fail this ignition? Observe the Freeze Frame/Failure Records for this DTC with a scan tool.. Turn OFF the ignition for 30 seconds. 3. Start the engine. Intermittent Conditions

3 Page 3 of 5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Does the DTC fail this ignition? Are DTC P13, P13, P138, and P11 all set? 5 5 Are DTC P16, P1, P135, and P1 all set? 6. Disconnect the harness connector C1 of the fuel injection control module (FICM). 6 Important: Use the J 356- Connector Adapter of the J 356 to probe the FICM connector. 3. While cranking the engine, measure the frequency of the appropriate fuel injector control circuit with a DMM. Refer to Measuring Frequency in Wiring. Hz Is the voltage frequency more than the specified value? 1 7. Disconnect harness connector C of the engine control module (ECM) Test the appropriate fuel injector control circuit for an open or short to another affected fuel injector control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring 8 8. Verify the harness connector C of the ECM is still disconnected Probe the affected fuel injector control circuits with a test lamp connected to battery voltage. Refer to DTC Descriptors and Probing Electrical Connectors in Wiring

4 Page of 5 Does the test lamp illuminate on any of the fuel injector control circuits?. Disconnect the harness connector C of the ECM. 3. Turn ON the ignition, with the engine OFF.. Measure the voltage from each of the fuel injector control circuits with a DMM. Refer to Probing Electrical Connectors in Wiring 1V Is the voltage more than the specified value on any of the fuel injector control circuits? Test the appropriate fuel injector control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Test the appropriate fuel injector control circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring 1 1 Inspect for poor connections at the harness connector of the FICM. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring 1 13 Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections and Repairing Connector Terminals in Wiring 1 Replace the FICM. Refer to Fuel Injector Control Module Replacement. Did you complete the replacement? Replace the ECM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?

5 Page 5 of 5 1. Clear the DTCs with a scan tool.. Turn OFF the ignition for 30 seconds. 3. Start the engine.. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK

DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208

Page 1 of 9 2004 Chevrolet Chevy K Silverado - 4WD Sierra, Silverado (VIN C/K) Service Manual Document ID: 850614 DTC P0201, P0202, P0203, P0204, P0205, P0206, P0207, or P0208 Circuit Description The fuel