2002 Chevrolet Silverado 1500

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1 For the specific DTCs required for each system, see table. Systems such as fuel delivery, misfire, and comprehensive components may not be listed in a system status list. These tests run continuously on some vehicles and may not require an indicator. The PCM compares the actual MAF sensor frequency signal to the predicted MAF value. This comparison will determine if the signal is stuck based on a lack of variation, or is too low or too high for a given operating condition. DTC P0101 sets if the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value. The Powertrain Control Module (PCM) supplies 5 volts to the MAP sensor on the 5-volt reference circuit. The PCM also provides a ground on the low reference circuit. The MAP sensor provides a signal to the PCM on the MAP sensor signal circuit which is relative to the pressure changes in the manifold. The PCM should detect a low signal voltage at a low MAP, such as during an idle or a deceleration. The PCM should detect a high signal voltage at a high MAP, such as the ignition is ON, with the engine OFF, or at a Wide Open Throttle (WOT). The MAP sensor is also used in order to determine the Barometric (BARO) pressure. This occurs when the ignition switch is turned ON, with the engine OFF. The BARO reading may also be updated whenever the engine is operated at WOT. The PCM monitors the MAP sensor signal for voltage outside of the normal range. The PCM calculates a predicted value for the MAP sensor based on throttle position and engine speed. The PCM then compares the predicted value to the actual MAP sensor signal. The DTC P0106 will set if the MAP sensor signal is not within the predicted range. The PCM provides the TP sensor with a 5-volt reference circuit and a low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1 volt to more than 4 volts through the TP sensor signal circuit. When the conditions for running this DTC are met, the PCM will use the MAP sensor in order to determine if the predicted operating range of the TP sensor is correct. A skewed Manifold Absolute Pressure (MAP) sensor may cause this DTC to set. The MAP sensor should be tested for proper operation if the TP sensor is operating properly and this DTC continues to set. The PCM provides the TP sensor with a 5-volt reference circuit and a low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1 volt to more than 4 volts through the TP sensor signal circuit. If the PCM detects an excessively low signal voltage, this Diagnostic Trouble Code (DTC) will set. The PCM provides the TP sensor with a 5-volt reference circuit and a low reference circuit. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1 volt to more than 4 volts through the TP sensor signal circuit. If the PCM detects an excessively high signal voltage, this DTC will set. Thoroughly SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly SYSTEM. DTC P0327 & P0332: KNOCK SENSOR CIRCUIT - LOW VOLTAGE Monday, February 21, :35:03 4:35:09 PM Page Mitchell Repair Information Company, LLC.

2 To locate components, see COMPONENT LOCATIONS. For circuit reference, see WIRING DIAGRAMS article. For connector terminal identification, see CONNECTOR IDENTIFICATION. Description The knock sensors (KS) produce an AC signal under all engine operating conditions. The Powertrain Control Module (PCM) calculates the average voltage range of each KS signal. If the KS system is operating normally, the PCM should monitor the KS voltage varying above and below calculated average voltage. If the PCM detects a KS 1 signal or a KS 2 signal voltage within the calculated average range, a DTC will be set. DTC P0327 refers to the front KS. DTC P0332 refers to the rear KS. Conditions For Running DTC DTCs P0117, P0118, P0121, P0122, P0123, P0125, P1114, P1115, P1121, P1122, or P1258, are not set. The minimum noise level must be learned. The minimum noise level is learned when the following conditions are met: A. The Engine Coolant Temperature (ECT) must be greater than 140 F (60 C). B. The engine RPM is between for 10 seconds. The engine speed is between RPM. The Manifold Absolute Pressure (MAP) is less than 49 kpa. The Engine Coolant Temperature (ECT) is more than 140 F (60 C). The throttle angle is more than 0 percent. The engine run time is more than 10 seconds. The system voltage is more than 10 volts. Conditions For Setting DTC The PCM determines that this signal is less than the expected amount for more than 9 seconds. Action Taken When DTC Sets The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails. The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records. Conditions For Clearing 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. Monday, February 21, :35:03 PM Page Mitchell Repair Information Company, LLC.

3 A current DTC, Last Test Failed, clears when the diagnostic runs and passes. A history DTC clears after 40 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 in the diagnostic procedures. 2 This step ensures the malfunction is present 3 This test will isolate the KS from the rest of the circuit. 4 Tapping on the engine block will simulate an engine knock. Diagnostic Procedures 1. Did you perform the Diagnostic System Check-Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS under SELF-DIAGNOSTIC SYSTEM. If an engine knock can be heard, repair the engine mechanical condition before proceeding with this diagnostic. 2. Use a scan tool in order to observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC or as closely as possible to the Freeze Frame/Failure Records conditions. Does the DTC fail this ignition cycle? If yes, go to next step. If no, see DIAGNOSTIC AIDS. 3. Remove the intake manifold sight shield. Disconnect the KS jumper harness connector located on the left side of the intake manifold. Set the Digital Multimeter (DMM) to the 400K-ohm scale. Measure the resistance of the affected KS using the DMM connected to battery ground. Is the resistance of the KS K ohms? If yes, go to next step. If no, go to step 6. Do not tap on plastic engine components. 4. Connect the DMM between the affected KS signal circuit on the sensor side and a good ground. Set the DMM to the 400 mv AC hertz scale. Tap on the engine block near the affected KS while observing the signal indicated on the DMM. Is any signal indicated on the DMM while tapping on the engine block near the KS? If yes, go to next step. If no, go to step Disconnect the PCM connector. Test the KS signal circuit between the PCM and the KS jumper harness Monday, February 21, :35:03 PM Page Mitchell Repair Information Company, LLC.

4 connector for the following: An open or high resistance. A short to voltage. A short to ground. Did you find and correct the condition? If yes, go to step 12. If no, go to step Remove the intake manifold. See appropriate article in ENGINES. Test for an open, high resistance or a short to ground in the signal circuit between the KS jumper harness connector, located at the left side of the intake manifold and the KS connector. Did you find and correct the condition? If yes, go to step 12. If no, go to next step. 7. Inspect the KS signal circuit for a poor connection at the affected KS. If you find a poor connection, repair the connector as necessary. Did you find and correct the condition? If yes, go to step 12. If no, go to next step. 8. Replace the KS. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. After repairs, go to step Inspect the KS signal circuit for a poor connection at the KS jumper harness connector. If you find a poor connection, repair the connector as necessary. Did you find and correct the condition? If yes, go to step 12. If no, go to next step. 10. Inspect the KS signal circuit for a poor connection at the PCM. If you find a poor connection, repair the connector as necessary. Did you find and correct the condition? If yes, go to step 12. If no, go to next step. 11. Replace the PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article. Reprogram PCM. See POWERTRAIN CONTROL MODULE under PROGRAMMING. After repairs, go to next step. 12. Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running DTC. Does the DTC run and pass? If yes, go to next step. If no, go to step Observe the stored information, Capture Info with a scan tool. Does the scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS. If no, system is okay. Diagnostic Aids If the KS is dropped, the sensor must be replaced. The knock sensor must be correctly tightened to 18 ft. lbs. (25 N.m). If DTCs P0327 and P0332 are set at the same time, inspect for poor connections at the KS harness jumper, located at the left rear side of the intake manifold. Ensure that the KS head is clear of hoses, brackets, and engine wiring. For an intermittent condition, see INTERMITTENT CONDITIONS under SELF-DIAGNOSTIC SYSTEM. The sequencing and timing are PCM controlled. This DTC sets when the IC circuit is out of range. Rotation of Monday, February 21, :35:03 PM Page Mitchell Repair Information Company, LLC.

5 the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1.0 volt to more than 4 volts through the signal circuit. If the PCM detects an intermittent and excessively high signal voltage, this DTC will set. Rotation of the TP sensor rotor from the closed throttle position to the Wide Open Throttle (WOT) position provides the PCM with a signal voltage from less than 1 volt to more than 4 volts through the TP sensor signal circuit. If the PCM detects an intermittent excessively low signal voltage, this DTC will set. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF- DIAGNOSTIC SYSTEM. Thoroughly check any circuitry that is suspected of causing the intermittent complaint. See under SELF-DIAGNOSTIC SYSTEM. Monday, February 21, :35:03 PM Page Mitchell Repair Information Company, LLC.

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