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1 1 of 6 3/7/2013 9:56 AM 2002 Chevrolet TrailBlazer - 4WD Bravada, Envoy, TrailBlazer VIN S/T Service Manual DTC P1481 Circuit Description The powertrain control module (PCM) uses the cooling fan speed signal in order to determine the actual fan speed in relation to the desired fan speed. The PCM uses the cooling fan speed signal in order to reduce the cooling fan noise and in order to maintain the powertrain cooling requirements. The PCM supplies power and ground to the clutch hall effect sensor of the cooling fan clutch. The hall effect sensor returns a signal pulse through the speed signal circuit in response to the reluctor track, which is located inside the fan clutch. If during operation, the PCM detects a loss of the cooling fan speed signal, DTC P1481 will set. Conditions for Running the DTC The engine is running. System voltage is greater than 8.5 volts. Conditions for Setting the DTC The PCM has detected a loss of cooling fan speed signal. The above condition is present for at least 11 seconds. Action Taken When the DTC Sets The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed. The PCM will store the condition as Freeze Frame/Failure Records data. The PCM commands the cooling fan clutch to 100%. Conditions for Clearing the MIL/DTC The PCM turns OFF the malfunction indicator lamp (MIL) after the third consecutive trip that the diagnostic test has run and passed. The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. Clear the DTC by using the Clear DTC Information function of the scan tool. Diagnostic Aids An inline connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all inline connectors. Refer to system schematics for connector and 2013 General Motors. All rights reserved.
2 2 of 6 3/7/2013 9:56 AM locations. If the condition is not present, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. Disconnect the harness connector of the cooling fan clutch from the shroud. Inspect the exposed wires between the harness connector and the tubing. Inspect the cooling fan clutch harness in order to ensure that the clutch supply voltage circuit is not shorted to the following circuits: The 5-volt reference circuit. The cooling fan speed signal circuit. The low reference circuit. DTC P1481 will set if the engine is started without the drive belt ON. Test Description The numbers below refer to the step numbers on the diagnostic table. 2 Tests that the PCM receives a cooling fan speed signal through the cooling fan speed signal circuit. If answer to question is Yes, ensure to refer to all Diagnostic Aids. 3 Tests for the proper operation of the clutch hall effect sensor. 4 Tests for the proper operation of the 5-volt reference circuit and of the low reference circuit of the cooling fan. Step Action Values Yes No Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views 1 Did you perform the Engine Cooling Diagnostic System Check? 2 Go to Diagnostic System Check - Engine Cooling 1. Install a scan tool Start the engine. 3. With the scan tool, observe the Fan Speed parameter in the PCM ENG 3 data list RPM Go to Diagnostic Aids 3
3 3 of 6 3/7/2013 9:56 AM Does the scan tool indicate that the Fan Speed parameter is within the specified range? 3 1. Turn OFF the ignition. 2. Disconnect the cooling fan clutch harness connector at the shroud. 3. Connect a jumper wire between each of the following circuits: The 5-volt reference circuit The cooling fan speed signal circuit The low reference circuit 4. Connect a digital multimeter (DMM) to the cooling fan speed signal circuit and ground. 5. Turn ON the ignition with the engine OFF. 6. Manually rotate the cooling fan. 0 5 V Does the DMM voltage change? Disconnect the jumper wires. 2. Measure the voltage between the 5-volt reference circuit and the low reference circuit of the cooling fan. Is the voltage measurement near than 5 V 5 7
4 4 of 6 3/7/2013 9:56 AM the specified value? 5 1. Turn OFF the ignition. 2. Probe the low reference circuit of the cooling fan clutch with a test lamp connected to battery positive voltage. Does the test lamp illuminate? Test the 5-volt reference circuit of the cooling fan clutch for a high resistance, or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems Test the cooling fan speed signal circuit of the cooling fan clutch for a short to ground, for a high resistance, or for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems Test the cooling fan speed signal circuit of the cooling fan clutch for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems Disconnect the PCM Test the low reference circuit of the cooling fan for a high resistance or for an open. Refer to Circuit Testing and to Wiring Repairs in 15 12
5 5 of 6 3/7/2013 9:56 AM Wiring Systems. 1. Disconnect the jumper wires Test the cooling fan speed signal circuit of the cooling fan clutch for an open. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems Inspect for a poor connection at the harness connector of the cooling fan clutch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems Replace the cooling fan clutch. Refer to Fan Clutch Replacement. Did you complete the replacement? 15 Important: Program the PCM. 14 Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls 4.2L. 15
6 6 of 6 3/7/2013 9:56 AM Did you complete the replacement? Use the scan tool in order to clear the DTCs. 2. Operate the vehicle within the Conditions for Running in the DTC. Does the DTC reset? 2 System OK
Document ID: General Motors Corporation. All rights reserved.
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