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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

2002 ENGINES Engine Cooling - Chevy Express & Savana

SPECIFICATIONS FASTENER TIGHTENING SPECIFICATIONS

Fig. 1: Fastener Tightening Specifications Courtesy of GENERAL MOTORS CORP.

SCHEMATIC AND ROUTING DIAGRAMS MY Saturday, March 28, 2009 9:40:44 9:40:32 PM

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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

ENGINE COOLING SCHEMATICS

Fig. 2: Engine Cooling Schematics Courtesy of GENERAL MOTORS CORP.

COMPONENT LOCATOR COOLING SYSTEM COMPONENT VIEWS

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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 3: Coolant Recovery Tank Courtesy of GENERAL MOTORS CORP.

MY Saturday, March 28, 2009 9:40:32 PM

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© 2005 Mitchell Repair Information Company, LLC.


2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 4: Instrument Panel, Driver Outer Knee Bolster Bracket Courtesy of GENERAL MOTORS CORP. COOLING SYSTEM CONNECTOR END VIEWS

MY Saturday, March 28, 2009 9:40:32 PM

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© 2005 Mitchell Repair Information Company, LLC.


2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 5: Coolant Level Switch (Diesel) Courtesy of GENERAL MOTORS CORP.

MY Saturday, March 28, 2009 9:40:32 PM

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© 2005 Mitchell Repair Information Company, LLC.


2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 6: Coolant Level Module (Diesel) Courtesy of GENERAL MOTORS CORP. MY Saturday, March 28, 2009 9:40:32 PM

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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

DIAGNOSTIC INFORMATION AND PROCEDURES DIAGNOSTIC STARTING POINT - ENGINE COOLING

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Engine Cooling in order to identify the correct procedure for diagnosing the system and where the procedure is located. DIAGNOSTIC SYSTEM CHECK - ENGINE COOLING Test Description

The number(s) below refer to the step number(s) on the diagnostic table. 2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition. 3. Determine if the Powertrain Control Module (PCM) has set DTCs which may affect Engine Cooling operation are present. 4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 7: Diagnostic System Check - Engine Cooling Courtesy of GENERAL MOTORS CORP. SCAN TOOL DATA LIST

Fig. 8: Powertrain Control Module (PCM) Scan Tool Data List Courtesy of GENERAL MOTORS CORP. SCAN TOOL DATA DEFINITIONS

ECT Sensor- Range: -40°C to 150°C (-40°F to 302°F): The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses a high signal voltage and interprets the voltage as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal decreases and the PCM interprets the lower voltage as a warm engine. DIAGNOSTIC TROUBLE CODE (DTC) LIST MY Saturday, March 28, 2009 9:40:32 PM

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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana

Fig. 9: Diagnostic Trouble Code (DTC) List Courtesy of GENERAL MOTORS CORP. DTC P1258 Circuit Description

The PCM uses the ECT sensor to monitor the engine for an over temperature condition. This condition occurs when the coolant temperature is above 131°C (268°F). When an over temperature condition is present, DTC P1258 will set. The PCM will disable two groups of four cylinders by turning OFF the fuel injectors. By switching between the two groups of cylinders, the PCM is able to reduce the temperature of the coolant. Conditions for Running the DTC

The engine is running. Conditions for Setting the DTC

The PCM detects an engine over temperature condition. Action Taken When the DTC Sets 

 



The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic test has been run and failed. The PCM will turn ON the Service Engine Soon indicator. The PCM will alternately disable 2 groups of four cylinders by turning OFF the fuel injectors. The PCM will store conditions which were present when the DTC set as Freeze Frame and File Records data.

Conditions for Clearing the MIL/DTC 



The PCM will turn the MIL OFF after 3 consecutive trips that the diagnostic has been run and passed. The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

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1996 GMC SAVANA Service Repair Manual  

1996 GMC SAVANA Service Repair Manual  

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