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.
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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
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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana
Fig. 5: Coolant Level Switch (Diesel) Courtesy of GENERAL MOTORS CORP.
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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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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana
The DTC can be cleared by using the scan tool Clear DTC Information function.
Fig. 10: DTC P1258 Courtesy of GENERAL MOTORS CORP. SYMPTOMS - ENGINE COOLING
Important: Review the system operation in order to familiarize yourself with the system functions. Refer to Cooling System Description and Operation . Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the Cooling System. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Inspect the coolant recovery reservoir for the proper coolant level.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to INTERMITTENT OR POOR CONNECTIONS . Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Low Engine Coolant Indicator Always On Engine Overheating Loss of Coolant Thermostat Diagnosis Fan Clutch Diagnosis
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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana
LOW ENGINE COOLANT INDICATOR ALWAYS ON
Fig. 11: Low Engine Coolant Indicator Always On Courtesy of GENERAL MOTORS CORP. ENGINE OVERHEATING Preliminary Overheating Diagnostic Inspection
1. Does overheating occur while pulling a trailer? Does the trailer weigh less than 454 kg (1,000 lb)? Is the vehicle equipped with a heavy duty cooling package? 2. Is the vehicle equipped with an add-on, or aftermarket, air conditioning system? If so, was a 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
heavy duty radiator installed? 3. If overheating occurs after prolonged idle in gear with the A/C system operating, instruct the owner on the following driving techniques to avoid overheating: Idle the engine in N (Neutral) as much as possible. Increase the engine RPM in order to get the coolant flowing through the radiator. If overheating is indicated by a hot lamp or the temperature gage, turn the A/C system off during extended idles of the engine. 4. If overheating occurs after prolonged driving in slow city traffic, or traffic jams, instruct the owner on the following driving techniques to avoid overheating: Idle the engine in N (Neutral) as much as possible. Increase the engine RPM in order to get the coolant flowing through the radiator. If overheating is indicated by a hot lamp or the temperature gage, turn the A/C system off during extended idles of the engine. If any of the above conditions apply, instruct the operator on driving techniques that would reduce the possibility of engine overheating.
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2002 Chevrolet Chevy Express G1500 2002 ENGINES Engine Cooling - Chevy Express & Savana
Fig. 12: Engine Overheating (1 Of 2) Courtesy of GENERAL MOTORS CORP.
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