Hummer H3. Manual — part 34
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Verify that the GBCM is installed correctly. The GBCM should be installed on the negative
battery cables, with the sensor coil around the negative cables and facing away from the
battery, and with the harness connector facing toward the battery.
If the GBCM is installed backwards or incorrectly, remove and reinstall the GBCM.
2. Ignition ON, clear the DTC using the scan tool and start the engine. Verify that DTC B1566
does not set as current.
If the DTC sets, replace the GBCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for GBCM replacement, setup, and programming
DTC C0899
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC C0899
Device Voltage Low - EBCM
Diagnostic Fault Information
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
VSES/ABS Ignition 1
C0899
C0899
-
-
Ground
-
C0899
-
-
2008 Hummer H3
2008 ENGINE Engine Electrical - H3
Typical Scan Tool Data
Battery Voltage - EBCM
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition voltage level available on the
ignition 1 circuit fed by the VSES/ABS fuse for system operation. A low voltage condition
prevents the system from operating properly.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The ignition voltage to EBCM is less than 9 volts for 100 msec.
Action Taken When the DTC Sets
The antilock brake system (ABS), traction control system (TCS) and vehicle stability
enhancement system (VSES) are disabled for the duration of the ignition cycle.
The ABS and BRAKE indicators illuminates on the IPC.
The DIC displays the BRAKES and ABS FAULT messages.
Conditions for Clearing the DTC
The condition for the DTC is no longer present.
The EBCM automatically clears the history DTC when a current DTC is not detected in 100
consecutive drive cycles.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Circuit
Short to
Ground
Open
Short to
Voltage
Operating Conditions: Ignition ON
Parameter Normal Value: 12.6 Volts
VSES/ABS Ignition 1
0.0 Volts*
0.0 Volts*
12.6 Volts
*The scan tool will not communicate with the EBCM if there is 0 Volts on the circuit.
2008 Hummer H3
2008 ENGINE Engine Electrical - H3
Connector End View Reference
Component Connector End Views
Description and Operation
Charging System Description and Operation
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery
terminals. The voltage should be between 12.6 and 15.0 volts.
If not within the specified range, refer to Charging System Test.
2. Observe the scan tool EBCM Battery Voltage parameter. The reading should be between
12.6 and 15.0 volts.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connectors at the EBCM.
2. With the ignition OFF and the scan tool disconnected, open and close the drivers door, and
wait 30 seconds. Test for less than 1.5 ohms between the ground circuit terminals listed
below and ground:
Terminal 4 X1
Terminal 1 X2
Terminal 32 X2
If greater than the specified range, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminals listed below and
ground:
2008 Hummer H3
2008 ENGINE Engine Electrical - H3
Terminal 2 X1
Terminal 2 X2
Terminal 31 X2
4. Verify that a test lamp illuminates between the ignition circuit terminals listed below and
ground:
Terminal 1 X1
Terminal 46 X2
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an
open/high resistance.
5. If all circuits test normal, replace the EBCM.
Repair Procedures
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
DTC C0901
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC C0901
Device 2 Voltage Low - EBCM
Diagnostic Fault Information
Typical Scan Tool Data
Circuit
Short to
Ground
Open/High
Resistance
Short to
Voltage
Signal
Performance
VSES/ABS Ignition 1
C0901
C0901
-
-
Ground
-
C0901
-
-
2008 Hummer H3
2008 ENGINE Engine Electrical - H3
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст