Hummer H2. Manual — part 888
LOCKING DIFFERENTIAL DISASSEMBLED VIEWS
Connector Part Information
z
15326801
z
2-Way F GT 150 Series (BK)
Pin
Wire Color
Circuit No.
Function
A
BK
1725
Rear Differential Lock - Low Reference
B
L-GN
2659
Rear Differential Lock - High - Control
2004 Hummer H2
2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2
Fig. 3: Locking Differential Component Views
Courtesy of GENERAL MOTORS CORP.
Callouts For Fig. 3
Callout
Component Name
1
Differential Bearing Retainer Ring
2
Differential Bearing Race
3
Differential Bearing Assembly
4
Locking Differential Coil Assembly
5
Locking Differential Coil Plate
6
Locking Differential Ball Bearing Plate - Outboard
7
Locking Differential Ball Bearing Assembly
8
Locking Differential Ball Bearing Plate - Inboard
9
Locking Differential Clutch Spring
10
Locking Differential Clutch Spring Retainer
11
Differential Carrier Lock Pin
12
Differential Side Gear Thrust Washer
13
Locking Differential Side Gear
14
Pinion Thrust Washer
15
Differential Pinion Gear
16
Differential Side Gear
2004 Hummer H2
2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2
DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC STARTING POINT - LOCKING/LIMITED SLIP REAR AXLE
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
exist. Reviewing the Description and Operation information will also help you determine if the condition
described by the customer is normal operation. Refer to Symptoms - Locking/Limited Slip Rear Axle in order
to identify the correct procedure for diagnosing the system and where the procedure is located.
DTC C0388
Circuit Description
The rear differential control circuit consists of a actuator (coil) which engages and disengages the rear axle
differential lock. The rear differential actuator consists of a coil assembly, and a locking assembly with springs
and pins to lock the rear differential, all within the rear differential assembly.
The rear axle differential lock actuator consists of the following circuits:
z
The rear differential lock control circuit, which is connected to the transfer case shift control module and
supplies battery voltage.
z
The rear differential lock return (ground) circuit, which is also connected to the transfer case shift control
module.
Whenever the rear differential lock has been requested the transfer case shift control module provides battery
voltage through the rear differential lock control circuit, and provides ground through the rear differential lock
return circuit through a current limiting driver.
Whenever a rear differential lock is requested the transfer case must be in 4 LO and the vehicle speed must be
below 5 km/h (3 mph) for the request to be accepted. The rear differential lock will remain locked up to 32
km/h (20 mph) after which the rear differential lock will disengage.
This DTC detects a short to ground, short-to-voltage, or an open circuit.
Conditions for Running the DTC
z
The ignition is ON.
17
Differential Side Gear Thrust Washer
18
Differential Pinion Gear
19
Pinion Thrust Washer
20
Differential Pinion Shaft Lock Screw
21
Electric Locking Differential Case Assembly
22
Differential Pinion Gear Shaft
2004 Hummer H2
2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2
z
System voltage is 9-18 volts.
Conditions for Setting the DTC
z
The transfer case shift control module monitors the state of the rear axle differential lock actuator. The
transfer case shift control module reads the rear differential lock control, and the rear differential lock
return circuits for a high and low voltage. The DTC will set if these circuits are high when a low voltage
is expected or when the circuits are low when a high voltage is expected.
z
The DTC will set if this circuit is high when a low voltage is present or when the circuit is low when a
high voltage is present.
Action Taken When the DTC Sets
z
All rear differential lock requests will be disabled. Transfer case mode shifts will not be affected
z
SERVICE 4WD indicator will be latched on for the remainder of the current ignition cycle.
Conditions for Clearing the DTC
z
The Transfer case shift control module will clear the DTC if the condition for setting the DTC is not
currently present.
z
A history DTC will clear after 33 consecutive ignition cycles without a fault present.
z
History DTCs can be cleared using a scan tool.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2: This step determines of the coil has excessive resistance or if the windings are shorted together.
3: This step determines if the coil or pigtail is shorted to ground.
4: This step determines if either the differential lock control or differential lock return circuits are shorted
to ground.
5: This step determines if the differential lock control and differential lock return circuits are shorted
together.
6: This step tests for an open or high resistance in both the return and control circuits.
7: This step refers to transfer case shift control module replacement.
8: This step refers to encoder motor replacement.
DTC C0388
Step
Action
Value
(s)
Yes
No
Schematic Reference: Transfer Case Control Schematics in Transfer Case - BW 4484
Connector End View Reference: Rear Axle Connector End Views
Did you perform the Diagnostic System Check - Transfer
Case?
Go to Diagnostic
System Check -
2004 Hummer H2
2004 DRIVELINE/AXLE Drive Axle - Locking/Limited Slip - Hummer H2
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст