Honda Ridgeline. Manual — part 255
01
01
SJC8A000000000J1501PAAT00
Ref. No.
Tool Number
Description
Qty
15-2
Rear Differential
Special Tools
07SAZ-001000A
Backprobe Set
2
07AAD-S9VA000
Driveshaft Remover
1
*01
SJC8A00E44381000000DAAT00
15-3
Component Location Index
VTM-4 LOCK SWITCH
REAR DIFFERENTIAL BREATHER LINE
VTM-4 LOCK
INDICATOR
VTM-4 INDICATOR
VTM-4 CONTROL UNIT
REAR DIFFERENTIAL ASSEMBLY
VTM-4 RELAY
Test, page 15-49
Replacement, page 15-49
Replacement, page 15-51
Replacement, page 15-50
Removal, page 15-53
Installation, page 15-56
Test, page 22-75
Replacement, page 15-50
SJC8A00E44381000000BBAT00
VTM-4 Indicator
Diagnostic Trouble Code (DTC)
Self-diagnosis
15-4
Rear Differential
General Troubleshooting Information
The VTM-4 indicator comes on under certain conditions even if the 4WD system is working normally. Here are some
examples:
• When you use high-powered wireless equipment such as a CB or Ham radio in the vehicle.
• When you keep spinning the front wheels while the vehicle is stuck in sand, mud, snow, etc.
• When the battery voltage suddenly drops below 8 volts or rises above 16 volts.
After the VTM-4 indicator comes on, it stays on until you turn the ignition switch off.
• The VTM-4 control unit can memorize up to seven different DTCs. The system displays the DTCs by blinking the
VTM-4 indicator. Multiple DTCs are displayed in the order they occured, beginning with the most recent.
• If the same DTC is detected more than once, the most recent DTC is written over the earlier one. Therefore, when the
same problem is detected more than once, it is memorized as a single DTC.
• The DTCs are memorized in the EEPROM (non-volatile memory). Therefore, the memorized DTCs are not cleared
when the battery is disconnected or the VTM-4 control unit is disconnected.
• If there is a problem in the central processing unit (CPU) of the VTM-4 control unit, the VTM-4 indicator comes on,
but no DTC is memorized.
When a problem is detected by self-diagnosis, the system does the following:
• Turns the VTM-4 indicator on.
• Memorizes the DTC.
• Stops 4WD control and puts the vehicle back in 2WD (FWD).
• Reduces engine torque to suit the driving conditions when the abnormality was detected.
01
*01
Initialization of the VTM-4 Control Unit
Initialization with the HDS
Manual Initialization
15-5
A
VTM-4
INDICATOR
VTM-4 LOCK
INDICATOR
ON
OFF
Engine
start
VTM-4 LOCK
switch push
Engine
stop
IG switch
ON (II)
4 sec
4 sec
ON
OFF
Whenever the VTM-4 control unit is replaced, it must be
initialized to make the 4WD system function.
There are two methods used to initialize the VTM-4
control unit. The recommended method is to use the
Honda Diagnostic System (HDS) with the appropriate
software plugged into the data link connector (DLC).
The other method is to initialize the VTM-4 control unit
manually.
1. With the ignition switch OFF, connect the HDS to
the data link connector (DLC) (A) (located behind
the driver’s dashboard lower cover).
2. Make sure the HDS communicates with the VTM-4
control unit. If it doesn’t go to the DLC circuit
troubleshooting (see page 11-194).
3. Turn the ignition switch ON (II), and follow the
prompts on the HDS screen.
NOTE: See the HDS user’s manual for specific
instruction.
1. Start the engine (the VTM-4 indicator comes on,
and the VTM-4 LOCK switch indicator is off).
2. Apply the brakes, and move the shift lever to either
R, 1, or 2, then push the VTM-4 LOCK switch (the
VTM-4 indicator stays on, and the VTM-4 LOCK
switch indicator is on). The 4WD system is now in
lock mode.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II) (the VTM-4 indicator
and the VTM-4 LOCK indicator both come on for
4 seconds, then go off). The VTM-4 control unit is
initialized.
(cont’d)
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