2002 3.2v-6 rodeo front axle vacuum shift motor

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2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Joncarn » Sat Sep 24, 2016 9:38 am

I have a 2002 Rodeo with 3.2 V-6, 4x4 and while driving the 4x4 randomly tries to engage without pressing the 4x4 dash button. After reading several threads I decided to check the vacuum lines at the axle and I discovered that I have only 1 vacuum line on the motor, not 2 like the worthless Haynes manual shows. I finally removed the motor after locating the wiring connector, which again was nowhere close to what the pictures in the manual shows, and removed the plastic cover. This motor does not have any vacuum switches inside, it's all electric.
What is going on its this thing? Why only 1 vacuum line? How do I test the motor now to see if it's working? The wiring is 4 wires, blue, green,white and black. I'm guessing the 4x4 dash switch just changes the polarity to reverse the motor, but because my 4 wire colors don't match the wiring diagram I am not sure which wires to power for testing.
What is also strange about this is that the transfer case motor should not be working at all, one of the magnets inside the motor came unglued from the housing and it is not engaged.
Is the 2003 model year different and I possibly have an early 2003 model even though the VIN indicates 2002 model year?
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Buster28 » Sat Sep 24, 2016 9:55 am

The axle actuator on 2000 and newer Rodeo's is electrical as opposed to vacuum. The hose is a vent for the axle tube and has nothing to do with actuator operation.
This is the electrical schematic for the axle actuator, click on image to expand.
Chuck the Haynes in the trash.
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02 Rodeo Sport 4X4 3.2L V6
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Joncarn » Sat Sep 24, 2016 12:54 pm

Thanks for the diagram. I bench tested the axle motor and it works. Fixed the magnet in the transfer motor and it works. The transfer case is engaging/disengaging when the dash button is pressed, but the axle motor is not. While I was driving it before, I could hear a lot of clicking coming from the console when the light was flashing, is the computer for this under the console or is they a relay? I see 2 controllers in the diagram so I'm thinking the problem is in one of these
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Buster28 » Sat Sep 24, 2016 1:50 pm

The 4WD Control Unit is under the center console, the SOF Controller is shown in the image.
Shift on the Fly (SOTF) Controller ((Isuzu/Honda part # # 8-97211-143-3)
Connector C49
1__*LATCH*__2
3__4________5__6

Pin 1_Motor Control signal to Axle Actuator Pin 4**Red
Pin 2_Motor Control signal to Axle Actuator Pin 3**Green
Pin 3 _+12 Vdc when Ignition switch is in Run (On) via Fuse CB14 15 AMP Turn/Backup Lamps**White/Green
Pin 4_2WD/4WD control signal from 4WD Control Unit**Brown/Yellow
Pin 5 No Connection
Pin-6_Chassis ground**Black
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Joncarn » Sat Oct 08, 2016 10:12 am

I disconnected the SOF relay but the indicator light in the dash is still blinking and I can hear the controller on the transfer case engaging and disengaging. I disconnected the electrical connector from the front axle actuator so at least it's not engaging. Do you have a part number or picture of the 4-wheel drive controller? I pulled the center console out and I have 2 boxes, one orange and one black. The black one doesn't even have a number on it, the orange one does and it also has "indicator" labeled. I also pulled the turn signal fuse and that stopped the light, but also caused the transmission selector to stop working, which really confused the ECM, causing really hard shifts between 2nd and 3rd gear. Trans shifts fine when I put the fuse back.
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Buster28 » Sat Oct 08, 2016 10:51 am

4WD Control Unit, (Isuzu/Honda part # 8-97165-958-0)
Connector B19
1__2__3__4__*LATCH*__5__6__7
8__9_10_11_12_____13_14_15_16

Pin-1_Transfer case Actuator Motor control signal**Yellow/Green
Pin-2_Transfer case Actuator Motor control signal**Blue/Green
Pin-3_NC
Pin-4_NC
Pin-5_2WD/4WD select switch signal, +12 Vdc via Turn/Backup fuse when Ignition Switch is in Run (On)**Blue
Pin-6_Ground level signal from Pin 2 axle actuator indicating it in the 4WD position**Brown/White
Pin-7_Ground level signal when transfer case actuator is in the 4WD engaged position**Blue/White
Pin-8_2WD/4WD control signal to SOTF controller module to operate the front axle actuator**Brown/Yellow
Pin-9_NC
Pin-10_Chassis ground**Black
Pin-11_NC
Pin-12_+12 Vdc from Turn/Backup fuse when Ignition Switch is in Run (On)**White/Green
Pin-13_Ground level signal to operate the "Wheels" icon**Blue/Red
Pin-14_4WD engaged signal to ABS electronic module (disables ABS in 4WD)**Orange
Pin-15_Ground level signal from Transfer case Actuator Switch 2WD position**Brown/Blue
Pin-16_Ground level signal from Transfer case Actuator Switch 4WD position**Brown/Red

The SOTF Controller receives a 2WD/4WD command signal from the 4WD Control Unit,
it responds by sending a DC voltage to the Axle Actuator motor causing it to rotate and
engage/disengage the left front axle locking mechanism.
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Darmin » Tue Jan 10, 2017 11:38 pm

Can anyone advise if this is the same for the vacum controlled axlemactuator?
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Re: 2002 3.2v-6 rodeo front axle vacuum shift motor

Postby Buster28 » Wed Jan 11, 2017 8:30 am

The 4WD control unit is the same on 98-99, however, it controls a Vacuum Solenoid Valve (VSV) as opposed to the 00-02 SOTF controller.
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