Electronic Shifting into 4WD
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Joined: Oct 2003
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From: Fernie
Electronic Shifting into 4WD
Hi everybody,
I have a 99 Mazda B4000, like a Ford Ranger.
Whenever I turn my switch into 4wd high or low, it sounds like a relay goes click click......click click....click. Like it doesn't have even power to stick. Then my 4wheel lights on the dash start to flash.
Sometimes when I start the vehicle with the switch turned to 4W HIGH it will work.
I brang it into a shop and they said they did tests on it and think that it is the Electronic Shift Motor, having bad contacts. I've probably only used 4WD 5 times, short distances all 5 times.
Does anybody know the reason or how to fix this?
I live in Fernie and need 4 Wheel drive for the winter.
I will do anything to fix this frustrating problem.
If I haven't explained enough, ask and I will.
Any help or questions are greatly appreciated.
Thanks alot, Trevor
I have a 99 Mazda B4000, like a Ford Ranger.
Whenever I turn my switch into 4wd high or low, it sounds like a relay goes click click......click click....click. Like it doesn't have even power to stick. Then my 4wheel lights on the dash start to flash.
Sometimes when I start the vehicle with the switch turned to 4W HIGH it will work.
I brang it into a shop and they said they did tests on it and think that it is the Electronic Shift Motor, having bad contacts. I've probably only used 4WD 5 times, short distances all 5 times.
Does anybody know the reason or how to fix this?
I live in Fernie and need 4 Wheel drive for the winter.
I will do anything to fix this frustrating problem.
If I haven't explained enough, ask and I will.
Any help or questions are greatly appreciated.
Thanks alot, Trevor
Junior User
Joined: Jul 2003
Posts: 79
Likes: 0
theory
Hello,
This is a cut and paste from Rockledge.
Your 4x4 system, like mine, is known as the Pulse Vacuum Hublock (PVH) system, and is engaged as follows:
"...The ['98-'00 Ranger PVH] four wheel drive system is an electronic shift 4X4 system that allows the operator to choose between three different modes. The operator can switch 4X4 HIGH modes at any speed. To engage or disengage 4X4 LOW the vehicle speed must be less than 5 kph (3 mph), the brake depressed, and the transmission must be in NEUTRAL.
The shift motor sense plate, an integral part of the electronic shift motor, informs the generic electronic module (GEM) of the transfer case shift motor and contact plates A, B, C and D position.
The digital transmission range (TR) sensor is located on the LH side of the transmission, and informs the GEM when the transmission is in the NEUTRAL position.
The electronic shift motor is mounted externally at the rear of the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4X4 HIGH, 4X4 LOW and 2WD range positions.
When the GEM verifies the completion of the transfer case shift from 2WD to 4X4 HIGH (reading the contact plate positions), the GEM will then energize both pulse vacuum hublock (PVH) solenoids (supplying ground for 45 seconds). The PVH solenoid will allow a HIGH flow of intake manifold vacuum to the "wheel end hublocks", engaging the wheel end hubs to the front differential and transfer case to achieve four wheel drive.
When the GEM verifies the completion of the transfer case shift from 4X4 HIGH to 2WD (reading the contact plate positions), the GEM will then energize only one (low vacuum solenoid) of the PVH solenoids (supplying a ground for 10 seconds). The PVH solenoid will allow a "LOW" flow of intake manifold vacuum to the wheel end vacuum hublocks, disengaging the wheel end hubs from the front differential and transfer case to achieve two wheel drive.
The 4X4 shift motor uses a module containing two relays which, under control of the GEM, shifts the transfer case shift motor between 4X4 HIGH, 4X4 LOW and 2WD modes.
The solid state clutch relay is used to activate the clutch within the transfer case which aids in shifting to 4X4. "
This is a cut and paste from Rockledge.
Your 4x4 system, like mine, is known as the Pulse Vacuum Hublock (PVH) system, and is engaged as follows:
"...The ['98-'00 Ranger PVH] four wheel drive system is an electronic shift 4X4 system that allows the operator to choose between three different modes. The operator can switch 4X4 HIGH modes at any speed. To engage or disengage 4X4 LOW the vehicle speed must be less than 5 kph (3 mph), the brake depressed, and the transmission must be in NEUTRAL.
The shift motor sense plate, an integral part of the electronic shift motor, informs the generic electronic module (GEM) of the transfer case shift motor and contact plates A, B, C and D position.
The digital transmission range (TR) sensor is located on the LH side of the transmission, and informs the GEM when the transmission is in the NEUTRAL position.
The electronic shift motor is mounted externally at the rear of the transfer case. It drives a rotary cam which moves the mode fork and range fork within the transfer case between the 4X4 HIGH, 4X4 LOW and 2WD range positions.
When the GEM verifies the completion of the transfer case shift from 2WD to 4X4 HIGH (reading the contact plate positions), the GEM will then energize both pulse vacuum hublock (PVH) solenoids (supplying ground for 45 seconds). The PVH solenoid will allow a HIGH flow of intake manifold vacuum to the "wheel end hublocks", engaging the wheel end hubs to the front differential and transfer case to achieve four wheel drive.
When the GEM verifies the completion of the transfer case shift from 4X4 HIGH to 2WD (reading the contact plate positions), the GEM will then energize only one (low vacuum solenoid) of the PVH solenoids (supplying a ground for 10 seconds). The PVH solenoid will allow a "LOW" flow of intake manifold vacuum to the wheel end vacuum hublocks, disengaging the wheel end hubs from the front differential and transfer case to achieve two wheel drive.
The 4X4 shift motor uses a module containing two relays which, under control of the GEM, shifts the transfer case shift motor between 4X4 HIGH, 4X4 LOW and 2WD modes.
The solid state clutch relay is used to activate the clutch within the transfer case which aids in shifting to 4X4. "
Junior User
Joined: Jul 2003
Posts: 79
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Cleaning
tdanco,
I have a 98 Ranger and had a different set of issues on my 4WD not working. It ended up being the shift motor. It coast $260 and is very easy to install. Something like 4 bolts and some PVC gasket sealer. Did they provide you with the error code? If so I can compare it to mine. I understand these motors failing some what often. The motors have be updated soemthing like 2-3 times. I can provide you with the most recent part numbedr if needed.
Rick
I have a 98 Ranger and had a different set of issues on my 4WD not working. It ended up being the shift motor. It coast $260 and is very easy to install. Something like 4 bolts and some PVC gasket sealer. Did they provide you with the error code? If so I can compare it to mine. I understand these motors failing some what often. The motors have be updated soemthing like 2-3 times. I can provide you with the most recent part numbedr if needed.
Rick
Junior User
Joined: Jul 2003
Posts: 79
Likes: 0
I think
it was http://www.ford-parts.com/
if they do not quote you the same price I will have to look at homw for the recipt. Also you maybe able to get a deal from
"A follow-up
Well, my worst fears have been confirmed: After replacing the shift motor, the problem still persists.
At this point, I'm pretty confident that it's probably a bad ground somewhere. The reason being, that my cruise control has been intermittently quitting, and at night, the dashboard lights will just go out for a minute or two and then come back on. This truck is whacked!"
https://www.ford-trucks.com/forums/s...hreadid=138179
if they do not quote you the same price I will have to look at homw for the recipt. Also you maybe able to get a deal from
"A follow-up
Well, my worst fears have been confirmed: After replacing the shift motor, the problem still persists.
At this point, I'm pretty confident that it's probably a bad ground somewhere. The reason being, that my cruise control has been intermittently quitting, and at night, the dashboard lights will just go out for a minute or two and then come back on. This truck is whacked!"
https://www.ford-trucks.com/forums/s...hreadid=138179
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