[3rd Gen : 96-00]: ABS light 1998 Grand Caravan
#1
ABS light 1998 Grand Caravan
Have an ABS light on. Found the left front speed sensor was damaged. Replaced it but the light is still on. I've tried three different code readers and none of them can read the ABS codes. Even tried Autozone. Upon start up no ABS light but when start driving light comes on. I've noticed headlights flicker when the light comes on. If turn off van and restart no ABS light until begin moving about 10 MPH. It does this every time. No light until begin moving. Any ideas?
#2
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#4
Tough without a code but there's things you can do. Sure acting like a wheel sensor but could be the wiring from the sensor to the controller. Disconnect the negative battery cable. Now you can disconnect the sensors and jump the two pins together then disconnect the controller and check for continuity back to the sensor. Other than that inspect the controller connector for corrosion or damage and verify all 5 fuses are good.
Sensor pin ID at controller:
LF - 4 to 11
RF - 3 to 18
LR - 10 to 2
RR - 1 to 17
I've seen ABS code readers for $50.
Sensor pin ID at controller:
LF - 4 to 11
RF - 3 to 18
LR - 10 to 2
RR - 1 to 17
I've seen ABS code readers for $50.
Last edited by Cougar41; 12-04-2016 at 04:23 PM.
#5
I've tried 3 different abs code readers with no luck. I did notice the reluctor rings/wheels in the front are a bit rusty and a few teeth were plugged up. I cleaned them but a few teeth are a bit damaged. This may be the cause. I'm not sure if codes would be able to distinguish between a bad sensor or damaged teeth. Thoughts?
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#7
any independent shop can read abs dtc. get it read and it will save you 3/4 of the work.
if the system uses passive abs sensors you can check the resistance of the sensors. 1.1ohms sounds about right. you can also check for a/c voltage output. connector you meter across the sensor pins and spin the wheel...you should see 0.1volts...the faster the tires spins the higher the voltage. inspect for any rust on the wss mounting surface...anything that increases the gap reduces the signal strength and cause signal dropout.
Continuity checks of the wiring from the abs module to the wss may be required.
if its an active wheel speed sensor, it cannot be tested this way.
if the system uses passive abs sensors you can check the resistance of the sensors. 1.1ohms sounds about right. you can also check for a/c voltage output. connector you meter across the sensor pins and spin the wheel...you should see 0.1volts...the faster the tires spins the higher the voltage. inspect for any rust on the wss mounting surface...anything that increases the gap reduces the signal strength and cause signal dropout.
Continuity checks of the wiring from the abs module to the wss may be required.
if its an active wheel speed sensor, it cannot be tested this way.
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#8
Was finally able to read the codes. Three problems. Left front sensor, right front sensor, and pump failure. Left front was damaged sensor. Right front was rusty reluctor ring. I was able to fix these two problems. I live in the rust belt and a common problem with the pump is wiring harness corrosion. I checked the harness and it appears to be good. I'm having trouble finding a pump. I'm not sure if new pumps are available. A used pump is probably not in any better shape. Thoughts?
#9