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Discussion Starter #1
Hi lads,

just picked up on this thread after running a search.

My 4ws has recently failed and i've run a diagnostic by jumping the TWS pin to GND. The good news is it gives me a code through the 4ws warning light on the dash (code=5), but i cant find literature anywhere on 4ws codes. any ideas?

(I'm hoping code 5 doenst = 'you're about to spend many $$$' :rolleyes:

cheers
 

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Discussion Starter #2
ooops

sorry, that was supposed to be a reply under "diagnosis".

Anyway, if inyone knows anything about 4ws error codes a link etc would be appreciated

Dan
 

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4ws wasnt available over here so its only on private imports. Yet another thing we didnt get over here.

Kyle
 

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Once again.. einstein to the rescue... (my manuals cover OZ) :D

code 5: possible failure rear steering angle sensor, or harness.

check 4WS control unit connections.
check wiring harness for open or short circuit.
inspect rear steering angle sensor. this is done by lifting the carpet in the trunk, and disconnecting the socket..
measure the resistance of the terminals from the sensor...

--------
[ A]
[D B]
--------

D - B: 3.5 - 6.5 ohms
A - B: 0.5 - 5.7 ohms

if not within specifications... replace the rear steering gear assembly.. (ouch) :(

Hopefully it will be a wiring fault, if it's the sensor, you are looking at a replacement steering rack.

John
 

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Discussion Starter #5
Cheers for that einstein! I'll check it out this weekend.

Out of interest, in which manuals would i find such info (for next time)??

Sorry to hear there's no 4ws in the UK! I didnt realise just how good it is until mine failed...


thanks,
dan
 

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I have the genuine Mazda Factory workshop manuals...


It does mention in the normal handbook about 4WS, so maybe a very few UK cars had it?

John
 

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I have the original Mazda '88 Training Manual that outlines everything about 4WS. I left the company during the Gulf War, so I don't know if anything changed after '90. The #1 thing that seems to go brain-dead is the Timer box under the passenger seat (I've replaced two). The diagnosis leads you to believe that you need a new computer.... The computer is a lot more expensive than the timer box, and you still have the problem (intermittant brain-fade w/dash light) :confused: Everything else that goes wrong is "dirty connectors" over the years.
 

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hey there how can i extract a 4WS code i didn't understand what gelfing ment by "jumping TWS to GND" thanks.
 

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hey i just figured it out i shorted GND and TWS and on the dash the 4WS light flashed once every 4 seconds could you please tell me what this is as i searched and could not find anything
Thanks
 

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Is there a way that anyone can check these codes or do you need something to connect up with reads the codes???
 

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Chick, you can pay a mechanic to read the codes with a diagnostic machine or you can make your own code reader like most of us have using some wire and an LED which will flash out the codes which you can then translate to find what it is.
 

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and once again... :D

01: Speedo sensor/4WS speed sensor
05: Rear steering angle sensor
09: P/S fluid level/fluid level switch
22: rear stepping motor
23: rear steering gear
31: solenoid valve
61: 4WS control unit

instructions on reading codes can be found in the diagnostic thread on the UK forum.. it's sticky so should be somewhere near the top. there is a word doc that will help on how to extract the codes.

John
 

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Thank you again Einstein!
I don't get up on the net as often as I used to, I've been demobilized (from the Marines) and don't have unlimited access anymore. Nice to know that there is someone that fully understands the system (and puts up with its quirks) that's willing to help out ;)

Terri
 

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ok thanks einstein, so if i only get 1 flash every 4 seconds it a code 1 spedo sensor/4WS sensor so what can i do or replace to fix it and how much and hard is it to fix???
Thanks.
 

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Speed sensors

There are two speed sensors. The main one is in the speedometer, the other at the transaxle (base of the cable at the gear). The transaxle sensor is used as a "backup". Clean the connections and check operation again before replacing parts. The sensor on the transaxle usually gets gumed-up. You can't repair sensors, just test them (with a multimeter) and replace them when they go dead.
 

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ok thanks, where exactly on the transaxle is it and what is the best way to test it and replace it, also where exactly would the 4WS speed sensor be???
Thanks
 

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On 4WS cars, there are two speed sensors, however, they are combined in one unit.
This is located on the transmission, (gearbox) on the top, at the back.. it has a connector with wires.. (yes, it's an electric speedo)
Although on 4WS cars, there are two connectors, one higher than the other.

hope this helps... I have pictures in the manual, if necessary.

John
 

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On mine (its an early '89), There is a speed sensor in-between the transaxle speedo gear and the cable, right at the top of the housing near the firewall. Just cleaned and re-installed mine yesterday. Its a sealed unit, very similar in function to the magnetic pick-up in a distributor. The other speed sensor is housed behind the speedometer. You must remove the speedo to get at it.
At any rate, you must "spin" the sensor in the same way the cable would when the car is moving, and test the output with a multimeter. They either send a pulse-signal, or they don't. Small part, big job when you start to dig into the dash. Do this on a weekend. Use a book, envite a friend over to help, it will make things easier.

The down-side is that Einstein is in the UK, I'm in the US. I bit pricy to come over and help out.. :rolleyes:
 
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