abs help PST2 tester

[cbr786]

hello folks trying to solve ABS issues on a 964 1990 C2 manual cab. I get anti lock light come on after the car reaches 5-10mph with the buzzer sounding off as well. My question is this an a PST2 tester read the ABS module on a 1990 C2 ?? I think it cannot I believe the C4 ABS module can be read by a Porsche tester but the C2 cannot. The only way to read faults in C2 is possibly with hammer? or the ABS LED tool that plugs directly into the place where the ABS brain/ECU resides.

it is annoying as I read that if a wheel speed sensor is faulty and you repair replace that wheel sensor the ABS has to be reset before fault clears or can you simply disconnect the battery to clear all fault codes??

any help would appreciated. Currently when I scan the 964 with a PST2 the DME,AIRCONDITIONING,AIRBAG are the only modules that highlight up as readable the remaining tiptronic,abs 5,& alarm module remain unlit ??

I understand the fact the tiptronic module will not light up as my car is manual, also the alarm module will not light up prehaps because the 1990 had a simple relay sort of factory alarm without the alarm ECU under the passenger seat.

What I dont understand is why ABS is not highlighting? Maybe Loren can chime in and explain many thanks in advance.

[Richard Hamilton]

Are you using a genuine PST2 with a genuine cable? Some of the adapter-type cables are not wired correctly.

[magcuda]

On board diagnostics did not start until ABS 5, which your car does not have

Old school on this one. Scope or analog VOM to check wheel speed sensors

[Richard Hamilton]

ABS diagnosis can certainly be done with the Porsche 9288 Tester (Bosch KTS300 "Hammer") and with the PST2. I think that cbr786's problem is that the L-line diagnostic connection, which is used in ABS diagnosis, may not be present in the cable. The DME uses the K-line, hence he can read the modules which use K-line, but not those which use the Porsche-specific L-line.

[cbr786]

ABS diagnosis can certainly be done with the Porsche 9288 Tester (Bosch KTS300 "Hammer") and with the PST2. I think that cbr786's problem is that the L-line diagnostic connection, which is used in ABS diagnosis, may not be present in the cable. The DME uses the K-line, hence he can read the modules which use K-line, but not those which use the Porsche-specific L-line.

[cbr786]

Oops made mistake using iphone to reply & re-posted Richards post. I have conflicting opinions on this topic. Some people say only C4 1989 + models abs can be read by pst2 tester. & 1989-1991 C2 models cannot be read. I know in Adrians book he mentions something along the lines of using a special tool to plug direct into where the abs harness attaches to the abs ecu. Some sort of led device. I am gonna investigate to see if my K&L lines are being used properly on my adapter. I still wish to resolve this issue as it gets to me when something is not functioning correctly lol. On a lighter side I fixed my abs issue turned out two abs sensors where not seated into their respective harness bunch plugs. I found this information out by using volt meter at abs ecu checking pins for resistance measurements for each sensor. Thank you both posters for chiming in on this topic as i posted the same topic on Rennlist & no replies.

[Richard Hamilton]

Check the connections against my diagram here:

[cbr786]

Arrr yes I am using the Canadian supplied sense solutions adapter not the Chinese one which seems to utilise all the pins lol. I guess I will attempt to wire knock & TD sensor wires up as well as I have a cheap Chinese spare I bought earlier which was useless as a disection subject.

If the sense solutions are good copies & I am using genuine pst2 lead I still don't understand why I cannot read abs ? Also something else weird happens on some scans it picks up Airconditioning when it has faults stores & on other occasions it misses it completely but always manages to pick up DME & airbag modules with out fail

[Richard Hamilton]

Check the pins on the KTS-card. They are very fine, and can get bent easily.

[cbr786]

My KTS card is fine. I did notice that the pins on. The dongle supplied by sense has only 5 pins being used Pins 6,7,10,12,13 are used on sense plug . I know this is not the correct amount as looking at the diagnostic plug on a 964 it uses more then 5 pins

[magcuda]

The box Adrian talks about is a Bosch ABS tester. I would connect to the ABS harness plug and it had a dial.

You could choose which sensor you wanted to monitor, with a built in analog volt meter.

It would allow you to power up the ABS relays

Not all of the pins in the diag plug are used