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Questions and Answers

Ford Ranger RABS Light And DTCs

Q. I have a 1994, Ford Ranger XLT, 3.0 liter V-6, automatic transmission with about 165,000 miles on it, RABS with P/S, A/C and cruise control. For about the past year since I got my truck my ABS and emergency brake lights have been turning on at random times such as when I'm actually driving, backing up, or even sitting still. And they just stay on until I turn the car off completely and restart it.

Ford Ranger RABS Light And DTCs

But the truck seems to run perfectly fine so I haven't took to much worry into the cause. I've tried changing all my brakes and even the master cylinder hoping to fix the problem but nothing has seemed to work. All my levels have been fine also so there's no problem there.

But just recently I've started to get to get a check engine light turning on for a few seconds and then it will go off and will continue to do this at random times also. This worried me, so I went out and got myself a code scanner, and I'm getting the error codes of 543 and 332.

I'm not really sure which error I've had this whole time but I would like to get them both fixed. So to try to fix find the problem with the error code 332, I checked the EGR valve and that was working fine but I replaced it anyways. The pressure feedback sensor seems to be working fine also since it holds a pressure, so I'm not sure what else it could be causing the problem with the error code 332.

And with the error code 543, I'm not sure where to even really check anymore to try to find the problem with that. Any help you could give me would be very helpful.

Thanks,
Paul

A. If the RABS light is on, it means the RABS Module has detected a fault in the RABS system and has stored a Diagnostic Trouble code (DTC). To retrieve the RABS dtcs:

Verify the ignition switch is in the RUN position, engine does not need to be running. Next, locate the black Rear Anti-lock Brake System II (RABS II) diagnostic connector. The diagnostic connector has two mating halves, one of which has a black/orange wire connected to it. Disconnect the two halves.
  1. Attach one end of a jumper wire to the black with orange stripe wire side of the diagnostic connector. CAUTION: Care must be taken to connect only the black/orange stripe wire to ground. Connecting the mating connector wire to ground will result in a blown fuse.
  2. Momentarily ground the opposite end of the jumper wire by connecting it to a good chassis ground for one to two seconds.
  3. Grounding this wire should start the RABS lamp flashing.
  4. The code consists of a number of short flashes and ends with a long flash. Count the short flashes and include the following long flash in the count to obtain the code number. EXAMPLE: Three short flashes followed by one long flash indicates diagnostic trouble Code 4. The code will continue to repeat itself until the key is turned OFF. It is recommended that the code be verified by reading it several times. A diagnostic trouble code of 16 will be obtained when the module detects normal system operation.

The red brake warning light is constantly monitored by the Rear Anti-lock Electronic Control Module. If the red light illuminates, the anti-lock electronic control module will disable the Rear Anti-lock Brake (RABS II ) system. For this reason, diagnosing and resolving any base brake concerns illuminating the red brake warning light will, in most cases, resolve a perceived RABS II concern.

The red brake warning light is used to indicate a low brake fluid level condition or parking brake applied condition. To check this light, insert the key in the ignition lock cylinder and turn it to the START position. The brake warning light should glow in this position.

Allow the key to spring back from the START position to the RUN position. At this time the red brake warning light should turn off. If it does not turn off, recheck the parking brake switch to make sure that it is fully disengaged. If the red brake warning light is still on, service the base brake system.

The yellow Rear Anti-lock Brakes System II (RABS II) warning light is used to indicate a malfunction and a deactivation of the RABS II system. To check this light, first turn the ignition to the START position, allow the key to spring back from START position to the RUN position. The RABS light should perform a self-check by glowing for approximately two seconds and then turn off.

If it turns back on and does not flash, then a system concern has been detected.

If the yellow REAR ABS warning light begins to flash, this indicates that the keep-alive memory (KAM) power to the anti-lock electronic control module has been disrupted.

Ford Ranger RABS Light And DTCs

Trouble Code Condition
2 Open RABS Isolation Solenoid Circuit
3 Open RABS Dump Solenoid Circuit
4 * Open/grounded Valve Reset Circuit
5 Excessive Dump Solenoid Activity
6 Erratic Speed Sensor Circuit
7 No Isolation Solenoid during self-check
8 No dump solenoid During Self-check
9 High Speed Sensor resistance
10 Low speed Sensor resistance
11 Stop lamp Circuit Always Closed
12 Loss Of Hydraulic Fluid During Anti-lock Stop
13 Anti-lock Electrical Control Unit Failure
16 or more. Drive test.

* Red brake warning lamp illuminated

DTC 332 - Insufficient exhaust gas recirculation flow detected. This code points to a problem in the EGR syste4m vacuum supply. either a broken or disconnected vacuum line and/or connection. It could be a blocked EGR passage. Hook up a hand vacuum pump to the EGR valve. Start and run the engine until it reaches normal operation temperature, usually after the cooling fan kicks on and off.

Slowly apply vacuum to the EGR valve and observe the idle quality. If there is no change in idle quality while opening the EGR valve until it is fully open, you have clogged EGR passages.

DTC 543 Fuel pump secondary circuit failure. If you have this code and the engine runs, it is a false code. I would clear all the codes, drive the car for a while and recheck them to see what, if any, codes come back.

Additional Information provided courtesy of ALLDATA

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