Questions and Answers

Two Dodge Pickups One Problem Q. Vince, I have an identical problem in both of my Dodge Pickups. The first is a 1991 ¾-ton, 2WD, diesel, manual transmission, P/S, A/C, with approximately 230,000 miles. The second is a 1995 ¾-ton, 2WD, diesel, automatic transmission, P/S, A/C, with approximately 198,000 miles.

In both pickups, the ABS warning light (Yellow in color) and the Brake warning light are illuminated. As I've found out in hard braking situations on the highway, the ABS no longer working on either truck. No leaks have been found on the master cylinders, lines, and brake calipers and brake drums.

The linings on both trucks (front and back) are in good condition. I've also checked the fuses under the hood, under the dash, and checked every electrical connection around the master cylinder by opening and closing the connection. What may be the problem with the ABS on the two trucks?

Dave

A. We have to pull codes. The antilock control module generates and displays flash codes from the ANTILOCK indicator light to help identify the cause of an antilock system fault. The microprocessor memory will store and display only one fault code at a time. Any stored code can be displayed by grounding the service diagnostic connector. Here's how to do it.

The self test feature of the control module is activated whenever the ignition switch is turned to ON or RUN position.

If a system fault is detected, the control module illuminates the ANTILOCK light and stores the fault code in memory. Fault codes are retained in memory even after turning the ignition switch to OFF position.

Fault Code Identification:
To determine what a fault code is, first turn the ignition key to RUN position. Then momentarily ground the service diagnostic connector and count the number of times the antilock indicator light flashes.

RWAL System Fault Codes

The initial flash will be a long flash followed by a number of shorter flashes. The long flash indicates the beginning of the fault number sequence and the short flashes are a continuation of that sequence. The long flash must be counted along with the short flashes in order to obtain an accurate fault code count.

If the amber anti-lock warning and red brake lamp illuminates and a Code 9 is present during diagnosis, it may be caused by a spread terminal on the 2-way connection for the RWAL speed sensor.

Clearing Fault Codes:
To clear a fault code, disconnect the control module connector or battery for a minimum of five seconds. During system retest, wait 30 seconds to be sure the fault code does not reappear.