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TSB 05-01-91

RWAL Speed Sensor 2-Way Connector Repair Procedure

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Models: 1989 - 1991 Ram Truck

1990-91 (AB) RAM VAN/WAGON (RWD)
1989-91 (AD) RAM PICKUP/RAM CAB & CHASSIS/RAMCHARGER (RWD, 4WD)
                       POWER RAM CAB & CHASSIS (4WD)
1989-91 (AN) DAKOTA/DAKOTA SPORT/DAKOTA CAB & CHASES

Symptoms:

The red and amber ANTILOCK warning light illuminates and a code 9 is present during diagnosis of the Rear Wheel Antilock Brake System (RWAL) on subject vehicles. A possible cause is spread terminal on the 2-way connection for the RWAL speed sensor.  

Parts Required For Repair:

AB - Vehicles       1 Wiring assembly jumper                   PN 4487098
                             1 Tie Strap                                         PN 6015756
                             (if equipped with an 8 1/4" rear axle)

AD - Vehicles       1 Wiring assembly jumper                   PN 4487030

AN - Vehicles       1 Wiring assembly jumper                   PN 4482801  

Parts Required For Gauging:

                             1 10 Pin terminal strip                         PN 4419498

Diagnosis:

1.    Disconnect the 14-way connector at the RWAL module. The module is located:

• on D-Trucks, behind the glove box.
• on N-Trucks, on the right kick panel.
• on air conditioned B-Van, behind the glove box.
• on heater only B-Van, on the heater duct.

2.    Measure the resistance between pin 13 (white/violet-speed sensor ground) & pin 14 (red/violet speed sensor signal) on the RWAL control module connection. The resistance should be less than 2400 ohms. If resistance is greater than 2400 ohms disconnect the 2-way connector at the speed sensor (located on the rear axle).

3.    Measure the speed sensor resistance. If the resistance is less than 2400 ohms the female terminals must be inspected for spreading.

4.    Take the 10 pin gage (PN 4419498) and insert any of the pins into the female terminal on the 2-way wiring harness connector. The terminals should-mate snugly. If the gage pin is loose do not attempt to close down the female terminals. Perform the following repair procedure.

Repair:  

1.    Disconnect the speed sensor to main harness jumper harness and unsnap it from the brake line clips. 2.    Install the new jumper harness onto the brake line clips.

3.    Connect the new jumper harness onto the RWAL speed sensor.

4.    Connect the new jumper harness to the main wiring harness. On AB vehicles equipped with 8 1/4" rear axles the jumper wiring harness may be 8"-10" too long. The extra length of wiring harness should be tied back to the vehicle brake line.

5.    Verify proper resistance (under 2400 ohms) at the 14-way RWAL control module connection.

6.     Connect the 14-way RWAL control module connector.

Notes:

POLICY: Reimbursable within the provisions of the warranty.

TIME ALLOWANCE
Labor Operation No. 08-90-27-90 B, D . . . . . . . . . . 0.4 Hrs.
                                                       N . . . . . . . . . . . . 0.5 Hrs.

FAILURE CODE: X6 - TERMINALS DAMAGED