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Ford Bronco RABS Rear Antilock Light Flashes 9 Times - Code 9 Sensor Test
Reference · 1987-1991 BroncoAll 95 service procedures
Rear Anti-Lock Brake (RABS) diagnosis chart for Flashout Code 9 (high sensor resistance): test steps 9a/9b measure sensor resistance against a 2500-ohm threshold to replace sensor, module, or repair circuits 519/523.
Part of 1987-1991 Ford Bronco Service Procedures
This is a scanned page (section 12-31-32, 'Rear Antilock Brakes: Diagnosis and Testing') from a Ford service manual covering diagnostic Flashout Code 9, indicated when the yellow REAR ANTILOCK warning light flashes 9 times, signifying high sensor resistance in the rear antilock brake (RABS) system. The page presents a two-step pinpoint test table with columns for Test Step, Result, and Action to Take. Test 9a checks for an open sensor or sensor wiring: with the key off, the sensor harness connector is disconnected from the sensor on the differential and resistance is measured across the two sensor pins on the 20K ohm scale. Less than 2500 ohms leads to Test 9b; greater than 2500 ohms means the sensor must be replaced. Test 9b checks for open sensor harness wiring by measuring resistance between module harness connector pins 3 and 10; under 2500 ohms means replace the module, while over 2500 ohms directs the technician to repair an open in circuits 519 or 523 (sensor wires between sensor and module), check for loose/dirty pin connectors, and, if the defect is in the 14A107 jumper harness from the sensor to the left frame rail, replace it with original equipment high-flex wire. Pin-view illustrations of the sensor connector and the 14-pin module harness connector are included. Figure reference: CH6300-2A.
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Frequently asked questions
- What does it mean when the yellow REAR ANTILOCK light flashes 9 times?
- Flashout Code 9 indicates high sensor resistance in the rear antilock brake system, requiring tests for an open sensor or open sensor harness wiring.
- How do I test the rear antilock speed sensor for Code 9?
- Turn the key off, disconnect the sensor harness connector from the sensor on the differential, set an ohmmeter to the 20K ohm scale, and measure resistance across the two sensor pins. If resistance is greater than 2500 ohms, replace the sensor; if less, proceed to Test 9b.
- Which module connector pins are used to check the sensor harness wiring?
- In Test 9b, resistance is measured between module harness connector pins 3 and 10 after reconnecting the sensor and disconnecting the module harness connector.
- What action is taken if harness resistance is greater than 2500 ohms in Test 9b?
- Repair the open in circuits 519 or 523 (sensor wires between the sensor and module), check for loose or dirty pin connectors, and if the defect is in the 14A107 jumper harness (sensor to left frame rail), replace it with original equipment high flex wire.
- What resistance reading means the RABS module should be replaced?
- In Test 9b, if the resistance between harness connector pins 3 and 10 is less than 2500 ohms, the module should be replaced.
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