See Figure 1
- Raise and safely support the vehicle so that all four wheels are off of the ground on jackstands. Keep the vehicle as close as possible to a horizontal state.
- Confirm that there is no dragging in the rear brake.
- Warm up the engine.
- Keep the 4WD vehicle in the 2H condition.
- Keep the engine in an idling condition. In case of a manual transmission, put the shift lever in the 4th gear. In the case of an automatic transmission, put the shift lever in the D range and after depressing the accelerator pedal once, allow the engine to idle again.
- While running the rear wheels, depress the brake pedal (also depress the clutch pedal for vehicles with a manual transmission) with a force of 22-66 lbs. (100-300 N). Measure the time when the wheels have stopped running. The standard value for normal conditions is 3-5 seconds, and while the G-sensor is disconnected it should take less than 1 second.
- If the G-sensor is connected and the wheels stop too soon or too late, the modulator is malfunctioning. Have the modulator checked by an automotive mechanic familiar with Mopar vehicles.
- Also check that the resistance value between the terminals of the electrical connector is 4.3 ohms for terminals 1 and 2 (release valve) and 5.0 ohms for terminals 3 and 4 (hold valve).
- If any of these tests is failed, the modulator unit must be replaced with a new unit.
REMOVAL & INSTALLATION
See Figure 2
- The modulator unit is located under the right-hand bed of the Pick-up, in front of the rear right wheel. Remove a heat shield, if so equipped.
- Disconnect the vacuum hose, brake fluid lines and electrical connectors from the modulator unit.
- Unbolt the modulator bracket from the frame and remove the unit with the bracket.
- Bolt the modulator unit back to the fender with the bracket.
- Attach the vacuum hose, the two brake lines and the electrical connector. Tighten the brake lines to 12 ft. lbs. (17 Nm).
- Bleed the brake system.