(I)Pump Motor Operational Diagnosis

Tools Required:
94-00101-A Tech I Diagnostic Computer J 37118 Pressure Gage Assembly
1. Turn off the ignition, depressurize the Powermaster III, remove the accumulator, and connect J 37118. Install the accumulator to J 37118. Turn the ignition on and allow the pump to run for at least 20 seconds. Turn off the ignition, check for leaks, correct as necessary then depressurize the Powermaster III Unit. Perform the "Total Pump Run time Test" using 94-00101-A, simultaneously observe the pressure gauge while turning on the ignition. Is there a sudden jump from 0 to 3448 (0 psi to 500 psi) or more almost immediately after the ignition is turned on? (This initial jump in pressure is the amount of accumulator precharge). If not, and the pump motor is running, perform step 9 of test (E) "Pump Run Time Too Long". If the jump in pressure is less than 4137 kPa (600 psi), replace the accumulator.
2. Notice the pressure at which 94-00101-A indicates "OK" pressure. If this pressure is not within the 11,722 kPa to 13,101 kPa (1,700 to 1, 900 psi) range, replace the accumulator pressure switch. Notice the pressure at which the pump turns off. If it is not within the 17,927 kPa to 19, 996 kPa (2,600 to 2,900 psi) range, replace the accumulator pressure switch. If the pump continues to run but maintains a constant pressure, perform step 9 of test (E) "Pump Run Time Too Long" in this section.
NOTICE: When depressing the brake pedal to cause the pump to run, depress the brake pedal slowly and carefully until the pump just begins to run. Do not continue to depress the brake pedal after the pump begins to run or pump runs which are too short may be missed.

3. When the pump has stopped, depress the brake pedal until the pump begins to run. If this pressure is not within the 14,135 to 15,859 kPa (2,050 to 2,300 psi) range, replace the accumulator pressure switch.

4. If the accumulator pressure switch points are all within range and if accumulator precharge is greater than 4,137 kPa (600 psi) and battery voltage is greater than 11.8 volts when the pump is running, and the total pump run time is greater than 40 seconds, replace the pump and motor assembly.