Tools Required

Did you perform the Electro-Hydraulic P/S Pump Diagnostic System Check?

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Go to Step 2

Go to Electro-Hydraulic P/S Pump Diagnostic System Check

Caution: DC and AC high-voltage is present. To reduce the risk of severe shocks and burns, the high-voltage system should be disabled any time service work is being performed on or around the high-voltage system. When in doubt, always disable the high-voltage system. The 12-volt system will still be active after the high-voltage system has been disabled.

1. Turn the ignition switch to the OFF position.
2. Disable the high voltage system. Refer to High Voltage Disabling in Battery Pack Controls.
3. Disconnect the P/S pump high voltage cable from the power steering control module (PSCM).

Important: Ensure that the A/C compressor test lead from the P/S and A/C Compressor Electrical Tester is connected to the test port on the tester, or an incorrect test result will occur.

4. Connect the P/S pump high voltage cable to the P/S and A/C Compressor Electrical Tester.

Did you complete this portion of the Electrical Test Setup?

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Go to Step 3

Go to Step 2

Important: Ensure that the black lead is connected to the EARTH connection and that the orange lead is connected to the LINE connection. Incorrect connections will result in inaccurate readings and/or tester malfunction.

1. Connect the test leads supplied with the Digital Insulation Tester to the tester.
2. Connect the black lead from the Digital Insulation Tester to the body of the P/S and A/C Compressor Electrical Tester.
3. Connect the Meggar banana plug adapter supplied with the P/S and A/C Compressor Electrical Tester to the probe on the Digital Insulation Tester.
4. Connect the RED banana plug on the P/S and A/C Compressor Electrical Tester to the Meggar banana plug adapter.

Did you complete this portion of the setup?

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Go to Step 4

Go to Step 3

1. Set the Digital Insulation Tester to the 500 Volt scale.

Important: A red LED illuminated on the right upper corner of the Digital Insulation Tester indicates that high voltage is present across the tool.

2. Set the P/S and A/C Compressor Electrical Tester to the PHASE FREQUENCY (Hz) & MEGGAR TESTS position A.
3. Lift the MEAS handle on the Digital Insulation Tester.

Is the reading within the specified range?

5 Mohms-∞

Go to Step 5

Go to Step 7

Important: A red LED illuminated on the right upper corner of the Digital Insulation Tester indicates that high voltage is present across the tool.

1. Set the P/S and A/C Compressor Electrical Tester to the PHASE FREQUENCY (Hz) & MEGGAR TESTS position B.
2. Lift the MEAS handle on the Digital Insulation Tester.

Is the reading within the specified range?

5 Mohms-∞

Go to Step 6

Go to Step 7

Important: A red LED illuminated on the right upper corner of the Digital Insulation Tester indicates that high voltage is present across the tool.

1. Set the P/S and A/C Compressor Electrical Tester to the PHASE FREQUENCY (Hz) & MEGGAR TESTS position C.
2. Lift the MEAS handle on the Digital Insulation Tester.

Is the reading within the specified range?

5 Mohms-∞

Go to Electro-Hydraulic Power Steering Pump Electrical Test

Go to Step 7

Replace the P/S pump.

Is the repair complete?

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Go to Electro-Hydraulic P/S Pump Diagnostic System Check

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