Brake Booster Pump Inoperative Right Drive
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Tests for voltage at the coil side of the power brake booster pump relay. The IGN 1 fuse supplies power to the coil side of the power brake booster pump relay.
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Tests if ground is constantly being applied to the power brake booster pump relay.
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Tests for voltage at the switch side of the power brake booster pump relay. The EXPORT BRK fuse supplies power to the switch side of the power brake booster pump relay.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Power Brake Booster Pump Schematics Connector End View Reference: Hydraulic Brake Connector End Views | |||
1 | Did you perform the Hydraulic Brakes Diagnostic System Check? | Go to Step 2 | |
Does the test lamp illuminate? | Go to Step 3 | Go to Step 12 | |
Connect a test lamp between the brake booster vacuum sensor signal circuit of the power brake booster relay and the ignition 1 voltage circuit of the power brake booster relay. Does the test lamp turn ON? | Go to Step 5 | Go to Step 4 | |
4 | Test the brake booster sensor signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 6 |
5 | Test the brake booster sensor signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 11 |
Probe the battery positive voltage circuit of the power brake booster pump relay with a test lamp that is connected to a good ground. Does the test lamp illuminate? | Go to Step 7 | Go to Step 13 | |
7 | Connect a 3 amp fused jumper between the brake booster pump motor supply voltage circuit of the power brake booster relay and the battery positive voltage circuit of the power brake booster relay. Does the power brake booster pump motor run? | Go to Step 10 | Go to Step 8 |
8 | Test the brake booster pump motor supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 9 |
9 | Test the ground circuit of the power brake booster pump assembly for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 10 |
10 | Inspect for poor connections at the power brake booster pump relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 14 |
11 | Inspect for poor connections at the power brake booster pump assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 16 | Go to Step 15 |
12 | Repair the ignition 1 voltage circuit of the power brake booster pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
13 | Repair the battery positive voltage circuit of the power brake booster pump relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 16 | -- |
14 | Replace the power brake booster pump relay. Did you complete the replacement? | Go to Step 16 | -- |
15 | Replace the power brake booster pump assembly. Refer to Hydraulic Brake Booster Pump Assembly Replacement . Did you complete the replacement? | Go to Step 16 | -- |
16 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
