Component Testing

Motor Test

1. Ignition OFF, disconnect the harness connector at the M9 Brake Booster Pump Motor. Install a 30 A fused jumper wire between the B+ circuit terminal 1 and B+. Install a jumper wire between the ground circuit terminal 2 and ground.
2. Verify the M9 Brake Booster Pump Motor activates.
   • If the brake booster pump motor does not activate 

     Replace the M9 Brake Booster Pump Motor.

   • If the brake booster pump motor activates 
3. All OK.

Relay Test

1. Ignition OFF, disconnect the KR14 Brake Booster Pump Motor Relay.
2. Test for 60-180 Ω between terminals 1 and 2.
   • If less than 60 or greater than 180 Ω 

     Replace the relay.

   • If between 60-180 Ω 
3. Test for infinite resistance between the terminals listed below:
   • 30 and 86
   • 30 and 85
   • 30 and 87
   • 85 and 87
   • If less than infinite resistance 

     Replace the relay.

   • If infinite resistance 
4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.
5. Test for less than 2 Ω between terminals 30 and 87.
   • If 2 Ω or greater  

     Replace the relay.

   • If less than 2 Ω 
6. All OK.