Component Testing

Coolant Pump Relay

1. Ignition Off, disconnect the KR18 Charge Air Cooler Coolant Pump Relay.
2. Test for 90-125 Ω between terminals 85 and 86.
   • If less than 90 Ω or greater than 125 Ω

     Replace the KR18 Charge Air Cooler Coolant Pump Relay.

   • If between 90-125 Ω
3. Test for infinite resistance between the terminals listed below:
   • 30 and 86
   • 30 and 87
   • 30 and 85
   • 85 and 87
   • If less than infinite resistance

     Replace the KR18 Charge Air Cooler Coolant Pump Relay.

   • If infinite resistance
4. Install a 10 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 KR18 Charge Air Cooler Coolant Pump Relay.

   • If less than 2 Ω
6. All OK

Charge Air Cooler Coolant Pump Dynamic Test

1. Ignition On.
2. Install a jumper wire between the B+ terminal 5 and the logic circuit terminal 1. Install a 10 A fused jumper wire between the B+ circuit terminal 5 and 12 V. Install a jumper wire between the ground circuit terminal 4 and ground.
3. Verify the M10 Charge Air Cooler Coolant Pump activates.
   • If the pump does not activate 

     Replace the M10 Charge Air Cooler Coolant Pump.

   • If the pump activates 
4. All OK