Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | Go to Cooling Fan System Check |
2 | Turn ON the ignition with the engine OFF. Does the heater auxiliary water pump operate? | Go to Step 3 | |
3 | Disconnect the heater auxiliary water pump connector. With a test lamp connected to a good ground, probe circuit X70 at the heater auxiliary water pump connector. Does the test lamp illuminate? | Go to Step 4 | Go to Step 5 |
4 | Connect a test lamp between circuit X70 and circuit F75 at the heater auxiliary water pump connector. Does the test lamp illuminate? | Go to Step 7 | Go to Step 6 |
5 | Repair circuit X70, X68, X67 or X868 for an open, high resistance or short to ground. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 9 | -- |
6 | Repair circuit F75 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 9 | -- |
7 | Inspect for poor connections at the heater auxiliary water pump connector. Refer to Intermittents and Poor Connections Diagnosis and Connector Repairs in Wiring Systems. Did you find the problem? | Go to Step 9 | Go to Step 8 |
8 | Replace the heater water auxiliary pump. Refer to Heater Water Auxiliary Pump Replacement . Is the repair complete? | Go to Step 9 | -- |
9 | Operate the system in order to verify the repair? Did you correct the condition? | System OK | Go to Step 2 |
