Refer to Engine Controls Schematics
Circuit Description
The engine coolant level switch is located in the radiator surge tank.
The engine coolant level switch is a float type switch. The PCM supplies
a voltage to the engine coolant level switch. The engine coolant level
switch is a normally open switch. When the coolant level is within
an acceptable range the engine coolant level switch closes. The switch
opens when the engine coolant level drops below a predetermined amount.
When the PCM detects a high signal voltage (switch open) from the
engine coolant level switch the PCM sends a class 2 message to the
instrument panel cluster (IPC). The IPC displays Low Engine Coolant
on the Message Center.
Conditions for the Low Engine Coolant message to display
- DTCs P0500, P0502 and P0503 not set.
- The engine coolant is greater than 22° C (70° F).
- The message will latch for the complete ignition cycle.
Diagnostic Aids
| • | The following conditions may cause an intermittent: |
| • | Poor connections: Check for adequate terminal tension. Refer to |
| • | Rubbed through wire insulation |
| • | Broken wire inside the insulation |
