Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Coolant Level Switch Signal | Indicator OFF | Indicator ON | -- | -- |
Ground | -- | Indicator ON | -- | -- |
Circuit/System Description
The low engine coolant level indicator lamp is controlled by the engine control module (ECM). The normal state of the engine coolant level switch is closed when in contact with coolant.
Reference Information
Schematic Reference
Connector End View Reference
Cooling System Connector End Views
Description and Operation
Cooling System Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
The low coolant indicator should be OFF with the engine coolant at the proper level.
Circuit/System Testing
Important: Circuit/System Verification must be performed before performing the Circuit/System Testing.
- Ignition OFF, disconnect the harness connector at the coolant level switch.
- Install a 3A fused jumper wire between the signal circuit terminal and ground.
- Engine running, verify the low coolant indicator turns OFF.
- If all circuits test normal, replace the coolant level switch.
| ⇒ | If the indicator does not turn OFF, test the signal circuit for an open/high resistance. |
| ⇒ | If the indicator turns OFF, test the ground circuit for an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Repair Verification
Verify that the low coolant indicator is OFF with the engine coolant at the proper level.
