TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Low Coolant Switch harness connector.
Measure the resistance of the Low Coolant Switch Signal circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
4
No
→
Repair the Low Coolant Switch Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
4
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Low Coolant Switch harness connector.
Measure the resistance of the Low Coolant Switch Ground circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Go To
5
No
→
Repair the Low Coolant Switch Ground circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
5
NOTE: Ensure the PCM harness connectors are connected.
Disconnect the Low Coolant Switch harness connector.
Connect a high impedance test light between the Low Coolant Switch harness
connector cavities.
Turn the ignition on.
After 30 seconds, is the Low Coolant Lamp on steady?
All
Yes
→
Go To
6
No
→
Replace the Low Coolant Switch.
Perform ROAD TEST VERIFICATION - VER-2.
6
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
7
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Low Coolant Switch harness connector.
Measure the resistance between ground and the Low Coolant Switch Signal circuit.
Is the resistance above 100 kohms?
All
Yes
→
Go To
8
No
→
Repair the Low Coolant Switch Signal circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
179
DRIVEABILITY - DIESEL
*CHECKING THE LOW COOLANT LAMP OPERATION —
Continued