Jeep XJ. Manual — part 635
Symptom:
*CHECKING THE LOW COOLANT LAMP OPERATION
POSSIBLE CAUSES
CHECK THE LOW COOLANT SWITCH
POWERTRAIN CONTROL MODULE - CONTROL OPEN
POWERTRAIN CONTROL MODULE - CONTROL SHORTED TO GROUND
LOW COOLANT LAMP CONTROL SHORTED TO VOLTAGE
LOW COOLANT SWITCH SIGNAL CIRCUIT OPEN
LOW COOLANT SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
LOW COOLANT LAMP CONTROL CIRCUIT SHORTED TO GROUND
LOW COOLANT SWITCH - OPEN
LOW COOLANT SWITCH SIGNAL CIRCUIT SHORTED TO SWITCH GROUND
LOW COOLANT LAMP CONTROL CIRCUIT OPEN
LOW COOLANT SWITCH - INTERNAL SHORT
POWERTRAIN CONTROL MODULE - SIGNAL OPEN
LOW COOLANT LAMP BULB
POWERTRAIN CONTROL MODULE - SIGNAL SHORT TO GROUND
MESSAGE CENTER
TEST
ACTION
APPLICABILITY
1
NOTE: Ensure the engine coolant is at the proper level before continuing.
Turn the ignition on and observe the Low Coolant Lamp.
Select the outcome of this operation.
All
Lamp on for 2 seconds, then off
Lamp on continuously
Lamp inoperative
2
Turn the ignition off.
Remove the coolant from the coolant reservoir.
Turn the ignition on.
Did the Low Coolant Lamp illuminate and stay on?
All
Yes
→
The Low Coolant Lamp System is working properly.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
192
DRIVEABILITY - DIESEL
TEST
ACTION
APPLICABILITY
3
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
→
No
→
Repair the Low Coolant Switch Signal circuit for a short to
ground.
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 between the Low Coolant Switch Signal circuit and Switch
Ground circuit.
Is the resistance above 100 kohms?
All
Yes
→
No
→
Repair the Low Coolant Switch Signal and Switch Ground circuit
for a short together.
Perform ROAD TEST VERIFICATION - VER-2.
5
Turn the ignition off.
Disconnect the Low Coolant Switch harness connector.
Turn the ignition on and wait 30 seconds.
Is the Low Coolant Lamp on?
All
Yes
→
Replace the Low Coolant Switch.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
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.
Turn the ignition on and observe the Low Coolant Lamp.
Did the Low Coolant Lamp illuminate and stay on continuously?
All
Yes
→
No
→
193
DRIVEABILITY - DIESEL
*CHECKING THE LOW COOLANT LAMP OPERATION —
Continued
TEST
ACTION
APPLICABILITY
8
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Message Center harness connector.
Measure the resistance between ground and the Low Coolant Lamp Control circuit.
Is the resistance above 100 kohms?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
Repair the Low Coolant Lamp Control circuit for a short to
ground.
Perform ROAD TEST VERIFICATION - VER-2.
9
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
→
No
→
Repair the Low Coolant Switch Signal circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
10
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
→
No
→
Replace the Low Coolant Switch.
Perform ROAD TEST VERIFICATION - VER-2.
11
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.
12
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Message Center harness connector.
Turn the ignition on.
Measure the voltage of the Low Coolant Lamp Control circuit.
Is the voltage above 0.5 volt?
All
Yes
→
Repair the Low Coolant Lamp Control circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
194
DRIVEABILITY - DIESEL
*CHECKING THE LOW COOLANT LAMP OPERATION —
Continued
TEST
ACTION
APPLICABILITY
13
Turn the ignition off.
Disconnect the PCM harness connectors.
Connect a jumper wire between the Low Coolant Lamp Control circuit and ground.
Turn the ignition on.
Is the Low Coolant Lamp illuminated?
All
Yes
→
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform ROAD TEST VERIFICATION - VER-2.
No
→
14
Turn the ignition off.
Disconnect the PCM harness connectors.
Disconnect the Message Center harness connector.
Measure the resistance of the Low Coolant Lamp Control circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Low Coolant Lamp Control circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
15
Turn the ignition off.
Remove the Message Center.
Remove and inspect the Low Coolant Lamp bulb.
Is the bulb OK?
All
Yes
→
No
→
Replace the Low Coolant Lamp bulb.
Perform ROAD TEST VERIFICATION - VER-2.
16
If there are no possible causes remaining, view repair.
All
Repair
Replace the Message Center.
Perform ROAD TEST VERIFICATION - VER-2.
195
DRIVEABILITY - DIESEL
*CHECKING THE LOW COOLANT LAMP OPERATION —
Continued
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