Jeep XJ. Manual — part 858
Symptom:
*CHECKING RADIATOR FAN RELAY OUTPUT
POSSIBLE CAUSES
RADIATOR FAN RELAY OPERATION
GROUND CIRCUIT OPEN
RADIATOR FAN MOTOR
FUSED B+ CIRCUIT
RADIATOR FAN RELAY OUTPUT CIRCUIT
RADIATOR FAN RELAY
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, actuate the Radiator Fan Relay.
Using a jumper wire, momentarily jumper the Fuse B+ circuit and Radiator Fan
Relay Output circuit in the Radiator Fan Relay harness connector.
Is the Radiator Fan actuating?
All
Yes
→
The Radiator Fan System operating properly at this time.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
2
Turn the ignition off.
Disconnect the Radiator Fan harness connector.
Measure the Ground circuit in the Radiator Fan harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the Ground circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
3
Disconnect the Radiator Fan harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the Radiator Fan Relay.
Measure the voltage of the Radiator Fan Relay Output circuit in the Radiator Fan
harness connector.
Is the voltage above 11.0 volts?
All
Yes
→
Replace the Radiator Fan Motor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
4
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Using a 12-volt test light connected to ground, probe the Fused B+ circuit in the PDC.
Does the test light illuminate brightly?
All
Yes
→
No
→
Repair the Fused B+ circuit. Inspect fuses and replace as neces-
sary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
193
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
5
Turn the ignition off.
Remove the Radiator Fan Relay from the PDC.
Disconnect the Radiator Fan harness connector.
Using a jumper wire, jumper the Fused B+ circuit and the Radiator Fan Output
circuit in the Radiator Fan Relay harness connector.
Measure the resistance of the Radiator Fan Relay Output circuit between the PDC
and the Radiator Fan harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→
Test Complete.
No
→
Repair the Radiator Fan Relay Output circuit for an open.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
194
DRIVEABILITY - GAS
*CHECKING RADIATOR FAN RELAY OUTPUT —
Continued
Symptom:
*CHECKING THE ENGINE COOLANT TEMPERATURE SENSOR
POSSIBLE CAUSES
ECT SENSOR OPERATION
ECT SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: The engine coolant temperature must be below 62°C (150°F).
Turn the ignition on.
With the DRBIII
t, monitor the ECT value.
Start the engine.
Does the ECT reach 82°C (180°F) and was it a smooth transition?
All
Yes
→
Test Complete.
No
→
Replace the Engine Coolant Temperature Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
195
DRIVEABILITY - GAS
Symptom:
*CHECKING THE INTAKE AIR TEMPERATURE SENSOR
POSSIBLE CAUSES
IAT SENSOR OPERATION
IAT SENSOR
TEST
ACTION
APPLICABILITY
1
NOTE: Do not allow more than 5 minutes delay during the removal of the
IAT sensor and measure the temperature.
Turn the ignition on.
With the DRBIII
t, read and record the IAT temperature value.
Remove the IAT sensor.
Using a temperature probe, measure the temperature inside the opening of the IAT
sensor.
Compare both temperature readings.
Are the temperature readings with 12°C (10°F) of one another?
All
Yes
→
Test Complete.
No
→
Replace the IAT sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
196
DRIVEABILITY - GAS
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