TEST
ACTION
APPLICABILITY
6
Turn the ignition on.
With the DRB, actuate the Low Speed Rad Fan and observe the Radiator Fans.
NOTE: Both Radiator Fans should operate at low speed.
Did both Radiator Fans operate properly?
All
Yes
→ Go To 7
Fans do not operate on Low
Go To
15
Fan 1 on High/Fan 2 not on
Go To
23
Fan 1 not on/Fan 2 on High
Go To
26
7
Turn the ignition on.
With the DRB, actuate the High and Low Speed Rad Fans at the same time and
observe the Radiator Fans.
NOTE: Both Radiator Fans should operate at high speed.
Did both Radiator Fans operate properly?
All
Yes
→ The test is complete. Ensure the ECM will turn the fans on when
the engine is hot.
Perform ROAD TEST VERIFICATION - VER-2.
Fan 1 on High/ Fan 2 not on
Go To
8
Fan 1 not on/Fan 2 on High
Go To
11
8
Turn the ignition off.
Disconnect the Radiator Fan Relay No.2 harness connector.
Using a 12-volt test light connected to ground, check the Fused B+ circuit.
Did the test light illuminate brightly?
All
Yes
→ Go To 9
No
→ Repair the Radiator Fan Relay No.2 Fused B+ circuit for an open.
Perform ROAD TEST VERIFICATION - VER-2.
9
Turn the ignition off.
Install a substitute relay in place of Radiator Fan Relay No. 2.
Turn the ignition on.
With the DRB, actuate the High Speed Fan Relay.
Does Radiator Fan No. 2 cycle on and off?
All
Yes
→ Replace Radiator Fan Relay No. 2.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 10
215
DRIVEABILITY - DIESEL
*CHECKING THE ELECTRIC RADIATOR FAN OPERATION —
Continued