TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Remove the Radiator Fan Relay from the Radiator Fan Relay connector.
Connect a jumper wire between cavity 3 and cavity 4.
Turn the ignition on.
With the DRBIII
t, actuate the Radiator Fan Relay.
Do the Radiator Fans operate?
All
Yes
→ Replace the Radiator Fan Relay.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the PCM harness connector.
Measure the resistance of the Radiator Fan Relay Control circuit between the
Radiator Fan Relay harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 5
No
→ Go To 8
5
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the IPM C2 harness connector.
Measure the resistance of the (N173) Radiator Fan Relay Control circuit in the
Radiator Fan Relay harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short to ground in the (N173) Radiator Fan Relay
Control circuit, between the Radiator Fan Relay harness connec-
tor and the IPM harness connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the IPM C3 harness connector.
Measure the resistance of the (K173) Radiator Fan Relay Control circuit in the PCM
harness connector to ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the short to ground in the (K173) Radiator Fan Relay
Control circuit, between PCM harness connector and the IPM
harness connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
7
Turn the ignition off.
Disconnect IPM C2 harness connector and IPM C3 harness connector.
Measure the resistance between ground and the IPM C2 connector terminal 1of the
IPM.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the IPM Fuse & Relay Center.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 11
180
DRIVEABILITY - SBEC
P1491-RAD FAN CONTROL RELAY CIRCUIT —
Continued