Chrysler Voyager. Manual — part 94

Symptom:

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT

When Monitored and Set Condition:

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT

When Monitored:

With the ignition on. Battery voltage greater than 10 volts.

Set Condition:

An open or shorted circuit is detected in the radiator fan relay control

circuit. One Trip Fault.

POSSIBLE CAUSES

RADIATOR FAN RELAY INTERMITTENT OPERATION

INTERMITTENT CONDITION

GROUND CIRCUIT

FUSED B+ OUTPUT CIRCUIT

POWERTRAIN CONTROL MODULE

RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND

RADIATOR FAN RELAY CONTROL CIRCUIT OPEN (IPM)

RADIATOR FAN RELAY CONTROL CIRCUIT OPEN (PCM)

RADIATOR FAN RELAY CONTROL CIRCUIT SHORTED TO GROUND (IPM)

RADIATOR FAN RELAY CONTROL CIRCUIT SHORT TO GROUND (PCM)

INTEGRATED POWER MODULE (OPEN)

INTEGRATED POWER MODULE (SHORD)

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t, actuate the Radiator Fan Relay.

Are both Radiator Fan operating?

All

Yes

→ Go To 2

No

→ Go To 3

2

Turn the ignition on.
With the DRBIII

t, actuate the Radiator Fan Relay.

Wiggle the wiring harness from the Radiator Fan Relay to the PCM while the relay
is actuating.
Did the Radiator Fan Relay stop when wiggling the wiring harness?

All

Yes

→ Repair as necessary.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Refer to the INTERMITTENT CONDITION symptom in the

Driveability category.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

375

DRIVEABILITY - NGC

TEST

ACTION

APPLICABILITY

3

Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Using a 12-volt test light connected to 12-volts, probe the Ground circuit in the
Radiator Fan Relay harness connector.
Does the test light illuminate?

All

Yes

→ Go To 4

No

→ Repair the Ground circuit for an open.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

4

NOTE: Inspect the Radiator Fan fuse located in the IPM.
Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Measure the voltage of the Fused B+ Output circuit in the Radiator Fan harness
connector.
Is the voltage above 11.0 volts?

All

Yes

→ Go To 5

No

→ Repair the Fused B+ circuit. Check and replace any open fuses.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

5

NOTE: Ensure the Radiator Fan Relay harness connector is connected.
Turn the ignition off.
Disconnect the PCM harness connector.
Turn the ignition on.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Using a jumper wire, momentarily jumper the Radiator Fan Relay Control circuit in
the appropriate terminal of special tool # 8815 to ground.
Did the Radiator Fans operate?

All

Yes

→ Before continuing, check the PCM harness connector terminals

for corrosion, damage, or terminal push out. Repair as necessary.
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Go To 6

6

Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
Measure the resistance of the Radiator Fan Relay Control circuit between the
Radiator Fan Relay harness connector and the appropriate terminal of special tool #
8815.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 7

No

→ Go To 10

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DRIVEABILITY - NGC

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT —

Continued

TEST

ACTION

APPLICABILITY

7

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 in the Radiator Fan
Relay harness connector to ground.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 8

No

→ Replace Radiator Fan Relay.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

8

Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the IPM C2 harness connector.
Measure the resistance of the 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 Radiator Fan Relay Control circuit for a short to

ground between the Radiator Fan Relay harness connector and
the IPM harness connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Go To 9

9

Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the IPM C3 harness connector.
Measure the resistance of the Radiator Fan Relay Control circuit in the PCM harness
connector to ground.
Is the resistance below 5.0 ohms?

All

Yes

→ Repair the Radiator Fan Relay Control circuit for a short to

ground between PCM harness connector and the IPM harness
connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Replace the IPM Fuse & Relay Center.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

10

Turn the ignition off.
Disconnect the Radiator Fan Relay harness connector.
Disconnect the IPM C2 harness connector.
Measure the resistance of the Radiator Fan Relay Control circuit between the IPM
harness connector and the Radiator Fan Relay harness connector.
Is the resistance below 5.0 ohms.

All

Yes

→ Go To 11

No

→ Repair the Radiator Fan Relay Control circuit for an open

between the Radiator Fan Relay harness connector and the IPM
harness connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

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DRIVEABILITY - NGC

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT —

Continued

TEST

ACTION

APPLICABILITY

11

Turn the ignition off.
Disconnect the PCM harness connector.
Disconnect the IPM C3 harness connector.
Measure the resistance of the Radiator Fan Relay Control circuit between the IPM
harness connector and the PCM harness connector.
Is the resistance below 5.0 ohms.

All

Yes

→ Replace the IPM Fuse & Relay Center.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No

→ Repair the Radiator Fan Relay Control circuit for an open

between PCM harness connector and the IPM harness connector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.

378

DRIVEABILITY - NGC

P0480-LOW SPEED FAN CONTROL RELAY CIRCUIT —

Continued