Dodge Ram Truck 1500-2500-3500. Manual — part 1265
P1499-HYDRAULIC FAN SOLENOID CIRCUIT
9 - 1982
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1499-HYDRAULIC FAN SOLENOID CIRCUIT (CONTINUED)
For the Engine circuit diagram (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES/ENGINE CON-
TROL MODULE - SCHEMATIC - ELECTRICAL)
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
Ignition on and engine running.
•
Set Condition:
An open or shorted condition in the Hydraulic Fan Solenoid control circuit is detected by the Powertrain Control
Module.
Possible Causes
RADIATOR FAN INOP
(K342) FUSED ASD RELAY OUTPUT CIRCUIT
(C240) COOLING FAN CONTROL CIRCUIT OPEN
(C240) COOLING FAN CONTROL CIRCUIT SHORTED TO GROUND
HYDRAULIC FAN
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
1.
RADIATOR FAN INOP
Ignition on, engine not running.
With the scan tool, perform the Hydraulic Fan Solenoid Test found under Engine Test and Systems Test.
Does the Radiator Fan operate properly?
Yes
>> Refer to the INTERMITTENT CONDITION Symptom (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 2
2.
(K342) FUSED ASD RELAY OUTPUT CIRCUIT
Turn the ignition off.
Disconnect the Fan Solenoid harness connector.
Ignition on, engine not running.
With the scan tool, actuate the ASD Relay.
Using a 12-volt test light connect to ground, probe the (K342) Fused
ASD Relay Output circuit at the fan solenoid.
Does the test light illuminate brightly when the ASD Relay is
actuated?
Yes
>> Go To 3
No
>> Repair the open or short to ground in the (K342) Fused
ASD Relay Output circuit. Inspect the related fuse and
repair as necessary.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1983
P1499-HYDRAULIC FAN SOLENOID CIRCUIT (CONTINUED)
3.
(C240) COOLING FAN SOLENOID CIRCUIT OPEN
Turn the ignition off.
Disconnect the PCM harness connectors.
Measure the resistance of the (C240) Cooling Fan Solenoid Control
circuit from the fan harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 4
No
>> Repair the open in the (C240) Cooling Fan Control circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
4.
(C240) COOLING FAN CONTROL CIRCUIT SHORT TO GROUND
Measure the resistance between ground and the (C240) Cooling Fan
Control circuit.
Is the resistance below 100 ohms?
Yes
>> Repair the short to ground in the (C240) Cooling Fan Con-
trol circuit.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9
- ENGINE - STANDARD PROCEDURE)
No
>> Go To 5
9 - 1984
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
DR/DH
P1499-HYDRAULIC FAN SOLENOID CIRCUIT (CONTINUED)
5.
HYDRAULIC FAN SOLENOID
Remove the ASD Relay and connect a jumper wire between the (K342) ASD Relay Output terminal and the (A14)
Fused B+ circuit to keep the ASD Output circuit powered up for this step.
Connect another jumper wire to the (C240) Hydraulic Fan Solenoid Control circuit in the PCM harness connector.
Momentarily connect the other end of the jumper wire to ground.
NOTE: Remove the jumper wires before continuing.
Did the solenoid actuate?
Yes
>> Go To 6
No
>> Replace the Hydraulid Radiator Fan.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
6.
PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
If there are no possible causes remaining, view repair.
Repair
Replace and program the Powertrain Control Module per Service Information.
Perform POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
DR/DH
ENGINE - ELECTRICAL DIAGNOSTICS - SRT-10
9 - 1985
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