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Matt Hardy
Matt Hardy, ASE Certified Technician
Category: Jeep
Satisfied Customers: 920
Experience:  ASE Master Auto Tech, ASE L1, Jeep/Chrysler Dealer Tech, 18 yrs exp
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2002 Jeep Grand Cherokee Limited 4.7L has Hydraulic fan that

Customer Question

2002 Jeep Grand Cherokee Limited 4.7L has Hydraulic fan that will only come on when disconnecting the temp sensor. Was going to replace the PWM Relay and have removed the front bumper facia and also removed the vacuum resevoir but the relay is no where to be found. All data show it to be in this location. Engine is running at 210 degree on guage scanner is showing 217 degrees f. When operating the A/C the Cooling fan still does not operate. (((((Just found the relay going to replace it now and retry)))))))))))))))))))
Submitted: 5 years ago.
Category: Jeep
Customer: replied 5 years ago.
That's exactly the info I read off All Data this is no help. The PWM relay is the hydraulic fan control that operates the fan 0-100%. Your information is not helpful. I have already located the relay and parts are on the way.
Expert:  Matt Hardy replied 5 years ago.

Hello, just want to throw in my 2 cents...Grand Cherokee with hydraulic fan...there is no relay...the PCM controls it. The PWM relay is for electric fan.

Here's the pin-out info:

 

HYDRAULIC COOLING MODULE (EXCEPT 4.0L LATE BUILD) - BLACK 3 WAY

CAVCIRCUITFUNCTION
1F15 18DB/WT (DIESEL)FUSED AUTO SHUT DOWN RELAY OUTPUT
1F142 18OR/DG (GAS)FUSED AUTO SHUT DOWN RELAY OUTPUT
2K173 18LG (DIESEL)HYDRAULIC RADIATOR FAN SOLENOID CONTROL
2K173 18LG (GAS)RADIATOR FAN RELAY CONTROL
3Z500 18BKGROUND

 

 

Expert:  Matt Hardy replied 5 years ago.
So, you should have power on pin 1, ground on pin 3, and pin 2 is the control wire to the PCM.
Expert:  Matt Hardy replied 5 years ago.
Case NumberK82130004
Vehicle IssueThe Hydraulic Fan Is Not Engaging Properly. The A/C Pressure Transducer Is Reading 160 PSI All The Time.;No codes are setting. The hydraulic fan is not engaging properly. A/C high side pressure is going over 400 PSI. If the hydraulic fan is activated with the DRBIII high side pressure drops. The A/C pressure transducer and PCM may have been replaced.
System or ComponentInaccurate,Responds slow,Will Not Lock / Engage,Will Not Turn On,Blows warm air,No Cool Air;Customer Concern (No DTCs);Condensor Cooling Fan,Radiator Cooling Fan,Air Conditioning;Lower Speed / Below 25 MPH ( 40 KPH );A/C is On
RecommendationThe A/C pressure transducer is one of the PCM inputs for hydraulic cooling fan control. The A/C pressure transducer pressure can be monitored using the DRBIII®. Compare the pressure reading on the DRBIII® with your A/C pressure high side gauge pressure. Pressures should be relatively close to each other. If the A/C pressure transducer pressure readings appear to be stuck check the sensor circuit wiring for problems.
Modification Date08/29/05 3:45 PM
Expert:  Matt Hardy replied 5 years ago.

NUMBER: 07-005-02

GROUP: Cooling

DATE: Dec. 16, 2002

This bulletin is supplied as technical information only and is not an authorization for repair. No part of this publication may be reproduced, stored in a retreival system,

or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without written permission of DaimlerChrysler Corporation.

THIS BULLETIN IS BEING PROVIDED IN ADVANCE. DO NOT ORDER PARTS OR

PERFORM ANY ACTIONS RELATED TO THIS BULLETIN UNTIL JAN. 20, 2003.

SUBJECT:

Newly Released Solenoid For DTC P1499 - Hydraulic Fan Solenoid Circuit Fault

OVERVIEW:

This bulletin involves the replacement of the hydraulic fan solenoid instead

of the complete cooling fan module.

MODELS:

2001 - 2004 (WJ) Grand Cherokee

2001 - 2004 (WG) Grand Cherokee (International Markets)

NOTE: THIS BULLETIN APPLIES TO VEHICLES EQUIPPED WITH A HYDRAULIC

COOLING SYSTEM (SALES CODE NMH).

SYMPTOM/CONDITION:

The customer may experience a MIL illumination due to DTC P1499 - Hydraulic Fan

Solenoid Circuit. The MIL illumination may occur intermittently.

DIAGNOSIS:

1. Proceed with this bulletin only if the cause of the MIL illumination is due to

DTC P1499 - Hydraulic Fan Solenoid Circuit Fault.

2. Refer to the 2002 or later Jeep Grand Cherokee - Powertrain Diagnostic

Procedures Manual to properly diagnose DTC P1499.

3. If the diagnostic procedures determine that the hydraulic fan solenoid is

at fault, then perform the Repair Procedure.

NOTE: THE HYDRAULIC FAN SOLENOID LISTED BELOW HAS BEEN RELEASED

AS A SEPARATE ITEM. THE COMPLETE HYDRAULIC FAN MODULE NO LONGER

REQUIRES REPLACEMENT WHEN ONLY THE SOLENOID IS FOUND TO BE AT FAULT.

PARTS REQUIRED:

Qty. Part No. Description

1 05102210AA Solenoid, Hydraulic Fan

07-005-02 -2-

EQUIPMENT REQUIRED:

CH6000 Scan Tool (DRB III®)

CH7000/7001 J1962 Cable

REPAIR PROCEDURE:

1. With the engine off, disconnect the negative battery cable from the

negative battery terminal.

2. Raise the vehicle on a suitable lift.

3. Clean the immediate area around the hydraulic fan solenoid of any debris.

4. Disconnect the electrical harness from the hydraulic fan solenoid (Fig. 1).

Fig. 1 HYDRAULIC FAN MODULE / SOLENOID

1 - Crankshaft Pulley

2 - Ground Strap Retention Nut

3 - Ground Strap (Must Be Connected To Fan Module)

4 - Hydraulic Fan Solenoid Electrical Harness/Connector

5 - Hydraulic Fan Solenoid (Serviceable Separately)

6 - Hydraulic Fan Module

5. Have the new hydraulic fan solenoid ready for installation. Make certain that the two

o-rings are in place. Notice that the armature of the solenoid can rotate within the body

of the solenoid (coil). A T40 torx bit is used for removal and installation (Fig. 2).

-3- 07-005-02

Fig. 2 HYDRAULIC FAN SOLENOID

1 - Solenoid Armature (rotates within solenoid coil/housing)

2 - Solenoid Coil / Housing

3 - T40 Torx Fitting

4 - Solenoid Electrical Connector

5 - Two Sealing O-Rings on Armature

NOTE: IF THE SOLENOID REMOVAL AND REPLACEMENT STEPS ARE PERFORMED

QUICKLY, THEN ONLY A VERY SMALL AMOUNT OF STEERING FLUID WILL

DRIP FROM THE FAN MODULE HYDRAULIC FAN SOLENOID OPENING.

THE SMALL AMOUNT OF LEAKAGE SHOULD NOT REQUIRE PRIOR FLUID

REMOVAL FROM THE POWER STEERING RESERVOIR.

6. Hold the connector of the solenoid to prevent the solenoid body from turning, and

remove the hydraulic fan solenoid from the hydraulic fan module.

7. Immediately install the new hydraulic fan solenoid. Tighten the

solenoid to 16.2 Nm (12 ft. lbs.).

8. Connect the electrical harness to the hydraulic fan solenoid.

NOTE: IF FOR ANY REASON DURING THE REPAIR PROCEDURE THE

ELECTRICAL GROUND WIRE IS REMOVED FROM THE HYDRAULIC FAN

MODULE ASSEMBLY, THEN RECONNECT THE GROUND WIRE AND TIGHTEN

THE RETENTION NUT TO 10 NM (7.4 FT. LBS.). FAILURE TO ENSURE THE

GROUND STRAP IS PROPERLY CONNECTED COULD RESULT IN ELECTROSTATIC

DISCHARGE THAT MAY DAMAGE THE PCM.

9. Lower the vehicle.

10. Connect the negative battery cable to the battery negative terminal.

11. Verify the fluid level in the power steering reservoir. Top off the fluid level as necessary.

07-005-02 -4-

POLICY:

Reimbursable within the provisions of the warranty.

TIME ALLOWANCE:

Labor Operation

No:

Description Amount

08-30-18-91 Replace Hydraulic Fan Solenoid 0.4 Hrs.

FAILURE CODE:

ML Check Engine / Service Engine Soon

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