Coolant Circulation Pump Relay -J151- / Coolant Recirculation Pump -V50-, CHECKING

WARNING: This page is about a different car, the 2010 Audi Q7, 2009 Audi Q7, 2008 Audi Q7, and 2007 Audi Q7. However, it is still accessible from the selected car via links, so may be relevant.

General Description

The Coolant Circulation Pump Relay -J151- provides the power supply voltage to the Coolant Recirculation Pump -V50- and is cycled on and off by the Engine Control Module -J623-.

Special tools and workshop equipment required

Multimeter.
Wiring Diagram.
Scan Tool.

Test Requirements

Fuses OK.
Battery voltage OK.
Switch OFF all electrical and electronic accessories.
Vehicles with Auto. Transmission, ensure Selector Lever position is in "P".
Vehicles with Man. Transmission, ensure Shifter Lever position is in "N" with Parking Brake applied.
Coolant Temperature: ≥ 80° C.
Observe all safety precautions: SAFETY PRECAUTIONS .
View clean working conditions: CLEAN WORKING CONDITIONS .
For Hybrid vehicles refer to: HIGH VOLTAGE SYSTEM GENERAL WARNINGS .

Test Procedure

Step	Procedure	Result / Action to Take
1	PERFORM: Preliminary Check to verify the customers complaint. Refer to PRELIMINARY CHECK . -- Was Complaint verified?	-- YES: GO TO: Step 2 -- NO: GATHER more information from customer about the complaint.
2	IGNITION: OFF. REMOVE: Coolant Circulation Pump Relay -J151-. Refer to appropriate repair information. IGNITION: ON. CHECK: Coolant Circulation Pump Relay -J151- socket terminals 1/86 and 5/87 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Were Values obtained?	-- YES: GO TO: Step 3 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
3	CONNECT: Jumper wire, between the Coolant Circulation Pump Relay -J151- socket terminals 3/30 and 5/87. IGNITION: ON. SPECIFIED VALUE: After-Run Coolant Pump -V51- should be heard running. IGNITION: OFF. -- Was Value obtained?	-- YES: GO TO: Step 6 -- NO: GO TO: Step 4
4	DISCONNECT: After-Run Coolant Pump -V51- harness connector. IGNITION: ON. CHECK: After-Run Coolant Pump -V51- harness connector terminal 1 to ground for voltage. IGNITION: OFF. SPECIFIED VALUE: Battery voltage. -- Was Value obtained?	-- YES: GO TO: Step 5 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
5	CHECK: After-Run Coolant Pump -V51- harness connector terminal 2 to ground for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: After-Run Coolant Pump -V51-. Refer to appropriate repair information. GO TO: Step 7 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
6	REMOVE: Jumper wire, between the Coolant Circulation Pump Relay -J151- socket terminals 3/30 and 5/87. REMOVE: Engine Control Module -J623-. Refer to appropriate repair information. CHECK: Coolant Circulation Pump Relay -J151- socket terminal 2/85 to the Engine Control Module -J623- harness connector T94 / 33 for resistance. SPECIFIED VALUE: 0.5 Ω (± 0.3 Ω). -- Was Value obtained?	-- YES: REPLACE: Coolant Circulation Pump Relay -J151-. Refer to appropriate repair information. GO TO: Step 7 -- NO: PERFORM: Visual Inspection of wiring and component. CHECK: Wiring for open, high resistance, short or harness connector for damage, corrosion, loose or broken terminals. REPAIR: Faulty wiring or connector. GO TO: Step 7
7	Final Procedure Perform a road test to verify repair. -- Does the original DTC return?	-- YES: CHECK: Engine Control Module -J623- harness connector for any damaged, pushed-out pins. REPAIR: As necessary. If all electrical connections are OK: REPLACE: Engine Control Module -J623-. Refer to appropriate repair information. Clear the DTCs. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY . Repair is complete. Generate Readiness Code. Refer to READINESS CODE . Return vehicle to Customer. -- NO: Perform the diagnostic procedure for any DTC's. If no DTC's return, the repair is complete. Return vehicle to customer.