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A/C pressure sensor switch for the low pressure side location

Tiny
J-SPAZ
  • MEMBER
  • 2013 FORD FUSION
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
I'm looking for the A/C pressure sensor switch for the low pressure side. I assume it's near the accumulator/drier, but I cannot find that either.
Saturday, July 25th, 2020 AT 4:36 PM

30 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

I attached a picture of the location and the procedure.

Why do you believe that it has failed?

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

I attached a wiring diagram for you of the A/C system. Do you have a test light to do some checks?

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Roy

Removal

NOTE: Removal steps in this procedure may contain installation details.

1. WARNING: Before beginning any service procedure, refer to Safety Warnings in General Information. Failure to follow this instruction may result in serious personal injury. See: Vehicle > Initial Inspection and Diagnostic Overview

Refer to: Climate Control System Health and Safety Precautions See: Vehicle > Technician Safety Information > Climate Control System Health and Safety Precautions (General Information). See: Vehicle > Initial Inspection and Diagnostic Overview

2. Torque: 7 Nm

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Help See: Vehicle > Components > About This Information

Installation

1. To install, reverse the removal procedure.
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Saturday, July 25th, 2020 AT 4:49 PM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
That's the video I'm going off of, actually. I've tested the pressure and it's good and should be engaging the clutch. However, that's not happening. I'm grabbing the gear to do a OBD2 system check and the test light tomorrow. After the KOEO test, I'll start working on the sensors to see what it might be. Fuse is good and relay seems fine. Swapped it out with same results.
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Saturday, July 25th, 2020 AT 6:15 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, what is the pressure? What is the numbers on the high and low side?

I attached the wiring diagram for you.

You will need a voltmeter to check some voltages at the pressure sensor.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Let me know when you are ready to do some testing

https://www.2carpros.com/articles/how-to-check-wiring

Roy
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Sunday, July 26th, 2020 AT 4:29 AM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
The low side pressure is 100. The high won't read because the A/C won't cycle.
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Sunday, July 26th, 2020 AT 3:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The high side should read no matter what. Do you have a gauge set? It needs to be hooked to both the high and low side.

Roy
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Sunday, July 26th, 2020 AT 3:23 PM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
I have a gauge set and it read as indicated. I'll hook it up again tomorrow/this week to verify. However, I have zero reason to believe that the refrigerant is the issue. It worked fantastic one day and the next, it did not. Short of a line completely blowing off, I cannot see it leaking all out from one day to the next.

That being said, I got the OBD2 hooked up and it read the p0532 error. So, how likely is it the sensor is bad (which one?) Vs another electrical problem throwing the code? Is there an easy way to troubleshoot that specific sensor? Thanks, again, for all the help!
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Sunday, July 26th, 2020 AT 7:02 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You never gave me a high side reading. I need that reading and the low side while the A/C is on.

Below is the description of the code and attached is the flow chart for determining the failure.

Roy

Climate Control System - Vehicles With: Dual Automatic Temperature Control (DATC)

Pinpoint Test(s)

P0532, P0533

Normal operation and Fault Conditions

The A/C (air conditioning) pressure transducer receives a ground from the PCM (power-train control module). A 5-volt reference voltage is supplied to the A/C (air conditioning) pressure transducer from the PCM (power-train control module). The A/C (air conditioning) pressure transducer then sends a voltage to the PCM (power-train control module) to indicate the A/C (air conditioning) pressure.

DTC Fault Trigger Conditions

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Possible Sources

Wiring, terminals or connectors

A/C (air conditioning) pressure transducer

PCM (power-train control module)

Visual Inspection and Diagnostic Pre-checks

Inspect for loose or corroded PCM (power-train control module) and A/C (air conditioning) pressure transducer connections.
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Monday, July 27th, 2020 AT 4:22 AM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
Both sides read around 100 when connected with the vehicle off and cold. Upon heating, they both go up to a bit over 100. This is without the clutch engaging, of course. Ran some KOEO tests and the clutch did not engage, but fans came on. Relay test shows power being supplied through the relay. I'll hit the pinpoint tests some time this week. Just let me know where I can start and I can start the first chance I get.
Cleared the codes and the previously mentioned code is no longer coming up. During the KOEO tests, no faults are found.
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Tuesday, July 28th, 2020 AT 2:03 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, go to the clutch relay. Remove the relay and with the key on, test for power at the terminals.

You should have 2 powers with the key on.

The diagram I posted back in the beginning.

Roy
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Tuesday, July 28th, 2020 AT 2:11 PM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
Yes. Two powers with key on for relay. Relay clicks on insert, as well. No power to fuse without relay. Power to fuse (both sides) with relay in.
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Wednesday, August 5th, 2020 AT 8:19 AM
Tiny
ASEMASTER6371
  • MECHANIC
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If the relay energizes when you put it in, check for power to the compressor connector.

If it has power, the compressor is the issue.

https://www.2carpros.com/articles/replace-air-conditioner-compressor

If it does not then good chance the relay is the issue.

Roy
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Wednesday, August 5th, 2020 AT 8:30 AM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
There does not appear to be power at the compressor connector. However, the relay was the very first thing I replaced. When it didn't work, I put the old one back. I'll give the new one another shot and check for power at the compressor?
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Wednesday, August 5th, 2020 AT 9:04 AM
Tiny
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Same result. No power at compressor connector.
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Wednesday, August 5th, 2020 AT 9:09 AM
Tiny
ASEMASTER6371
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Okay, then it sounds like you have an open wire between the relay and the compressor.

Roy
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Wednesday, August 5th, 2020 AT 9:12 AM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
Great! What's the best way to trace the wire to the relay, or the most likely place for a fault? Thanks!
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Wednesday, August 5th, 2020 AT 9:35 AM
Tiny
ASEMASTER6371
  • MECHANIC
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I do not have a routing diagram of the wire. I would start at the compressor and work your way back. Look for any areas where it gets hot or the harness is damaged.

Roy
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Wednesday, August 5th, 2020 AT 9:38 AM
Tiny
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Will do. And, I'm tracing the violet/wht wire from the look of the diagram, correct?
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Wednesday, August 5th, 2020 AT 9:43 AM
Tiny
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That would be correct. That goes from pin 87 of the relay directly to the compressor.

Roy
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Wednesday, August 5th, 2020 AT 9:52 AM
Tiny
J-SPAZ
  • MEMBER
  • 16 POSTS
There appears to be a plug with 3 wires underneath the intake manifold where the wires have been pulled from the plug. The wire colors appear to be yellow/brown, green/brown, violet/green? Is this completely unrelated? It seems too coincidental to be unrelated.
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Friday, August 21st, 2020 AT 2:25 PM
Tiny
ASEMASTER6371
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Can you upload a picture of what you see so I can see it?

Roy
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Friday, August 21st, 2020 AT 2:40 PM

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