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Technical Service Bulletin
SUBJECT:

NUMBER

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DATE

MODEL(S)

SEPTEMBER 2014 MULTIPLE MODELS

ECV TYPE A/C COMPRESSOR DIAGNOSIS PROCEDURE

Description: This bulletin provides additional service procedures to assist the diagnosis of vehicles
equipped with externally controlled variable displacement (ECV Type) A/C compressors .
Refer to the applicable Shop Manual HVAC section of the vehicle , and then follow the procedures
outlined in this bulletin whenever a veh icle with the following symptom(s) are being diagnosed:
>- A/C does not get cold enough .
>- The high and/or low sides are showing abnormal system pressure on the 2manifold gauge or GOS .
•:• High side pressure should be greater than 130 PSI (896kpa , 9.1kg/cm ) du ring MAX A/C use .

NOTICE
•

The A/C Compressor Diagnosis Kit applies only for vehicles equipped with ECV type
compressors . Refer to next page for applicable models and connection configuration .

Parts Information:
An A/C Compressor Diagnosis Kit has been sent to each dealer. Additional kits can be ordered
through the PDC .
Part Name
Part Number

A/C Compressor Diagnosis Kit
00305 ACKIT TOOL

Main Connection Harness

~

..
..
.

Compressor
ECV

Extension
Harness 1

Main Connection Harness Component Parts:

CD Battery Terminal Connection Leads
G) Protection Fuse (1 OA)
® On/Off toggle switch
© 2-pin connecto r (female) for direct

Extension Harnesses :
• Extension Harness 1 for 2 Pin (small)
• Extension Harness 2 for 3 Pin

connection to the compressor or to Extension
Harness 1 or 2 (as necessary)
Circulate To : General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors , Technicians , Body Shop Manager, Fleet Repair

ECV TYPE A/C COMPRESSOR DIAGNOSIS PROCEDURE

SUBJECT:
Applicable Vehicles:
Model

Production
Range

Compressor
Part Number

RB

14MY-

977011 ROOO

BK

13MY-

977012M500
977012M600

AN

ALL

977011U500

NC

ALL

977011 U600
977011U650

BH

ALL

977013M102
977013MOOO

DH

ALL

9770181000
9770181200

VI

ALL

977013M100

GD/JK

ALL

MD/UD

14MY-

YF 2.0/2.4

ALL

977013ROOO

YF 2.0/2.4

ALL

977013V110

LF
1.6/2.0/2.4

ALL

97701C2000
97701C2100

HG

ALL

977013R200
977013V410

MD/UD

-13MY

977013X601

ECV
Connector

Diagnosis Kit
Connection Configuration

2 PIN

Main Connection Harness

2 PIN
(SMALL)

Main Connection Harness
+
Extension Harness 1

3 PIN

Main Connection Harness
+
Extension Harness 2

97701A5800

LM

ALL

9770125500

Connection configuration and type listed in the chart may be subject to change.

Warranty Information:
Normal warranty applies .

TSB #: 14-HA-001

Page 2 of 5

SUBJECT:

ECV TYPE A/C COMPRESSOR DIAGNOSIS PROCEDURE

DIAGNOSIS PROCEDURE:
I. A/C Performance Test
1. Start the engine , set the blower speed to level 2, and select MAX A/C .
>- MAX A/C: A/CON , Coldest Temperature Setting , and Recirculated Air .
2. Check system status related to the HVAC system and A/C compressor using the GOS .
>- The system status of all related components should be indicating ON .
>- If the GOS is showing the compressor status as OFF , then check the various wiring harness
and connection points from the A/C Heater Control Unit to the A/C compressor.
3. Check the A/C pressure using the GOS .
>- If the pressure is more than 130 PSI , then the A/C
system is operating normally.
o Specification: 130 PSI (896kpa, 9.1 kg/cm 2 )
>- If the pressure is out of spec, continue the diagnosis by using the A/C Compressor
Diagnosis Kit.

II. Diagnosis Kit Connection

Turn the engine OFF before disconnecting and
connecting the A/C Compressor Diagnosis Kit.

1. Disconnect the main vehicle wiring harness from the A/C
compressor.

Main wiring harness connector
2. Connect the A/C Compressor Diagnosis Kit to the A/C compressor.
>- Compressors equipped with a pigtail harness from the ECV:
o Connect to ECV pigtail harness using the Main Connection Harness of the kit.
>- Compressors not equipped with a pigtail harness from the ECV:
o Connect using the applicable Extension Harness to connect directly to the ECV.

Refer to the Applicable Vehicles chart for the connector configuration and type.
Connection configuration and type listed in the chart may be subject to change.

TSB #: 14-HA-001

Page 3 of 5

ECV TYPE A/C COMPRESSOR DIAGNOSIS PROCEDURE

SUBJECT:

Ill. ECV Resistance Test
1. Connect the B+ Red and ne ative Black power lead cli s of the dia nosis kit to a DVOM set to 0 .

Multimeter Probe Connection

Switch ON

Switch OFF

2. Turn the diagnosis kit switch to the ON position and check the ECV resistance using the DVOM .
>- Normal resistance : 10.1 - 11 .10 when AMB temperature is 77° F.
>- Resistance may vary according to the engine compartment temperature .
o Acceptable normal resistance range: (8 0 : : ; ECV Resistance::::; 14 0) .

Replace the ECV if the resistance is either less than 80 or greater than 140.
(Refer to the applicable parts catalog for the latest service part number.)
3. Repeat the A/C Performance Test after replacing the ECV.

IV. A/C Pressure Test

Before starting Step 1:
../ Turn the Engine OFF .
../ Confirm that the diagnosis kit switch is in the OFF position.
1. Connect the diagnosis kit to the vehicle battery terminals.

r

I flJ... -

,

f14,
i

~·.'

II.

>>-

Connect the Red clip to B+ terminal.
Connect the Black clip to B- terminal.

\

TSB #: 14-HA-001

Page 4 of 5

SUBJECT:

ECV TYPE A/C COMPRESSOR DIAGNOSIS PROCEDURE

2. Start the engine , set the blower speed to level 2, and select MAX A/C .
~ MAX A/C: A/C ON , Coldest Temperature Setting , and Recirculated Air.
3. Turn the diagnosis kit switch to the ON position , and then check A/C pressure .
~ Specifications below are normal pressures when the ambient temperature is 77°F .
~ Using manifold gauge: Low side 20 - 40psi , High side 140 - 190psi.
~ Using GOS: A/C pressure shown should read 130 PSI (896kpa , 9.1kg/cm 2 ) or more .

Do not run the A/C with the diagnosis kit switch in the ON position beyond 30 seconds.
The evaporator core or expansion valve may freeze and alter pressure gauge readings.
4 . If the pressure is normal using the diagnosis kit (even though it did not pass "Section I. A/C
Performance Test"):
~ Check the various wiring harness and connection points from the A/C Heater Control Unit to
the A/C compressor. Repair any damaged wiring or connections along the wiring harness.
5. If out of specification or erratic pressures are showing on the manifold gauge or the GOS:
~ Recharge the refrigerant and perform leak testing if refrigerant level is out of specification .
~ Check A/C line for blockage if there are no leaks found .
~ Check the radiator cooling fan for proper operation .
~ Repeat A/C Pressure Test to verify repair.
6. If the test results lead to out of spec compressor:
~ Check the ECV pin for bent or poor contact
condition before replacing the compressor.
~ Replace the compressor if no other faults are
found and the compressor is not operational.

V. Record Results and Finalizing Repair
1. Record the diagnosis results on the repair order.
~ Document the measured ECV resistance , pressures , and the recovered refrigerant amount.
2. If a new A/C compressor is being installed, then perform a visual check of the ECV connections .
~ ECV connection and ECV pin contact condition.
~ Repeat "Section I. A/C Performance Test" to verify system performance .
ECV connection check

Bent pin check

11

Control valve check

~------------~ ,

TSB #: 14-HA-001

Page 5 of 5