Toyota Venza: Air Conditioning Compressor Magnetic Clutch Circuit
DESCRIPTION
When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. Then, the MGC relay turns on to operate the magnetic clutch.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Use the Techstream to check if the CAN communication system is functioning normally.
|
Result |
Proceed to |
|---|---|
|
CAN DTC is not output |
A |
|
CAN DTC is output |
B |
| B | .gif) |
GO TO CAN COMMUNICATION SYSTEM |
|
.gif)
|
2. |
INSPECT RELAY (MGC) |
|
(a) Remove the MGC relay from the engine room relay block and junction block. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
3 - 5 |
10 kΩ or higher |
|
3 - 5 |
Below 1 Ω (when battery voltage is applied to terminals 1 and 2) |
| NG | |
REPLACE RELAY (MGC) |
|
|
3. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY) |
|
(a) Remove the MGC relay from the engine room relay block and junction block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Relay block MGC relay terminal 1 - Body ground |
Ignition switch ON |
11 to 14 V |
|
*1 |
Component without relay installed (Engine Room Relay Block and Junction Block) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) |
|
(a) Disconnect the A/C amplifier connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D47-20 (MGC) - Body ground |
Ignition switch off |
Below 1 V |
|
D47-20 (MGC) - Body ground |
Ignition switch ON |
11 to 14 V |
|
*1 |
Front view of wire harness connector (to A/C Amplifier) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
INSPECT A/C AMPLIFIER |
|
(a) Reconnect the A/C amplifier connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D47-20 (MGC) - Body ground |
Ignition switch ON A/C switch: off |
11 to 14 V |
|
D47-20 (MGC) - Body ground |
Ignition switch ON A/C switch: on |
Below 1 V |
|
*1 |
Component with harness connected (A/C Amplifier) |
| NG | |
REPLACE A/C AMPLIFIER |
|
|
6. |
INSPECT A/C COMPRESSOR |
|
(a) Disconnect the A/C compressor connector. |
|
|
(b) Disconnect the magnetic clutch connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B9-3 (MG+) - d3-1 |
Always |
Below 1 Ω |
|
B9-3 (MG+) - Body ground |
Always |
10 kΩ or higher |
|
*1 |
Component without harness connected (A/C Compressor) |
|
*2 |
Component without harness connected (Magnetic Clutch) |
| NG | |
REPLACE A/C COMPRESSOR |
|
|
7. |
INSPECT MAGNETIC CLUTCH |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
(b) When connector terminal d3-1 is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.
Text in Illustration|
*1 |
Component without harness connected (Magnetic Clutch) |
| NG | |
REPLACE MAGNETIC CLUTCH |
|
|
8. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - BATTERY) |
|
(a) Remove the MGC relay from the engine room relay block and junction block. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
Relay block MGC relay terminal 5 - Body ground |
Ignition switch ON |
11 to 14 V |
|
*1 |
Component without relay installed (Engine Room Relay Block and Junction Block) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. |
CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK AND JUNCTION BLOCK - A/C COMPRESSOR) |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
Result:
|
|
| A | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
| B | |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
| C | |
REPLACE A/C AMPLIFIER |
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