NO.7 NO COOL AIR [MANUAL AIR CONDITIONER]

id0702c2812600

7
No cool air
DESCRIPTION
•  Magnetic clutch does not operate
POSSIBLE CAUSE
•  Malfunction in PCM A/C cut control system
•  Malfunction in climate control unit
•  Malfunction in refrigerant pressure sensor (L5, LF, MZ-CD 1.6 (Y6) (EURO5 emission level))
•  Malfunction in refrigerant pressure switch (except L5, LF, MZ-CD 1.6 (Y6) (EURO5 emission level))
•  Malfunction in PCM (A/C signal)
•  Malfunction in PCM (IG1 signal)
•  Malfunction in A/C compressor
•  Malfunction in A/C relay
•  Malfunction in evaporator temperature sensor
•  Malfunction in instrument cluster
•  Improper refrigerant charging amount
•  Open circuit in wiring harness between instrument cluster and climate control unit
•  Malfunction in CAN communication

•  When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly and undamaged.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
INSPECT FUSE
•  Are A/C relay power supply fuses okay?
Yes
Go to the next step.
No
Replace fuse, then go to Step 23. If fuse burns out immediately, go to the next step.
2
INSPECT AIR BLOW OUT
•  Does air blow out?
Yes
Go to the next step.
No
Go to Step 1 of troubleshooting indexes No.1 and 2.
3
INSPECT A/C COMPRESSOR OPERATION
•  Start engine.
•  Turn A/C switch and fan switch on.
•  Does A/C compressor operate?
Yes
Go to Step 1 of troubleshooting index No.6.
No
Go to the next step.
4
INSPECT FOR DTC IN PCM AND INSTRUMENT CLUSTER
•  Inspect for DTCs related to the PCM and instrument cluster on-board diagnostic system.
•  Are any DTCs displayed?
Yes
Go to appropriate inspection procedure.
No
Go to the next step.
5
DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR A/C RELAY OPERATIONAL MALFUNCTION
•  Access PCM PID ACCS using the M-MDS.
•  Start the engine and idle it.
•  Turn the PID ACCS to ON from OFF using the M-MDS simulation function.
•  Is the A/C magnetic clutch engaged?
Yes
Go to the next step.
No
Go to Step 18.
6
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C REQUEST SIGNAL OR ELSEWHERE
•  Does the cool air blow out when terminal 2P of climate control unit connector is grounded?
Yes
Go to Step 14.
No
Go to the next step. (L5, LF, MZ-CD 1.6 (Y6) (EURO5 emission level))
Go to Step 9. (except L5, LF, MZ-CD 1.6 (Y6) (EURO5 emission level))
7
DETERMINE IF MALFUNCTION CAUSE IS A/C REQUEST SIGNAL OR A/C RELAY OPERATIONAL MALFUNCTION
•  Remove the climate control unit.
•  Reconnect the climate control unit connector.
•  Measure the climate control unit terminal 2J.
•  Is the voltage within the specified?
Yes
Go to Step 14.
No
Go to the next step.
8
INSPECT TO SEE MALFUNCTION IS IN REFRIGERANT PRESSURE SENSOR OR A/C SYSTEM
•  Inspect the refrigerant pressure sensor.
•  Is it normal?
Yes
If there is no refrigerant, replace the condenser, bleed the refrigerant line for 30 min or more using the vacuum pump, and add refrigerant to specified level.
Then go to Step 23.
No
Repair or replace malfunctioning part according to inspection result, then go to Step 23.
9
INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SIGNAL CIRCUIT OR ELSEWHERE
•  Measure the voltage at the refrigerant pressure switch terminal B.
•  Is the voltage approx. 12V?
Yes
Go to Step 11.
No
Go to the next step.
10
INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN REFRIGERANT PRESSURE SWITCH AND PCM) OR PCM
•  Measure the voltage at the PCM terminal 1Y (ZY, Z6)/303 (MZ-CD 1.6 (Y6) (EURO4 emission level))/1AF (MZR-CD 2.2).
•  Is the voltage approx. 12V?
Yes
Repair wiring harness between PCM and refrigerant pressure switch, then go to Step 23.
No
Inspect the PCM.
(See PCM INSPECTION [ZY, Z6].)
(See PCM INSPECTION [MZ-CD 1.6 (Y6) (EURO4 emission level)].)
(See PCM INSPECTION [MZR-CD 2.2].)
Then go to Step 20.
11
INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH, REFRIGERANT AMOUNT OR ELSEWHERE
•  Does cool air blow out when terminals B and C of refrigerant pressure switch connector are shorted?
Yes
Go to Step 13.
No
Go to the next step.
12
INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (OPEN CIRCUIT BETWEEN REFRIGERANT PRESSURE SWITCH AND GROUND) OR ELSEWHERE
•  Does cool air blow out when refrigerant pressure switch connector terminal C and ground are shorted?
Yes
Repair or replace wiring harness between refrigerant pressure switch and ground and ground point (loose, poor contact).
Then go to Step 14.
No
Repair wiring harness between refrigerant pressure switch and ground, then go to Step 23.
13
INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH AND REFRIGERANT AMOUNT
•  Inspect the refrigerant pressure switch.
•  Is the refrigerant pressure switch normal?
Yes
If there is no refrigerant, replace the condenser, bleed the refrigerant line for 30 min or more using the vacuum pump, and add refrigerant to specified level.
Then go to Step 23.
No
Replace the refrigerant pressure switch.
Then go to Step 23.
(See REFRIGERANT PRESSURE SWITCH REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
14
SIGNAL INSPECTION FROM EVAPORATOR TEMPERATURE SENSOR TO CLIMATE CONTROL UNIT
•  Remove the climate control unit.
•  Reconnect the climate control unit connector.
•  Measure the climate control unit terminal 1C (12-pin) voltage.
•  Is the voltage within the specified?
Yes
Go to Step 16.
No
Go to the next step.
15
INSPECT EVAPORATOR TEMPERATURE SENSOR
•  Inspect the evaporator temperature sensor.
•  Is the evaporator temperature sensor normal?
Yes
Inspect and repair for open or short circuit between evaporator temperature sensor and climate control unit.
Then go to Step 23.
No
Replace the evaporator temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
Then go to Step 23.
16
SIGNAL INSPECTION FROM INSTRUMENT CLUSTER TO CLIMATE CONTROL UNIT
•  Remove the climate control unit.
•  Reconnect the climate control unit connector.
•  Start the engine and idle it.
•  Measure the climate control unit terminal 2P (16-pin) voltage while turning on and off the air conditioner by switching the control panel.
•  Is the voltage change in specified according to air control panel switching?
Specification
―  Turn on the A/C: Below 1.0 V
―  Turn off the A/C: Approx. 5 V
Yes
Replace the instrument cluster. (Instrument cluster does not receive A/C request signal from climate control unit or transmit it to PCM.) (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
Then go to Step 23.
No
Go to the next step.
17
CONTINUITY INSPECTION BETWEEN CLIMATE CONTROL UNIT AND INSTRUMENT CLUSTER
•  Inspect for open or short circuit between climate control unit terminal 2P (16-pin) and instrument cluster terminal 2I.
Is there any open or short circuit detected?
Yes
Repair for open or short circuit.
Then go to Step 23.
No
Replace the climate control unit. (A/C switch malfunction or climate control unit does not determine A/C request or transmit the A/C request signal.) (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
Then go to Step 23.
18*
INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN A/C CONTROL SIGNAL CIRCUIT (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE
•  Does cool air blow out when terminal E of A/C relay connector (A/C control signal) is grounded?
Yes
Release short, then go to the next step.
No
Go to Step 23.
19*
INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN PCM OR WIRING HARNESS (BETWEEN A/C RELAY AND PCM)
•  Test voltage at the A/C relay control signal terminal of PCM.
•  Is voltage approx. 12 V?
Yes
Inspect PCM, then go to Step 23.
No
Repair wiring harness between A/C relay and PCM, then go to Step 23.
20
INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR ELSEWHERE
•  Test voltage at the following terminal of magnetic clutch thermal protector.
―  Terminal A (magnetic clutch operation signal)
•  Is voltage approx. 12 V?
Yes
Inspect magnetic clutch, then go to Step 23.
No
Go to the next step.
21
INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY FOR LACK OF CONTINUITY
•  Test voltages at following terminals of A/C relay.
―  Terminal A (A/C relay control signal)
―  Terminal C (A/C control signal)
•  Are voltages approx. 12 V?
Yes
Go to the next step.
No
Repair wiring harness between fuse block and A/C relay, then go to Step 23.
22
INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR WIRING HARNESS (BETWEEN A/C RELAY AND MAGNETIC CLUTCH) AND EVAPORATOR TEMPERATURE SENSOR
•  Test voltage at the following terminal of A/C relay.
―  Terminal D (magnetic clutch operation signal)
•  Is voltage approx. 12 V?
Yes
Inspect wiring harness between A/C relay and magnetic clutch.
•  If above wiring harness is normal, go to the next step.
•  If above wiring harness malfunctions, repair wiring harness, then go to the next step.
No
Replace A/C relay, then go to the next step.
23
CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
•  Does cool air blow out? (Are the results of refrigerant system performance test okay?)
Yes
Troubleshooting completed. Explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.