NO.8 NO COOL AIR

8	No cool air
DESCRIPTION	• Magnetic clutch does not operate.
POSSIBLE CAUSE	• Malfunction in PCM A/C cut control system (Step 3) • Malfunction in climate control unit (Step 4) • Malfunction in refrigerant pressure switch (Steps 5, 7-9) • Malfunction in PCM (A/C signal) (Step 6) • Malfunction in PCM (IG1 signal) (Steps 10, 11) • Malfunction in A/C compressor (Step 12) • Malfunction in A/C relay (Steps 13-15) • Malfunction in evaporator temperature sensor (Step 16)

• 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.


STEP	INSPECTION		ACTION
1	INSPECT AIR BLOW OUT • Does air blow out?	Yes	Go to next step.
1	INSPECT AIR BLOW OUT • Does air blow out?	No	Go to Step 1 of troubleshooting indexes No.1 and 2.
2	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.7.
2		No	Go to next step.
3	INSPECT FOR DTC IN PCM • Inspect for DTCs related to the PCM on-board diagnostic system. • Are any DTCs displayed?	Yes	Go to appropriate inspection procedure.
3		No	Go to next step.
4	INSPECT TO SEE WHETHER MALFUNCTION IS IN CLIMATE CONTROL UNIT OR ELSEWHERE • Does cool air blow out when terminal 1P of climate control unit connector (24-pin, A/C signal) is grounded?	Yes	Replace climate control unit, then go to Step 17.
4		No	Release short, then go to next step.
5*	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SIGNAL CIRCUIT (BETWEEN REFRIGERANT PRESSURE SWITCH AND PCM) OR ELSEWHERE • Test voltage at following terminal of refrigerant pressure switch. - Terminal B (A/C signal) • Is voltage approximately 12 V?	Yes	Go to Step 7.
5*		No	Go to next step.
6*	INSPECT TO SEE WHETHER MALFUNCTION (LACK OF CONTINUITY) IS IN WIRING HARNESS (BETWEEN REFRIGERANT PRESSURE SWITCH AND PCM) OR PCM • Test voltage at A/C signal terminal of PCM. • Is voltage approximately 12 V?	Yes	Repair wiring harness between PCM and refrigerant pressure switch, then go to Step 17.
6*		No	Inspect PCM, then go to Step 17.
7	INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH, REFRIGERANT AMOUNT, OR ELSEWHERE • Does cool air blow out when terminals A and B of refrigerant pressure switch connector are shorted?	Yes	Go to Step 9.
7		No	Go to next step.
8*	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN REFRIGERANT PRESSURE SWITCH AND CLIMATE CONTROL UNIT) OR ELSEWHERE • Test voltage at following terminal of climate control unit. - Terminal 1P (24-pin, A/C signal) • Is voltage approximately 12 V?	Yes	Go to Step 10.
8*		No	Repair wiring harness between refrigerant pressure switch and climate control unit, then go to Step 17.
9	INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH OR REFRIGERANT AMOUNT • Inspect refrigerant pressure switch. • Is it okay?	Yes	If refrigerant amount is empty, replace condenser, vaccum refrigerant line more than 30 minutes by vacuum pump, and add refrigerant to specified level, then go to Step 17.
9		No	Replace refrigerant pressure switch, then go to Step 17.
10	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 next step.
10		No	Go to Step 12.
11*	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 approximately 12 V?	Yes	Inspect PCM, then go to Step 17.
11*		No	Repair wiring harness between A/C relay and PCM, then go to Step 17.
12*	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 approximately 12 V?	Yes	Inspect magnetic clutch, then go to Step 17.
12*		No	Go to next step.
13	INSPECT FUSE • Are A/C relay power supply fuses okay?	Yes	Go to next step.
13	INSPECT FUSE • Are A/C relay power supply fuses okay?	No	Replace fuse, then go to Step 17. If fuse burns out immediately, go to next step.
14	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 approximately 12 V?	Yes	Go to next step.
14		No	Repair wiring harness between fuse block and A/C relay, then go to Step 17.
15	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 approximately 12 V?	Yes	Inspect wiring harness between A/C relay and magnetic clutch. • If above wiring harness is OK, go to next step. • If above wiring harness malfunctions, repair wiring harness, then go to Step 17.
15		No	Replace A/C relay, then go to Step 17.
16	INSPECT EVAPORATOR TEMPERATURE SENSOR • Inspect evaporator temperature sensor. • Is it okay?	Yes	Go to next step.
16		No	Replace evaporator temperature sensor, then go to next step.
17	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.
17		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.