NO.7 NO COOL AIR [5R55S]

7	No cool air.
DESCRIPTION	• Magnetic clutch does not operate.
POSSIBLE CAUSE	• A/C compressor system malfunction (Step 2) • Incorrect amount of refrigerant (Step 3) • A/C switch indicator light malfunction (Step 4—6) • A/C relay system malfunction (Step 7, 11—13) • Refrigerant pressure switch malfunction (Step 8) • PCM A/C cut-off control system (Step 9, 22) • PCM (IG1 signal) system malfunction (Step 10, 21) • Magnetic clutch system malfunction (Step 14) • PCM (A/C signal) system malfunction (Step 15, 16) • Evaporator A/C amplifier, A/C switch malfunction (Step 17—20)

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while doing 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 the next step.
No	Go to Step 1 of troubleshooting indexes 1, 2.
2	INSPECT A/C COMPRESSOR OPERATION • Start engine. • Turn both A/C switch and fan switch on. • Does A/C compressor operate?	Yes	Go to Step 1 of troubleshooting index 6.
No	Go to the next step.
3	INSPECT REFRIGERANT AMOUNT • Inspect refrigerant amount. • Is it okay?	Yes	Go to the next step.
No	Add or subtract refrigerant to specified level, then go to Step 23.
4	CHECK TO SEE WHETHER MALFUNCTION IS IN A/C SWITCH OR ELSEWHERE • Does A/C switch indicator light illuminate?	Yes	Go to step 7.
No	Go to the next step.
*5	INSPECT A/C SWITCH POWER SUPPLY CIRCUIT • Turn the engine switch to ON position. • Remove airflow mode wire, air intake wire and air mix wire. • Remove climate control unit. • Remove A/C switch from climate control unit and connect A/C switch connector. • Measure voltage at A/C switch terminal C (IG2 signal). • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Repair wiring harness between fuse block and A/C switch, then go to Step 23.
*6	INSPECT A/C SWITCH • Inspect A/C switch. • Is it okay?	Yes	Inspect wiring harness between A/C switch and resistor, then go to Step 23.
No	Replace A/C switch, then go to Step 23.
7	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY POWER SUPPLY OR ELSEWHERE • Are A/C relay power supply fuse okay?	Yes	Go to the next step.
No	Check for short to ground on blown fuse’s circuit. Repair or replace as necessary. Install appropriate amperage fuse.
*8	INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH OR ELSEWHERE • Remove radiator grill. • Disconnect refrigerant pressure switch connector. • Short to harness side connector terminal A and B using a jumper wire. • Turn both A/C switch and fan switch on with engine is started. • Does cool air blow out?	Yes	Inspect refrigerant pressure switch, then go to Step 23.
No	Undo short, reconnect refrigerant pressure switch connector, then go to the next step.
9	INSPECT FOR DTC IN PCM • Connect the current diagnostic tool to DLC-2. • Retrieve the PCM DTC. • Are accelerator position sensor and ECT sensor related DTCs displayed?	Yes	Go to appropriate DTC troubleshooting procedure. (See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)
No	Go to the next step.
10	INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH CONTROL CIRCUIT OR ELSEWHERE • Turn the engine switch to ON position. • Does magnetic clutch operate when A/C relay connector terminal B (IG2 signal) is grounded?	Yes	Go to Step 15.
No	Go to the next step.
*11	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY POWER SUPPLY CIRCUIT OR ELSEWHERE • Turn the engine switch to ON position. • Measure voltage at the following A/C relay connector terminals: ― Terminal A (IG2 signal) ― Terminal C (A/C control signal) • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Repair wiring harness between fuse block and A/C relay, then go to Step 23.
*12	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR ELSEWHERE • Start engine. • Turn both A/C switch and fan switch on. • Measure the voltage A/C relay terminal D (A/C control signal). • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Inspect A/C relay, then go to Step 23.
*13	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C CONTROL CIRCUIT OR ELSEWHERE • Disconnect refrigerant pressure switch connector. • Start engine. • Turn both A/C switch and fan switch on. • Measure voltage at refrigerant pressure switch connector (harness-side) terminal A (A/C control signal). • Is voltage approximately 12 V?	Yes	Reconnect refrigerant pressure switch connector, then go to the next step.
No	Repair wiring harness between A/C relay and refrigerant pressure switch, then go to Step 23.
*14	INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR WIRING HARNESS (BETWEEN REFIRGERANT PRESSURE SWITCH AND MAGNETIC CLUTCH) • Start engine. • Turn both A/C switch and fan switch on. • Measure voltage at magnetic clutch connector terminal A (A/C control signal). • Is voltage approximately 12 V?	Yes	Inspect magnetic clutch, then go to Step 23.
No	Repair wiring harness between refrigerant pressure switch and magnetic clutch, then go to Step 23.
*15	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SIGNAL OR ELSEWHERE • Turn A/C switch off. • Remove glove compartment. • Turn the engine switch to ON position. • Measure voltage at the following A/C amplifier connector terminal B (A/C signal) • Is voltage approximately 12 V?	Yes	Go to Step 17.
No	Go to the next step.
16	INSPECT TO SEE WHETHER MALFUNCTION IS IN PCM OR WIRING HARNESS (BETWEEN PCM AND A/C AMPLIFIER) • Turn the engine switch to ON position. • Measure voltage at PCM terminal 239 (A/C signal). • Is voltage approximately 12 V?	Yes	Repair wiring harness between PCM and A/C amplifier, then go to Step 23.
No	Inspect PCM, then go to Step 23.
17	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C AMPLIFIER RELATED CIRCUIT OR ELSEWHERE • Turn the engine switch to LOCK position. • Disconnect A/C amplifier connector. • Short to harness side connector terminal B and C using a jumper wire. • Start engine. • Turn both A/C switch and fan switch on. • Does cool air blow out?	Yes	Undo short, then go to the next step.
No	Go to Step 19.
18	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C AMPLIFIER OR WIRING HARNESS (BETWEEN FUSE BLOCK AND A/C AMPLIFIER) • Turn the engine switch to ON position. • Measure voltage at the A/C amplifier terminal A (IG2 signal). • Is voltage approximately 12 V?	Yes	Inspect A/C amplifier, then go to Step 23.
No	Repair wiring harness between fuse block and A/C amplifier, then go to Step 23.
19	INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SWITCH OR ELSEWHERE • Turn the engine switch to ON position. • Turn the A/C switch on. • Turn the fan switch off. • Measure voltage at A/C switch terminal D (A/C signal). • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Inspect A/C switch, then go to Step 23.
20	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN A/C AMPLIFIER AND A/C SWITCH) OR ELSEWHERE • Turn the engine switch to ON position. • Measure voltage at A/C amplifier terminal C (A/C signal). • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Repair wiring harness between A/C amplifier and A/C switch, go to Step 23.
21	INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE • Turn the engine switch to ON position. • Measure voltage at PCM terminal 128 (A/C signal). • Is voltage approximately 12 V?	Yes	Go to the next step.
No	Repair wiring harness between PCM and A/C relay, then go to Step 23.
22	INSPECT A/C CUT-OFF CONTROL RELATED SINGAL • Connect the current diagnostic tool to DLC-2. • Monitor following PCM PIDs. ― APP1 ― APP2 ― ECT • Are these monitoring value normal?	Yes	Recheck malfunction symptoms.
No	Replace input signal components, then go to the next step.
23	CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Does cool air blow out? (Is refrigerant system performance test result correct?)	Yes	Troubleshooting completed. Explain repairs to customer.
No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.

STEP

INSPECTION

ACTION

INSPECT AIR BLOW OUT

• Does air blow out?

Yes

Go to the next step.

Go to Step 1 of troubleshooting indexes 1, 2.

INSPECT A/C COMPRESSOR OPERATION

• Start engine.

• Turn both A/C switch and fan switch on.

• Does A/C compressor operate?

Yes

Go to Step 1 of troubleshooting index 6.

Go to the next step.

INSPECT REFRIGERANT AMOUNT

• Inspect refrigerant amount.

• Is it okay?

Yes

Go to the next step.

Add or subtract refrigerant to specified level, then go to Step 23.

CHECK TO SEE WHETHER MALFUNCTION IS IN A/C SWITCH OR ELSEWHERE

• Does A/C switch indicator light illuminate?

Yes

Go to step 7.

Go to the next step.

INSPECT A/C SWITCH POWER SUPPLY CIRCUIT

• Turn the engine switch to ON position.

• Remove airflow mode wire, air intake wire and air mix wire.

• Remove climate control unit.

• Remove A/C switch from climate control unit and connect A/C switch connector.

• Measure voltage at A/C switch terminal C (IG2 signal).

• Is voltage approximately 12 V?

Yes

Go to the next step.

Repair wiring harness between fuse block and A/C switch, then go to Step 23.

INSPECT A/C SWITCH

• Inspect A/C switch.

• Is it okay?

Yes

Inspect wiring harness between A/C switch and resistor, then go to Step 23.

Replace A/C switch, then go to Step 23.

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY POWER SUPPLY OR ELSEWHERE

• Are A/C relay power supply fuse okay?

Yes

Go to the next step.

Check for short to ground on blown fuse’s circuit.

Repair or replace as necessary.

Install appropriate amperage fuse.

INSPECT TO SEE WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH OR ELSEWHERE

• Remove radiator grill.

• Disconnect refrigerant pressure switch connector.

• Short to harness side connector terminal A and B using a jumper wire.

• Turn both A/C switch and fan switch on with engine is started.

• Does cool air blow out?

Yes

Inspect refrigerant pressure switch, then go to Step 23.

Undo short, reconnect refrigerant pressure switch connector, then go to the next step.

INSPECT FOR DTC IN PCM

• Connect the current diagnostic tool to DLC-2.

• Retrieve the PCM DTC.

• Are accelerator position sensor and ECT sensor related DTCs displayed?

Yes

Go to appropriate DTC troubleshooting procedure.

(See DTC TABLE [WL-C, WE-C (Thailand, General (L.H.D. R.H.D.) specs.)].)

Go to the next step.

INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH CONTROL CIRCUIT OR ELSEWHERE

• Turn the engine switch to ON position.

• Does magnetic clutch operate when A/C relay connector terminal B (IG2 signal) is grounded?

Yes

Go to Step 15.

Go to the next step.

*11

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY POWER SUPPLY CIRCUIT OR ELSEWHERE

• Turn the engine switch to ON position.

• Measure voltage at the following A/C relay connector terminals:

― Terminal A (IG2 signal)

― Terminal C (A/C control signal)

• Is voltage approximately 12 V?

Yes

Go to the next step.

Repair wiring harness between fuse block and A/C relay, then go to Step 23.

*12

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C RELAY OR ELSEWHERE

• Start engine.

• Turn both A/C switch and fan switch on.

• Measure the voltage A/C relay terminal D (A/C control signal).

• Is voltage approximately 12 V?

Yes

Go to the next step.

Inspect A/C relay, then go to Step 23.

*13

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C CONTROL CIRCUIT OR ELSEWHERE

• Disconnect refrigerant pressure switch connector.

• Start engine.

• Turn both A/C switch and fan switch on.

• Measure voltage at refrigerant pressure switch connector (harness-side) terminal A (A/C control signal).

• Is voltage approximately 12 V?

Yes

Reconnect refrigerant pressure switch connector, then go to the next step.

Repair wiring harness between A/C relay and refrigerant pressure switch, then go to Step 23.

*14

INSPECT TO SEE WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR WIRING HARNESS (BETWEEN REFIRGERANT PRESSURE SWITCH AND MAGNETIC CLUTCH)

• Start engine.

• Turn both A/C switch and fan switch on.

• Measure voltage at magnetic clutch connector terminal A (A/C control signal).

• Is voltage approximately 12 V?

Yes

Inspect magnetic clutch, then go to Step 23.

Repair wiring harness between refrigerant pressure switch and magnetic clutch, then go to Step 23.

*15

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SIGNAL OR ELSEWHERE

• Turn A/C switch off.

• Remove glove compartment.

• Turn the engine switch to ON position.

• Measure voltage at the following A/C amplifier connector terminal B (A/C signal)

• Is voltage approximately 12 V?

Yes

Go to Step 17.

Go to the next step.

INSPECT TO SEE WHETHER MALFUNCTION IS IN PCM OR WIRING HARNESS (BETWEEN PCM AND A/C AMPLIFIER)

• Turn the engine switch to ON position.

• Measure voltage at PCM terminal 239 (A/C signal).

• Is voltage approximately 12 V?

Yes

Repair wiring harness between PCM and A/C amplifier, then go to Step 23.

Inspect PCM, then go to Step 23.

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C AMPLIFIER RELATED CIRCUIT OR ELSEWHERE

• Turn the engine switch to LOCK position.

• Disconnect A/C amplifier connector.

• Short to harness side connector terminal B and C using a jumper wire.

• Start engine.

• Turn both A/C switch and fan switch on.

• Does cool air blow out?

Yes

Undo short, then go to the next step.

Go to Step 19.

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C AMPLIFIER OR WIRING HARNESS (BETWEEN FUSE BLOCK AND A/C AMPLIFIER)

• Turn the engine switch to ON position.

• Measure voltage at the A/C amplifier terminal A (IG2 signal).

• Is voltage approximately 12 V?

Yes

Inspect A/C amplifier, then go to Step 23.

Repair wiring harness between fuse block and A/C amplifier, then go to Step 23.

INSPECT TO SEE WHETHER MALFUNCTION IS IN A/C SWITCH OR ELSEWHERE

• Turn the engine switch to ON position.

• Turn the A/C switch on.

• Turn the fan switch off.

• Measure voltage at A/C switch terminal D (A/C signal).

• Is voltage approximately 12 V?

Yes

Go to the next step.

Inspect A/C switch, then go to Step 23.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN A/C AMPLIFIER AND A/C SWITCH) OR ELSEWHERE

• Turn the engine switch to ON position.

• Measure voltage at A/C amplifier terminal C (A/C signal).

• Is voltage approximately 12 V?

Yes

Go to the next step.

Repair wiring harness between A/C amplifier and A/C switch, go to Step 23.

INSPECT TO SEE WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN A/C RELAY AND PCM) OR ELSEWHERE

• Turn the engine switch to ON position.

• Measure voltage at PCM terminal 128 (A/C signal).

• Is voltage approximately 12 V?

Yes

Go to the next step.

Repair wiring harness between PCM and A/C relay, then go to Step 23.

INSPECT A/C CUT-OFF CONTROL RELATED SINGAL

• Connect the current diagnostic tool to DLC-2.

• Monitor following PCM PIDs.

― APP1

― APP2

― ECT

• Are these monitoring value normal?

Yes

Recheck malfunction symptoms.

Replace input signal components, then go to the next step.

CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

• Does cool air blow out? (Is refrigerant system performance test result correct?)

Yes

Troubleshooting completed. Explain repairs to customer.

Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.