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NO.11 NO COOL AIR

BME070300000W13

11 | No cool air
DESCRIPTION | • Magnetic clutch does not operate.
POSSIBLE CAUSE | • A/C compressor system malfunction • Incorrect amount of refrigerant • A/C switch indicator light malfunction • PCM A/C cut-off control system • PCM (IG1 signal) system malfunction
• Thermosensor, A/C switch malfunction
• PCM (A/C signal) system malfunction
• Refrigerant pressure switch malfunction
• PCM cooling fan control system
• A/C relay, magnetic clutch malfunction

• 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.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT AIR BLOW OUT • Does air blow out? | Yes | Go to next step.
No | Go to Step 1 of troubleshooting indexes No.1, 2, 6, and 7.
2 | INSPECT A/C COMPRESOR OPERATION • Start engine. • Turn both A/C switch and front fan switch on. • Does A/C compressor operate? | Yes | Go to Step 1 of troubleshooting index No.10.
No | Go to next step.
3 | INSPECT REFRIGERANT AMOUNT • Inspect refrigerant amount. (See REFRIGERANT SYSTEM PERFORMANCE TEST.) • Is it okay? | Yes | Go to next step.
No | Add or subtract refrigerant to specified level, then go to Step 28.
4 | INSPECT A/C SWITCH INDICATOR LIGHT • Does A/C switch indicator light illuminate? | Yes | Go to Step 8.
No | Go to next step.
*5 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND FRONT CLIMATE CONTROL UNIT FOR CONTINUITY • Turn ignition switch to ON position. • Turn both A/C switch and front fan switch on. • Remove airflow mode wire, and air mix wire and pull out front climate control unit.
• Test voltage at front climate control unit terminal B (IG2 signal).
• Is voltage approximately B+?
Yes
Go to next step.
No | Repair wiring harness between fuse block and front climate control unit, then go to Step 28.
*6 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMARE CONTROL UNIT AND RESISTOR FOR CONTINUITY • Turn ignition switch to ON position. • Turn front fan switch off. • Test voltage at front climate control unit connector terminal F (blower fan signal). • Is voltage approximately B+? | Yes | Go to next step.
No | Inspect wiring harness between front climate control unit and resistor, then go to Step 28.
*7 | VERIFY WHETHER MALFUNCTION IS IN WIRING HARNESS (BETWEEN FRONT CLIMATE CONTROL UNIT AND GROUND FOR CONTINUITY) OR FRONT CLIMATE CONTROL UNIT • Turn ignition switch to LOCK position. • Is there continuity between front climate control unit connector terminal D (GND signal) and ground? | Yes | Replace front climate control unit, then go to Step 28.
No | Repair wiring harness between front climate control unit and ground, then go to Step 28.
8 | CHECK FOR DTCS IN PCM • Check the DTC for the ON-BOARD DIAGNOSTIC (ENGINE CONTROL). • Are any DTCs displayed? | Yes | Go to appropriate inspection procedure. (The PCM's A/C cut off control input signal may be the cause of the trouble.)
No | Go to next step.
*9 | VERIFY WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH SYSTEM OR ELSEWHERE • Remove A/C relay. • Turn ignition switch to ON position. • When A/C relay connector terminal C and D (on wiring harness side) are shorted, does magnetic clutch operate? | Yes | Go to next step.
No | Go to Step 24.
*10 | VERIFY WHETHER MALFUNCTION IS IN THERMOSENSOR SYSTEM OR ELSEWHERE • Turn ignition switch to LOCK position. • Disconnect refrigerant pressure switch connector. • Turn ignition switch to ON position. • Set front fan switch at first speed.
• Test voltage at the following refrigerant pressure switch connector terminals (A/C signal) on wiring harness side.

  - Terminal C

• Is voltage approximately B+ when A/C switch is off and 0 V when it is on?
Yes
Go to Step 16.
No | Reconnect refrigerant pressure switch connector, then go to next step.
*11 | VERIFY WHETHER MALFUNCTION IS IN THERMOSENSOR AND WIRING HARNESS (BETWEEN FUSE BLOCK AND THERMOSENSOR FOR CONTINUITY) OR ELSEWHERE • Disconnect thermosensor connector. • Start engine. • Turn both A/C switch and front fan switch on. • When thermosensor connector terminals B and C (on wiring harness side) are shorted, does cool air blow out? | Yes | Undo short, then go to next step.
No | Undo short, then go to Step 13.
*12 | VERIFY WHETHER MALFUNCTION IS IN THERMOSENSOR OR WIRING HARNESS (BETWEEN FUSE BLOCK AND THERMOSENSOR FOR CONTINUITY) • Turn ignition switch to ON position. • Test voltage at thermosensor connector terminal A (IG2 signal) on wiring harness side.
• Is voltage approximately B+?
Yes
Inspect thermosensor, then go to Step 28.
No | Repair wiring harness between fuse block and thermosensor, then go to Step 28.
*13 | INSPECT WIRING HARNESS BETWEEN THERMOSENSOR AND REFRIGERANT PRESSURE SWITCH FOR SHORT TO B+ • Turn ignition switch to ON position. • Test voltage at thermosensor connector terminal C (A/C signal) on wiring harness side. • Is voltage approximately B+? | Yes | Repair wiring harness between thermosensor and refrigerant pressure switch, then go to Step 28.
No | Go to next step.
*14 | INSPECT WIRING HARNESS BETWEEN THERMOSENSOR AND REFRIGERANT PRESSURE SWITCH FOR CONTINUITY • Turn ignition switch to LOCK position. • Inspect for continuity between the following thermosensor connector terminals (A/C signal) and refrigerant pressure switch connector terminals.

  - Terminal C-Terminal C

• Is there continuity?
Yes
Go to next step.
No | Repair wiring harness between refrigerant pressure switch and thermosensor, then go to Step 28.
*15 | INSPECT WIRING HARNESS BETWEEN FRONT CLIMATE CONTROL UNIT AND THERMOSENSOR FOR CONTINUITY • Is there continuity between front climate control unit connector terminal I and thermosensor connector terminal B. | Yes | Replace front climate control unit.
No | Repair wiring harness between front climate control unit and thermosensor.
*16 | VERIFY WHETHER MALFUNCTION IS IN PCM AND WIRING HARNESS (BETWEEN PCM AND REFRIGERANT PRESSURE SWITCH FOR CONTINUITY) OR ELSEWHERE • Turn ignition switch to ON position. • Test voltage at the following refrigerant pressure switch connector (on wiring harness side) terminal (A/C signal).

  - Terminal A

• Is voltage approximately B+?
Yes
Go to Step 18.
No | Go to next step.
*17 | VERIFY WHETHER MALFUNCTION IS IN PCM OR WIRING HARNESS (BETWEEN PCM AND REFRIGERANT PRESSURE SWITCH FOR CONTINUITY) • Test voltage at PCM connector terminal 41 (A/C signal). • Is voltage approximately B+? | Yes | Repair wiring harness between PCM and refrigerant pressure switch, then go to Step 28.
No | Inspect PCM, then go to Step 28.
*18 | VERIFY WHETHER MALFUNCTION IS IN REFRIGERANT PRESSURE SWITCH OR ELSEWHERE • When the following refrigerant pressure switch connector terminals (on wiring harness side) are shorted, does cool air blow out?

  - Terminal A-Terminal C

Yes
Inspect refrigerant pressure switch, then go to Step 28.
No | Undo short, reconnect refrigerant pressure switch connector, then go to next step.
*19 | VERIFY WHETHER MALFUNCTION IS IN A/C RELAY SYSTEM (COIL-SIDE) OR ELSEWHERE • Turn ignition switch to ON position. • Turn A/C switch off. • Test voltage at PCM connector terminal 69 (IG1 signal). • Is voltage approximately B+? | Yes | Go to Step 23.
No | Go to next step.
*20 | INSPECT A/C RELAY (COIL-SIDE) POWER SUPPLY FUSE • Is A/C relay power supply fuse okay? | Yes | Go to next step.
No | Inspect blown fuse's circuit for short to ground. Repair or replace as necessary. Install appropriate amperage fuse.
*21 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY (COIL-SIDE) FOR CONTINUITY • Turn ignition switch to ON position. • Test voltage at A/C relay connector terminal A (IG2 signal). • Is voltage approximately B+? | Yes | Go to next step.
No | Repair wiring harness between fuse block and A/C relay, then go to Step 28.
*22 | INSPECT A/C RELAY (COIL-SIDE) • Inspect A/C relay. • Is it okay? | Yes | Repair wiring harness between A/C relay and PCM (terminal 69), then go to Step 28.
No | Replace A/C relay, then go to Step 28.
*23 | INSPECT COOLANT SYSTEM OPERATION • Inspect cooling system operation. (See FAN CONTROL MODULE INSPECTION.) | Yes | Go to next step.
No | Go to appropriate inspection procedure.
24 | INSPECT A/C RELAY (SWITCH-SIDE) POWER SUPPLY FUSE • Is A/C relay power supply fuse okay? | Yes | Go to next step.
No | Inspect blown fuse's circuit for short to ground. Repair or replace as necessary. Install appropriate amperage fuse.
*25 | INSPECT WIRING HARNESS BETWEEN FUSE BLOCK AND A/C RELAY (SWITCH-SIDE) FOR CONTINUITY • Turn ignition switch to ON position. • Test voltage at A/C relay connector terminal D (A/C control signal) • Is voltage approximately B+? | Yes | Go to next step.
No | Repair wiring harness between fuse block and A/C relay, then go to Step 28.
*26 | INSPECT A/C RELAY (SWITCH-SIDE) • Inspect A/C relay. • Is it okay? | Yes | Install A/C relay, go to next step.
No | Replace A/C relay, then go to Step 28.
*27 | VERIFY WHETHER MALFUNCTION IS IN MAGNETIC CLUTCH OR WIRING HARNESS (BETWEEN A/C RELAY AND MAGNETIC CLUTCH FOR CONTINUITY) • Test voltage at magnetic clutch connector terminal A (A/C control signal). • Is voltage approximately B+? | Yes | Inspect magnetic clutch, then go to next step.
No | Repair wiring harness between A/C relay and magnetic clutch, then go to next step.
28 | VERIFY THAT MALFUNCTION SYMPTOM OCCURS 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.