Test NTC-26A: Checking A/C System
NOTE:
Perform TEST NTC-1A: NO TROUBLE CODES (NTC) TESTS before proceeding.
NOTE:
Verify A/C system is properly charged before performing procedure.
- Using scan tool, actuate A/C clutch relay. If A/C clutch relay did not engage, go to next step. If A/C clutch relay engaged, A/C clutch is okay. Test is complete. Perform TEST VER-2A: ROAD TEST VERIFICATION .
- Turn ignition off. Remove A/C clutch relay. Using a 12-volt test light, check fused B+ circuit at A/C clutch relay connector. See A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION table. If test light is brightly illuminated, go to next step. If test light is not brightly illuminated, repair open fused B+ circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
- Using a jumper wire, connect fused B+ circuit to A/C clutch relay output circuit at A/C clutch relay connector. See A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION table. If A/C clutch did not engage, go to next step. If A/C clutch engaged, replace A/C clutch relay. Perform TEST VER-2A: ROAD TEST VERIFICATION .
- Disconnect A/C clutch 2-pin connector. Using a 12-volt test light, check voltage on A/C clutch relay output circuit at A/C clutch connector. See A/C CLUTCH CONNECTOR WIRE IDENTIFICATION table. If test light is brightly illuminated, go to next step. If test light is not brightly illuminated, repair open A/C clutch relay output circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
- Using a DVOM, check resistance of ground circuit between A/C clutch 2-pin connector and ground. See A/C CLUTCH CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, replace A/C clutch coil. Perform TEST VER-2A: ROAD TEST VERIFICATION . If resistance is 5 ohms or more, repair open ground circuit. Perform TEST VER-2A: ROAD TEST VERIFICATION .
A/C CLUTCH RELAY CONNECTOR WIRE IDENTIFICATION
| Application | Wire Color | |
|---|---|---|
| Terminal A | ||
| Fused Ignition Switch Output Circuit | Light Green/Black | |
| Terminal B | ||
| Fused B+ Circuit | Red/Brown | |
| Terminal C | ||
| A/C Clutch Relay Control Circuit | Dark Blue/Orange | |
| Terminal D | ||
| A/C Clutch Relay Output Circuit | Dark Blue/Black | |
A/C CLUTCH CONNECTOR WIRE IDENTIFICATION
| Application | Wire Color |
|---|---|
| A/C Clutch Relay Output Circuit | Dark Blue/Black |
| Ground Circuit | Black |