P0646

AF : P0646. AIR CONDITIONING CLUTCH RELAY DRIVE

G92429t150 : CHECK THE GROUND SUPPLY TO THE AIR CONDITIONING CLUTCH
1. Turn the ignition switch to the ON position.
2. Disconnect the ECM electrical connector EN16.
3. Disconnect the air conditioning clutch electrical connector EN30.
4. Measure the resistance between EN30 pin 2 (B) and GROUND.

- Is the resistance less than 5 ohms?

-> Yes
REPAIR the circuit between EN30 pin 2 (B) and GROUND. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t151 : CHECK THE CIRCUIT INTEGRITY BETWEEN THE ECM AND THE AIR CONDITIONING CLUTCH
1. Apply a GROUND to the disconnected ECM electrical connector EN16 pin 34 (BG).
2. Measure the voltage at air conditioning clutch electrical connector EN30 pin 1 (RG).

- Is the voltage greater than 10 volts?

-> Yes

-> No

G92429t152 : CHECK THE AIR CONDITIONING CLUTCH RELAY TO ECM CIRCUIT FOR SHORT TO GROUND
1. Measure the resistance between EN16 pin 34 (BG) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes

-> No
INSTALL a new air conditioning compressor clutch relay. CLEAR the DTC. TEST the system for normal operation. If the DTC is repeated, INSTALL a new ECM. Before replacing an ECM, contact dealer technical support.

G92429t168 : CHECK THE CIRCUIT BETWEEN THE AIR CONDITIONING COMPRESSOR CLUTCH AND THE RELAY FOR SHORT TO BATTERY
1. Measure the voltage between EN30 pin 1 (RG) and GROUND.

- Is the voltage greater than 1 volt?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t169 : CHECK THE CIRCUIT BETWEEN THE AIR CONDITIONING COMPRESSOR CLUTCH AND THE ACCC RELAY FOR SHORT TO GROUND
1. Measure the resistance between EN30 pin 1 (RG) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t206 : CHECK THE CIRCUIT BETWEEN FUSE 23 OF THE POWER DISTRIBUTION FUSE BOX AND THE ACCC RELAY FOR SHORT TO GROUND
1. Remove Fuse 23.
2. Measure the resistance between fuse box electrical connector JB34 pin 79 and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t207 : CHECK THE ACCC RELAY BASE FOR BATTERY VOLTAGE AT PIN 3
1. Refit Fuse 23.
2. Measure the voltage between the ACCC relay base pin 3 and GROUND.

- Is the voltage greater than 10 volts?

-> Yes

-> No
Check/replace fuses. REPAIR the circuit between the relay base and the battery power bus 1. CLEAR the DTC. TEST the system for normal operation.

G92429t208 : CHECK THE CIRCUIT BETWEEN PIN 1 OF THE ACCC RELAY BASE AND THE POWER DISTRIBUTION FUSE BOX FOR SHORT TO GROUND
1. Remove Fuse 36.
2. Measure the resistance between the ACCC relay base pin 1 and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t209 : CHECK THE ACCC RELAY BASE FOR BATTERY VOLTAGE AT PIN 1
1. Refit Fuse 36.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between ACCC relay base pin 1 and GROUND.

- Is the voltage greater than 10 volts?

-> Yes

-> No
Check/replace fuses. REPAIR the circuit between the relay base and the battery power bus 2. CLEAR the DTC. TEST the system for normal operation.
This circuit includes the EMS relay, and Fuses 9 and 31

G92429t210 : CHECK THE CIRCUIT BETWEEN THE ECM AND THE ACCC RELAY BASE FOR CONTINUITY
1. Remove the ACCC relay.
2. Measure the resistance between the ECM electrical connector EN16 pin 34 (BG) and ACCC relay base pin 2.

- Is the resistance less than 5 ohms?

-> Yes

-> No
REPAIR the circuit. CLEAR the DTC. TEST the system for normal operation.

G92429t211 : CHECK THE CIRCUIT BETWEEN THE ECM AND THE ACCC RELAY BASE FOR SHORT TO BATTERY
1. Check for a voltage between the ECM electrical connector EN16 pin 34 (BG) and GROUND.

- Is the voltage greater than 1 volt?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No

G92429t212 : CHECK THE CIRCUIT BETWEEN THE ECM AND THE ACCC RELAY BASE FOR SHORT TO GROUND
1. Measure the resistance between the ECM electrical connector EN16 pin 34 (BG) and GROUND.

- Is the resistance less than 10,000 ohms?

-> Yes
REPAIR the short circuit. CLEAR the DTC. TEST the system for normal operation.

-> No
INSTALL a new ACCC relay. CLEAR the DTC. TEST the system for normal operation.