Air-Conditioning compressor working voltage is provide by main relay which is controlled by ECM. ECM controls Air-Conditioning
compressor relay internal ground through ECM harness connector EO35 terminal No.51 of, relay pull-in. ECM has a drive circuit
which controls relay coil ground, and drive circuit is equipped with a feedback circuit to ECM. By monitoring the feedback voltage,
ECM determines whether the control circuit is open, short to ground or short to power supply.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0646
Hardware Circuit Checks
When air-conditioning is not working,
with air-conditioning relay control
circuit open or short to ground, the
DTC code will be set.
1. Air-Conditioning Relay
2. ECM
3. Air-Conditioning Relay Circuit
P0647
Hardware Circuit Checks
When air-conditioning is not working,
with air-conditioning relay control
circuit open or short to ground, the
DTC code will be set.
1. Air-Conditioning Relay
2. ECM
3. Air-Conditioning Relay Circuit
3. Schematic:
Air-conditioning System Circuit Schematic
4. Diagnostic Steps:
Air-conditioning Clutch Inoperative
2.12.7.48 DTC P0650
1. DTC Descriptor:
DTC
P0650
Fault Indicator (MIL) Malfunction
CAN network is used in vehicles. Fault lamps are controlled via the instrument panel circuit. When ECM DTC code is set to light
fault lamps, ECM sends a "Light the fault lamp" signal through the CAN network the instrument panel. The instrument panel internal
circuit light the fault lamp indicating engine fault after receiving the instruction from ECM.
2. Conditions For Setting DTC and The Fault Location:
DTC Code
DTC Detection Strategy
Conditions For Setting The DTC
(Control Strategy)
Fault Locations
P0650
Hardware Circuit Checks
Fault indicator output state and ECM
expected status does not match.
1. Instrument Cluster
2. CAN-Bus
Diagnostic Steps:
Step 1
Check other fault lights working.
(a)
Turn the ignition switch to "ON" position.
Other fault lights normal?
Yes
2-764
Control System JL4G15-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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