3.
ARE THE WIRES O.K ? & ARE THE CONNECTIONS O.K ?
YES
a.
Go to "Signal Circuit Inspection" procedure
NO
a.
Repair as necessary and go to " Verification of Vehicle Repair " procedure
Check for damaged harness and terminals including rubber seals :
-. contact resistance, oxidation, corrosion, bent or broken terminals
-. harness connector connection, loose wires etc.
Check for poor connection between ECM and component :
-. backed out terminal, improper mating, broken locks and poor terminal to wire connection
ARE THE WIRES O.K ? & ARE THE CONNECTIONS O.K ?
YES
Go to "Signal Circuit Inspection" procedure
NO
Repair as necessary and go to " Verification of Vehicle Repair " procedure
DTCs listed below are stored in the scan tool
P1620/P1621
Check items with the scan tool and the multimeter
① Wiring harness inspection
② Check the fuse
③ Check the relay resistance
Specification
Resitance : below 1 Ω for open in the wire
Resitance : infinite for short to ground in the wire
Voltage : below 0.5V for short to power in the wire
Refer to the component and full circuit for connector configrations details
Turn the ignition switch ON and measure the voltage at the ECM terminal 21/C230-1.
IS THERE A BATTERY VOLTAGE ?
YES
Go to step 3
NO
Repair short in the wire between the A/C relay terminal 5 and the injector fuse (15A).
Repair short in the wire between the A/C relay terminal 1 and the A/C fuse (10A).
Repair short in the wire between the A/C relay terminal 3 and the ECM terminal 21/C230-1.
Replace the fuse if the fuse is broken
Replace the relay if the relay is defective after checking the continuity between the relay teminal 3 and terminal 5. For more detailed information, Go to "Component Inspection" procedure
Go to step 3
Connect the scan tool to the data link connector(DLC) and start the engine
Fix the A/C relay current data.
Check the A/C relay operation after turning the A/C switch ON with the blower switch I.
IS THE A/C RELAY ON PROPERLY INDICATED WITH THE A/C COMPRESSOR CLUTCH OPERATION ?
YES
Go to "Verification of Vehicle Repair" procedure
NO
Recheck short in the wire between the A/C relay terminal 3 and the ECM terminal 21/C230-1.
Go to step 7
Connect the CH A,B probe of scan tool to the A/C compressor terminal 1 and the ECM terminal 21/C230-1 in order to check the signal waveform.
Check the signal waveform after turning the A/C switch ON with the blower switch I.
WAVEFORM ANALYSIS
This test should be inspected after depressing the HOLD mode while operating the A/C system ECM terminal 21/C230-1 voltage should be dropped 0V after turning the A/C switch ON with the blower switch I while idling At the same time, A/C compressor terminal 1 should be the battery voltage.
9. IS THERE THE SIGNAL WAVEFORM PROPERLY DISPLAYED ?
YES
Go to "Verification of Vehicle Repair" procedure
NO
Recheck open or short in the wire between the A/C relay terminal 2 and the A/C compressor terminal 1.
Replace a known - good ECM and recheck. If the problem is verified, replace the ECM. For the operation condition of A/C compressor clutch, Go to "Component Inspection" procedure
Turn the ignition switch ON, and measure the voltage at the ECM terminal 21/C230-1.
IS THERE BATTERY VOLTAGE ?
YES
Go to step 3
NO
Repair open or short in the wire between the A/C relay terminal 5 and the injector fuse (15A).
Repair open or short in the wire between the A/C relay terminal 1 and the A/C fuse (10A).
Repair open or short in the wire between the A/C relay terminal 3 and the ECM terminal 21/C230-1.
Replace the fuse if the fuse is broken
Replace the relay if the relay is defective after checking the continuity between the relay teminal 3 and terminal 5. For more detailed information, Go to "Component Inspection" procedure
Go to step 3
Connect the scan tool to the data link connector(DLC) and start the engine
Fix the A/C relay current data.
Check the A/C relay operation after turning the A/C switch ON with the blower switch I.
IS THE A/C RELAY ON PROPERLY INDICATED WITH THE A/C COMPRESSOR CLUTCH OPERATION ?
YES
Go to "Verification of Vehicle Repair" procedure
NO
Recheck open or short in the wire between the A/C relay terminal 3 and the ECM terminal 21/C230-1.
Go to step 7
Connect the CH A,B probe of scan tool to the A/C compressor terminal 1 and the ECM terminal 21/C230-1 in order to check the signal waveform.
Check the signal waveform after turning the A/C switch ON with the blower switch I.
WAVEFORM ANALYSIS
This test should be inspected after depressing the HOLD mode while operating the A/C system ECM terminal 21/C230-1 voltage should be dropped 0V after turning the A/C switch ON with the blower switch I while idling At the same time, A/C compressor terminal 1 should be the battery voltage.
9. IS THERE THE SIGNAL WAVEFORM PROPERLY DISPLAYED ?
YES
Go to "Verification of Vehicle Repair" procedure
NO
Recheck open or short in the wire between the A/C relay terminal 2 and the A/C compressor terminal 1.
Replace a known - good ECM and recheck. If the problem is verified, replace the ECM. For the operation condition of A/C compressor clutch, Go to "Component Inspection" procedure
