DESCRIPTION
When the power switch is turned on (IG), auxiliary battery voltage is applied to the IG2 terminal of the FC control ECU. The output signal from the RLFC terminal of the FC control ECU causes current to flow to the coil of the FC-IGCT relay, closing the contacts of the FC-IGCT relay and supplying power to terminals +B1 and +B2 of the FC control ECU.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses of circuits related to this system before performing the following procedure.
When the vehicle is parked with the power switch off, if the FC control ECU judges that the FC stack temperature will go below 0°C (32°F), it activates the FC air compressor, hydrogen pump and FC cooling water pump for a maximum of 180 seconds and drains water from the FC stack assembly. When performing inspection or repairs with the power switch off (not on (IG) or on (READY)), disconnect the cable from the negative (-) auxiliary battery terminal before performing work (If the auxiliary battery voltage is needed to conduct inspection, warm up the FC system beforehand).
PROCEDURE
CHECK TERMINAL VOLTAGE (+B1, +B2)
Disconnect the FC control ECU connector.
*a | Front view of wire harness connector (to FC Control ECU) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the FC control ECU connector.
Result | |||
---|---|---|---|
|
NG |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC-IGCT RELAY) Click here |
OK |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC-IGCT RELAY)
Remove the FC-IGCT relay from the motor compartment relay block.
Turn the power switch on (IG).
*1 | Motor Compartment Relay Block |
*2 | FC-IGCT Relay Holder |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Turn the power switch off.
Reinstall the FC-IGCT relay.
Result | |||
---|---|---|---|
|
NG |
REPLACE FC CONTROL ECU Click here |
OK |
CHECK TERMINAL VOLTAGE (IG2)
Disconnect the FC control ECU connector.
Turn the power switch on (IG).
*a | Front view of wire harness connector (to FC Control ECU) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Turn the power switch off.
Reconnect the FC control ECU connector.
Result | |||
---|---|---|---|
|
NG |
CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - NO. 1 INTEGRATION RELAY) Click here |
OK |
CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - BODY GROUND)
Disconnect the FC control ECU connector.
*a | Front view of wire harness connector (to FC Control ECU) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the FC control ECU connector.
Result | |||
---|---|---|---|
|
OK |
END |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - NO. 1 INTEGRATION RELAY)
Disconnect the FC control ECU connector.
Remove the No. 1 integration relay from the motor compartment relay block.
Measure the resistance according to the value(s) in the table below.
*1 | No. 1 Integration Relay | - | - |
*a | Front view of wire harness connector (to No. 1 Integration Relay) |
*b | Front view of wire harness connector (to FC Control ECU) |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reinstall the No. 1 integration relay.
Reconnect the FC control ECU connector.
Result | |||
---|---|---|---|
|
OK |
GO TO ECU POWER SOURCE CIRCUIT (HYBRID CONTROL SYSTEM) Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF FC-IGCT RELAY)
*1 | Motor Compartment Relay Block |
*2 | FC-IGCT Relay Holder |
Remove the FC-IGCT relay from the motor compartment relay block.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
Reinstall the FC-IGCT relay.
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT RELAY (FC-IGCT)
Result | |||
---|---|---|---|
|
NG |
REPLACE RELAY (FC-IGCT) |
OK |
CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC-IGCT RELAY)
Disconnect the FC control ECU connector.
Remove the FC-IGCT relay from the motor compartment relay block.
Measure the resistance according to the value(s) in the table below.
*1 | Motor Compartment Relay Block | *2 | FC-IGCT Relay Holder |
*a | Front view of wire harness connector (to FC Control ECU) |
- | - |
Standard Resistance | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Reconnect the FC control ECU connector.
Reinstall the FC-IGCT relay.
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (FC-IGCT RELAY - BODY GROUND)
Remove the FC-IGCT relay from the motor compartment relay block.
*1 | Motor Compartment Relay Block |
*2 | FC-IGCT Relay Holder |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Reinstall the FC-IGCT relay.
Result | |||
---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (FC CONTROL ECU - FC-IGCT RELAY)
Disconnect the FC control ECU connector.
Remove the FC-IGCT relay from the motor compartment relay block.
Measure the resistance according to the value(s) in the table below.
*1 | Motor Compartment Relay Block | *2 | FC-IGCT Relay Holder |
*a | Front view of wire harness connector (to FC Control ECU) |
- | - |
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
Reconnect the FC control ECU connector.
Reinstall the FC-IGCT relay.
Result | |||
---|---|---|---|
|
OK |
CHECK FOR INTERMITTENT PROBLEMS Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |