Circuit Opening Relay; Switching Operation; Relay Circuit - Mazda MX-5 1990 Workshop Manual

F
STA
9MUOF2-150
05UOFX-158
STA
05UOFX-159
F-110
FUEL SYSTEM
CIRCUIT OPENING RELAY
Inspection
Switching operation
Apply 12V and a ground to the terminals below and check
the circuit opening relay operation as described.
12V
Grounded Correct result
STA
E1 B-Fp: Continuity
B Fc Fp: Battery voltage
If not as specified, replace the circuit opening relay.
Relay circuit
Measure voltage between the terminals and a ground with a
voltmeter.
~
Condition
Fp Fe B
STA
E1
Ignition switch: ON
OV 12V 12V OV OV
Ignition switch:
START
12V
OV 12V 12V OV
At idle
12V OV 12V OV OV
If not as specified, check the related wiring harness.
Resistance
Measure resistance between the terminals with an ohmmeter.
Between terminals Resistance (0)
STA-E1 21-43
B-FC
109-226
B-Fp
00
If not as specified, replace the circuit opening relay_
Replacement
1_ Remove the undercover.
2. Remove the circuit opening relay.
3. Install in the reverse order of removal.