Headlight Switch; Blower Switch; A/C Switch; Water Thermoswitch Circuit (Not Included In Switch Inspection) - Mazda MX-5 1990 Workshop Manual

F
SELF-DIAGNOSIS FUNCTION
Headlight switch
Turn ON headlight switch
NO
PC: • Headlight switch malfunction
Verify that monitor lamp illuminates (Refer to section T)
l
YES
• Open circuit in wire harness from headlight switch
to engine control unit
• Engine control unit terminal 1 U malfunction
Headlight switch OK (Refer to page F-129)
Turn OFF headlight switch
05UOFX-102
•
Blower switch
Turn blower switch to "medium" position
NO
PC: • Blower switch malfunction
Verify that monitor lamp illuminates (Refer to section T)
!
YES
• Open circuit in wire harness from blower switch to
engine control unit
• Engine control unit terminal 1 S malfunction
Blower switch OK (Refer to page F-129)
Turn OFF blower switch
05UOFX-103
Ale switch
Set fan speed control to low position
NO
pc: •
AIC switch malfunction
Turn AIC switch ON, and verify that monitor lamp (Refer to Section U)
illuminates • Blower switch malfunction
!
YES
• Open circuit in wire harness from Ale switch to
blower switch
• Engine control unit terminal 1 U malfunction
Ale switch OK (Refer to page F-129)
Turn Ale switch and blower switch OFF
05UOFX-104
Water thermoswitch circuit (not included in switch inspection)
Warning
• The cooling fan operates when the diagnosis connector terminals TFA and GND are connect-
ed a jumper wire. Use caution.
Connect diagnosis connector terminals TFA and GND
NO
PC: • Relay malfunction
with a jumper wire (Refer to Section E)
Verify that monitor lamp illuminates
• Open circuit in wire harness from water thermo-
!
YES
switch to engine control unit
• Engine control unit terminal 1 R malfunction
Water thermoswitch circuit is OK
Disconnect a jumper wire
05UOFX-237
F-91