Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING
STEP INSPECTION
ACTION
2 Start engine.
Verify air conditioning system works.
Does A/C system work?
Yes Go to next step.
No Go to troubleshooting symptom No.1.
3 Do other indicator lights (except A/C switch
indicator light) illuminate?
Yes Operation is normal. (Reconfirm malfunction symptoms.)
No Replace heater control unit, then go to next step.
4 Is heater control unit indication incorrect?
Yes Troubleshooting completed. Explain repairs to customer.
No Reconfirm malfunction symptoms, then repeat from step 1
if malfunction reoccurs.
3 Air outlet temperature does not change.
TROUBLESHOOTING HINTS
Misunderstanding by customer
• Step 1
Malfunction in air mix actuator’s +5 V signal circuit
• Air mix actuator malfunction
• Heater control unit malfunction
• Malfunction in wiring harness between heater control unit and air mix actuator
Malfunction in air mix actuator’s potentiometer input signal circuit
• Malfunction in wiring harness between heater control unit and air mix actuator
Malfunction In air mix actuator’s actuator control signal circuit
• Malfunction in wiring harness between heater control unit and air mix actuator
Malfunction in air mix actuator’s motor drive signal circuit
• Malfunction in wiring harness between heater control unit and air mix actuator
Malfunction in heater unit’s air mix link circuit
• Step 14 ,1 5
Malfunction in air mix actuator circuit
• Air mix actuator malfunction
Malfunction in heater unit’s air mix door circuit
• Heater control unit malfunction
• Air mix door malfunction
STEP
INSPECTION
ACTION
Does engine start-up at normal operating
temperature?
Yes Go to next step.
No Warm engine for approximately 10 minutes, then go to
step 19.
Is air mix actuator fixed to MAX HOT or MAX
COLD?
Yes Go to next step.
No Go to step 10.
Is air mix actuator fixed to MAX HOT?
Yes
Go to next step.
No
Go to step 8. (It fixes to MAX COLD.)
4 «
Turn ignition switch to ON.
Measure voltage at terminal G (+5 V signal) of
air mix actuator oonnector.
Is voltage approximately 5 V?
Yes Go to step 7.
A I R M I X A C T U A T O R
No Go to next step.
r
G
X
c *
H F D
*
W 6 U 7 0 1 W A 2
07
0 7 -0 1 -3