Mazda MX-6 1998, Workshop Manual

Page: 204 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
Purge Control Inspection
1. Start and warm up the engine to the normal
operating temperature.
2. Let the engine idle.
3. Disconnect the vacuum hose between the purge
solenoid valve and the charcoal canister.
4. Put a finger to the purge solenoid valve and verify
there is no vacuum applied.
W 6 U 1 0 1 W B 2
5. If there is vacuum:
• Check the purge solenoid valve.
• Check for loose or damaged vacuum hose.
• Check wiring between purge solenoid valve
and PCM terminal 67 (short circuit).
Main Relay Operation Inspection
1. Verify the main relay clicks when the ignition
switch is turned to ON and OFF.
2. If there is no sound, inspect the following:
• Main relay.
• Harness and connector between ignition
switch and main relay.
A/C Cut Off Control Inspection
1. Start the engine and let it idle.
2. Turn the A/C switch and the fan switch ON.
3. Check if the operation sound of the A/C
compressor electromagnetic clutch is heard. (A/C
compressor starts to work.)
4. Fully open the throttle valve. Check if the A/C
compressor magnetic clutch operation sound is
heard. (A/C compressor stops to work.) Then,
3— 6 seconds after, check if the operational sound
of the A/C compressor electromagnetic clutch is
heard.
5. Turn the A/C switch and the fan switch OFF.
6. If the sound is not heard:
(1) Connect a jumper wire between both terminals
of A/C pressure switch connector.
Turn the ignition switch ON.
Turn the A/C switch and the fan switch ON.
Verify sound is heard from A/C relay.
If the operation sound is heard, check the TP
V PID.
TP V PID.
If the operation sound is not heard, check the
following:
A/C relay.
Open or short to ground circuit in wiring
harnesses and connectors (Main relay — A/C
relay — PCM terminal 69)
A/C related parts.
(2)
(3)
(4)
(5)
Ignition Timing Control Inspection
1. Connect a timing light to the engine.
2. Crank the engine.
3. Verify the timing mark (yellow) on the crankshaft
pulley and the mark on the timing belt cover are
aligned.
Specification
B T D C 6— 18° (12 ± 6°)
4. Increase engine speed and verify ignition timing is
advanced.
0 1 -0 1 A -1 76