Mazda RX8 - Page 48

Does the ECT PID indicate the proper
engine coolant temperature?
(See PCM INSPECTION .)
No
Inspect for the following:
• ECT sensor
• Open or short circuit between
ECT sensor and PCM terminal
2K or 1U
Yes Go to Step 26.
13
Does the engine start with the throttle
closed?
No Go to the next step.
Yes
Inspect the drive-by-wire control
system operation.
(See Drive-by-wire Control System
Inspection .)
14
Will the engine start and run smoothly
at part throttle?
No Go to the next step.
Yes Go to the next step.
15
Connect the WDS or equivalent to the
DLC-2.
Access the RPM PID.
Does the RPM PID indicate the engine
speed when cranking engine?
No
Inspect for the following:
• Open or short circuit in
eccentric shaft position sensor
• Open or short circuit between
eccentric shaft position sensor
and PCM terminal 2U or 2X
• Open or short circuit in
eccentric shaft position sensor
harnesses
If eccentric shaft position sensor and
wiring harness are normal, go to the
next step.
Yes Go to the next step.
16
Visually inspect the eccentric shaft
position sensor and the teeth of the
pulse wheel.
Are the eccentric shaft position sensor
and the teeth of the pulse wheel
normal?
No Replace the malfunctioning parts.
Yes
Repair the suspected high-tension
leads.
17
Inspect for cracks on the high-tension
leads.
Are there any cracks on the high-
tension leads?
No Go to the next step.
18 Yes Go to the next step.
(w) RX8-Engine Troubleshooting
Page 48