Mazda RX8 - Page 36

Connect the WDS or equivalent
to the DLC-2.
Access the TP_REL PID.
Crank the engine with the
accelerator pedal released.
Does TP_REL PID indicate the
closed throttle position?
No
Inspect for the following:
• TP sensor
• Wiring harnesses and connectors
between PCM and throttle body
! PCM terminal 1Qthrottle
body terminal E
! PCM terminal 1Jthrottle
body terminal F
! PCM terminal 2Fthrottle
body terminal C
! PCM terminal 1Mthrottle
body terminal D
Yes Go to the next step.
13
Access the ECT PID.
Does 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
Inspect the drive-by-wire control system
operation.
(See Drive-by-wire Control System
Inspection .)
14
Attempt to start the engine at part
throttle.
Does the engine 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 during engine
cranking?
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 the eccentric shaft position sensor and the
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.
(w) RX8-Engine Troubleshooting
Page 36