Mazda RX-8 Workshop Manual page 738

Diagnostic procedure
STEP INSPECTION
1 Retrieve any PCM DTC using the
M-MDS.
(See ON-BOARD DIAGNOSTIC
TEST [13B-MSP].)
Is the DTC P2299 presented?
2 Does the engine
knock/ping/detonate?
3 Verify the following:
Vacuum
connection
Air cleaner
element
No air leakage
from intake-air
system
No restriction of
intake-air system
Blockage of
intake-air system
(between MAF
sensor and
intake ports)
Ignition wiring
Fuel quality (e.g.
proper octane,
contamination,
winter/summer
blend)
MAF sensor
RESULTS
Yes Go to the P2299 troubleshooting procedure. (Drive-by-wire
system operates with brake override system.)
(See DTC P2299
No Go to the next step.
Yes Go to the symptom troubleshooting "NO.13
KNOCKING/PINGING/DETONATION-
ACCELERATION/CRUISE".
(See NO.13 KNOCKING/PINGING/DETONATION-
ACCELERATION/CRUISE
No Go to the next step.
Yes Go to the next step.
No Service if necessary.
Repeat Step 3.
ACTION
[13B-MSP].)
[13B-MSP].)