Mazda 3 - Page 90

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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• Inspect for electrical corrosion on PCM
terminals.
• Is any electrical corrosion found?
10
VERIFY TROUBLESHOOTING OF DTC
P0121 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Start the engine.
• Clear DTC from PCM memory using WDS or
equivalent.
• Access ECT, TP and MAF PIDs using WDS
or equivalent.
• Warm up the engine until ECT PID is
reading more than 70 °C {158 °F}.
• Drive the vehicle and read TP and MAF
PIDs.
• Verify PIDs reading are within specifications.
- MAF PID: more than 59.5 g/s {7.9
lb/min}
- TP PID: 12.5 % or more
• Is the PENDING CODE for this DTC
present?
Yes
Replace the PCM, then go to Step 15.
(See PCM REMOVAL/INSTALLATION
[Z6].)
No
Go to Step 15.
11
INSPECT TP SENSOR TERMINAL FOR
ELECTRICAL CORROSION
• Turn the ignition switch off.
• Disconnect the TP sensor connector.
• Inspect for electrical corrosion on TP sensor
terminals.
• Is any electrical corrosion found?
Yes
Repair or replace the terminal, then go to
Step 14.
No
Go to the next step.
12
VERIFY TP SENSOR
• Does resistance smoothly change while
gradually opening throttle valve?
Yes
Go to the next step.
No
Replace the TP sensor, then go to Step 14.
(See THROTTLE POSITION (TP) SENSOR
REMOVAL/INSTALLATION [Z6].)
13
INSPECT PCM TERMINAL FOR
ELECTRICAL CORROSION
• Disconnect PCM connector.
• Inspect for electrical corrosion on PCM and
PCM connector male and female terminals.
• Is any electrical corrosion found?
Yes
Repair terminal, then go to the next step.
No
Go to the next step.