Mazda 3 - Dtc P0121 [Z6]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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7
INSPECT ECT SENSOR CIRCUIT FOR
OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following
terminals:
- ECT sensor terminal A (wiring
harness-side) and PCM terminal 2J
(wiring harness-side)
- ECT sensor terminal B (wiring
harness-side) and PCM terminal
2AX (wiring harness-side)
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a
possible open circuit, then go to the next step.
8
VERIFY TROUBLESHOOTING OF DTC
P0118 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the PCM memory
using the WDS or equivalent.
• Start the engine.
• Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [Z6].)
No
Go to the next step.
9
VERIFY AFTER REPAIR PROCEDURE
• Perform the "AFTER REPAIR
PROCEDURE".
(See AFTER REPAIR PROCEDURE [Z6].)
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [Z6].)
No
DTC troubleshooting completed.
DTC P0121 [Z6]
B3E010200100W08
DTC P0121
TP sensor circuit range/performance problem
DETECTION
CONDITION
• If the PCM detects that the throttle valve opening angle is less than 12.5 % for 5
s after the following conditions are met, the PCM determines that there is a TP
sensor circuit range/performance problem:
MONITORING CONDITION
- Engine coolant temperature is more than 70 °C {158 °F}.
- MAF sensor signal is more than 59.5 g/s {7.9 lb/min}.
• If the PCM detects that the throttle valve opening angle is more than 50% for 5
s after the following conditions are met, the PCM determines that there is a TP
sensor circuit range/performance problem.
MONITORING CONDITION